From owner-freebsd-scsi Fri Oct 8 19: 7: 5 1999 Delivered-To: freebsd-scsi@freebsd.org Received: from mail.tvol.com (mail.wgate.com [38.219.83.4]) by hub.freebsd.org (Postfix) with ESMTP id 8C135152CC for ; Fri, 8 Oct 1999 19:07:01 -0700 (PDT) (envelope-from rjesup@wgate.com) Received: from jesup.eng.tvol.net (jesup.eng.tvol.net [10.32.2.26]) by mail.tvol.com (8.8.8/8.8.3) with ESMTP id WAA09285; Fri, 8 Oct 1999 22:02:08 -0400 (EDT) Reply-To: Randell Jesup To: "Matthew N. Dodd" Cc: scsi@FreeBSD.ORG Subject: Re: Driver for GDT6517RD RAID controller References: From: Randell Jesup Date: 08 Oct 1999 22:02:09 +0000 In-Reply-To: "Matthew N. Dodd"'s message of "Fri, 8 Oct 1999 21:44:35 -0400 (EDT)" Message-ID: X-Mailer: Gnus v5.6.43/Emacs 20.4 Sender: owner-freebsd-scsi@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org "Matthew N. Dodd" 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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message