rtems source builder 构建交叉编译工具链

rtems ftp site:
	https://ftp.rtems.org/pub/rtems/releases/4.11/4.11.0/
check bsets:
	../source-builder/sb-set-builder --list-bsets
check bsp:
	https://docs.rtems.org/branches/master/user/bsps/index.html
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../source-builder/sb-set-builder --prefix=$HOME/rtems-toolset-install --with-rtems-bsp=mpc55xxevb  4.11/rtems-powerpc --no-clean
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