2018-09-13 11:51 GMT-04:00 Geert Uytterhoeven <geert at linux-m68k.org>: > Hi Yamada-san, > > On Wed, Sep 12, 2018 at 3:02 AM Masahiro Yamada > <yamada.masahiro at socionext.com> wrote: >> 2018-09-12 0:40 GMT+09:00 Rob Herring <robh at kernel.org>: >> > On Mon, Sep 10, 2018 at 10:04 AM Rob Herring <robh at kernel.org> wrote: >> >> There is nothing arch specific about building dtb files other than their >> >> location under /arch/*/boot/dts/. Keeping each arch aligned is a pain. >> >> The dependencies and supported targets are all slightly different. >> >> Also, a cross-compiler for each arch is needed, but really the host >> >> compiler preprocessor is perfectly fine for building dtbs. Move the >> >> build rules to a common location and remove the arch specific ones. This >> >> is done in a single step to avoid warnings about overriding rules. >> >> >> >> The build dependencies had been a mixture of 'scripts' and/or 'prepare'. >> >> These pull in several dependencies some of which need a target compiler >> >> (specifically devicetable-offsets.h) and aren't needed to build dtbs. >> >> All that is really needed is dtc, so adjust the dependencies to only be >> >> dtc. >> >> >> >> This change enables support 'dtbs_install' on some arches which were >> >> missing the target. >> > >> > [...] >> > >> >> @@ -1215,6 +1215,33 @@ kselftest-merge: >> >> $(srctree)/tools/testing/selftests/*/config >> >> +$(Q)$(MAKE) -f $(srctree)/Makefile olddefconfig >> >> >> >> +# --------------------------------------------------------------------------- >> >> +# Devicetree files >> >> + >> >> +ifneq ($(wildcard $(srctree)/arch/$(SRCARCH)/boot/dts/),) >> >> +dtstree := arch/$(SRCARCH)/boot/dts >> >> +endif >> >> + >> >> +ifdef CONFIG_OF_EARLY_FLATTREE >> > >> > This can be true when dtstree is unset. So this line should be this >> > instead to fix the 0-day reported error: >> > >> > ifneq ($(dtstree),) >> > >> >> + >> >> +%.dtb : scripts_dtc >> >> + $(Q)$(MAKE) $(build)=$(dtstree) $(dtstree)/$@ >> >> + >> >> +PHONY += dtbs dtbs_install >> >> +dtbs: scripts_dtc >> >> + $(Q)$(MAKE) $(build)=$(dtstree) >> >> + >> >> +dtbs_install: dtbs >> >> + $(Q)$(MAKE) $(dtbinst)=$(dtstree) >> >> + >> >> +all: dtbs >> >> + >> >> +endif >> >> >> Ah, right. >> Even x86 can enable OF and OF_UNITTEST. >> >> >> >> Another solution might be, >> guard it by 'depends on ARCH_SUPPORTS_OF'. >> >> >> >> This is actually what ACPI does. >> >> menuconfig ACPI >> bool "ACPI (Advanced Configuration and Power Interface) Support" >> depends on ARCH_SUPPORTS_ACPI >> ... > > ACPI is a real platform feature, as it depends on firmware. > > CONFIG_OF can be enabled, and DT overlays can be loaded, on any platform, > even if it has ACPI ;-) > OK, understood. Thanks! -- Best Regards Masahiro Yamada
