From: jmk@plan9.bell-labs.com
To: 9fans@cse.psu.edu
Subject: Re: [9fans] Bug Report. Maybe DMA race on Abit BX6
Date: Wed, 20 Aug 2003 15:01:08 -0400 [thread overview]
Message-ID: <59b50c09ea943819b1eab81b3053c57f@plan9.bell-labs.com> (raw)
In-Reply-To: <Pine.LNX.4.44.0308201249150.32150-100000@fbsd.cpsc.ucalgary.ca>
On Wed Aug 20 14:53:28 EDT 2003, mirtchov@cpsc.ucalgary.ca wrote:
> On Wed, 20 Aug 2003, Carl-Johan Kjellander wrote:
>
> > So there is a bug in the dma-handling for the Abit BX6 motherboard.
> >
>
> according to jmk, if there was a bug in the dma code, data corruption
> would be the most likely effect. however i've suffered only from race
> conditions in fossil with dma on
>
> andrey
The manifestation of DMA not being properly set up can range from
subtle data corruption to system hangs. The problem is almost always
caused by the BIOS setting the drive to a different DMA mode than
that set in the controller-dependent registers. Plan 9 currently
assumes the BIOS doesn't make that mistake, and that is why DMA
should never be enabled unless you are sure it will work OK. The
driver should someday be able to do this check and configure the
hardware correctly.
next prev parent reply other threads:[~2003-08-20 19:01 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-20 18:36 Carl-Johan Kjellander
2003-08-20 18:52 ` andrey mirtchovski
2003-08-20 19:01 ` jmk [this message]
-- strict thread matches above, loose matches on Subject: below --
2003-08-20 17:47 Carl-Johan Kjellander
2003-08-20 17:53 ` andrey mirtchovski
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