kern/104822: RELENG_6 hangs with VIA VT8237A chipset

[m0f0x]

>Number:         104822
>Category:       kern
>Synopsis:       RELENG_6 hangs with VIA VT8237A chipset
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Oct 26 07:40:20 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     m0f0x
>Release:        FreeBSD 6.1-RELEASE-p10 amd64
>Organization:
-
>Environment:
System: FreeBSD fixed-mofo.localdomain 6.1-RELEASE-p10 FreeBSD 6.1-RELEASE-p10 #1: Tue Oct 17 16:07:41 BRST 2006 root at fixed-mofo.localdomain:/usr/obj/usr/src/sys/FIXED amd64


>Description:
	My system uses the VIA VT8237A chipset. Currently one SATA drive is attached.

	My RELENG_6_1 installation works fine. The hard drive is healthly and tested.

	After updating to RELENG_6 (10/26/2006), the system hangs on the boot process, with the following errors:
		ad4: error issuing READ_DMA command
		ad4: timeout waiting to issue command
		ad4: error issuing WRITE_DMA command
		ad4: timeout waiting to issue command

	My hard drive:
		ad4: 76319MB <SAMSUNG HD080HJ/P ZH100-41>
>How-To-Repeat:
	Update to RELENG_6 on a machine that uses the VIA VT8237A chipset; compile and install the new kernel.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted: