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SubjectRe: 2.6.13.1 locks machine after some time, 2.6.12.5 work fine
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On Tue, 2005-09-13 at 10:23 -0700, Linus Torvalds wrote:
>
> On Tue, 13 Sep 2005, Norbert Kiesel wrote:
> >
> > Ok, I applied the patch and I'm running it right now, so far so good.
> > Here is the the output of lspci from the patched 2.6.13.1 (not sure if a
> > diff to the unpatched 2.6.13.1 or the 2.6.12.5 would be more useful, so
> > I settled for no diff :-).
>
> Yes, now it looks better, except for a lspci quirk. You have:
>
> > 0000:00:10.0 RAID bus controller: Silicon Image, Inc. SiI 0649
> > Ultra ATA/100 PCI to ATA Host Controller (rev 01)
>
> and lspci reports:
>
> > Expansion ROM at 40000000 [disabled] [size=512K]
>
> where the "disabled" comes from the fact that it looks at the sysfs data
> structures, and the resource is indeed marked as disabled there (because
> nothing enabled it explicitly).
>
> But then reading the HW registers, we see:
>
> > 30: 01 00 00 40 60 00 00 00 00 00 00 00 0c 01 02 04
>
> Ie now the ROM address value is 0x40000001, which means that as far as the
> _hardware_ is concerned, the ROM is actually enabled.
>
> That's because the cmd64x driver enabled the ROM by just writing the
> enable bit directly, and never actually told the resource layer that it
> had done so. Not a big deal - we've properly allocated the resource
> region, so there's no overlap, there's just this strange disconnect
> between what the hardware thinks and what the resource handling things.
>
> Anyway, it all looks reasonable. Of course, exactly like with the hpt
> driver, there doesn't seem to be any real _reason_ to enable the ROM in
> the first place, and that code is #ifdef __i386__ anyway (so if there
> _was_ a reason, it wouldn't work on anything else than an x86), so I
> suspect we should just remove the ROM enable entirely.
>
> But it really shouldn't matter - at least we now enable the ROM
> _correctly_, and I'm pretty sure (and certainly sincerely hope ;) that
> your lockup is gone.
>
> Linus
>

Hi,
system is stable again (I'm way beyond the point where I got lockups
before). Thanks a bunch for the quick fix! I'd recommend to include
this patch in 2.6.13.2.

Best,
Norbert

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