Date: Thu, 16 Nov 1995 12:04:48 -0700 (MST) From: Terry Lambert <terry@lambert.org> To: koshy@blr.novell.com Cc: hackers@FreeBSD.ORG Subject: Re: IDE drives using DMA? Message-ID: <199511161904.MAA03474@phaeton.artisoft.com> In-Reply-To: <30aacced0.2096@novidc.blr.novell.com> from "koshy@blr.novell.com" at Nov 16, 95 11:02:00 am
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> I chanced upon a book about ATA drives and noted there that IDE can > optionally support DMA transfers in addition to the regular programmed > IO. > > Does anyone have any experience with this? Are such configurations > common? Any catches or caveats that hinder DMA use with IDE drives? The most common IDE chip, the RZ1000, will silently corrupt data if you get *any* interrupt during a DMA transfer. This was discussed in great, gory detail on comp.sys.intel (Intel makes the RZ1000). This affects something like 1/3 to 1/2 of all IDE interfaces currently out there. Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers.
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