Date: Sun, 31 Mar 1996 12:32:39 -0700 (MST) From: Terry Lambert <terry@lambert.org> To: macgyver@infinet.com (Wilson MacGyver) Cc: terry@lambert.org, macgyver@infinet.com, hackers@FreeBSD.org, questions@FreeBSD.org Subject: Re: Dell EIDE drive data corruption with FreeBSD? Message-ID: <199603311932.MAA11535@phaeton.artisoft.com> In-Reply-To: <315DC137.84D@cylatech.com> from "Wilson MacGyver" at Mar 30, 96 06:18:15 pm
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> > Is this the flawed IDE chipset that loses data if you interleave I/O? > > > > If so, the answer is to change your CMOS settings. > > Yes it is, but I thought the FreeBSD IDE driver is not affected by this bug? It does not initiate DMA's. DMA completion is not the only thing that could cause an interrupt. A bad spot on the disk, two disks on the same controller, or an IDE CDROM can also trigger the problem. Since FreeBSD doesn't use bus mastering DMA, it doesn't trigger the bug if all you have is one disk, or two disks from the same manufacturer which are configured correctly (I have heard som reports on Conner, but nothing verified). Either way, it can't *hurt* FreeBSD for you to set the CMOS settings to get around the bug. 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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