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Date: Wed, 26 Mar 2008 15:57:32 -0500
From: Josh Boyer <jwboyer@linux.vnet.ibm.com>
To: Roland McGrath <roland@redhat.com>
Subject: Re: PPC upstream kernel ignored DABR bug
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Cc: Arnd Bergmann <arnd@arndb.de>, Jan, linuxppc-dev@ozlabs.org,
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On Wed, 12 Mar 2008 18:47:45 -0700 (PDT)
Roland McGrath <roland@redhat.com> wrote:
 
> The only machine I have at home for testing powerpc is an Apple G5,
> supplied to me by IBM.  It says:
> 	cpu             : PPC970FX, altivec supported
> 	revision        : 3.0 (pvr 003c 0300)
> so I am guessing this document applies to the chips I have.  Since I can't
> test on other chips myself, it is plausible from what I've seen that there
> is no mysterious kernel problem and only this hardware problem.  The
> description of the hardware problem would not make me think that it would
> behave this way, but it is not very detailed or precise, or at least does
> not seem so to a reader not expert on powerpc.

I ran the testcase on my older G5 today with:

cpu             : PPC970, altivec supported
revision        : 2.2 (pvr 0039 0202)

and it also failed after a few iterations.  This was with
2.6.25-0.121.rc5.git4.fc9 as the kernel, which is fairly close to mainline.  At the least, this doesn't seem to be 970FX related.  I'll try building a vanilla 2.6.25-rc7 later this evening to see if that makes a difference.

josh