Messages in this thread | | | Date | Sat, 27 Aug 2022 20:36:08 +0200 | From | Pali Rohár <> | Subject | Re: [PATCH v2] powerpc/boot: Don't always pass -mcpu=powerpc when building 32-bit uImage |
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On Saturday 27 August 2022 18:32:42 Christophe Leroy wrote: > Le 27/08/2022 à 19:36, Pali Rohár a écrit : > > On Saturday 27 August 2022 17:31:10 Christophe Leroy wrote: > >> Le 27/08/2022 à 15:39, Pali Rohár a écrit : > >>> For 32-bit uImage try to use CONFIG_TARGET_CPU option for -mcpu. This fixes > >>> following compiler 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 > >>> > >>> For 64-bit uImage and 64-bit kernels with 32-bit uImage wrapper there is no > >>> change. > >>> > >>> 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: stable@vger.kernel.org > >>> Signed-off-by: Pali Rohár <pali@kernel.org> > >>> --- > >>> arch/powerpc/boot/Makefile | 8 ++++++++ > >>> 1 file changed, 8 insertions(+) > >>> > >>> diff --git a/arch/powerpc/boot/Makefile b/arch/powerpc/boot/Makefile > >>> index a9cd2ea4a861..f56a5f90a5d8 100644 > >>> --- a/arch/powerpc/boot/Makefile > >>> +++ b/arch/powerpc/boot/Makefile > >>> @@ -44,8 +44,16 @@ else > >>> BOOTCFLAGS += -m64 -mcpu=powerpc64 > >>> endif > >>> else > >>> +ifdef CONFIG_PPC32 > >>> +ifdef CONFIG_TARGET_CPU_BOOL > >>> +BOOTCFLAGS += -m32 -mcpu=$(CONFIG_TARGET_CPU) > >>> +else > >>> +BOOTCFLAGS += -m32 -mcpu=powerpc > >> > >> You can't do that. You get here only if user has selected > >> TOOLCHAIN_DEFAULT_CPU, in which case you don't want to for -mcpu=powerpc. > > > > So do I understand it correctly that in this branch I should omit -mcpu=powerpc? > > Correct.
Ok, I will fix it in v3.
> > > >> -mcpu=powerpc is set when user selects CONFIG_POWERPC_CPU, in which case > >> CONFIG_TARGET_CPU_BOOL is set as well. > >> > >>> +endif > >>> +else > >>> BOOTCFLAGS += -m32 -mcpu=powerpc > >> > >> Same, for PPC64 I think you don't want that either, unless the > >> CONFIG_GENERIC_CPU has been selected in which case > >> CONFIG_TARGET_CPU_BOOL is not set. > >> > >> When CONFIG_TARGET_CPU_BOOL is set for PPC64 you also want > >> -mcpu=$(CONFIG_TARGET_CPU) > > > > I understand that this branch is called for PPC64 build with 32-bit > > uImage wrapper. So in this case should not be used TARGET_CPU as it > > would be 64-bit and not 32-bit as requited for 32-bit uImage wrapper. > > Why ? > > -mcpu=e6500 -m32 works as far as I can see.
Hm... I did not know that. Ok, if you want I will put it into -m32 -mcpu=$(CONFIG_TARGET_CPU) branch too.
> > > > Anyway, in this change I'm touching only PPC32 build, so all PPC64 stay > > as it was before. > > > >>> endif > >>> +endif > >>> > >>> BOOTCFLAGS += -isystem $(shell $(BOOTCC) -print-file-name=include) > >>>
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