From: erik quanstrom <quanstro@quanstro.net>
To: 9fans@9fans.net
Subject: Re: [9fans] Bizarre freeze
Date: Tue, 5 Aug 2008 15:49:38 -0400 [thread overview]
Message-ID: <8c0e2e9fc0c571f3be800e7c21531f11@quanstro.net> (raw)
> > I wonder why there is a command to turn on DMA on disks. Could
> > it be that some disks don't work with DMA on?
> sure. it's PC hardware, so it's crap :-)
unfortunately, this isn't a pc hardware thing. pata
devices are not required to support dma. ata 7, which
is the first to include sata support, requires udma mode
5 support. (many sata:pata bridges violate this part of
the spec, e.g. sata doms.)
but i'm wondering if dma support isn't a red herring.
> sdC0 is a cdrom. I can turn dma on for my sata disks (sdE0/sdF0) no problem.
it could be that this is a chipset that advertizes sata and
pata pci devices concurrently, but only one may be accessed
by the operating system. some ich 7 chipsets fall into this
category.
does this also hang your machine?
echo probe|scuzz
if so, i would put some debugging in atapktio.
otherwise, it just might be a bug in sdata.c
- erik
next reply other threads:[~2008-08-05 19:49 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-05 19:49 erik quanstrom [this message]
-- strict thread matches above, loose matches on Subject: below --
2008-08-05 18:01 sqweek
2008-08-05 18:16 ` Sape Mullender
2008-08-05 18:26 ` ron minnich
2008-08-05 19:01 ` erik quanstrom
2008-08-07 10:17 ` matt
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