Subject: Re: Quadra AV SCSI DMA Code
To: Michael R.Zucca <mrz5149@acm.org>
From: Henry B. Hotz <hotz@jpl.nasa.gov>
List: port-mac68k
Date: 06/08/2003 18:33:55
At 8:32 PM -0400 6/8/03, Michael R.Zucca wrote:
>3. Do un-16-byte-aligned transfers under 4k by copying the data 
>to/from a pre-allocated and aligned transfer buffer. This will help 
>solve the sync negotiation problem by boiling it down to figuring 
>out how to do odd-sized transfers that appear to be completely DMA.
>4. Figure out a way to do odd-sized reads/writes that will satisfy 
>the sync negotiation code.

Doesn't most of the disk IO occur in 512-byte increments from 
page-aligned buffers?
-- 
The opinions expressed in this message are mine,
not those of Caltech, JPL, NASA, or the US Government.
Henry.B.Hotz@jpl.nasa.gov, or hbhotz@oxy.edu