From owner-freebsd-current Thu May 28 17:22:28 1998 Return-Path: Received: (from majordom@localhost) by hub.freebsd.org (8.8.8/8.8.8) id RAA02764 for freebsd-current-outgoing; Thu, 28 May 1998 17:22:28 -0700 (PDT) (envelope-from owner-freebsd-current@FreeBSD.ORG) Received: from digger1.defence.gov.au (digger1.defence.gov.au [203.5.217.4]) by hub.freebsd.org (8.8.8/8.8.8) with ESMTP id RAA02674 for ; Thu, 28 May 1998 17:22:03 -0700 (PDT) (envelope-from Matthew.Thyer@dsto.defence.gov.au) Received: from exchsa1.dsto.defence.gov.au (exchsa1.dsto.defence.gov.au [131.185.2.94]) by digger1.defence.gov.au (8.7.5/8.7.3) with ESMTP id IAA11734; Fri, 29 May 1998 08:44:18 +0930 (CST) Received: from fang.dsto.defence.gov.au ([131.185.2.5]) by exchsa1.dsto.defence.gov.au with SMTP (Microsoft Exchange Internet Mail Service Version 5.5.1960.3) id LW7YQ0FK; Fri, 29 May 1998 08:46:42 +0930 Received: from eddie.dsto.defence.gov.au (eddie.dsto.defence.gov.au [131.185.2.111]) by fang.dsto.defence.gov.au (8.8.5/8.8.5) with ESMTP id IAA31244; Fri, 29 May 1998 08:46:43 +0930 (CST) Received: from dsto.defence.gov.au (localhost [127.0.0.1]) by eddie.dsto.defence.gov.au (8.8.8/8.8.5) with ESMTP id IAA01182; Fri, 29 May 1998 08:46:43 +0930 (CST) Message-ID: <356DF05A.E4B3AE09@dsto.defence.gov.au> Date: Fri, 29 May 1998 08:46:42 +0930 From: Matthew Thyer Organization: Defence Science Technology Organisation X-Mailer: Mozilla 4.05 [en] (X11; U; FreeBSD 3.0-CURRENT i386) MIME-Version: 1.0 To: Greg Lehey CC: Karl Pielorz , current@FreeBSD.ORG Subject: Re: aha1542 - again... References: <19980528123712.H4179@freebie.lemis.com> Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG I am about to add a 1542B to my current system and want to know about the bounce buffer issue. How do I tell whether the device I'm adding does DMA ? Do the probe messages tell me ? It's an ISA card and its an Adaptec 1542B so I assume being a SCSI card it will do DMA so I suppose I should include BOUNCE_BUFFERS since I have 32MB RAM on this P100. Greg Lehey wrote: > > On Thu, 28 May 1998 at 0:07:15 +0100, Karl Pielorz wrote: > > > > Hi, > > > > I read a while ago there were problems with the existing AHA1542 support > > on -current... I also read that someone (I can't remember now who it was) > > said they'd been through the code and fixed up a few things... > > > > As I remember it was a problem to do with bounce buffers... > > > > I've just had to add a 1542CF to my machine (as I'm out PCI slots and it > > was 'hanging around'), and I've run into problems with it - but I'm not > > sure there to do with bounce buffers etc. > > > > I know CAM is looking almost 'immanent' - but can anyone confirm whether > > the 1542 driver is in any useable state in -current at the moment? > > I'm developing vinum on a -CURRENT machine with a 1542B. I had > trouble with a 1542A, which appears to be a known problem (a number 0f > 0xff bytes strewn at regular intervals, usually 32K), but the 1542B is > working fine. > > > I have 2 x Double-Speed CD-ROM drives hooked up to it, I wouldn't have > > thought they were particularly 'stressy' for the driver ;-) > > Do you have problems? You'll need bounce buffers for any ISA DMA > device if you have more than 16 MB memory. > > Greg > -- > See complete headers for address and phone numbers > finger grog@lemis.com for PGP public key > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-current" in the body of the message -- Matthew Thyer Phone: +61 8 8259 7249 Corporate Information Systems Fax: +61 8 8259 5537 Defence Science and Technology Organisation, Salisbury PO Box 1500 Salisbury South Australia 5108 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message