From: Steven Scholz <steven.scholz@imc-berlin•de>
To: Steve Rossi <srossi@labs•mot.com>
Cc: Embedded Linux PPC List <linuxppc-embedded@lists•linuxppc.org>
Subject: Re: IDE DMA on 8xx ??
Date: Wed, 20 Mar 2002 13:17:47 +0100 [thread overview]
Message-ID: <3C987DEB.14F4E05A@imc-berlin.de> (raw)
In-Reply-To: 3C20E057.B9983C96@labs.mot.com
Hi Steve,
> Has anyone attempted to use the internal 8xx IDMA controller to do
> DMA to a IDE disk? I'm considering making an attempt at it, but I just
> want to hear first if anyone has tried already and if so what the
> experience is.
I did last summer. Well actually I tried. It wasn't too hard to use the
IDMA to transfer data from/to ide disk.
But at that time my code just started polling after setting up the dma.
So the cpu was busy waiting instead of doing something useful. But I
reckon it's not to hard to use irqs for signaling the end of DMA
transfer to the ide driver.
I noticed that the cycle time of the normal (i.e. two-address) IDMA mode
is huge. So the performance wasn't great.
I have to pick up that work again now.
So I wonder if you or anybody else has done something on this topic?
Thanks,
Steven
** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
prev parent reply other threads:[~2002-03-20 12:17 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-12-19 18:45 IDE DMA on 8xx ?? Steve Rossi
2002-03-20 12:17 ` Steven Scholz [this message]
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