From owner-freebsd-scsi Mon Oct 11 8:48:12 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 BAFA7150AF for ; Mon, 11 Oct 1999 08:48:08 -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 LAA24324; Mon, 11 Oct 1999 11:43:37 -0400 (EDT) Reply-To: Randell Jesup To: "Matthew N. Dodd" Cc: Gerard Roudier , scsi@FreeBSD.ORG Subject: Re: Driver for GDT6517RD RAID controller References: From: Randell Jesup Date: 11 Oct 1999 11:43:29 +0000 In-Reply-To: "Matthew N. Dodd"'s message of "Sat, 9 Oct 1999 23:54:18 -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 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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-scsi" in the body of the message