Date: Wed, 5 Apr 2000 08:43:04 +0200 (CEST) From: Soren Schmidt <sos@freebsd.dk> To: svysh@pn.sinp.msu.ru (Sergei Vyshenski) Cc: mike@sentex.net (Mike Tancsa), freebsd-stable@freebsd.org Subject: Re: ata sad combinatorics Message-ID: <200004050643.IAA36470@freebsd.dk> In-Reply-To: <3.0.5.32.20000405094647.007c2660@vivaldi> from Sergei Vyshenski at "Apr 5, 2000 09:46:47 am"
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It seems Sergei Vyshenski wrote: > >The old Intel PIIX is know to have DMA problems, I never intended to > >support it, but the current code (from luiqi IIRC) was found to be > >sufficient IF the BIOS did its job right. I seems that we have a > >BIOS here that doesn't setup things the way they should be, and the > >DMA setup fails because of that. Is there any way you could upgrade > >your BIOS ?? > > > >-Søren > > > > After more experiments: > 1) A pair of any disks are ok as ad0 and ad1, both in dma mode. > 2) In a pair ad0+ad2, disk ad2 (irrespective of disk make) > is not mounted in dma that easy. BUT, if I wait long enough, > (about 1 min) it says: > "ata1: trying to fallback to PIO mode" > after which I have ad0 in dma, ad2 in pio, and no further problems. > > Very clever behavior in such a case! > Thanks a lot for your response. You're welcome :) > Do you know a way to say that I want just PIO for disk ad2? Use sysctl on the hw.atamodes oid (man ata.4) -Søren To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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