6.0-CURRENT and ATAPI_IDENTIFY timed out and VIA MVP3

Greetings from Sweden,

I've been trying to find more information about the fact that one ata
channel has stopped working after I upgraded from 5.2.1-p9 to 6.0 #0.

The error comes when booting and looks like this:

Dec  1 19:53:25 scomber kernel: ata1-slave: FAILURE - ATAPI_IDENTIFY timed out
Dec  1 19:53:30 scomber kernel: ata1-slave: FAILURE - ATAPI_IDENTIFY timed out
Dec  1 19:53:35 scomber kernel: ata1-master: FAILURE - ATA_IDENTIFY timed out
Dec  1 19:53:40 scomber kernel: ata1-master: FAILURE - ATA_IDENTIFY timed out

Needless to say both devices attached to ata1 (cdrom and HD) were found and
working fine in 5.2.1-p9.

I've tried replacing the cdrom and HD with others and combinations of them
but all give same result.

Bios finds cdrom and HD fine.

When I run atacontrol list I get the following:

scomber# atacontrol list
ATA channel 0:
    Master:  ad0 <FUJITSU MPB3064ATU E/4010> ATA/ATAPI revision 3
    Slave:   ad1 <ST36422A/3.05> ATA/ATAPI revision 4
ATA channel 1:
    Master:      no device present
    Slave:       no device present

And atacontrol reinit 1 gives:

scomber# atacontrol reinit 1
Master:      no device present
Slave:       no device present

My motherboard is an old Shuttle HOT-591p and has VIA MVP3 chipset for 2
ultra33 dma ide.

I would be very grateful for any kinds of leads on solving this problem. It
feels terrible to have a 'crippled' FreeBSD.

Please answer to my email raggen_at_passagen.se.