Subject: Re: bus_dma back-end for Shark
To: Todd Vierling <tv@pobox.com>
From: Jason Thorpe <thorpej@nas.nasa.gov>
List: port-arm32
Date: 06/29/1998 10:43:26
On Mon, 29 Jun 1998 10:28:11 -0400 (EDT)
Todd Vierling <tv@pobox.com> wrote:
> Mmm! The Shark uses a MD version of the sequoia driver; does the MI version
> of that one work as well?
Err, the Sequoia is the core logic chip... That is going to be MD by its
very nature :-)
The CS8900 driver is NOT yet MI, but it is using the MI isadma code to
do its work (err, in my tree, that is :-)
> : There are still a few buglets, in particular the old Shark isadma driver
> : programs loop mode differently than the MI driver does, and I think that
> : might be causing me some problems... but after a half-day's hacking, this
> : isn't too bad, and it will allow us to use the new ESS driver when Lennart
> : is finished with it :-)
...and, FWIW, I fixed this by adding a new LOOPDEMAND mode to the MI
isadma driver :-)
> The sb driver can be used in the meantime, as the ess can be used as a
> sb-clone.... (what does the ess offer over sb in its "native" mode?)
Oh, ok... I'll add an sb_ofisa, then, and then eventually we can add
an ess_ofisa which returns a higher match priority than sb_ofisa.
I don't honestly know what an ESS native mode offers over SB emulation.
Jason R. Thorpe thorpej@nas.nasa.gov
NASA Ames Research Center Home: +1 408 866 1912
NAS: M/S 258-5 Work: +1 650 604 0935
Moffett Field, CA 94035 Pager: +1 650 428 6939