uboot指令笔记

​ Linux的移植要复杂的多，在移植 Linux之前我们需要先移植一个 bootloader代码，这个 bootloader代码用于启动 Linux内核，bootloader有很多，常用的就是 U-Boot。

​ 移植好 U-Boot以后再移植 Linux内核，移植完 Linux内核以后Linux还不能正常启动。

​ 还需要再移植一个根文件系统(rootfs)，根文件系统里面包含了一些最常用的命令和文件。

​ 所以 U-Boot、Linux kernel和 rootfs这三者一起构成了一个完整的 Linux系统

1.u-boot

1.1 u-boot是啥

​ Linux系统要启动就必须需要一个 bootloader程序，也就说芯片上电以后先运行一段bootloader程序。

​ 这段 bootloader程序会先初始化 DDR等外设，然后将 Linux内核从 flash(NAND，NOR FLASH，SD，MMC等)拷贝到 DDR中，最后启动 Linux内核。

​ 它最主要的工作就是启动 Linux内核，bootloader和 Linux内核的关系就跟 PC上的 BIOS和 Windows的关系一样，bootloader就相当于 BIOS。

sudo apt-get install libncurses5-dev 
tar -vxjf uboot-imx-2016.03-2.1.0-g8b546e4.tar.bz2  //解压文件
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mx6ull_alientek_emmc.sh

使用chmod 777给shell脚本权限，在执行./mx6ull_alientek_emmc.sh脚本文件来重新编译uboot

#！/bin/bash
//sheel脚本第一行必须是"#!/bin/bash"或者"#!/bin/sh"

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- distclean 
// ARCH=arm设置目标为arm架构  CROSS_COMPILE用于指定所使用的交叉编译器
// 这里等效于指令make distclean，目的是清除工程，建议在第一次使用时清理一下工程

make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- mx6ull_14x14_ddr512_emmc_defconfig 
// make mx6ull_14x14_ddr512_emmc_defconfig  
// 用于配置uboot，配置文件为 mx6ull_14x14_ddr512_emmc_defconfig 
// 编译uboot时候根据自己的需求去配置uboot，支持USB 网络 SD卡等。
// 在uboot中，可以通过make XXX_defconfig 来配置uboot，这个就是不同板子的配置文件，都在uboot/configs中

make V=1 ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- -j12 
// V=1 用于设置编译过程的信息输出级别
// make -j12  使用12核来编译uboot，用于设置主机使用多少线程来编译uboot，最好设计成虚拟机的核心数
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U-Boot烧写和启动

chmod 777 imxdownload 
./imxdownload u-boot.bin /dev/sdb
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​ 烧写完成插到开发板上，BOOT设置成从SD卡打开，使用USB连接USB_TTL和电脑，将开发板的串口1连接到电脑上，使用MobaXterm设置好串口参数打开，最后复位开发板。

​ 在MobaXterm出现**“Hit any key to stop autoboot: ”**倒计时的时候，按下键盘上的回车键，默认是 3秒倒计时。

​ 在 3秒倒计时结束如果没有按下回车键的话 uboot就会使用默认参数来启动 Linux内核。

​ 如果在 3秒倒计时结束之前按下回车键，那么就会进入 uboot命令行模式。

U-Boot 2016.03 (Nov 08 2022 - 06:25:27 -0800)              
//uboot版本号2016.03和编译时间2022.11.8

CPU:   Freescale i.MX6ULL rev1.1 792 MHz (running at 396 MHz)  
//CPU是飞思卡尔(被NXP收购)I.MX6ULL 频率是792MHz，当前运行在396MHz

CPU:   Industrial temperature grade (-40C to 105C) at 36C
// 工业级芯片，温度为-40度到105度

Reset cause: POR
// 复位原因，当前的复位原因是POR，芯片有一个POR_B引脚，将这个引脚拉低即可复位I.MX6ULL

Board: I.MX6U ALPHA|MINI
// 当前板子名字

I2C:   ready
// I2C准备就绪

DRAM:  512 MiB
// DRAM内存为512MB，这是EMMC的版本

MMC:   FSL_SDHC: 0, FSL_SDHC: 1
// 当前有两个MMC/SD卡控制器FSL_SDHC0和FSL_SDHC1了，板卡上FSL_SDHC0接的SD(TF)卡，FSL_SDHC1接的EMMC.

*** Warning - bad CRC, using default environment
Display: ATK-LCD-7-1024x600 (1024x600) 
11 Video: 1024x600x24 
// 没接LCD会显示第一行报错，当前的LCD型号是ATK-LCD-7-1024x600 (1024x600),格式为RGB888

In:    serial
Out:   serial
Err:   serial
// 标准输入，标准输出和标准错误所使用的终端，这里都是使用串口来作为终端

switch to partitions #0, OK
mmc0 is current device
// 切换到emmc的第0个分区，当前u-boot是emmc版本，从emmc启动，为了方便烧写到SD卡，本质还是EMMC的。这里将EMMC作为默认存储器，也可以将SD卡来作为uboot的存储器。

Net:   FEC1
Error: FEC1 address not set.
// 使用FEC1网口，一共有两个网口，并提示FEC1网络地址没有设置。

Normal Boot
// 正常启动，uboot要从emmc里面读取环境变量和参数信息来启动linux内核。
Hit any key to stop autoboot:  0
=>
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1.2 u-boot常用命令

网络连接设置

更新EMMC的uboot

mmc dev 1 0                //切换到 EMMC分区 0 
tftp 80800000 u-boot.imx   //下载 u-boot.imx到 DRAM 
mmc write 80800000 2 32E   //烧写 u-boot.imx到 EMMC中 ，不能将imx写入到SD卡或者EMMC的前两个块，里面保存分区表
mmc partconf 1 1 0 0       //分区配置，EMMC需要这一步！
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更新EMMC的linux镜像

tftp 80800000 zImage                      //下载zImage到 DRAM 
fatwrite mmc 1:1 80800000 zImage 6788f8   //emmc的1区存放linux镜像，这里的6788f8是字节的数目
fatls mmc  1:1                            //查看emmc的分区1
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1.3 顶层Makefile（完全没有看懂）

Makefile

#
# SPDX-License-Identifier:	GPL-2.0+
#

VERSION = 2016  #主版本号
PATCHLEVEL = 03 #补丁版本号                  
SUBLEVEL =      #次版本号
EXTRAVERSION =  #附加版本信息
NAME =          #名字

# *DOCUMENTATION*
# To see a list of typical targets execute "make help"
# More info can be located in ./README
# Comments in this file are targeted only to the developer, do not
# expect to learn how to build the kernel reading this file.

# o Do not use make's built-in rules and variables
#   (this increases performance and avoids hard-to-debug behaviour);
# o Look for make include files relative to root of kernel src
MAKEFLAGS += -rR --include-dir=$(CURDIR)
# -rR表示禁止使用内置的隐含规则和变量定义
# --include-dir 指明搜索路径
# $(CURDIR) 表示当前目录

# $(MAKE) -C subdir  调用make命令指定子目录
# export VARIABLE ...导出变量给子make
# unexport VARIABLE ...不导出变量给子make
# SHELL 和 MAKEFLAGS 除非使用unexport声明。否则的话在make执行中始终传递给子make

# Avoid funny character set dependencies
unexport LC_ALL
LC_COLLATE=C
LC_NUMERIC=C
export LC_COLLATE LC_NUMERIC

# Avoid interference with shell env settings
unexport GREP_OPTIONS

# We are using a recursive build, so we need to do a little thinking
# to get the ordering right.
#
# Most importantly: sub-Makefiles should only ever modify files in
# their own directory. If in some directory we have a dependency on
# a file in another dir (which doesn't happen often, but it's often
# unavoidable when linking the built-in.o targets which finally
# turn into vmlinux), we will call a sub make in that other dir, and
# after that we are sure that everything which is in that other dir
# is now up to date.
#
# The only cases where we need to modify files which have global
# effects are thus separated out and done before the recursive
# descending is started. They are now explicitly listed as the
# prepare rule.

# Beautify output
# ---------------------------------------------------------------------------
#
# Normally, we echo the whole command before executing it. By making
# that echo $($(quiet)$(cmd)), we now have the possibility to set
# $(quiet) to choose other forms of output instead, e.g.
#
#         quiet_cmd_cc_o_c = Compiling $(RELDIR)/$@
#         cmd_cc_o_c       = $(CC) $(c_flags) -c -o $@ $<
#
# If $(quiet) is empty, the whole command will be printed.
# If it is set to "quiet_", only the short version will be printed.
# If it is set to "silent_", nothing will be printed at all, since
# the variable $(silent_cmd_cc_o_c) doesn't exist.
#
# A simple variant is to prefix commands with $(Q) - that's useful
# for commands that shall be hidden in non-verbose mode.
#
#	$(Q)ln $@ :<
#
# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
# If KBUILD_VERBOSE equals 1 then the above command is displayed.
#
# To put more focus on warnings, be less verbose as default
# Use 'make V=1' to see the full commands

# uboot默认编译时v=0，在make前面加上@，不会在终端显示完整的命令，都是短命令
# 使用 V = 1来是实现完整的命令输出，在调试的时候很有用
ifeq ("$(origin V)", "command line")
  # $(origin ) 返回变量variable的变量来源，是命令行来的就来自"command line"
  KBUILD_VERBOSE = $(V)  #输入 V = 1， 这个时候KBUILD_VERBOSE的数值就是1
endif
ifndef KBUILD_VERBOSE
  KBUILD_VERBOSE = 0     #没有在命令行输入V的数值，那么就有KBUILD_VERBOSE的数值就是0
endif

ifeq ($(KBUILD_VERBOSE),1)
  quiet =
  Q =
else
  quiet=quiet_
  Q = @
endif
# Makefile会使用quiet和Q来控制编译的时候是否在终端输出完整的命令
# $(Q)$(MAKE)$(build)=tools
# 如果V=0, @make $(build)=tools，make在执行会默认终端输出命令，加@不会在终端输出命令
# 如果V=1，就是make $(build)=tools，此时命令就会完整的输出在终端

# 如果变量quiet为空的时候，整个命令都会输出            cmd_xxx
# 如果变量quiet为"quiet_"的话，仅输出短版本           quiet_cmd_xxx
# 如果变量quiet为"silent_"的话，整个命令都不会输出    silent_cmd_xxx


# If the user is running make -s (silent mode), suppress echoing of
# commands
# make -s 实现静默输出

ifneq ($(filter 4.%,$(MAKE_VERSION)),)	# make-4
# $(filter,),以pattern模式过滤text字符串中的单词  %为通配符
ifneq ($(filter %s ,$(firstword x$(MAKEFLAGS))),)
# $(firstword) 用于取出text字符串中的第一个单词
# MAKEFLAGS的第一个单词时xrRs
  quiet=silent_
endif
else					# make-3.8x
ifneq ($(filter s% -s%,$(MAKEFLAGS)),)
  quiet=silent_
endif
endif

export quiet Q KBUILD_VERBOSE
# make O=out 设置目标文件输出到out目录中
# kbuild supports saving output files in a separate directory.
# To locate output files in a separate directory two syntaxes are supported.
# In both cases the working directory must be the root of the kernel src.
# 1) O=
# Use "make O=dir/to/store/output/files/"
#
# 2) Set KBUILD_OUTPUT
# Set the environment variable KBUILD_OUTPUT to point to the directory
# where the output files shall be placed.
# export KBUILD_OUTPUT=dir/to/store/output/files/
# make
#
# The O= assignment takes precedence over the KBUILD_OUTPUT environment
# variable.

# KBUILD_SRC is set on invocation of make in OBJ directory
# KBUILD_SRC is not intended to be used by the regular user (for now)
ifeq ($(KBUILD_SRC),)

# OK, Make called in directory where kernel src resides
# Do we want to locate output files in a separate directory?
ifeq ("$(origin O)", "command line")
  KBUILD_OUTPUT := $(O)
endif

# That's our default target when none is given on the command line
PHONY := _all
_all:

# Cancel implicit rules on top Makefile
$(CURDIR)/Makefile Makefile: ;

ifneq ($(KBUILD_OUTPUT),)
# Invoke a second make in the output directory, passing relevant variables
# check that the output directory actually exists
saved-output := $(KBUILD_OUTPUT)
KBUILD_OUTPUT := $(shell mkdir -p $(KBUILD_OUTPUT) && cd $(KBUILD_OUTPUT) \
								&& /bin/pwd)
$(if $(KBUILD_OUTPUT),, \
     $(error failed to create output directory "$(saved-output)"))

PHONY += $(MAKECMDGOALS) sub-make

$(filter-out _all sub-make $(CURDIR)/Makefile, $(MAKECMDGOALS)) _all: sub-make
	@:

sub-make: FORCE
	$(Q)$(MAKE) -C $(KBUILD_OUTPUT) KBUILD_SRC=$(CURDIR) \
	-f $(CURDIR)/Makefile $(filter-out _all sub-make,$(MAKECMDGOALS))

# Leave processing to above invocation of make
skip-makefile := 1
endif # ifneq ($(KBUILD_OUTPUT),)
endif # ifeq ($(KBUILD_SRC),)

# We process the rest of the Makefile if this is the final invocation of make
ifeq ($(skip-makefile),)

# Do not print "Entering directory ...",
# but we want to display it when entering to the output directory
# so that IDEs/editors are able to understand relative filenames.
MAKEFLAGS += --no-print-directory

# make C=1 使能代码检查
# make C=2 用于检查所有的源码文件

# Call a source code checker (by default, "sparse") as part of the
# C compilation.
#
# Use 'make C=1' to enable checking of only re-compiled files.
# Use 'make C=2' to enable checking of *all* source files, regardless
# of whether they are re-compiled or not.
#
# See the file "Documentation/sparse.txt" for more details, including
# where to get the "sparse" utility.

ifeq ("$(origin C)", "command line")
  KBUILD_CHECKSRC = $(C)
endif
ifndef KBUILD_CHECKSRC
  KBUILD_CHECKSRC = 0
endif

# 允许单独编译某个模块 make M=dir 
# Use make M=dir to specify directory of external module to build
# Old syntax make ... SUBDIRS=$PWD is still supported
# Setting the environment variable KBUILD_EXTMOD take precedence
ifdef SUBDIRS
  KBUILD_EXTMOD ?= $(SUBDIRS)
endif
# 支持老语法 make SUBDIRS = dir

ifeq ("$(origin M)", "command line")
  KBUILD_EXTMOD := $(M)
endif

# If building an external module we do not care about the all: rule
# but instead _all depend on modules
PHONY += all
ifeq ($(KBUILD_EXTMOD),)
_all: all          #为空的时候，目标_all依赖于all
else
_all: modules      #不为空的话。就去编译特定的模块
endif

ifeq ($(KBUILD_SRC),)
        # building in the source tree
        srctree := .
else
        ifeq ($(KBUILD_SRC)/,$(dir $(CURDIR)))
                # building in a subdirectory of the source tree
                srctree := ..
        else
                srctree := $(KBUILD_SRC)
        endif
endif
objtree		:= .
src		:= $(srctree)   #当前目录
obj		:= $(objtree)   #当前目录

VPATH		:= $(srctree)$(if $(KBUILD_EXTMOD),:$(KBUILD_EXTMOD))

export srctree objtree VPATH

# Make sure CDPATH settings don't interfere
unexport CDPATH

#########################################################################
# Makefile获取主机架构和系统，也就是我们电脑的架构和系统
HOSTARCH := $(shell uname -m | \
	sed -e s/i.86/x86/ \
	    -e s/sun4u/sparc64/ \
	    -e s/arm.*/arm/ \
	    -e s/sa110/arm/ \
	    -e s/ppc64/powerpc/ \
	    -e s/ppc/powerpc/ \
	    -e s/macppc/powerpc/\
	    -e s/sh.*/sh/)
# HOSTARCH用于保存主机架构，调用uname-m 为x86_64
# |是将左边的输出作为右边的输入
# sed -e s/i.86/x86/    sed -e s将输入的i.86替换为x86

HOSTOS := $(shell uname -s | tr '[:upper:]' '[:lower:]' | \
	    sed -e 's/\(cygwin\).*/cygwin/')
# 用于保存主机OS的值，使用uname -s来获取主机os
# uname -s 为linux
# 将"Linux"作为后面tr '[:upper:]' '[:lower:]'的输入，tr '[:upper:]' '[:lower:]'表示将所有的大写字母替换为小写字母，最后得到linux
# 将linux作为 sed -e 's/\(cygwin\).*/cygwin/' 的输入，用于将cygwin.* 替换为cygwin

# HOSTARCH=x86_64，HOSTOS=linux

export	HOSTARCH HOSTOS

#########################################################################
# 设置ARCH 和CROSS_COMPILE

# set default to nothing for native builds
ifeq ($(HOSTARCH),$(ARCH))  
# HOSTARCH是x86_64 ARCH是ARM
CROSS_COMPILE ?=
endif

# ARCH ?= arm
# CROSS_COMPILE ?= arm-linux-gnueabihf-

KCONFIG_CONFIG	?= .config
# 设置配置文件为.config，默认是没有的，使用命令 make xxx_defconfig对uboot进行配置
# xxx_defconfig只是一些初始配置，而.config里面的才是实时有效的配置
export KCONFIG_CONFIG

# SHELL used by kbuild
CONFIG_SHELL := $(shell if [ -x "$$BASH" ]; then echo $$BASH; \
	  else if [ -x /bin/bash ]; then echo /bin/bash; \
	  else echo sh; fi ; fi)

HOSTCC       = cc
HOSTCXX      = c++
HOSTCFLAGS   = -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer
HOSTCXXFLAGS = -O2

ifeq ($(HOSTOS),cygwin)
HOSTCFLAGS	+= -ansi
endif

# Mac OS X / Darwin's C preprocessor is Apple specific.  It
# generates numerous errors and warnings.  We want to bypass it
# and use GNU C's cpp.	To do this we pass the -traditional-cpp
# option to the compiler.  Note that the -traditional-cpp flag
# DOES NOT have the same semantics as GNU C's flag, all it does
# is invoke the GNU preprocessor in stock ANSI/ISO C fashion.
#
# Apple's linker is similar, thanks to the new 2 stage linking
# multiple symbol definitions are treated as errors, hence the
# -multiply_defined suppress option to turn off this error.
#
ifeq ($(HOSTOS),darwin)
# get major and minor product version (e.g. '10' and '6' for Snow Leopard)
DARWIN_MAJOR_VERSION	= $(shell sw_vers -productVersion | cut -f 1 -d '.')
DARWIN_MINOR_VERSION	= $(shell sw_vers -productVersion | cut -f 2 -d '.')

os_x_before	= $(shell if [ $(DARWIN_MAJOR_VERSION) -le $(1) -a \
	$(DARWIN_MINOR_VERSION) -le $(2) ] ; then echo "$(3)"; else echo "$(4)"; fi ;)

# Snow Leopards build environment has no longer restrictions as described above
HOSTCC       = $(call os_x_before, 10, 5, "cc", "gcc")
HOSTCFLAGS  += $(call os_x_before, 10, 4, "-traditional-cpp")
HOSTLDFLAGS += $(call os_x_before, 10, 5, "-multiply_defined suppress")

# since Lion (10.7) ASLR is on by default, but we use linker generated lists
# in some host tools which is a problem then ... so disable ASLR for these
# tools
HOSTLDFLAGS += $(call os_x_before, 10, 7, "", "-Xlinker -no_pie")
endif

# Decide whether to build built-in, modular, or both.
# Normally, just do built-in.

KBUILD_MODULES :=
KBUILD_BUILTIN := 1

# If we have only "make modules", don't compile built-in objects.
# When we're building modules with modversions, we need to consider
# the built-in objects during the descend as well, in order to
# make sure the checksums are up to date before we record them.

ifeq ($(MAKECMDGOALS),modules)
  KBUILD_BUILTIN := $(if $(CONFIG_MODVERSIONS),1)
endif

# If we have "make  modules", compile modules
# in addition to whatever we do anyway.
# Just "make" or "make all" shall build modules as well

# U-Boot does not need modules
#ifneq ($(filter all _all modules,$(MAKECMDGOALS)),)
#  KBUILD_MODULES := 1
#endif

#ifeq ($(MAKECMDGOALS),)
#  KBUILD_MODULES := 1
#endif

export KBUILD_MODULES KBUILD_BUILTIN
export KBUILD_CHECKSRC KBUILD_SRC KBUILD_EXTMOD

# 调用scripts/Kbuild.include 这个文件，这个里面有很多变量
# We need some generic definitions (do not try to remake the file).
scripts/Kbuild.include: ;
include scripts/Kbuild.include

# 交叉编译工具变量设置
# Make variables (CC, etc...)

AS		= $(CROSS_COMPILE)as
# Always use GNU ld
ifneq ($(shell $(CROSS_COMPILE)ld.bfd -v 2> /dev/null),)
LD		= $(CROSS_COMPILE)ld.bfd
else
LD		= $(CROSS_COMPILE)ld
endif
CC		= $(CROSS_COMPILE)gcc
CPP		= $(CC) -E
AR		= $(CROSS_COMPILE)ar
NM		= $(CROSS_COMPILE)nm
LDR		= $(CROSS_COMPILE)ldr
STRIP		= $(CROSS_COMPILE)strip
OBJCOPY		= $(CROSS_COMPILE)objcopy
OBJDUMP		= $(CROSS_COMPILE)objdump
AWK		= awk
PERL		= perl
PYTHON		= python
DTC		= dtc
CHECK		= sparse

CHECKFLAGS     := -D__linux__ -Dlinux -D__STDC__ -Dunix -D__unix__ \
		  -Wbitwise -Wno-return-void -D__CHECK_ENDIAN__ $(CF)

KBUILD_CPPFLAGS := -D__KERNEL__ -D__UBOOT__

KBUILD_CFLAGS   := -Wall -Wstrict-prototypes \
		   -Wno-format-security \
		   -fno-builtin -ffreestanding
KBUILD_AFLAGS   := -D__ASSEMBLY__

# Read UBOOTRELEASE from include/config/uboot.release (if it exists)
UBOOTRELEASE = $(shell cat include/config/uboot.release 2> /dev/null)
UBOOTVERSION = $(VERSION)$(if $(PATCHLEVEL),.$(PATCHLEVEL)$(if $(SUBLEVEL),.$(SUBLEVEL)))$(EXTRAVERSION)

# 导出很多变量
export VERSION PATCHLEVEL SUBLEVEL UBOOTRELEASE UBOOTVERSION
export ARCH CPU BOARD VENDOR SOC CPUDIR BOARDDIR
# 这7个变量在其他文件里面定义的，在config.mk中定义的
# ARCH = arm 
# CPU = armv7 
# BOARD = mx6ullevk 
# VENDOR = freescale 
# SOC = mx6 
# CPUDIR = arch/arm/cpu/armv7 
# BOARDDIR = freescale/mx6ullevk 

export CONFIG_SHELL HOSTCC HOSTCFLAGS HOSTLDFLAGS CROSS_COMPILE AS LD CC
export CPP AR NM LDR STRIP OBJCOPY OBJDUMP
export MAKE AWK PERL PYTHON
export HOSTCXX HOSTCXXFLAGS DTC CHECK CHECKFLAGS

export KBUILD_CPPFLAGS NOSTDINC_FLAGS UBOOTINCLUDE OBJCOPYFLAGS LDFLAGS
export KBUILD_CFLAGS KBUILD_AFLAGS

# When compiling out-of-tree modules, put MODVERDIR in the module
# tree rather than in the kernel tree. The kernel tree might
# even be read-only.
export MODVERDIR := $(if $(KBUILD_EXTMOD),$(firstword $(KBUILD_EXTMOD))/).tmp_versions

# Files to ignore in find ... statements

export RCS_FIND_IGNORE := \( -name SCCS -o -name BitKeeper -o -name .svn -o    \
			  -name CVS -o -name .pc -o -name .hg -o -name .git \) \
			  -prune -o
export RCS_TAR_IGNORE := --exclude SCCS --exclude BitKeeper --exclude .svn \
			 --exclude CVS --exclude .pc --exclude .hg --exclude .git

# ===========================================================================
# Rules shared between *config targets and build targets

# Basic helpers built in scripts/
PHONY += scripts_basic
scripts_basic:
	$(Q)$(MAKE) $(build)=scripts/basic
	$(Q)rm -f .tmp_quiet_recordmcount

# To avoid any implicit rule to kick in, define an empty command.
scripts/basic/%: scripts_basic ;

PHONY += outputmakefile
# outputmakefile generates a Makefile in the output directory, if using a
# separate output directory. This allows convenient use of make in the
# output directory.
outputmakefile:
ifneq ($(KBUILD_SRC),)
	$(Q)ln -fsn $(srctree) source
	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/mkmakefile \
	    $(srctree) $(objtree) $(VERSION) $(PATCHLEVEL)
endif


# make xxx_defconfig命令来配置uboot
# To make sure we do not include .config for any of the *config targets
# catch them early, and hand them over to scripts/kconfig/Makefile
# It is allowed to specify more targets when calling make, including
# mixing *config targets and build targets.
# For example 'make oldconfig all'.
# Detect when mixed targets is specified, and make a second invocation
# of make so .config is not included in this case either (for *config).

version_h := include/generated/version_autogenerated.h
# 保存版本号文件，这个文件是自动生成的
timestamp_h := include/generated/timestamp_autogenerated.h
# 保存时间戳文件

no-dot-config-targets := clean clobber mrproper distclean \
			 help %docs check% coccicheck \
			 ubootversion backup

config-targets := 0
mixed-targets  := 0
dot-config     := 1

ifneq ($(filter $(no-dot-config-targets), $(MAKECMDGOALS)),)
	ifeq ($(filter-out $(no-dot-config-targets), $(MAKECMDGOALS)),)
		dot-config := 0
	endif
endif
# 将 MAKECMDGOALS中不符合 no-dot-config-targets的部分过滤掉，剩下的如果不为空的话条件就成立。MAKECMDGOALS是 make的一个环境变量，这个变量会保存你所指定的终极目标列表，比如执行“make mx6ull_alientek_emmc_defconfig” ，那么 MAKECMDGOALS就为 mx6ull_alientek_emmc_defconfig。很明显过滤后为空，所以条件不成立，变量 dot-config依旧为 1。 

ifeq ($(KBUILD_EXTMOD),)
        ifneq ($(filter config %config,$(MAKECMDGOALS)),)
                config-targets := 1
                ifneq ($(words $(MAKECMDGOALS)),1)
                # 使用words来统计单词个数
                        mixed-targets := 1
                endif
        endif
endif

ifeq ($(mixed-targets),1)
# ===========================================================================
# We're called with mixed targets (*config and build targets).
# Handle them one by one.

PHONY += $(MAKECMDGOALS) __build_one_by_one

$(filter-out __build_one_by_one, $(MAKECMDGOALS)): __build_one_by_one
	@:

__build_one_by_one:
	$(Q)set -e; \
	for i in $(MAKECMDGOALS); do \
		$(MAKE) -f $(srctree)/Makefile $$i; \
	done

else
ifeq ($(config-targets),1)
# ===========================================================================
# *config targets only - make sure prerequisites are updated, and descend
# in scripts/kconfig to make the *config target

KBUILD_DEFCONFIG := sandbox_defconfig
export KBUILD_DEFCONFIG KBUILD_KCONFIG

config: scripts_basic outputmakefile FORCE
	$(Q)$(MAKE) $(build)=scripts/kconfig $@

%config: scripts_basic outputmakefile FORCE
	$(Q)$(MAKE) $(build)=scripts/kconfig $@

else
# ===========================================================================
# Build targets only - this includes vmlinux, arch specific targets, clean
# targets and others. In general all targets except *config targets.

ifeq ($(dot-config),1)
# Read in config
-include include/config/auto.conf

# Read in dependencies to all Kconfig* files, make sure to run
# oldconfig if changes are detected.
-include include/config/auto.conf.cmd

# To avoid any implicit rule to kick in, define an empty command
$(KCONFIG_CONFIG) include/config/auto.conf.cmd: ;

# If .config is newer than include/config/auto.conf, someone tinkered
# with it and forgot to run make oldconfig.
# if auto.conf.cmd is missing then we are probably in a cleaned tree so
# we execute the config step to be sure to catch updated Kconfig files
include/config/%.conf: $(KCONFIG_CONFIG) include/config/auto.conf.cmd
	$(Q)$(MAKE) -f $(srctree)/Makefile silentoldconfig
	@# If the following part fails, include/config/auto.conf should be
	@# deleted so "make silentoldconfig" will be re-run on the next build.
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.autoconf || \
		{ rm -f include/config/auto.conf; false; }
	@# include/config.h has been updated after "make silentoldconfig".
	@# We need to touch include/config/auto.conf so it gets newer
	@# than include/config.h.
	@# Otherwise, 'make silentoldconfig' would be invoked twice.
	$(Q)touch include/config/auto.conf

-include include/autoconf.mk
-include include/autoconf.mk.dep

# We want to include arch/$(ARCH)/config.mk only when include/config/auto.conf
# is up-to-date. When we switch to a different board configuration, old CONFIG
# macros are still remaining in include/config/auto.conf. Without the following
# gimmick, wrong config.mk would be included leading nasty warnings/errors.
ifneq ($(wildcard $(KCONFIG_CONFIG)),)
ifneq ($(wildcard include/config/auto.conf),)
autoconf_is_old := $(shell find . -path ./$(KCONFIG_CONFIG) -newer \
						include/config/auto.conf)
ifeq ($(autoconf_is_old),)
include config.mk
include arch/$(ARCH)/Makefile
endif
endif
endif

# If board code explicitly specified LDSCRIPT or CONFIG_SYS_LDSCRIPT, use
# that (or fail if absent).  Otherwise, search for a linker script in a
# standard location.

ifndef LDSCRIPT
	#LDSCRIPT := $(srctree)/board/$(BOARDDIR)/u-boot.lds.debug
	ifdef CONFIG_SYS_LDSCRIPT
		# need to strip off double quotes
		LDSCRIPT := $(srctree)/$(CONFIG_SYS_LDSCRIPT:"%"=%)
	endif
endif

# If there is no specified link script, we look in a number of places for it
ifndef LDSCRIPT
	ifeq ($(wildcard $(LDSCRIPT)),)
		LDSCRIPT := $(srctree)/board/$(BOARDDIR)/u-boot.lds
	endif
	ifeq ($(wildcard $(LDSCRIPT)),)
		LDSCRIPT := $(srctree)/$(CPUDIR)/u-boot.lds
	endif
	ifeq ($(wildcard $(LDSCRIPT)),)
		LDSCRIPT := $(srctree)/arch/$(ARCH)/cpu/u-boot.lds
	endif
endif

else
# Dummy target needed, because used as prerequisite
include/config/auto.conf: ;
endif # $(dot-config)

ifdef CONFIG_CC_OPTIMIZE_FOR_SIZE
KBUILD_CFLAGS	+= -Os
else
KBUILD_CFLAGS	+= -O2
endif

KBUILD_CFLAGS += $(call cc-option,-fno-stack-protector)
KBUILD_CFLAGS += $(call cc-option,-fno-delete-null-pointer-checks)

KBUILD_CFLAGS	+= -g
# $(KBUILD_AFLAGS) sets -g, which causes gcc to pass a suitable -g
# option to the assembler.
KBUILD_AFLAGS	+= -g

# Report stack usage if supported
ifeq ($(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-stack-usage.sh $(CC)),y)
	KBUILD_CFLAGS += -fstack-usage
endif

KBUILD_CFLAGS += $(call cc-option,-Wno-format-nonliteral)

# turn jbsr into jsr for m68k
ifeq ($(ARCH),m68k)
ifeq ($(findstring 3.4,$(shell $(CC) --version)),3.4)
KBUILD_AFLAGS += -Wa,-gstabs,-S
endif
endif

# Prohibit date/time macros, which would make the build non-deterministic
KBUILD_CFLAGS   += $(call cc-option,-Werror=date-time)

include scripts/Makefile.extrawarn

# Add user supplied CPPFLAGS, AFLAGS and CFLAGS as the last assignments
KBUILD_CPPFLAGS += $(KCPPFLAGS)
KBUILD_AFLAGS += $(KAFLAGS)
KBUILD_CFLAGS += $(KCFLAGS)

# Use UBOOTINCLUDE when you must reference the include/ directory.
# Needed to be compatible with the O= option
UBOOTINCLUDE    := \
		-Iinclude \
		$(if $(KBUILD_SRC), -I$(srctree)/include) \
		$(if $(CONFIG_SYS_THUMB_BUILD), $(if $(CONFIG_HAS_THUMB2),, \
			-I$(srctree)/arch/$(ARCH)/thumb1/include),) \
		-I$(srctree)/arch/$(ARCH)/include \
		-include $(srctree)/include/linux/kconfig.h

NOSTDINC_FLAGS += -nostdinc -isystem $(shell $(CC) -print-file-name=include)
CHECKFLAGS     += $(NOSTDINC_FLAGS)

# FIX ME
cpp_flags := $(KBUILD_CPPFLAGS) $(PLATFORM_CPPFLAGS) $(UBOOTINCLUDE) \
							$(NOSTDINC_FLAGS)
c_flags := $(KBUILD_CFLAGS) $(cpp_flags)

#########################################################################
# U-Boot objects....order is important (i.e. start must be first)

HAVE_VENDOR_COMMON_LIB = $(if $(wildcard $(srctree)/board/$(VENDOR)/common/Makefile),y,n)

libs-y += lib/
libs-$(HAVE_VENDOR_COMMON_LIB) += board/$(VENDOR)/common/
libs-$(CONFIG_OF_EMBED) += dts/
libs-y += fs/
libs-y += net/
libs-y += disk/
libs-y += drivers/
libs-y += drivers/dma/
libs-y += drivers/gpio/
libs-y += drivers/i2c/
libs-y += drivers/mmc/
libs-y += drivers/mtd/
libs-$(CONFIG_CMD_NAND) += drivers/mtd/nand/
libs-y += drivers/mtd/onenand/
libs-$(CONFIG_CMD_UBI) += drivers/mtd/ubi/
libs-y += drivers/mtd/spi/
libs-y += drivers/net/
libs-y += drivers/net/phy/
libs-y += drivers/pci/
libs-y += drivers/power/ \
	drivers/power/fuel_gauge/ \
	drivers/power/mfd/ \
	drivers/power/pmic/ \
	drivers/power/battery/ \
	drivers/power/regulator/
libs-y += drivers/spi/
libs-$(CONFIG_FMAN_ENET) += drivers/net/fm/
libs-$(CONFIG_SYS_FSL_DDR) += drivers/ddr/fsl/
libs-$(CONFIG_ALTERA_SDRAM) += drivers/ddr/altera/
libs-y += drivers/serial/
libs-y += drivers/usb/dwc3/
libs-y += drivers/usb/emul/
libs-y += drivers/usb/eth/
libs-y += drivers/usb/gadget/
libs-y += drivers/usb/gadget/udc/
libs-y += drivers/usb/host/
libs-y += drivers/usb/musb/
libs-y += drivers/usb/musb-new/
libs-y += drivers/usb/phy/
libs-y += drivers/usb/ulpi/
libs-y += cmd/
libs-y += common/
libs-$(CONFIG_API) += api/
libs-$(CONFIG_HAS_POST) += post/
libs-y += test/
libs-y += test/dm/
libs-$(CONFIG_UT_ENV) += test/env/

libs-y += $(if $(BOARDDIR),board/$(BOARDDIR)/)

libs-y := $(sort $(libs-y))

u-boot-dirs	:= $(patsubst %/,%,$(filter %/, $(libs-y))) tools examples

u-boot-alldirs	:= $(sort $(u-boot-dirs) $(patsubst %/,%,$(filter %/, $(libs-))))

libs-y		:= $(patsubst %/, %/built-in.o, $(libs-y))

u-boot-init := $(head-y)
u-boot-main := $(libs-y)


# Add GCC lib
ifeq ($(CONFIG_USE_PRIVATE_LIBGCC),y)
PLATFORM_LIBGCC = arch/$(ARCH)/lib/lib.a
else
PLATFORM_LIBGCC := -L $(shell dirname `$(CC) $(c_flags) -print-libgcc-file-name`) -lgcc
endif
PLATFORM_LIBS += $(PLATFORM_LIBGCC)
export PLATFORM_LIBS
export PLATFORM_LIBGCC

# Special flags for CPP when processing the linker script.
# Pass the version down so we can handle backwards compatibility
# on the fly.
LDPPFLAGS += \
	-include $(srctree)/include/u-boot/u-boot.lds.h \
	-DCPUDIR=$(CPUDIR) \
	$(shell $(LD) --version | \
	  sed -ne 's/GNU ld version \([0-9][0-9]*\)\.\([0-9][0-9]*\).*/-DLD_MAJOR=\1 -DLD_MINOR=\2/p')

#########################################################################
#########################################################################

ifneq ($(CONFIG_BOARD_SIZE_LIMIT),)
BOARD_SIZE_CHECK = \
	@actual=`wc -c $@ | awk '{print $$1}'`; \
	limit=`printf "%d" $(CONFIG_BOARD_SIZE_LIMIT)`; \
	if test $$actual -gt $$limit; then \
		echo "$@ exceeds file size limit:" >&2 ; \
		echo "  limit:  $$limit bytes" >&2 ; \
		echo "  actual: $$actual bytes" >&2 ; \
		echo "  excess: $$((actual - limit)) bytes" >&2; \
		exit 1; \
	fi
else
BOARD_SIZE_CHECK =
endif

# Statically apply RELA-style relocations (currently arm64 only)
ifneq ($(CONFIG_STATIC_RELA),)
# $(1) is u-boot ELF, $(2) is u-boot bin, $(3) is text base
DO_STATIC_RELA = \
	start=$$($(NM) $(1) | grep __rel_dyn_start | cut -f 1 -d ' '); \
	end=$$($(NM) $(1) | grep __rel_dyn_end | cut -f 1 -d ' '); \
	tools/relocate-rela $(2) $(3) $$start $$end
else
DO_STATIC_RELA =
endif

# Always append ALL so that arch config.mk's can add custom ones
ALL-y += u-boot.srec u-boot.bin u-boot.sym System.map u-boot.cfg binary_size_check

ALL-$(CONFIG_ONENAND_U_BOOT) += u-boot-onenand.bin
ifeq ($(CONFIG_SPL_FSL_PBL),y)
ALL-$(CONFIG_RAMBOOT_PBL) += u-boot-with-spl-pbl.bin
else
ifneq ($(CONFIG_SECURE_BOOT), y)
# For Secure Boot The Image needs to be signed and Header must also
# be included. So The image has to be built explicitly
ALL-$(CONFIG_RAMBOOT_PBL) += u-boot.pbl
endif
endif
ALL-$(CONFIG_SPL) += spl/u-boot-spl.bin
ALL-$(CONFIG_SPL_FRAMEWORK) += u-boot.img
ALL-$(CONFIG_TPL) += tpl/u-boot-tpl.bin
ALL-$(CONFIG_OF_SEPARATE) += u-boot.dtb
ifeq ($(CONFIG_SPL_FRAMEWORK),y)
ALL-$(CONFIG_OF_SEPARATE) += u-boot-dtb.img
endif
ALL-$(CONFIG_OF_HOSTFILE) += u-boot.dtb
ifneq ($(CONFIG_SPL_TARGET),)
ALL-$(CONFIG_SPL) += $(CONFIG_SPL_TARGET:"%"=%)
endif
ALL-$(CONFIG_REMAKE_ELF) += u-boot.elf
ALL-$(CONFIG_EFI_APP) += u-boot-app.efi
ALL-$(CONFIG_EFI_STUB) += u-boot-payload.efi

ifneq ($(BUILD_ROM),)
ALL-$(CONFIG_X86_RESET_VECTOR) += u-boot.rom
endif

# enable combined SPL/u-boot/dtb rules for tegra
ifeq ($(CONFIG_TEGRA)$(CONFIG_SPL),yy)
ALL-y += u-boot-tegra.bin u-boot-nodtb-tegra.bin
ALL-$(CONFIG_OF_SEPARATE) += u-boot-dtb-tegra.bin
endif

# Add optional build target if defined in board/cpu/soc headers
ifneq ($(CONFIG_BUILD_TARGET),)
ALL-y += $(CONFIG_BUILD_TARGET:"%"=%)
endif

LDFLAGS_u-boot += $(LDFLAGS_FINAL)
ifneq ($(CONFIG_SYS_TEXT_BASE),)
LDFLAGS_u-boot += -Ttext $(CONFIG_SYS_TEXT_BASE)
endif

# Normally we fill empty space with 0xff
quiet_cmd_objcopy = OBJCOPY $@
cmd_objcopy = $(OBJCOPY) --gap-fill=0xff $(OBJCOPYFLAGS) \
	$(OBJCOPYFLAGS_$(@F)) $< $@

# Provide a version which does not do this, for use by EFI
quiet_cmd_zobjcopy = OBJCOPY $@
cmd_zobjcopy = $(OBJCOPY) $(OBJCOPYFLAGS) $(OBJCOPYFLAGS_$(@F)) $< $@

quiet_cmd_efipayload = OBJCOPY $@
cmd_efipayload = $(OBJCOPY) -I binary -O $(EFIPAYLOAD_BFDTARGET) -B $(EFIPAYLOAD_BFDARCH) $< $@

quiet_cmd_mkimage = MKIMAGE $@
cmd_mkimage = $(objtree)/tools/mkimage $(MKIMAGEFLAGS_$(@F)) -d $< $@ \
	$(if $(KBUILD_VERBOSE:1=), >/dev/null)

quiet_cmd_cat = CAT     $@
cmd_cat = cat $(filter-out $(PHONY), $^) > $@

append = cat $(filter-out $< $(PHONY), $^) >> $@

quiet_cmd_pad_cat = CAT     $@
cmd_pad_cat = $(cmd_objcopy) && $(append) || rm -f $@

all:		$(ALL-y)
ifneq ($(CONFIG_SYS_GENERIC_BOARD),y)
	@echo "===================== WARNING ======================"
	@echo "Please convert this board to generic board."
	@echo "Otherwise it will be removed by the end of 2014."
	@echo "See doc/README.generic-board for further information"
	@echo "===================================================="
endif
ifeq ($(CONFIG_DM_I2C_COMPAT),y)
	@echo "===================== WARNING ======================"
	@echo "This board uses CONFIG_DM_I2C_COMPAT. Please remove"
	@echo "(possibly in a subsequent patch in your series)"
	@echo "before sending patches to the mailing list."
	@echo "===================================================="
endif

PHONY += dtbs
dtbs dts/dt.dtb: checkdtc u-boot
	$(Q)$(MAKE) $(build)=dts dtbs

quiet_cmd_copy = COPY    $@
      cmd_copy = cp $< $@

ifeq ($(CONFIG_OF_SEPARATE),y)
u-boot-dtb.bin: u-boot-nodtb.bin dts/dt.dtb FORCE
	$(call if_changed,cat)

u-boot.bin: u-boot-dtb.bin FORCE
	$(call if_changed,copy)
else
u-boot.bin: u-boot-nodtb.bin FORCE
	$(call if_changed,copy)
endif

%.imx: %.bin
	$(Q)$(MAKE) $(build)=arch/arm/imx-common $@

u-boot.dtb: dts/dt.dtb
	$(call cmd,copy)

OBJCOPYFLAGS_u-boot.hex := -O ihex

OBJCOPYFLAGS_u-boot.srec := -O srec

u-boot.hex u-boot.srec: u-boot FORCE
	$(call if_changed,objcopy)

OBJCOPYFLAGS_u-boot-nodtb.bin := -O binary \
		$(if $(CONFIG_X86_RESET_VECTOR),-R .start16 -R .resetvec)

binary_size_check: u-boot-nodtb.bin FORCE
	@file_size=$(shell wc -c u-boot-nodtb.bin | awk '{print $$1}') ; \
	map_size=$(shell cat u-boot.map | \
		awk '/_image_copy_start/ {start = $$1} /_image_binary_end/ {end = $$1} END {if (start != "" && end != "") print "ibase=16; " toupper(end) " - " toupper(start)}' \
		| sed 's/0X//g' \
		| bc); \
	if [ "" != "$$map_size" ]; then \
		if test $$map_size -ne $$file_size; then \
			echo "u-boot.map shows a binary size of $$map_size" >&2 ; \
			echo "  but u-boot-nodtb.bin shows $$file_size" >&2 ; \
			exit 1; \
		fi \
	fi

u-boot-nodtb.bin: u-boot FORCE
	$(call if_changed,objcopy)
	$(call DO_STATIC_RELA,$<,$@,$(CONFIG_SYS_TEXT_BASE))
	$(BOARD_SIZE_CHECK)

u-boot.ldr:	u-boot
		$(CREATE_LDR_ENV)
		$(LDR) -T $(CONFIG_CPU) -c $@ $< $(LDR_FLAGS)
		$(BOARD_SIZE_CHECK)

OBJCOPYFLAGS_u-boot.ldr.hex := -I binary -O ihex

OBJCOPYFLAGS_u-boot.ldr.srec := -I binary -O srec

u-boot.ldr.hex u-boot.ldr.srec: u-boot.ldr FORCE
	$(call if_changed,objcopy)

#
# U-Boot entry point, needed for booting of full-blown U-Boot
# from the SPL U-Boot version.
#
ifndef CONFIG_SYS_UBOOT_START
CONFIG_SYS_UBOOT_START := 0
endif

# Create a file containing the configuration options the image was built with
quiet_cmd_cpp_cfg = CFG     $@
cmd_cpp_cfg = $(CPP) -Wp,-MD,$(depfile) $(cpp_flags) $(LDPPFLAGS) -ansi \
	-DDO_DEPS_ONLY -D__ASSEMBLY__ -x assembler-with-cpp -P -dM -E -o $@ $<

MKIMAGEFLAGS_u-boot.img = -A $(ARCH) -T firmware -C none -O u-boot \
	-a $(CONFIG_SYS_TEXT_BASE) -e $(CONFIG_SYS_UBOOT_START) \
	-n "U-Boot $(UBOOTRELEASE) for $(BOARD) board"

MKIMAGEFLAGS_u-boot-dtb.img = $(MKIMAGEFLAGS_u-boot.img)

MKIMAGEFLAGS_u-boot.kwb = -n $(srctree)/$(CONFIG_SYS_KWD_CONFIG:"%"=%) \
	-T kwbimage -a $(CONFIG_SYS_TEXT_BASE) -e $(CONFIG_SYS_TEXT_BASE)

MKIMAGEFLAGS_u-boot-spl.kwb = -n $(srctree)/$(CONFIG_SYS_KWD_CONFIG:"%"=%) \
	-T kwbimage -a $(CONFIG_SYS_TEXT_BASE) -e $(CONFIG_SYS_TEXT_BASE)

MKIMAGEFLAGS_u-boot.pbl = -n $(srctree)/$(CONFIG_SYS_FSL_PBL_RCW:"%"=%) \
		-R $(srctree)/$(CONFIG_SYS_FSL_PBL_PBI:"%"=%) -T pblimage

u-boot-dtb.img u-boot.img u-boot.kwb u-boot.pbl: u-boot.bin FORCE
	$(call if_changed,mkimage)

u-boot-spl.kwb: u-boot.img spl/u-boot-spl.bin FORCE
	$(call if_changed,mkimage)

u-boot.sha1:	u-boot.bin
		tools/ubsha1 u-boot.bin

u-boot.dis:	u-boot
		$(OBJDUMP) -d $< > $@

u-boot.cfg:	include/config.h FORCE
	$(call if_changed,cpp_cfg)

ifdef CONFIG_TPL
SPL_PAYLOAD := tpl/u-boot-with-tpl.bin
else
SPL_PAYLOAD := u-boot.bin
endif

OBJCOPYFLAGS_u-boot-with-spl.bin = -I binary -O binary \
				   --pad-to=$(CONFIG_SPL_PAD_TO)
u-boot-with-spl.bin: spl/u-boot-spl.bin $(SPL_PAYLOAD) FORCE
	$(call if_changed,pad_cat)

MKIMAGEFLAGS_lpc32xx-spl.img = -T lpc32xximage -a $(CONFIG_SPL_TEXT_BASE)

lpc32xx-spl.img: spl/u-boot-spl.bin FORCE
	$(call if_changed,mkimage)

OBJCOPYFLAGS_lpc32xx-boot-0.bin = -I binary -O binary --pad-to=$(CONFIG_SPL_PAD_TO)

lpc32xx-boot-0.bin: lpc32xx-spl.img FORCE
	$(call if_changed,objcopy)

OBJCOPYFLAGS_lpc32xx-boot-1.bin = -I binary -O binary --pad-to=$(CONFIG_SPL_PAD_TO)

lpc32xx-boot-1.bin: lpc32xx-spl.img FORCE
	$(call if_changed,objcopy)

lpc32xx-full.bin: lpc32xx-boot-0.bin lpc32xx-boot-1.bin u-boot.img FORCE
	$(call if_changed,cat)

CLEAN_FILES += lpc32xx-*

OBJCOPYFLAGS_u-boot-with-tpl.bin = -I binary -O binary \
				   --pad-to=$(CONFIG_TPL_PAD_TO)
tpl/u-boot-with-tpl.bin: tpl/u-boot-tpl.bin u-boot.bin FORCE
	$(call if_changed,pad_cat)

SPL: spl/u-boot-spl.bin FORCE
	$(Q)$(MAKE) $(build)=arch/arm/imx-common $@

u-boot-with-spl.imx u-boot-with-nand-spl.imx: SPL u-boot.bin FORCE
	$(Q)$(MAKE) $(build)=arch/arm/imx-common $@

MKIMAGEFLAGS_u-boot.ubl = -n $(UBL_CONFIG) -T ublimage -e $(CONFIG_SYS_TEXT_BASE)

u-boot.ubl: u-boot-with-spl.bin FORCE
	$(call if_changed,mkimage)

MKIMAGEFLAGS_u-boot-spl.ais = -s -n $(if $(CONFIG_AIS_CONFIG_FILE), \
	$(srctree)/$(CONFIG_AIS_CONFIG_FILE:"%"=%),"/dev/null") \
	-T aisimage -e $(CONFIG_SPL_TEXT_BASE)
spl/u-boot-spl.ais: spl/u-boot-spl.bin FORCE
	$(call if_changed,mkimage)

OBJCOPYFLAGS_u-boot.ais = -I binary -O binary --pad-to=$(CONFIG_SPL_PAD_TO)
u-boot.ais: spl/u-boot-spl.ais u-boot.img FORCE
	$(call if_changed,pad_cat)

u-boot-signed.sb: u-boot.bin spl/u-boot-spl.bin
	$(Q)$(MAKE) $(build)=arch/arm/cpu/arm926ejs/mxs u-boot-signed.sb
u-boot.sb: u-boot.bin spl/u-boot-spl.bin
	$(Q)$(MAKE) $(build)=arch/arm/cpu/arm926ejs/mxs u-boot.sb

# On x600 (SPEAr600) U-Boot is appended to U-Boot SPL.
# Both images are created using mkimage (crc etc), so that the ROM
# bootloader can check its integrity. Padding needs to be done to the
# SPL image (with mkimage header) and not the binary. Otherwise the resulting image
# which is loaded/copied by the ROM bootloader to SRAM doesn't fit.
# The resulting image containing both U-Boot images is called u-boot.spr
MKIMAGEFLAGS_u-boot-spl.img = -A $(ARCH) -T firmware -C none \
	-a $(CONFIG_SPL_TEXT_BASE) -e $(CONFIG_SPL_TEXT_BASE) -n XLOADER
spl/u-boot-spl.img: spl/u-boot-spl.bin FORCE
	$(call if_changed,mkimage)

OBJCOPYFLAGS_u-boot.spr = -I binary -O binary --pad-to=$(CONFIG_SPL_PAD_TO) \
			  --gap-fill=0xff
u-boot.spr: spl/u-boot-spl.img u-boot.img FORCE
	$(call if_changed,pad_cat)

ifneq ($(CONFIG_ARCH_SOCFPGA),)
quiet_cmd_socboot = SOCBOOT $@
cmd_socboot = cat	spl/u-boot-spl.sfp spl/u-boot-spl.sfp	\
			spl/u-boot-spl.sfp spl/u-boot-spl.sfp	\
			u-boot.img > $@ || rm -f $@
u-boot-with-spl.sfp: spl/u-boot-spl.sfp u-boot.img FORCE
	$(call if_changed,socboot)
endif

# x86 uses a large ROM. We fill it with 0xff, put the 16-bit stuff (including
# reset vector) at the top, Intel ME descriptor at the bottom, and U-Boot in
# the middle.
ifneq ($(CONFIG_X86_RESET_VECTOR),)
rom: u-boot.rom FORCE

IFDTOOL=$(objtree)/tools/ifdtool
IFDTOOL_FLAGS  = -f 0:$(objtree)/u-boot.dtb
IFDTOOL_FLAGS += -m 0x$(shell $(NM) u-boot |grep _dt_ucode_base_size |cut -d' ' -f1)
IFDTOOL_FLAGS += -U $(CONFIG_SYS_TEXT_BASE):$(objtree)/u-boot-nodtb.bin
IFDTOOL_FLAGS += -w $(CONFIG_SYS_X86_START16):$(objtree)/u-boot-x86-16bit.bin
IFDTOOL_FLAGS += -C

ifneq ($(CONFIG_HAVE_INTEL_ME),)
IFDTOOL_ME_FLAGS  = -D $(srctree)/board/$(BOARDDIR)/descriptor.bin
IFDTOOL_ME_FLAGS += -i ME:$(srctree)/board/$(BOARDDIR)/me.bin
endif

ifneq ($(CONFIG_HAVE_MRC),)
IFDTOOL_FLAGS += -w $(CONFIG_X86_MRC_ADDR):$(srctree)/board/$(BOARDDIR)/mrc.bin
endif

ifneq ($(CONFIG_HAVE_FSP),)
IFDTOOL_FLAGS += -w $(CONFIG_FSP_ADDR):$(srctree)/board/$(BOARDDIR)/$(CONFIG_FSP_FILE)
endif

ifneq ($(CONFIG_HAVE_CMC),)
IFDTOOL_FLAGS += -w $(CONFIG_CMC_ADDR):$(srctree)/board/$(BOARDDIR)/$(CONFIG_CMC_FILE)
endif

ifneq ($(CONFIG_HAVE_VGA_BIOS),)
IFDTOOL_FLAGS += -w $(CONFIG_VGA_BIOS_ADDR):$(srctree)/board/$(BOARDDIR)/$(CONFIG_VGA_BIOS_FILE)
endif

quiet_cmd_ifdtool = IFDTOOL $@
cmd_ifdtool  = $(IFDTOOL) -c -r $(CONFIG_ROM_SIZE) u-boot.tmp;
ifneq ($(CONFIG_HAVE_INTEL_ME),)
cmd_ifdtool += $(IFDTOOL) $(IFDTOOL_ME_FLAGS) u-boot.tmp;
endif
cmd_ifdtool += $(IFDTOOL) $(IFDTOOL_FLAGS) u-boot.tmp;
cmd_ifdtool += mv u-boot.tmp $@

u-boot.rom: u-boot-x86-16bit.bin u-boot.bin FORCE
	$(call if_changed,ifdtool)

OBJCOPYFLAGS_u-boot-x86-16bit.bin := -O binary -j .start16 -j .resetvec
u-boot-x86-16bit.bin: u-boot FORCE
	$(call if_changed,objcopy)
endif

ifneq ($(CONFIG_SUNXI),)
OBJCOPYFLAGS_u-boot-sunxi-with-spl.bin = -I binary -O binary \
				   --pad-to=$(CONFIG_SPL_PAD_TO) --gap-fill=0xff
u-boot-sunxi-with-spl.bin: spl/sunxi-spl.bin u-boot.img FORCE
	$(call if_changed,pad_cat)
endif

ifneq ($(CONFIG_TEGRA),)
OBJCOPYFLAGS_u-boot-nodtb-tegra.bin = -O binary --pad-to=$(CONFIG_SYS_TEXT_BASE)
u-boot-nodtb-tegra.bin: spl/u-boot-spl u-boot-nodtb.bin FORCE
	$(call if_changed,pad_cat)

OBJCOPYFLAGS_u-boot-tegra.bin = -O binary --pad-to=$(CONFIG_SYS_TEXT_BASE)
u-boot-tegra.bin: spl/u-boot-spl u-boot.bin FORCE
	$(call if_changed,pad_cat)

u-boot-dtb-tegra.bin: u-boot-tegra.bin FORCE
	$(call if_changed,copy)
endif

OBJCOPYFLAGS_u-boot-app.efi := $(OBJCOPYFLAGS_EFI)
u-boot-app.efi: u-boot FORCE
	$(call if_changed,zobjcopy)

u-boot.bin.o: u-boot.bin FORCE
	$(call if_changed,efipayload)

u-boot-payload.lds: $(LDSCRIPT_EFI) FORCE
	$(call if_changed_dep,cpp_lds)

# Rule to link the EFI payload which contains a stub and a U-Boot binary
quiet_cmd_u-boot_payload ?= LD      $@
      cmd_u-boot_payload ?= $(LD) $(LDFLAGS_EFI_PAYLOAD) -o $@ \
      -T u-boot-payload.lds arch/x86/cpu/call32.o \
      lib/efi/efi.o lib/efi/efi_stub.o u-boot.bin.o \
      $(addprefix arch/$(ARCH)/lib/efi/,$(EFISTUB))

u-boot-payload: u-boot.bin.o u-boot-payload.lds FORCE
	$(call if_changed,u-boot_payload)

OBJCOPYFLAGS_u-boot-payload.efi := $(OBJCOPYFLAGS_EFI)
u-boot-payload.efi: u-boot-payload FORCE
	$(call if_changed,zobjcopy)

u-boot-img.bin: spl/u-boot-spl.bin u-boot.img FORCE
	$(call if_changed,cat)

#Add a target to create boot binary having SPL binary in PBI format
#concatenated with u-boot binary. It is need by PowerPC SoC having
#internal SRAM <= 512KB.
MKIMAGEFLAGS_u-boot-spl.pbl = -n $(srctree)/$(CONFIG_SYS_FSL_PBL_RCW:"%"=%) \
		-R $(srctree)/$(CONFIG_SYS_FSL_PBL_PBI:"%"=%) -T pblimage \
		-A $(ARCH) -a $(CONFIG_SPL_TEXT_BASE)

spl/u-boot-spl.pbl: spl/u-boot-spl.bin FORCE
	$(call if_changed,mkimage)

ifeq ($(ARCH),arm)
UBOOT_BINLOAD := u-boot.img
else
UBOOT_BINLOAD := u-boot.bin
endif

OBJCOPYFLAGS_u-boot-with-spl-pbl.bin = -I binary -O binary --pad-to=$(CONFIG_SPL_PAD_TO) \
			  --gap-fill=0xff

u-boot-with-spl-pbl.bin: spl/u-boot-spl.pbl $(UBOOT_BINLOAD) FORCE
	$(call if_changed,pad_cat)

# PPC4xx needs the SPL at the end of the image, since the reset vector
# is located at 0xfffffffc. So we can't use the "u-boot-img.bin" target
# and need to introduce a new build target with the full blown U-Boot
# at the start padded up to the start of the SPL image. And then concat
# the SPL image to the end.

OBJCOPYFLAGS_u-boot-img-spl-at-end.bin := -I binary -O binary \
	--pad-to=$(CONFIG_UBOOT_PAD_TO) --gap-fill=0xff
u-boot-img-spl-at-end.bin: u-boot.img spl/u-boot-spl.bin FORCE
	$(call if_changed,pad_cat)

# Create a new ELF from a raw binary file.  This is useful for arm64
# where static relocation needs to be performed on the raw binary,
# but certain simulators only accept an ELF file (but don't do the
# relocation).
# FIXME refactor dts/Makefile to share target/arch detection
u-boot.elf: u-boot.bin
	@$(OBJCOPY)  -B aarch64 -I binary -O elf64-littleaarch64 \
		$< u-boot-elf.o
	@$(LD) u-boot-elf.o -o $@ \
		--defsym=_start=$(CONFIG_SYS_TEXT_BASE) \
		-Ttext=$(CONFIG_SYS_TEXT_BASE)

# Rule to link u-boot
# May be overridden by arch/$(ARCH)/config.mk
quiet_cmd_u-boot__ ?= LD      $@
      cmd_u-boot__ ?= $(LD) $(LDFLAGS) $(LDFLAGS_u-boot) -o $@ \
      -T u-boot.lds $(u-boot-init)                             \
      --start-group $(u-boot-main) --end-group                 \
      $(PLATFORM_LIBS) -Map u-boot.map

quiet_cmd_smap = GEN     common/system_map.o
cmd_smap = \
	smap=`$(call SYSTEM_MAP,u-boot) | \
		awk '$$2 ~ /[tTwW]/ {printf $$1 $$3 "\\\\000"}'` ; \
	$(CC) $(c_flags) -DSYSTEM_MAP="\"$${smap}\"" \
		-c $(srctree)/common/system_map.c -o common/system_map.o

u-boot:	$(u-boot-init) $(u-boot-main) u-boot.lds FORCE
	$(call if_changed,u-boot__)
ifeq ($(CONFIG_KALLSYMS),y)
	$(call cmd,smap)
	$(call cmd,u-boot__) common/system_map.o
endif

quiet_cmd_sym ?= SYM     $@
      cmd_sym ?= $(OBJDUMP) -t $< > $@
u-boot.sym: u-boot FORCE
	$(call if_changed,sym)

# The actual objects are generated when descending,
# make sure no implicit rule kicks in
$(sort $(u-boot-init) $(u-boot-main)): $(u-boot-dirs) ;

# Handle descending into subdirectories listed in $(vmlinux-dirs)
# Preset locale variables to speed up the build process. Limit locale
# tweaks to this spot to avoid wrong language settings when running
# make menuconfig etc.
# Error messages still appears in the original language

PHONY += $(u-boot-dirs)
$(u-boot-dirs): prepare scripts
	$(Q)$(MAKE) $(build)=$@

tools: prepare
# The "tools" are needed early
$(filter-out tools, $(u-boot-dirs)): tools
# The "examples" conditionally depend on U-Boot (say, when USE_PRIVATE_LIBGCC
# is "yes"), so compile examples after U-Boot is compiled.
examples: $(filter-out examples, $(u-boot-dirs))

define filechk_uboot.release
	echo "$(UBOOTVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"
endef

# Store (new) UBOOTRELEASE string in include/config/uboot.release
include/config/uboot.release: include/config/auto.conf FORCE
	$(call filechk,uboot.release)


# Things we need to do before we recursively start building the kernel
# or the modules are listed in "prepare".
# A multi level approach is used. prepareN is processed before prepareN-1.
# archprepare is used in arch Makefiles and when processed asm symlink,
# version.h and scripts_basic is processed / created.

# Listed in dependency order
PHONY += prepare archprepare prepare0 prepare1 prepare2 prepare3

# prepare3 is used to check if we are building in a separate output directory,
# and if so do:
# 1) Check that make has not been executed in the kernel src $(srctree)
prepare3: include/config/uboot.release
ifneq ($(KBUILD_SRC),)
	@$(kecho) '  Using $(srctree) as source for U-Boot'
	$(Q)if [ -f $(srctree)/.config -o -d $(srctree)/include/config ]; then \
		echo >&2 "  $(srctree) is not clean, please run 'make mrproper'"; \
		echo >&2 "  in the '$(srctree)' directory.";\
		/bin/false; \
	fi;
endif

# prepare2 creates a makefile if using a separate output directory
prepare2: prepare3 outputmakefile

prepare1: prepare2 $(version_h) $(timestamp_h) \
                   include/config/auto.conf
ifeq ($(CONFIG_HAVE_GENERIC_BOARD),)
ifeq ($(CONFIG_SYS_GENERIC_BOARD),y)
	@echo >&2 "  Your architecture does not support generic board."
	@echo >&2 "  Please undefine CONFIG_SYS_GENERIC_BOARD in your board config file."
	@/bin/false
endif
endif
ifeq ($(wildcard $(LDSCRIPT)),)
	@echo >&2 "  Could not find linker script."
	@/bin/false
endif

archprepare: prepare1 scripts_basic

prepare0: archprepare FORCE
	$(Q)$(MAKE) $(build)=.

# All the preparing..
prepare: prepare0

# Generate some files
# ---------------------------------------------------------------------------

define filechk_version.h
	(echo \#define PLAIN_VERSION \"$(UBOOTRELEASE)\"; \
	echo \#define U_BOOT_VERSION \"U-Boot \" PLAIN_VERSION; \
	echo \#define CC_VERSION_STRING \"$$($(CC) --version | head -n 1)\"; \
	echo \#define LD_VERSION_STRING \"$$($(LD) --version | head -n 1)\"; )
endef

# The SOURCE_DATE_EPOCH mechanism requires a date that behaves like GNU date.
# The BSD date on the other hand behaves different and would produce errors
# with the misused '-d' switch.  Respect that and search a working date with
# well known pre- and suffixes for the GNU variant of date.
define filechk_timestamp.h
	(if test -n "$${SOURCE_DATE_EPOCH}"; then \
		SOURCE_DATE="@$${SOURCE_DATE_EPOCH}"; \
		DATE=""; \
		for date in gdate date.gnu date; do \
			$${date} -u -d "$${SOURCE_DATE}" >/dev/null 2>&1 && DATE="$${date}"; \
		done; \
		if test -n "$${DATE}"; then \
			LC_ALL=C $${DATE} -u -d "$${SOURCE_DATE}" +'#define U_BOOT_DATE "%b %d %C%y"'; \
			LC_ALL=C $${DATE} -u -d "$${SOURCE_DATE}" +'#define U_BOOT_TIME "%T"'; \
			LC_ALL=C $${DATE} -u -d "$${SOURCE_DATE}" +'#define U_BOOT_TZ "%z"'; \
			LC_ALL=C $${DATE} -u -d "$${SOURCE_DATE}" +'#define U_BOOT_DMI_DATE "%m/%d/%Y"'; \
		else \
			return 42; \
		fi; \
	else \
		LC_ALL=C date +'#define U_BOOT_DATE "%b %d %C%y"'; \
		LC_ALL=C date +'#define U_BOOT_TIME "%T"'; \
		LC_ALL=C date +'#define U_BOOT_TZ "%z"'; \
		LC_ALL=C date +'#define U_BOOT_DMI_DATE "%m/%d/%Y"'; \
	fi)
endef

$(version_h): include/config/uboot.release FORCE
	$(call filechk,version.h)

$(timestamp_h): $(srctree)/Makefile FORCE
	$(call filechk,timestamp.h)

# ---------------------------------------------------------------------------
quiet_cmd_cpp_lds = LDS     $@
cmd_cpp_lds = $(CPP) -Wp,-MD,$(depfile) $(cpp_flags) $(LDPPFLAGS) -ansi \
		-D__ASSEMBLY__ -x assembler-with-cpp -P -o $@ $<

u-boot.lds: $(LDSCRIPT) prepare FORCE
	$(call if_changed_dep,cpp_lds)

spl/u-boot-spl.bin: spl/u-boot-spl
	@:
spl/u-boot-spl: tools prepare $(if $(CONFIG_OF_SEPARATE),dts/dt.dtb)
	$(Q)$(MAKE) obj=spl -f $(srctree)/scripts/Makefile.spl all

spl/sunxi-spl.bin: spl/u-boot-spl
	@:

spl/u-boot-spl.sfp: spl/u-boot-spl
	@:

spl/boot.bin: spl/u-boot-spl
	@:

tpl/u-boot-tpl.bin: tools prepare
	$(Q)$(MAKE) obj=tpl -f $(srctree)/scripts/Makefile.spl all

TAG_SUBDIRS := $(patsubst %,$(srctree)/%,$(u-boot-dirs) include)

FIND := find
FINDFLAGS := -L

tags ctags:
		ctags -w -o ctags `$(FIND) $(FINDFLAGS) $(TAG_SUBDIRS) \
						-name '*.[chS]' -print`
		ln -s ctags tags

etags:
		etags -a -o etags `$(FIND) $(FINDFLAGS) $(TAG_SUBDIRS) \
						-name '*.[chS]' -print`
cscope:
		$(FIND) $(FINDFLAGS) $(TAG_SUBDIRS) -name '*.[chS]' -print > \
						cscope.files
		cscope -b -q -k

SYSTEM_MAP = \
		$(NM) $1 | \
		grep -v '\(compiled\)\|\(\.o$$\)\|\( [aUw] \)\|\(\.\.ng$$\)\|\(LASH[RL]DI\)' | \
		LC_ALL=C sort
System.map:	u-boot
		@$(call SYSTEM_MAP,$<) > $@

checkdtc:
	@if test $(call dtc-version) -lt 0104; then \
		echo '*** Your dtc is too old, please upgrade to dtc 1.4 or newer'; \
		false; \
	fi

#########################################################################

# ARM relocations should all be R_ARM_RELATIVE (32-bit) or
# R_AARCH64_RELATIVE (64-bit).
checkarmreloc: u-boot
	@RELOC="`$(CROSS_COMPILE)readelf -r -W $< | cut -d ' ' -f 4 | \
		grep R_A | sort -u`"; \
	if test "$$RELOC" != "R_ARM_RELATIVE" -a \
		 "$$RELOC" != "R_AARCH64_RELATIVE"; then \
		echo "$< contains unexpected relocations: $$RELOC"; \
		false; \
	fi

env: scripts_basic
	$(Q)$(MAKE) $(build)=tools/$@

tools-only: scripts_basic $(version_h) $(timestamp_h)
	$(Q)$(MAKE) $(build)=tools

tools-all: export HOST_TOOLS_ALL=y
tools-all: env tools ;

cross_tools: export CROSS_BUILD_TOOLS=y
cross_tools: tools ;

.PHONY : CHANGELOG
CHANGELOG:
	git log --no-merges U-Boot-1_1_5.. | \
	unexpand -a | sed -e 's/\s\s*$$//' > $@

include/license.h: tools/bin2header COPYING
	cat COPYING | gzip -9 -c | ./tools/bin2header license_gzip > include/license.h
#########################################################################

###
# Cleaning is done on three levels.
# make clean     Delete most generated files
#                Leave enough to build external modules
# make mrproper  Delete the current configuration, and all generated files
# make distclean Remove editor backup files, patch leftover files and the like

# Directories & files removed with 'make clean'
CLEAN_DIRS  += $(MODVERDIR) \
	       $(foreach d, spl tpl, $(patsubst %,$d/%, \
			$(filter-out include, $(shell ls -1 $d 2>/dev/null))))

CLEAN_FILES += include/bmp_logo.h include/bmp_logo_data.h \
	       boot* u-boot* MLO* SPL System.map

# Directories & files removed with 'make mrproper'
MRPROPER_DIRS  += include/config include/generated spl tpl \
		  .tmp_objdiff
MRPROPER_FILES += .config .config.old include/autoconf.mk* include/config.h \
		  ctags etags TAGS cscope* GPATH GTAGS GRTAGS GSYMS

# clean - Delete most, but leave enough to build external modules
#
clean: rm-dirs  := $(CLEAN_DIRS)
clean: rm-files := $(CLEAN_FILES)

clean-dirs	:= $(foreach f,$(u-boot-alldirs),$(if $(wildcard $(srctree)/$f/Makefile),$f))

clean-dirs      := $(addprefix _clean_, $(clean-dirs) doc/DocBook)

PHONY += $(clean-dirs) clean archclean
$(clean-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _clean_%,%,$@)

# TODO: Do not use *.cfgtmp
clean: $(clean-dirs)
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)
	@find $(if $(KBUILD_EXTMOD), $(KBUILD_EXTMOD), .) $(RCS_FIND_IGNORE) \
		\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
		-o -name '*.ko.*' -o -name '*.su' -o -name '*.cfgtmp' \
		-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
		-o -name '*.symtypes' -o -name 'modules.order' \
		-o -name modules.builtin -o -name '.tmp_*.o.*' \
		-o -name '*.gcno' \) -type f -print | xargs rm -f

# mrproper - Delete all generated files, including .config
#
mrproper: rm-dirs  := $(wildcard $(MRPROPER_DIRS))
mrproper: rm-files := $(wildcard $(MRPROPER_FILES))
mrproper-dirs      := $(addprefix _mrproper_,scripts)

PHONY += $(mrproper-dirs) mrproper archmrproper
$(mrproper-dirs):
	$(Q)$(MAKE) $(clean)=$(patsubst _mrproper_%,%,$@)

mrproper: clean $(mrproper-dirs)
	$(call cmd,rmdirs)
	$(call cmd,rmfiles)
	@rm -f arch/*/include/asm/arch

# distclean
#
PHONY += distclean

distclean: mrproper
	@find $(srctree) $(RCS_FIND_IGNORE) \
		\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
		-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
		-o -name '.*.rej' -o -name '*%' -o -name 'core' \
		-o -name '*.pyc' \) \
		-type f -print | xargs rm -f
	@rm -f boards.cfg

backup:
	F=`basename $(srctree)` ; cd .. ; \
	gtar --force-local -zcvf `LC_ALL=C date "+$$F-%Y-%m-%d-%T.tar.gz"` $$F

help:
	@echo  'Cleaning targets:'
	@echo  '  clean		  - Remove most generated files but keep the config'
	@echo  '  mrproper	  - Remove all generated files + config + various backup files'
	@echo  '  distclean	  - mrproper + remove editor backup and patch files'
	@echo  ''
	@echo  'Configuration targets:'
	@$(MAKE) -f $(srctree)/scripts/kconfig/Makefile help
	@echo  ''
	@echo  'Other generic targets:'
	@echo  '  all		  - Build all necessary images depending on configuration'
	@echo  '* u-boot	  - Build the bare u-boot'
	@echo  '  dir/            - Build all files in dir and below'
	@echo  '  dir/file.[oisS] - Build specified target only'
	@echo  '  dir/file.lst    - Build specified mixed source/assembly target only'
	@echo  '                    (requires a recent binutils and recent build (System.map))'
	@echo  '  tags/ctags	  - Generate ctags file for editors'
	@echo  '  etags		  - Generate etags file for editors'
	@echo  '  cscope	  - Generate cscope index'
	@echo  '  ubootrelease	  - Output the release version string (use with make -s)'
	@echo  '  ubootversion	  - Output the version stored in Makefile (use with make -s)'
	@echo  ''
	@echo  'Static analysers'
	@echo  '  checkstack      - Generate a list of stack hogs'
	@echo  ''
	@echo  'Documentation targets:'
	@$(MAKE) -f $(srctree)/doc/DocBook/Makefile dochelp
	@echo  ''
	@echo  '  make V=0|1 [targets] 0 => quiet build (default), 1 => verbose build'
	@echo  '  make V=2   [targets] 2 => give reason for rebuild of target'
	@echo  '  make O=dir [targets] Locate all output files in "dir", including .config'
	@echo  '  make C=1   [targets] Check all c source with $$CHECK (sparse by default)'
	@echo  '  make C=2   [targets] Force check of all c source with $$CHECK'
	@echo  '  make RECORDMCOUNT_WARN=1 [targets] Warn about ignored mcount sections'
	@echo  '  make W=n   [targets] Enable extra gcc checks, n=1,2,3 where'
	@echo  '		1: warnings which may be relevant and do not occur too often'
	@echo  '		2: warnings which occur quite often but may still be relevant'
	@echo  '		3: more obscure warnings, can most likely be ignored'
	@echo  '		Multiple levels can be combined with W=12 or W=123'
	@echo  ''
	@echo  'Execute "make" or "make all" to build all targets marked with [*] '
	@echo  'For further info see the ./README file'


# Documentation targets
# ---------------------------------------------------------------------------
%docs: scripts_basic FORCE
	$(Q)$(MAKE) $(build)=scripts build_docproc
	$(Q)$(MAKE) $(build)=doc/DocBook $@

# Dummies...
PHONY += prepare scripts
prepare: ;
scripts: ;

endif #ifeq ($(config-targets),1)
endif #ifeq ($(mixed-targets),1)

PHONY += checkstack ubootrelease ubootversion

checkstack:
	$(OBJDUMP) -d u-boot $$(find . -name u-boot-spl) | \
	$(PERL) $(src)/scripts/checkstack.pl $(ARCH)

ubootrelease:
	@echo "$(UBOOTVERSION)$$($(CONFIG_SHELL) $(srctree)/scripts/setlocalversion $(srctree))"

ubootversion:
	@echo $(UBOOTVERSION)

# Single targets
# ---------------------------------------------------------------------------
# Single targets are compatible with:
# - build with mixed source and output
# - build with separate output dir 'make O=...'
# - external modules
#
#  target-dir => where to store outputfile
#  build-dir  => directory in kernel source tree to use

ifeq ($(KBUILD_EXTMOD),)
        build-dir  = $(patsubst %/,%,$(dir $@))
        target-dir = $(dir $@)
else
        zap-slash=$(filter-out .,$(patsubst %/,%,$(dir $@)))
        build-dir  = $(KBUILD_EXTMOD)$(if $(zap-slash),/$(zap-slash))
        target-dir = $(if $(KBUILD_EXTMOD),$(dir $<),$(dir $@))
endif

%.s: %.c prepare scripts FORCE
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
%.i: %.c prepare scripts FORCE
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
%.o: %.c prepare scripts FORCE
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
%.lst: %.c prepare scripts FORCE
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
%.s: %.S prepare scripts FORCE
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
%.o: %.S prepare scripts FORCE
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)
%.symtypes: %.c prepare scripts FORCE
	$(Q)$(MAKE) $(build)=$(build-dir) $(target-dir)$(notdir $@)

# Modules
/: prepare scripts FORCE
	$(cmd_crmodverdir)
	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
	$(build)=$(build-dir)
%/: prepare scripts FORCE
	$(cmd_crmodverdir)
	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1) \
	$(build)=$(build-dir)
%.ko: prepare scripts FORCE
	$(cmd_crmodverdir)
	$(Q)$(MAKE) KBUILD_MODULES=$(if $(CONFIG_MODULES),1)   \
	$(build)=$(build-dir) $(@:.ko=.o)
	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost

# FIXME Should go into a make.lib or something
# ===========================================================================

quiet_cmd_rmdirs = $(if $(wildcard $(rm-dirs)),CLEAN   $(wildcard $(rm-dirs)))
      cmd_rmdirs = rm -rf $(rm-dirs)

quiet_cmd_rmfiles = $(if $(wildcard $(rm-files)),CLEAN   $(wildcard $(rm-files)))
      cmd_rmfiles = rm -f $(rm-files)

# read all saved command lines

targets := $(wildcard $(sort $(targets)))
cmd_files := $(wildcard .*.cmd $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))

ifneq ($(cmd_files),)
  $(cmd_files): ;	# Do not try to update included dependency files
  include $(cmd_files)
endif

endif	# skip-makefile

PHONY += FORCE
FORCE:

# Declare the contents of the .PHONY variable as phony.  We keep that
# information in a variable so we can use it in if_changed and friends.
.PHONY: $(PHONY)

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在使用make xxx_defconfig的时候，会执行脚本scripts/Makefile.build

@make -f ./scripts/Makefile.build obj=scripts/basic 
@make -f ./scripts/Makefile.build obj=scripts/kconfig xxx_defconfig 
1
2

scripts/Makefile.build

# ==========================================================================
# Building
# ==========================================================================
#
# SPDX-License-Identifier:	GPL-2.0
#

# Modified for U-Boot
prefix := tpl
src := $(patsubst $(prefix)/%,%,$(obj))
ifeq ($(obj),$(src))
prefix := spl
src := $(patsubst $(prefix)/%,%,$(obj))
ifeq ($(obj),$(src))
prefix := .
endif
endif

PHONY := __build
__build:

# Init all relevant variables used in kbuild files so
# 1) they have correct type
# 2) they do not inherit any value from the environment
obj-y :=
obj-m :=
lib-y :=
lib-m :=
always :=
targets :=
subdir-y :=
subdir-m :=
EXTRA_AFLAGS   :=
EXTRA_CFLAGS   :=
EXTRA_CPPFLAGS :=
EXTRA_LDFLAGS  :=
asflags-y  :=
ccflags-y  :=
cppflags-y :=
ldflags-y  :=

subdir-asflags-y :=
subdir-ccflags-y :=

# Read auto.conf if it exists, otherwise ignore
# Modified for U-Boot
-include include/config/auto.conf
-include $(prefix)/include/autoconf.mk
include scripts/Makefile.uncmd_spl

include scripts/Kbuild.include

# For backward compatibility check that these variables do not change
save-cflags := $(CFLAGS)

# The filename Kbuild has precedence over Makefile
kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
# $(if $(filter /%, scripts/basic),  scripts/basic, ./scripts/basic)
# $(filter /%, scripts/basic) 没有/开头的单词，所以结果为空
kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
# kbuild-dir = ./scripts/basic
# 展开为$(if $(wildcard ./scripts/basic/Kbuild), ./scripts/basic/Kbuild, ./scripts/basic/Makefile) 
# kbuild-file = ./scripts/basic/Makefile
include $(kbuild-file)

# Added for U-Boot
asflags-y  += $(PLATFORM_CPPFLAGS)
ccflags-y  += $(PLATFORM_CPPFLAGS)
cppflags-y += $(PLATFORM_CPPFLAGS)

# If the save-* variables changed error out
ifeq ($(KBUILD_NOPEDANTIC),)
        ifneq ("$(save-cflags)","$(CFLAGS)")
                $(error CFLAGS was changed in "$(kbuild-file)". Fix it to use ccflags-y)
        endif
endif

include scripts/Makefile.lib

ifdef host-progs
ifneq ($(hostprogs-y),$(host-progs))
$(warning kbuild: $(obj)/Makefile - Usage of host-progs is deprecated. Please replace with hostprogs-y!)
hostprogs-y += $(host-progs)
endif
endif

# Do not include host rules unless needed
ifneq ($(hostprogs-y)$(hostprogs-m),)
include scripts/Makefile.host
endif

# Uncommented for U-Boot
#  We need to create output dicrectory for SPL and TPL even for in-tree build
#ifneq ($(KBUILD_SRC),)
# Create output directory if not already present
_dummy := $(shell [ -d $(obj) ] || mkdir -p $(obj))

# Create directories for object files if directory does not exist
# Needed when obj-y := dir/file.o syntax is used
_dummy := $(foreach d,$(obj-dirs), $(shell [ -d $(d) ] || mkdir -p $(d)))
#endif

ifndef obj
$(warning kbuild: Makefile.build is included improperly)
endif

# ===========================================================================

ifneq ($(strip $(lib-y) $(lib-m) $(lib-)),)
lib-target := $(obj)/lib.a
endif

ifneq ($(strip $(obj-y) $(obj-m) $(obj-) $(subdir-m) $(lib-target)),)
builtin-target := $(obj)/built-in.o
endif

modorder-target := $(obj)/modules.order

# We keep a list of all modules in $(MODVERDIR)

__build: $(if $(KBUILD_BUILTIN),$(builtin-target) $(lib-target) $(extra-y)) \
	 $(if $(KBUILD_MODULES),$(obj-m) $(modorder-target)) \
	 $(subdir-ym) $(always)
	@:
# __build为默认目标
# __build:$(builtin-target) $(lib-target) $(extra-y)) $(subdir-ym) $(always) @: 

# Linus' kernel sanity checking tool
ifneq ($(KBUILD_CHECKSRC),0)
  ifeq ($(KBUILD_CHECKSRC),2)
    quiet_cmd_force_checksrc = CHECK   $<
          cmd_force_checksrc = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
  else
      quiet_cmd_checksrc     = CHECK   $<
            cmd_checksrc     = $(CHECK) $(CHECKFLAGS) $(c_flags) $< ;
  endif
endif

# Do section mismatch analysis for each module/built-in.o
ifdef CONFIG_DEBUG_SECTION_MISMATCH
  cmd_secanalysis = ; scripts/mod/modpost $@
endif

# Compile C sources (.c)
# ---------------------------------------------------------------------------

# Default is built-in, unless we know otherwise
modkern_cflags =                                          \
	$(if $(part-of-module),                           \
		$(KBUILD_CFLAGS_MODULE) $(CFLAGS_MODULE), \
		$(KBUILD_CFLAGS_KERNEL) $(CFLAGS_KERNEL))
quiet_modtag := $(empty)   $(empty)

$(real-objs-m)        : part-of-module := y
$(real-objs-m:.o=.i)  : part-of-module := y
$(real-objs-m:.o=.s)  : part-of-module := y
$(real-objs-m:.o=.lst): part-of-module := y

$(real-objs-m)        : quiet_modtag := [M]
$(real-objs-m:.o=.i)  : quiet_modtag := [M]
$(real-objs-m:.o=.s)  : quiet_modtag := [M]
$(real-objs-m:.o=.lst): quiet_modtag := [M]

$(obj-m)              : quiet_modtag := [M]

# Default for not multi-part modules
modname = $(basetarget)

$(multi-objs-m)         : modname = $(modname-multi)
$(multi-objs-m:.o=.i)   : modname = $(modname-multi)
$(multi-objs-m:.o=.s)   : modname = $(modname-multi)
$(multi-objs-m:.o=.lst) : modname = $(modname-multi)
$(multi-objs-y)         : modname = $(modname-multi)
$(multi-objs-y:.o=.i)   : modname = $(modname-multi)
$(multi-objs-y:.o=.s)   : modname = $(modname-multi)
$(multi-objs-y:.o=.lst) : modname = $(modname-multi)

quiet_cmd_cc_s_c = CC $(quiet_modtag)  $@
cmd_cc_s_c       = $(CC) $(c_flags) $(DISABLE_LTO) -fverbose-asm -S -o $@ $<

$(obj)/%.s: $(src)/%.c FORCE
	$(call if_changed_dep,cc_s_c)

quiet_cmd_cc_i_c = CPP $(quiet_modtag) $@
cmd_cc_i_c       = $(CPP) $(c_flags)   -o $@ $<

$(obj)/%.i: $(src)/%.c FORCE
	$(call if_changed_dep,cc_i_c)

cmd_gensymtypes =                                                           \
    $(CPP) -D__GENKSYMS__ $(c_flags) $< |                                   \
    $(GENKSYMS) $(if $(1), -T $(2))                                         \
     $(patsubst y,-s _,$(CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX))             \
     $(if $(KBUILD_PRESERVE),-p)                                            \
     -r $(firstword $(wildcard $(2:.symtypes=.symref) /dev/null))

quiet_cmd_cc_symtypes_c = SYM $(quiet_modtag) $@
cmd_cc_symtypes_c =                                                         \
    set -e;                                                                 \
    $(call cmd_gensymtypes,true,$@) >/dev/null;                             \
    test -s $@ || rm -f $@

$(obj)/%.symtypes : $(src)/%.c FORCE
	$(call cmd,cc_symtypes_c)

# C (.c) files
# The C file is compiled and updated dependency information is generated.
# (See cmd_cc_o_c + relevant part of rule_cc_o_c)

quiet_cmd_cc_o_c = CC $(quiet_modtag)  $@

ifndef CONFIG_MODVERSIONS
cmd_cc_o_c = $(CC) $(c_flags) -c -o $@ $<

else
# When module versioning is enabled the following steps are executed:
# o compile a .tmp_.o from .c
# o if .tmp_.o doesn't contain a __ksymtab version, i.e. does
#   not export symbols, we just rename .tmp_.o to .o and
#   are done.
# o otherwise, we calculate symbol versions using the good old
#   genksyms on the preprocessed source and postprocess them in a way
#   that they are usable as a linker script
# o generate .o from .tmp_.o using the linker to
#   replace the unresolved symbols __crc_exported_symbol with
#   the actual value of the checksum generated by genksyms

cmd_cc_o_c = $(CC) $(c_flags) -c -o $(@D)/.tmp_$(@F) $<
cmd_modversions =								\
	if $(OBJDUMP) -h $(@D)/.tmp_$(@F) | grep -q __ksymtab; then		\
		$(call cmd_gensymtypes,$(KBUILD_SYMTYPES),$(@:.o=.symtypes))	\
		    > $(@D)/.tmp_$(@F:.o=.ver);					\
										\
		$(LD) $(LDFLAGS) -r -o $@ $(@D)/.tmp_$(@F) 			\
			-T $(@D)/.tmp_$(@F:.o=.ver);				\
		rm -f $(@D)/.tmp_$(@F) $(@D)/.tmp_$(@F:.o=.ver);		\
	else									\
		mv -f $(@D)/.tmp_$(@F) $@;					\
	fi;
endif

ifdef CONFIG_FTRACE_MCOUNT_RECORD
ifdef BUILD_C_RECORDMCOUNT
ifeq ("$(origin RECORDMCOUNT_WARN)", "command line")
  RECORDMCOUNT_FLAGS = -w
endif
# Due to recursion, we must skip empty.o.
# The empty.o file is created in the make process in order to determine
#  the target endianness and word size. It is made before all other C
#  files, including recordmcount.
sub_cmd_record_mcount =					\
	if [ $(@) != "scripts/mod/empty.o" ]; then	\
		$(objtree)/scripts/recordmcount $(RECORDMCOUNT_FLAGS) "$(@)";	\
	fi;
recordmcount_source := $(srctree)/scripts/recordmcount.c \
		    $(srctree)/scripts/recordmcount.h
else
sub_cmd_record_mcount = set -e ; perl $(srctree)/scripts/recordmcount.pl "$(ARCH)" \
	"$(if $(CONFIG_CPU_BIG_ENDIAN),big,little)" \
	"$(if $(CONFIG_64BIT),64,32)" \
	"$(OBJDUMP)" "$(OBJCOPY)" "$(CC) $(KBUILD_CFLAGS)" \
	"$(LD)" "$(NM)" "$(RM)" "$(MV)" \
	"$(if $(part-of-module),1,0)" "$(@)";
recordmcount_source := $(srctree)/scripts/recordmcount.pl
endif
cmd_record_mcount =						\
	if [ "$(findstring $(CC_FLAGS_FTRACE),$(_c_flags))" =	\
	     "$(CC_FLAGS_FTRACE)" ]; then			\
		$(sub_cmd_record_mcount)			\
	fi;
endif

define rule_cc_o_c
	$(call echo-cmd,checksrc) $(cmd_checksrc)			  \
	$(call echo-cmd,cc_o_c) $(cmd_cc_o_c);				  \
	$(cmd_modversions)						  \
	$(call echo-cmd,record_mcount)					  \
	$(cmd_record_mcount)						  \
	scripts/basic/fixdep $(depfile) $@ '$(call make-cmd,cc_o_c)' >    \
	                                              $(dot-target).tmp;  \
	rm -f $(depfile);						  \
	mv -f $(dot-target).tmp $(dot-target).cmd
endef

# Built-in and composite module parts
$(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
	$(call cmd,force_checksrc)
	$(call if_changed_rule,cc_o_c)

# Single-part modules are special since we need to mark them in $(MODVERDIR)

$(single-used-m): $(obj)/%.o: $(src)/%.c $(recordmcount_source) FORCE
	$(call cmd,force_checksrc)
	$(call if_changed_rule,cc_o_c)
	@{ echo $(@:.o=.ko); echo $@; } > $(MODVERDIR)/$(@F:.o=.mod)

quiet_cmd_cc_lst_c = MKLST   $@
      cmd_cc_lst_c = $(CC) $(c_flags) -g -c -o $*.o $< && \
		     $(CONFIG_SHELL) $(srctree)/scripts/makelst $*.o \
				     System.map $(OBJDUMP) > $@

$(obj)/%.lst: $(src)/%.c FORCE
	$(call if_changed_dep,cc_lst_c)

# Compile assembler sources (.S)
# ---------------------------------------------------------------------------

modkern_aflags := $(KBUILD_AFLAGS_KERNEL) $(AFLAGS_KERNEL)

$(real-objs-m)      : modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)
$(real-objs-m:.o=.s): modkern_aflags := $(KBUILD_AFLAGS_MODULE) $(AFLAGS_MODULE)

quiet_cmd_as_s_S = CPP $(quiet_modtag) $@
cmd_as_s_S       = $(CPP) $(a_flags)   -o $@ $<

$(obj)/%.s: $(src)/%.S FORCE
	$(call if_changed_dep,as_s_S)

quiet_cmd_as_o_S = AS $(quiet_modtag)  $@
cmd_as_o_S       = $(CC) $(a_flags) -c -o $@ $<

$(obj)/%.o: $(src)/%.S FORCE
	$(call if_changed_dep,as_o_S)

targets += $(real-objs-y) $(real-objs-m) $(lib-y)
targets += $(extra-y) $(MAKECMDGOALS) $(always)

# Linker scripts preprocessor (.lds.S -> .lds)
# ---------------------------------------------------------------------------
quiet_cmd_cpp_lds_S = LDS     $@
      cmd_cpp_lds_S = $(CPP) $(cpp_flags) -P -C -U$(ARCH) \
	                     -D__ASSEMBLY__ -DLINKER_SCRIPT -o $@ $<

$(obj)/%.lds: $(src)/%.lds.S FORCE
	$(call if_changed_dep,cpp_lds_S)

# ASN.1 grammar
# ---------------------------------------------------------------------------
quiet_cmd_asn1_compiler = ASN.1   $@
      cmd_asn1_compiler = $(objtree)/scripts/asn1_compiler $< \
				$(subst .h,.c,$@) $(subst .c,.h,$@)

.PRECIOUS: $(objtree)/$(obj)/%-asn1.c $(objtree)/$(obj)/%-asn1.h

$(obj)/%-asn1.c $(obj)/%-asn1.h: $(src)/%.asn1 $(objtree)/scripts/asn1_compiler
	$(call cmd,asn1_compiler)

# Build the compiled-in targets
# ---------------------------------------------------------------------------

# To build objects in subdirs, we need to descend into the directories
$(sort $(subdir-obj-y)): $(subdir-ym) ;

#
# Rule to compile a set of .o files into one .o file
#
ifdef builtin-target
quiet_cmd_link_o_target = LD      $@
# If the list of objects to link is empty, just create an empty built-in.o
cmd_link_o_target = $(if $(strip $(obj-y)),\
		      $(LD) $(ld_flags) -r -o $@ $(filter $(obj-y), $^) \
		      $(cmd_secanalysis),\
		      rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@)

$(builtin-target): $(obj-y) FORCE
	$(call if_changed,link_o_target)

targets += $(builtin-target)
endif # builtin-target

#
# Rule to create modules.order file
#
# Create commands to either record .ko file or cat modules.order from
# a subdirectory
modorder-cmds =						\
	$(foreach m, $(modorder),			\
		$(if $(filter %/modules.order, $m),	\
			cat $m;, echo kernel/$m;))

$(modorder-target): $(subdir-ym) FORCE
	$(Q)(cat /dev/null; $(modorder-cmds)) > $@

#
# Rule to compile a set of .o files into one .a file
#
ifdef lib-target
quiet_cmd_link_l_target = AR      $@
cmd_link_l_target = rm -f $@; $(AR) rcs$(KBUILD_ARFLAGS) $@ $(lib-y)

$(lib-target): $(lib-y) FORCE
	$(call if_changed,link_l_target)

targets += $(lib-target)
endif

#
# Rule to link composite objects
#
#  Composite objects are specified in kbuild makefile as follows:
#    -objs := 
#  or
#    -y    := 
link_multi_deps =                     \
$(filter $(addprefix $(obj)/,         \
$($(subst $(obj)/,,$(@:.o=-objs)))    \
$($(subst $(obj)/,,$(@:.o=-y)))), $^)

quiet_cmd_link_multi-y = LD      $@
cmd_link_multi-y = $(LD) $(ld_flags) -r -o $@ $(link_multi_deps) $(cmd_secanalysis)

quiet_cmd_link_multi-m = LD [M]  $@
cmd_link_multi-m = $(cmd_link_multi-y)

$(multi-used-y): FORCE
	$(call if_changed,link_multi-y)
$(call multi_depend, $(multi-used-y), .o, -objs -y)

$(multi-used-m): FORCE
	$(call if_changed,link_multi-m)
	@{ echo $(@:.o=.ko); echo $(link_multi_deps); } > $(MODVERDIR)/$(@F:.o=.mod)
$(call multi_depend, $(multi-used-m), .o, -objs -y)

targets += $(multi-used-y) $(multi-used-m)


# Descending
# ---------------------------------------------------------------------------

PHONY += $(subdir-ym)
$(subdir-ym):
	$(Q)$(MAKE) $(build)=$@

# Add FORCE to the prequisites of a target to force it to be always rebuilt.
# ---------------------------------------------------------------------------

PHONY += FORCE

FORCE:

# Read all saved command lines and dependencies for the $(targets) we
# may be building above, using $(if_changed{,_dep}). As an
# optimization, we don't need to read them if the target does not
# exist, we will rebuild anyway in that case.

targets := $(wildcard $(sort $(targets)))
cmd_files := $(wildcard $(foreach f,$(targets),$(dir $(f)).$(notdir $(f)).cmd))

ifneq ($(cmd_files),)
  include $(cmd_files)
endif

# Declare the contents of the .PHONY variable as phony.  We keep that
# information in a variable se we can use it in if_changed and friends.

.PHONY: $(PHONY)

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