[U-Boot] [PATCH] kbuild,tegra124: add dummy obj- for Kbuild

[Masahiro Yamada]

Hello Stephen,

> >>
> >> Adding something to obj-, which presumably isn't used at all, seems very
> >> odd.
> > 
> > Why do we even need arch/arm/cpu/armv7/tegra124/Makefile ?  I assume we
> > need the config.mk because we can't stick CONFIG_ARCH_DEVICE_TREE into
> > the config header?
> 
> At least with the current build system, if I delete it, the build fails:
> 
> > + make BUILD_DIR=/home/swarren/shared/git_wa/tegra-uboot-flasher/_build/venice2/u-boot -s -j9
> > /home/swarren/shared/git_wa/tegra-uboot-flasher/u-boot/scripts/Makefile.build:11: Makefile: No such file or directory
> > make[1]: *** No rule to make target `Makefile'.  Stop.
> > make: *** [/home/swarren/shared/git_wa/tegra-uboot-flasher/_build/venice2/u-boot/arch/arm/cpu/armv7/tegra124/built-in.o] Error 2

Yes, we can't delete the Makefile. (This is the same as before Kbuild.)

Venice2 board specify SoC name, tegra124 in boards.cfg.
If $(SOC) is not empty, the build system will descend into the SoC
directory, and Makefile always must be there.

I understand the special situation for Tegra, which has a different CPU
for SPL.

I guess you want to build under arch/arm/cpu/arm720t/tegra124/ for SPL,
whereas there is nothing to build under arch/arm/cpu/armv7/tegra124/.



Best Regards
Masahiro Yamada