[PATCH 4/8] 8xx: Fixup DAR from buggy dcbX instructions.
scottwood at freescale.com
Thu Oct 15 07:22:25 EST 2009
Joakim Tjernlund wrote:
> Scott Wood <scottwood at freescale.com> wrote on 14/10/2009 21:23:02:
>> Joakim Tjernlund wrote:
>>> BTW, you could add a test and printk in do_page_fault on address 0x000000f0.
>>> if that ever hits there is a problem with dcbX fixup.
>> It doesn't get any 0xf0 faults.
>> FWIW, I'm not seeing the segfault any more, but I still get the lockup.
> Have you reverted
> 8xx: start using dcbX instructions in various copy routines ?
> After that you could stick a
> b DataAccess
> directly in the DTLB error handler to skip and dcbX fixups.
With that, I don't see the hard lockup, but things get stuck during
bootup with everything idle. I see this even if I revert everything but
the "invalidate non present TLBs" patch, and I was seeing similar things
sometimes with the other tlbil_va hacks.
I think there's something else going on in the 2.6 8xx code that needs
to be fixed before we can tell what the impact of these patches is.
I'll look into it.
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