Le 28/08/2022 à 19:33, Christophe Leroy a écrit :
>
>
> Le 28/08/2022 à 11:56, Pali Rohár a écrit :
>> When CONFIG_TARGET_CPU is specified then pass its value to the compiler
>> -mcpu option. This fixes following build error when building kernel with
>> powerpc e500 SPE capable cross compilers:
>>
>> 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
>
> corenet64_smp_defconfig :
>
> BOOTAS arch/powerpc/boot/crt0.o
> powerpc64-linux-gcc: error: missing argument to '-mcpu='
> make[1]: *** [arch/powerpc/boot/Makefile:237 : arch/powerpc/boot/crt0.o]
> Erreur 1
> make: *** [arch/powerpc/Makefile:253 : uImage] Erreur 2
>
>
Seems like in fact, E5500_CPU and E6500_CPU are not taken into account
in CONFIG_TARGET_CPU, and get special treatment directly in
arch/powerpc/Makefile.
This goes unnoticed because of CFLAGS-$(CONFIG_TARGET_CPU_BOOL) +=
$(call cc-option,-mcpu=$(CONFIG_TARGET_CPU))
I think we need to fix that prior to your patch.
> Christophe
>
>
>>
>> Similar change was already introduced for the main powerpc Makefile in
>> commit 446cda1b21d9 ("powerpc/32: Don't always pass -mcpu=powerpc to the
>> compiler").
>>
>> Fixes: 40a75584e526 ("powerpc/boot: Build wrapper for an appropriate
>> CPU")
>> Cc: sta...@vger.kernel.org # 446cda1b21d9 ("powerpc/32: Don't always
>> pass -mcpu=powerpc to the compiler")
>> Signed-off-by: Pali Rohár <p...@kernel.org>
>> ---
>> arch/powerpc/boot/Makefile | 14 ++++++++++----
>> 1 file changed, 10 insertions(+), 4 deletions(-)
>>
>> diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile
>> index a9cd2ea4a861..1957a3de7a1c 100644
>> --- a/arch/powerpc/boot/Makefile
>> +++ b/arch/powerpc/boot/Makefile
>> @@ -38,13 +38,19 @@ BOOTCFLAGS := -Wall -Wundef -Wstrict-prototypes
>> -Wno-trigraphs \
>> $(LINUXINCLUDE)
>> ifdef CONFIG_PPC64_BOOT_WRAPPER
>> -ifdef CONFIG_CPU_LITTLE_ENDIAN
>> -BOOTCFLAGS += -m64 -mcpu=powerpc64le
>> +BOOTCFLAGS += -m64
>> else
>> -BOOTCFLAGS += -m64 -mcpu=powerpc64
>> +BOOTCFLAGS += -m32
>> endif
>> +
>> +ifdef CONFIG_TARGET_CPU_BOOL
>> +BOOTCFLAGS += -mcpu=$(CONFIG_TARGET_CPU)
>> +else ifdef CONFIG_PPC64_BOOT_WRAPPER
>> +ifdef CONFIG_CPU_LITTLE_ENDIAN
>> +BOOTCFLAGS += -mcpu=powerpc64le
>> else
>> -BOOTCFLAGS += -m32 -mcpu=powerpc
>> +BOOTCFLAGS += -mcpu=powerpc64
>> +endif
>> endif
>> BOOTCFLAGS += -isystem $(shell $(BOOTCC) -print-file-name=include)
