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https://github.com/AsahiLinux/u-boot
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9e4140329e
This commit changes the working directory where the build process occurs. Before this commit, build process occurred under the source tree for both in-tree and out-of-tree build. That's why we needed to add $(obj) prefix to all generated files in makefiles like follows: $(obj)u-boot.bin: $(obj)u-boot Here, $(obj) is empty for in-tree build, whereas it points to the output directory for out-of-tree build. And our old build system changes the current working directory with "make -C <sub-dir>" syntax when descending into the sub-directories. On the other hand, Kbuild uses a different idea to handle out-of-tree build and directory descending. The build process of Kbuild always occurs under the output tree. When "O=dir/to/store/output/files" is given, the build system changes the current working directory to that directory and restarts the make. Kbuild uses "make -f $(srctree)/scripts/Makefile.build obj=<sub-dir>" syntax for descending into sub-directories. (We can write it like "make $(obj)=<sub-dir>" with a shorthand.) This means the current working directory is always the top of the output directory. Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com> Tested-by: Gerhard Sittig <gsi@denx.de>
12 lines
245 B
Makefile
12 lines
245 B
Makefile
#
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# Copyright (C) Freescale Semiconductor, Inc. 2006.
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#
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# SPDX-License-Identifier: GPL-2.0+
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#
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obj-y := mvblm7.o pci.o fpga.o
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extra-y := bootscript.img
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$(obj)/bootscript.img: $(src)/bootscript
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@mkimage -T script -C none -n M7_script -d $< $@
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