This was a common problem along about 4.5-4.6. Upgrade to at least 4.7, see if it helps; the cause of the common problem was fixed in 4.7- prerelease.
I've been running "FreeBSD 4.7-RELEASE" on my production system, so I tried moving the disks over and booting. Same problem.
One message I found on eht web indicated that I might be able to get past the problem by disabling UltraDMA. Unfortunately:
* There isn't any obvious way to do this in the AMIBIOS.
* Setting hw.ata.ata_dma to 0 in /etc/sysctl.conf won't help,
because (from sysctl.conf(5)): The /etc/sysctl.conf file is read in when the system goes
into multi-user mode ... and the problem asserts itself while the system is still in
single-user mode.So, I decided to change line 90 of /usr/src/sys/dev/ataata-disk.c to:
static int ata_dma = 0;
This allowed the system to boot without (apparent) error, but I'd still like to boot off a PCI-based ATA card, instead.
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