Messages in this thread | | | From | Andi Kleen <> | Subject | Re: 2.6.22-rc1 does not boot on VIA C3_2 cause of X86_CMPXCHG64 | Date | Thu, 17 May 2007 13:51:34 +0200 |
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On Thursday 17 May 2007 02:42, Dave Jones wrote: > On Thu, May 17, 2007 at 02:09:16AM +0200, Christian wrote: > > my small VIA C3_2 box does not boot with 2.6.22-rc1. > > It even does not uncompress the kernel. > > > > The configuration as M386 M486 works. But M586 + MVIAC3_2 > > does not work. > > > > solution for me, cahnge arch/i386/Kconfig.cpu > > > > --- arch/i386/Kconfig.cpu.before 2007-05-17 01:38:26.000000000 +0200 > > +++ arch/i386/Kconfig.cpu 2007-05-17 00:54:52.000000000 +0200 > > @@ -299,5 +299,5 @@ > > > > config X86_CMPXCHG64 > > bool > > - depends on !M386 && !M486 > > + depends on !M386 && !M486 && !MVIAC3_2 > > default y > > > > > > The related #ifdef is in ./include/asm-i386/cmpxchg.h > > May be cmpxchg8b is not supported by VIAC3_2 ? > > > > May be some other non Intel/AMD need to be excluded from X86_CMPXCHG64 ? > > May be the generic option CONFIG_X86_GENERIC need to switch this off > > also ? > > The C3s all have cx8, but it needs to be enabled in an MSR first. > (See arch/i386/kernel/cpu/centaur.c , search for CX8)
Sigh. I wonder what genius at VIA came up with that setup.
> Did we add code that uses cmpxchg8b before identify_cpu() gets run ? > I've not been paying attention to .22rc (busy trying to beat .21 into shape > for F7) so I may have missed something obvious. Andi?
That would be a bit complicated in pure asm code. It's probably best to just not require it as in Christian's patch above. Without SMP support it is not particularly needed anyways; a irq disabling emulation should work.
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