mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-06-09 23:36:03 +09:00
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>
71 lines
1.9 KiB
Makefile
71 lines
1.9 KiB
Makefile
#
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# (C) Copyright 2007
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# Stefan Roese, DENX Software Engineering, sr@denx.de.
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# (C) Copyright 2008 Freescale Semiconductor
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#
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# SPDX-License-Identifier: GPL-2.0+
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#
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PAD_TO := 0xfff04000
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nandobj := $(OBJTREE)/nand_spl/
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LDSCRIPT= $(TOPDIR)/nand_spl/board/$(BOARDDIR)/u-boot.lds
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LDFLAGS := -T $(nandobj)u-boot.lds -Ttext $(CONFIG_SYS_TEXT_BASE_SPL) \
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$(LDFLAGS) $(LDFLAGS_FINAL)
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AFLAGS += -DCONFIG_NAND_SPL
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CFLAGS += -DCONFIG_NAND_SPL
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SOBJS = start.o ticks.o
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COBJS = nand_boot_fsl_elbc.o $(BOARD).o sdram.o ns16550.o spl_minimal.o \
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time.o cache.o
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SRCS := $(addprefix $(obj)/,$(SOBJS:.o=.S) $(COBJS:.o=.c))
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OBJS := $(addprefix $(obj)/,$(SOBJS) $(COBJS))
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__OBJS := $(SOBJS) $(COBJS)
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LNDIR := $(nandobj)board/$(BOARDDIR)
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all: $(nandobj)u-boot-spl.bin $(nandobj)u-boot-spl-16k.bin
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$(nandobj)u-boot-spl-16k.bin: $(nandobj)u-boot-spl
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$(OBJCOPY) ${OBJCFLAGS} --pad-to=$(PAD_TO) -O binary $< $@
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$(nandobj)u-boot-spl.bin: $(nandobj)u-boot-spl
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$(OBJCOPY) ${OBJCFLAGS} -O binary $< $@
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$(nandobj)u-boot-spl: $(OBJS) $(nandobj)u-boot.lds
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cd $(LNDIR) && $(LD) $(LDFLAGS) $(__OBJS) $(PLATFORM_LIBS) \
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-Map $(nandobj)u-boot-spl.map -o $@
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$(nandobj)u-boot.lds: $(LDSCRIPT)
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$(CPP) $(CPPFLAGS) $(LDPPFLAGS) -ansi -D__ASSEMBLY__ -P - <$^ >$@
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# create symbolic links for common files
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$(obj)/start.S:
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ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc83xx/start.S $@
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$(obj)/nand_boot_fsl_elbc.c:
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ln -sf $(SRCTREE)/nand_spl/nand_boot_fsl_elbc.c $@
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$(obj)/sdram.c:
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ln -sf $(SRCTREE)/board/$(BOARDDIR)/sdram.c $@
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$(obj)/$(BOARD).c:
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ln -sf $(SRCTREE)/board/$(BOARDDIR)/$(BOARD).c $@
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$(obj)/ns16550.c:
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ln -sf $(SRCTREE)/drivers/serial/ns16550.c $@
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$(obj)/spl_minimal.c:
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ln -sf $(SRCTREE)/arch/powerpc/cpu/mpc83xx/spl_minimal.c $@
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$(obj)/cache.c:
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ln -sf $(SRCTREE)/arch/powerpc/lib/cache.c $@
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$(obj)/time.c:
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ln -sf $(SRCTREE)/arch/powerpc/lib/time.c $@
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$(obj)/ticks.S:
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ln -sf $(SRCTREE)/arch/powerpc/lib/ticks.S $@
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