ultra5/cmd646 hang

Thomas Moestl t.moestl at tu-bs.de
Wed Nov 19 19:20:53 PST 2003

On Thu, 2003/11/20 at 04:11:50 +0100, Thomas Moestl wrote:
> I think I've found the reason for this; the attached patch works around it.
> The issue is that the chip does not set ATA_BMSTAT_INTERRUPT, even though
> it is DMA-capable. My hackaround is to add an interrupt handler for the
> CMD646 that does only check this bit if a DMA transfer is in progress,

I should add that this was observed on a rev. 3 CMD646 (aka CMD646U).

	- Thomas

Thomas Moestl <t.moestl at tu-bs.de>	http://www.tu-bs.de/~y0015675/
              <tmm at FreeBSD.org>		http://people.FreeBSD.org/~tmm/
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