SiS 651 success wth FreeBSD 4.9 and PR-43345

[david at groovelicious.org]

I recently bought a Shuttle SS51G XPC to re-house my server. I was able to
boot FreeBSD 4.9-RELEASE by turning off UDMA support in the BIOS. I then
applied PR-43345 and re-enabled UDMA support and it worked.
Upon adding a second drive (slave) to the primary IDE interface, I saw
these messages (from dmesg):

ad0: 76345MB <MAXTOR 6L080J4> [155114/16/63] at ata0-master UDMA100
ad1: 152627MB <WDC WD1600JB-00FUA0> [310101/16/63] at ata0-slave UDMA100
Mounting root from ufs:/dev/ad0s1a
ad0s1h: UDMA ICRC error writing fsbn 105786783 of 5696-5703 (ad0s1 bn
105786783; cn 6584 tn 235 sn 18) retrying
ad0s1h: UDMA ICRC error writing fsbn 105786783 of 5696-5703 (ad0s1 bn
105786783; cn 6584 tn 235 sn 18) retrying
ad0s1h: UDMA ICRC error writing fsbn 105786783 of 5696-5703 (ad0s1 bn
105786783; cn 6584 tn 235 sn 18) retrying
ad0s1h: UDMA ICRC error writing fsbn 105786783 of 5696-5703 (ad0s1 bn
105786783; cn 6584 tn 235 sn 18) falling back to PIO mode

The system seems to work fine, although I'm contemplating putting the
second drive on the secondary IDE interface to see if this makes a
difference. I didn't notice this behaviour with a single IDE drive.

Can anyone point me to information on the ATA driver model for FreeBSD?
Since PR-43345 is a workaround rather than a true fix in my opinion, it
would be nice to sort it out properly.

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