Date: Sat, 17 Oct 1998 13:23:16 -0600 From: Brett Glass <brett@lariat.org> To: sos@FreeBSD.ORG Cc: bugs@FreeBSD.ORG Subject: Re: Crash workaround: ATAPI and ATAPI_STATIC required in 2.2.7 wd driver Message-ID: <4.1.19981017130810.06f04590@mail.lariat.org> In-Reply-To: <199810171905.VAA11389@sos.freebsd.dk> References: <4.1.19981017121426.06ec3ea0@mail.lariat.org>
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At 09:05 PM 10/17/98 +0200, Søren Schmidt wrote: >Hmm, I doing a rewrite (slowly :( ) of the ata/atapi system, but the >problem you see I've never heard of before. What kind of drives do >you have We have several, but the machine that acted up first had a Western Digital Caviar 32500. Here are the messages displayed during a boot with the -v (verbose) boot option: wdc0 at 0x1f0-0x1f7 irq 14 on isa wdc0: unit 0 (wd0): <WDC AC32500H> wd0: 2441MB (4999680 sectors), 4960 cyls, 16 heads, 63 S/T, 512 B/S >and what flags do you have on the wd driver ?? The defaults. >The only thing that I can come up with is that the ATAPI options >alters the timing a bit... Are you sure? It seems to me that there might be an error in buffering (hence the page faults) or in IRQ handling. I don't know the code well enough to tell, though. (I'd love to become a FreeBSD kernel hacker, but can find no good reference on register use conventions, timing conventions, kernel data structures, etc. -- and I know that one can't always glean these subtleties from the code. The one time I hacked the wd driver and published some changes, I was told that I'd broken a bunch of rules, though the code somehow worked. But anyway, this is a side issue.) There's got to be some reason why the code is trying to access invalid addresses in one case but not the other.... --Brett To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-bugs" in the body of the message
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