[PATCH 1/2] powerpc/boot: Disable vector instructions

[Michael Ellerman]

Segher Boessenkool <segher at kernel.crashing.org> writes:
> On Thu, Oct 11, 2018 at 08:22:54AM +1030, Joel Stanley wrote:
>> On Wed, 10 Oct 2018 at 22:41, Michael Ellerman <mpe at ellerman.id.au> wrote:
>> > Joel Stanley <joel at jms.id.au> writes:
>> > >  BOOTCFLAGS    := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
>> > > -              -fno-strict-aliasing -Os -msoft-float -pipe \
>> > > -              -fomit-frame-pointer -fno-builtin -fPIC -nostdinc \
>> > > +              -fno-strict-aliasing -Os -msoft-float -mno-altivec -mno-vsx \
>> >
>> > That's going to break if the compiler doesn't understand -mno-vsx isn't it?
>> >
>> > I'm not sure if "support" a compiler that old though.
>> 
>> Segher, the kernel mandates 4.6 as the minimum. Do we need to worry
>> about the compiler not supporting  -mno-altivec -mno-vsx?
>
> -mvsx is gcc 4.5 and later.
> https://www.gnu.org/software/gcc/gcc-4.5/changes.html
>
> -maltivec is...  Hrm, not so easy to find...  gcc 3.1 and later it seems.
> https://www.gnu.org/software/gcc/gcc-3.1/changes.html

Thanks.

cheers