From owner-freebsd-smp Wed Jul 16 04:08:37 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.5/8.8.5) id EAA04964 for smp-outgoing; Wed, 16 Jul 1997 04:08:37 -0700 (PDT) Received: from spinner.dialix.com.au (spinner.dialix.com.au [192.203.228.67]) by hub.freebsd.org (8.8.5/8.8.5) with ESMTP id EAA04951 for ; Wed, 16 Jul 1997 04:08:29 -0700 (PDT) Received: from spinner.dialix.com.au (localhost.dialix.com.au [127.0.0.1]) by spinner.dialix.com.au with ESMTP id TAA15825; Wed, 16 Jul 1997 19:08:01 +0800 (WST) Message-Id: <199707161108.TAA15825@spinner.dialix.com.au> X-Mailer: exmh version 2.0delta 6/3/97 To: Steve Passe cc: smp@FreeBSD.ORG Subject: Re: HEADS UP: EISA cards. In-reply-to: Your message of "Tue, 15 Jul 1997 23:51:00 CST." <199707160551.XAA06975@Ilsa.StevesCafe.com> Date: Wed, 16 Jul 1997 19:08:00 +0800 From: Peter Wemm Sender: owner-smp@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk Steve Passe wrote: > ... > I believe that we don't want to abandon the 8254, but instead should > abandon the DMA chaining INTs (who uses these anyways???) Then we > can program in a similar way, but instead pass the 8254 INT thru as > a regular INT. > ... > we need to make a policy decision as to whether we can say > bye-bye to the DMA chaining INTs. If I don't get thoughtful feedback on this > I will just nmake an arbitrary decision (which I suspect to be axing the DMA > INTs). I think the only situation needing them is non-busmaster EISA hardwar e > that does DMA via the motherboard chipset DMA registers. Please correct me > if I am wrong on this point. I believe, that we don't support the DMA chaining interrupt in any way, shape or form at present. I would not think it would be a big loss. I think you are correct, it's only used for motherboard driven DMA. Busmastering DMA (any EISA card worth using would do this anyway) is unrelated to that. I vote for declaring it stillborn, especially as EISA is apparently not on the "cool hardware of the day" list. Cheers, -Peter