Re: MIPS - 64bit woes

[Kumba <kumba@gentoo.org>]

Jim Gifford wrote:
> Here is what I did to track down the errors.
> 
> I created a diff between the last working kernel 2.6.12 and the current 
> kernel. Started with cpu-probe.c, that to me seemed the logical choice.
> 
> After patching the rest of files needed to support the patch in 
> cpu-probe.c, I was finally able to produce a kernel under 2.6.12 with 
> the same problem.
> 
> The files that I ported from 2.6.14 to 2.6.12 are the following
> cpu-probe.c
> cpu.h
> mipsregs.h
> cache.c
> cpu-features.h
> 
> Here is a link to the patches I used http://ftp.jg555.com/errors
> 
> Looking at mipsregs.h, something doesn't look right for a 64 bit system. 
> But I'm not the expert.
> 
> Here are my findings, I hope someone out there has an idea.

Stanislaw pretty much figured it out last night.

See the if statement in the 'void __init cpu_cache_init(void)' function in 
arch/mips/mm/cache.c.  IP30, IP27, and cobalt didn't define the appropriate 
cache type in cpu-features.h, thus failed that check and panicked.  I believe 
it's fixed in the newest IP30 patches, of which I have yet to take a look at.


--Kumba

-- 
Gentoo/MIPS Team Lead
Gentoo Foundation Board of Trustees

"Such is oft the course of deeds that move the wheels of the world: small hands 
do them because they must, while the eyes of the great are elsewhere."  --Elrond