kern/71889: SATA disks hang the system with Promise-PDC-20378 ATA chip

[Yuri Victorovich]

>Number:         71889
>Category:       kern
>Synopsis:       SATA disks hang the system with Promise-PDC-20378 ATA chip
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Sep 18 19:30:17 GMT 2004
>Closed-Date:
>Last-Modified:
>Originator:     Yuri Victorovich
>Release:        5.3-BETA4
>Organization:
N/A
>Environment:
didn't capture: identical to BETA4 as built on Sep 11.
>Description:
Was able to install 5.3-BETA4 on SATA-150 disks from Maxtor (2 disks 120GB each).
But after the boot system seems to hang randomely with the message:
UDMA request timeout.
After this system becomes unusable, files seem to be broken, unable
to execute ls for example.

Doesn't seem to depend weather RAID option is used and which RAID is
used (RAID-0 or RAID-1). Also seems to be same way with one disk only.
>How-To-Repeat:
see above
>Fix:
N/A
>Release-Note:
>Audit-Trail:
>Unformatted: