Date: 11 Oct 1999 11:43:29 +0000 From: Randell Jesup <rjesup@wgate.com> To: "Matthew N. Dodd" <winter@jurai.net> Cc: Gerard Roudier <groudier@club-internet.fr>, scsi@FreeBSD.ORG Subject: Re: Driver for GDT6517RD RAID controller Message-ID: <ybuu2ny15su.fsf@jesup.eng.tvol.net.jesup.eng.tvol.net> In-Reply-To: "Matthew N. Dodd"'s message of "Sat, 9 Oct 1999 23:54:18 -0400 (EDT)" References: <Pine.BSF.4.10.9910092344120.480-100000@sasami.jurai.net>
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"Matthew N. Dodd" <winter@jurai.net> writes:
>On 9 Oct 1999, Randell Jesup wrote:
>> Sure. In this case, if someone had docs on the bus interface for a
>> 710-based card, and people had some real use for a driver for them (I
>> don't know if that's true), it probably wouldn't be hard to modify an
>> '810 driver to support it. I didn't have any real plans to do so when
>I've taken a look at the NCR driver and my conclusion, outside of any SIM
>issues is that 2 things need to happen.
>
>1. The NCR driver needs to be converted to bus_space.
[snip]
>2. The NCR driver needs be converted to use newbus, not the legacy shims
> it is currently using.
[snip]
>If someone wants to start working on this I will make myself available for
>newbus related questions and will also provide EISA bus front ends for the
>various onboard and expansion 53c7xx based boards I've got laying around.
>
>Since the 53c[78]xx chips either have onboad PCI interfacing logic, or
>make use of fairly standard bus interface logic I don't think that the
>actual bus specific bits will be anything more than bus_space and
>attention to proper alignment.
So, it sounds like it's certainly doable with some (but not major)
effort.
Here's the question then (Gerard's question): is it worth doing?
Would anyone have a use for this? While of limited utility, it would
help me understand how a FreeBSD driver/SIM is put together.
The other possible thing I'm considering doing (since a couple of
the SIM's do have support for target-mode) is to build an IP transport
on top of CAM2/3 target mode. I suspect this is more useful, especially
for people building high-reliability servers (that was why DEC was so
interested in target mode; several of the other people on the target-mode
subcommittee were from DEC, and implemented target-mode for this purpose).
Very high speed (short-distance) networking.
--
Randell Jesup, Worldgate Communications, ex-Scala, ex-Amiga OS team ('88-94)
rjesup@wgate.com
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