Date: Tue, 7 Apr 1998 21:43:59 +0200 (MEST) From: Søren Schmidt <sos@FreeBSD.ORG> To: bob@wbs.net (Bob Lash) Cc: toor@dyson.iquest.net, technical@wbs.net, sos@FreeBSD.ORG, freebsd-hardware@FreeBSD.ORG, julian@ivision.co.uk Subject: Re: 12.0 GB Quantum Bigfoot TX IDE seen as 8.4 GB Message-ID: <199804071943.VAA10482@sos.freebsd.dk> In-Reply-To: <Pine.LNX.3.91.980407120121.6938A-100000@webchat2.wbs.net> from Bob Lash at "Apr 7, 98 12:03:43 pm"
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In reply to Bob Lash who wrote:
> Correction -- the dmesg file for this machine shows:
>
> wdc0: unit 1 (wd1): <QUANTUM Bigfoot TX12.0AT>
> wd1: 8063MB (16514064 sectors), 16383 cyls, 16 heads, 63 S/T, 512 B/S
> wdc1 at 0x170-0x177 irq 15 on isa
> wdc1: unit 0 (wd2): <QUANTUM Bigfoot TX12.0AT>
> wd2: 8063MB (16514064 sectors), 16383 cyls, 16 heads, 63 S/T, 512 B/S
> wdc1: unit 1 (wd3): <QUANTUM Bigfoot TX12.0AT>
> wd3: 8063MB (16514064 sectors), 16383 cyls, 16 heads, 63 S/T, 512 B/S
>
> > > If Bob wants to fix it himself, we would also be willing to commit the
> > > changes.
> >
> > Thanks for the thought, John -- I wish I knew enough about the inner
> > workings of freeBSD to directly help with the code... :)
Hmm, just checked the ATA4 std, and this is exactly yhe geometry that
should be returned for devices with more than 16515072 sectors, ie
8.4G. So what we are seeing is a "feature" of the ATA4 std :(
It seems that such a device should be LBA adressed instead of CHS,
which we use, so we need to modify the driver to do that.
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Søren Schmidt (sos@FreeBSD.org) FreeBSD Core Team
Even more code to hack -- will it ever end
..
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