From owner-freebsd-hackers Thu Jul 18 21:00:56 1996 Return-Path: owner-hackers Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id VAA23160 for hackers-outgoing; Thu, 18 Jul 1996 21:00:56 -0700 (PDT) Received: from godzilla.zeta.org.au (godzilla.zeta.org.au [203.2.228.19]) by freefall.freebsd.org (8.7.5/8.7.3) with SMTP id VAA23103; Thu, 18 Jul 1996 21:00:41 -0700 (PDT) Received: (from bde@localhost) by godzilla.zeta.org.au (8.6.12/8.6.9) id NAA00724; Fri, 19 Jul 1996 13:53:25 +1000 Date: Fri, 19 Jul 1996 13:53:25 +1000 From: Bruce Evans Message-Id: <199607190353.NAA00724@godzilla.zeta.org.au> To: bab@cypress.com, jkh@time.cdrom.com Subject: Re: IDE cd-rom drivers Cc: committers@freebsd.org, hackers@freebsd.org Sender: owner-hackers@freebsd.org X-Loop: FreeBSD.org Precedence: bulk >-current would be the best way to find that out. I don't know how >to get the relevant -current source - can I FTP down the days >latest from the web site? I'll look. Most people use sup or ctm. > I also don't know how I would go about testing my changes >to the -current driver. Can someone tell me if it'd be possible >for me to download the -current source, compile a kernel from it, >and boot with that kernel on my 2.1.0 system? Not everything >would have to work, just enough for me to ensure that the ATA bus, It might barely work. Networking and things like ps won't work. > Is there a good reference on the internet for how to program >the AT dma controllers? I need that information and I also >am trying to figure out how to tell the ATA controller what >DMA channel to use. There is only a single DMA request line >on the ATA bus, so something somewhere must be programmable >to translate this DMA line into the correct DMA channel, but >for the life of me I can't find it. Normal ISA DMA can't be used or isn't worth using. Some PCI IDE controllers support it. -current has a prototype (unused) interface for the Triton chipset (wd82371 chip). Bruce