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SubjectRe: [PATCH] powerpc/boot: Fix compilation of uImage for e500 platforms
On Tuesday 23 August 2022 16:57:34 Christophe Leroy wrote:
> Le 20/08/2022 à 12:52, Pali Rohár a écrit :
> > Commit 40a75584e526 ("powerpc/boot: Build wrapper for an appropriate CPU")
> > broke compilation of uImage target for mpc85xx platforms by powerpc e500
> > SPE capable cross compilers. After that commit build process throws error:
> >
> > BOOTAS arch/powerpc/boot/crt0.o
> > powerpc-linux-gnuspe-gcc: error: unrecognized argument in option ‘-mcpu=powerpc’
> > powerpc-linux-gnuspe-gcc: note: valid arguments to ‘-mcpu=’ are: 8540 8548 native
> > make[1]: *** [arch/powerpc/boot/Makefile:231: arch/powerpc/boot/crt0.o] Error 1
> >
> > Fix this issue by checking for CONFIG_PPC_E500MC / CONFIG_E500 options and
> > applying appropriate -mcpu options for building uImage boot code.
>
> This is very specific to e500, could you instead do something using
> CONFIG_TARGET_CPU, just like commit 446cda1b21d9 ("powerpc/32: Don't
> always pass -mcpu=powerpc to the compiler")

Ok, What about this change?

diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
index a9cd2ea4a861..2247374c4e70 100644
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -34,6 +34,7 @@ endif

BOOTCFLAGS := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
-fno-strict-aliasing -O2 -msoft-float -mno-altivec -mno-vsx \
+ $(call cc-option,-mno-spe) $(call cc-option,-mspe=no) \
-pipe -fomit-frame-pointer -fno-builtin -fPIC -nostdinc \
$(LINUXINCLUDE)

@@ -44,8 +45,16 @@ else
BOOTCFLAGS += -m64 -mcpu=powerpc64
endif
else
+ifdef CONFIG_PPC32
+ifdef CONFIG_TARGET_CPU_BOOL
+BOOTCFLAGS += -m32 -mcpu=$(CONFIG_TARGET_CPU)
+else
+BOOTCFLAGS += -m32 -mcpu=powerpc
+endif
+else
BOOTCFLAGS += -m32 -mcpu=powerpc
endif
+endif

BOOTCFLAGS += -isystem $(shell $(BOOTCC) -print-file-name=include)


> Thanks
> Christophe
>
>
> >
> > Fixes: 40a75584e526 ("powerpc/boot: Build wrapper for an appropriate CPU")
> > Cc: stable@vger.kernel.org
> > Signed-off-by: Pali Rohár <pali@kernel.org>
> > ---
> > arch/powerpc/boot/Makefile | 6 ++++++
> > 1 file changed, 6 insertions(+)
> >
> > diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
> > index a9cd2ea4a861..d7cf5d87e4bc 100644
> > --- a/arch/powerpc/boot/Makefile
> > +++ b/arch/powerpc/boot/Makefile
> > @@ -44,8 +44,14 @@ else
> > BOOTCFLAGS += -m64 -mcpu=powerpc64
> > endif
> > else
> > +ifdef CONFIG_PPC_E500MC
> > +BOOTCFLAGS += -m32 $(call cc-option,-mcpu=e500mc,-mcpu=powerpc)
> > +else ifdef CONFIG_E500
> > +BOOTCFLAGS += -m32 $(call cc-option,-mcpu=8540 -msoft-float,-mcpu=powerpc)
> > +else
> > BOOTCFLAGS += -m32 -mcpu=powerpc
> > endif
> > +endif
> >
> > BOOTCFLAGS += -isystem $(shell $(BOOTCC) -print-file-name=include)
> >

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