On 7/21/07, Adrian McMenamin <[email protected]> wrote:
On 21/07/07, Peter Bortas <[email protected]> wrote:
>
> Sidenote: Does Linux handle the Dreamcast DMA errata?
>
You need to explain what you mean (at least to me!).
If you mean will it degrade gracefully - not without this patch if set
to the (correct) defconfig. With iffy settings it will.
If I remember correctly (and that's a big if since I last looked at it
in 2001) some revisions of the Dreamcast hardware would sporadically
lock up if you scheduled a new DMA request to quickly after a previous
one, even if you checked the ready bit. It's worked around by a delay
of X microseconds as recommended by Sega engineers. I don't remember
the value of X, nor where exactly in the flow this workaround should
be applied.
Adding Marcus in case he has a better memory than me.
--
Peter Bortas
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