Re: Definitive Cyrix patch #3

Andrew Walker (
Fri, 6 Dec 1996 10:53:51 +0100 (MET)

Mike Jagdis wrote:
> This is version 3 of the Cyrix patch. It is against 2.1.7 (or so)
> but should patch cleanly against later 2.1s from reading the
> patches (other than Documentation/
> This adds some optional tweaking of performance features on
> the 6x86 and, completely new in this patch, the 5x86. If you
> enable the VSPM option for the 6x86 it works around the known
> wierdness.
> I have a couple of reports that a revision 4 6x86 sometimes
> freezes. I suspect this a problem with suspend on halt but
> have not been able to confirm it yet. If you have this problem
> try deleting the half dozen lines in arch/i386/kernel/head.S
> that set SUSP_HLT and let me know if it works.
> All other bugs are currently unknown so tell me about them :-).
> Mike

Okay, here's a point of reference

Motherboard: SOYP 5TF5 (Triton 430HX, 512kb pipeline cache)
Award BIOS
Processor: Cyrix 6x86 166+, rev 1, step 7
Ram: 2 x 16MB 60ns EDO

I've been recompiling a few kernels and getting trouble with
the dreaded gcc fatal errors, but with signal 4 (SIGILL) rather
than 11 (SIGSEGV). The Cyrix patch seemed to aggravate the
condition (died 4 or 5 times in a compile rather than once).
Also, with the Cyrix patch fully enabled I can't reboot into
Win95 (no flames please :), it just gets into a loop rebooting
itself and I have to switch the machine off.

I de-tuned the BIOS from 60ns RAM settings to 70ns RAM settings
and diasabled all but the processor identification and things
look fine at the moment.


Andy Walker                              Kvaerner Engineering a.s.        P.O. Box 222, N-1324 Lysaker, Norway

......if the answer isn't violence, neither is your silence......

(pwei barmy army - oslo "filial")