Date: 08 Oct 1999 22:02:09 +0000 From: Randell Jesup <rjesup@wgate.com> To: "Matthew N. Dodd" <winter@jurai.net> Cc: scsi@FreeBSD.ORG Subject: Re: Driver for GDT6517RD RAID controller Message-ID: <ybuhfk14ila.fsf@jesup.eng.tvol.net.jesup.eng.tvol.net> In-Reply-To: "Matthew N. Dodd"'s message of "Fri, 8 Oct 1999 21:44:35 -0400 (EDT)" References: <Pine.BSF.4.10.9910082143270.480-100000@sasami.jurai.net>
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"Matthew N. Dodd" <winter@jurai.net> writes:
>On 8 Oct 1999, Randell Jesup wrote:
>> Are there docs on the differences, or at least on-line or available
>> docs on the 53c8xx chips? Weren't the x810's 710's with built-in PCI
>> bus support?
>
>Essentially. I was kind of hopeing you'd glance at the NCR driver and see
>if anything looked amiss. Spliting out the bus front ends isn't a big
>problem but I really don't have the cycles to wrap my head around the
>53c7xx docs ATM.
Ok, I'll glance at them. Forgive me if I end up shuddering; I've
seen some of their code before. I might end up rewriting it.... or at
least incorporating some of my ideas to minimize interrupts. (interrupting
the CPU for SCSI state changes: bad). For many IO's, I was able to take a
single interrupt (completion); few were more than 2 ints (one for
disconnect after a transfer (damn '710 processor can't do math), one for
completion - no ints for reselects, and I think none for disconnect
before any bytes are xferred - I forget.)
--
Randell Jesup, Worldgate Communications, ex-Scala, ex-Amiga OS team ('88-94)
rjesup@wgate.com
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