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From: Segher Boessenkool <segher@kernel.crashing.org>
Subject: Re: 440 ebony patch seems to have broken 85xx build on powerpc.git
Date: Thu, 24 May 2007 21:05:28 +0200
To: Dave Jiang <djiang@mvista.com>
Cc: linuxppc-dev@ozlabs.org
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> $(obj)/44x.o: BOOTCFLAGS += -Wa,-mbooke
> $(obj)/ebony.o: BOOTCFLAGS += -Wa,-mbooke

Probably -Wa,-m440 works better.  However...

>   /opt/montavista/cge/devkit/ppc/85xx/bin/ppc_85xx-gcc -m32
> -Wp,-MD,arch/powerpc/boot/.ebony.o.d -Wall -Wstrict-prototypes -O2
> -fomit-frame-pointer -fno-builtin -nostdinc -isystem
> /opt/montavista/cge/devkit/ppc/85xx/bin/../lib/gcc/powerpc-montavista- 
> linux-gnuspe/4.2.0/include
> -fPIC -fno-stack-protector -Iarch/powerpc/boot
> -I/home/djiang/community/git-repos/tmp/ppc-master/arch/powerpc/boot  
> -Wa,-mbooke
> -c -o arch/powerpc/boot/ebony.o arch/powerpc/boot/ebony.c

Nothing is telling GCC what CPU to compile for, so it
will just use the compiler's default, which very likely
is not what you want.  For files that will only ever
be used on 440, the correct flags are -mcpu=440 -Wa,-m440 .


Segher