Date: Wed, 22 Dec 1999 05:51:14 +0800 From: Peter Wemm <peter@netplex.com.au> To: Theo van Klaveren <havoc@phoenix.student.utwente.nl> Cc: freebsd-current@freebsd.org Subject: Re: Problems with the ATA-driver Message-ID: <19991221215114.977C71CCE@overcee.netplex.com.au> In-Reply-To: Message from Theo van Klaveren <havoc@phoenix.student.utwente.nl> of "Tue, 21 Dec 1999 15:42:44 %2B0100." <Pine.BSF.4.21.9912211530530.32016-100000@Cal30B054.student.utwente.nl>
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Theo van Klaveren wrote:
>
> When installing the 08-dec-1999 snapshot (before ATA went in GENERIC),
> a recompile from the kernel with the ATA driver instead of the WD
> driver resulted in an unbootable system because of the following
> error (approx.):
>
> mounting root /dev/ad0s1a
> ata-master: lost disk contact
> ata: resetting devices ..
>
> After this, the machine hangs and doesn't respond to anything but a push
> on the Big Red Button. A few days later, this was fixed by Soren (sp?) but
> it broke again as I recompiled my system yesterday (This was the first
> time after it had been fixed, so I don't know when exactly it broke).
>
> Harddisks: Western Digital Caviar (2.0 GB), non-DMA and
> Western Digital Caviar (2.5 GB), DMA-33.
> Mainboard: Asus P5A-B Super7
> Chipset: ALi Aladdin V AGPset
>
> Taking the UDMA disk out doesn't help. Everything works just
> fine with the WD driver...
Same here, but with a toshiba laptop disk. I have to comment out a version
test in ata-disk.c to get it to work.
--- ata-disk.c 1999/12/18 20:06:30 1.46
+++ ata-disk.c 1999/12/21 21:48:28
@@ -117,7 +117,7 @@
static __inline int
udmamode(struct ata_params *ap)
{
- if ((ap->atavalid & 4) && ad_version(ap->versmajor) >= 3) {
+ if ((ap->atavalid & 4) /* && ad_version(ap->versmajor) >= 3 */) {
if (ap->udmamodes & 0x10) return (ap->cblid ? 4 : 2);
if (ap->udmamodes & 0x08) return (ap->cblid ? 3 : 2);
if (ap->udmamodes & 0x04) return 2;
Without this, ata thinks is's an ATA-0 disk and tries to use DMA mode.
However, it hangs with:
mounting root /dev/ad0s1a
ata-master: lost disk contact
ata: resetting devices ..
and never gets to "done" just like you. If I remove the ATA version test and
just have it look at the "I support UDMA" bit, it runs in UDMA33 mode and
works fine. I suspect that if it got a CRC error and tried to do a fallback
that it would hang there too, but I have not seen any.
I think the (plain) DMA code is broken somewhere.
Cheers,
-Peter
--
Peter Wemm - peter@FreeBSD.org; peter@yahoo-inc.com; peter@netplex.com.au
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