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Date: Thu, 26 Apr 2012 14:43:48 +0200
From: Kristof Provost <kristof@sigsegv.be>
To: Ian Lepore <freebsd@damnhippie.dyndns.org>
Message-ID: <20120426124347.GL46643@thebe.jupiter.sigsegv.be>
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Cc: freebsd-arm@freebsd.org
Subject: Re: arm/158950: arm/sheevaplug fails fsx when mmap operations are
 enabled
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On 2012-04-25 08:34:34 (-0600), Ian Lepore <freebsd@damnhippie.dyndns.org> wrote:
> Whenever I run into IO corruption that comes in 32-byte chunks I
> immediately suspect trouble in the busdma cacheline flush code.  A
> useful first step in narrowing that down is to change the data cache
> from write-back to write-through mode and see if the symptoms change.  I
> think for a sheeva cpu you'd do that in pmap_pte_init_arm10() in
> sys/arm/arm/pmap.c.  Change the xxx_cache_mode vars to be the same as
> they are in the pmap_pte_init_arm9() function just above it.
> 
I've had to disable it in pmap_pte_init_generic() rather than
pmap_pte_init_arm10(), but that does seem to prevent the corruption.

Regards,
Kristof