Subject: Re: esp problem (sun3x)
To: Izumi Tsutsui <email@example.com>
From: Gordon W. Ross <firstname.lastname@example.org>
Date: 04/05/1999 10:48:18
Izumi Tsutsui writes:
> email@example.com wrote:
> > > Did you set ncr53c9x_dmaselect = 1 in arch/sun3/dev/esp.c?
> > Yes, I wanted to try to get that working. The sun3x code is
> > now basically the same as the sparc is using, but no luck.
> > Have any idea what it might take to make DMA select work?
> Well, I guess that ncr53c9x_dmaselect should be set
> *after* ncr53c9x_attach().
I did that. The code I'm using is identical to the sparc version
(as much as possible) but DMA seems to complete with an interrupt
after a single byte of a seven byte transfer, and then refuses to
send any more. (See the debug trace sent previously).
Looking for clues... This is an old, REV zero DMA chip, btw.