port-alpha/39383: DEC alpha 1000a: VT6421A-based SATA controller breaks netbsd boot

[pk.ffm%gmx.net@localhost]

>Number:         39383
>Category:       port-alpha
>Synopsis:       DEC alpha 1000a: VT6421A-based SATA controller breaks netbsd 
>boot
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    port-alpha-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Aug 19 22:10:00 +0000 2008
>Originator:     Peter Kunst
>Release:        4.0
>Organization:
>Environment:
NetBSD alphabsd 4.0 NetBSD 4.0 (GENERIC) #0: Sat Dec 15 22:13:05 PST 2007 
builds@wb27:/home/builds/ab/netbsd-4.0-RELEASE/alpha/200712160005Z-obj/hom
e/builds/ab/netbsd-4-0-RELEASE/src/sys/arch/alpha/compile/GENERIC alpha
>Description:
Hardware: DEC Alpha 1000a

OS: NetBSD 4.0

Problem: Installing VIA VT6421A SATA controller (Producer: Wintech) breaks 
booting into NetBSD 4.0. Getting "db>" kernel debugger prompt.

Stacktrace or output of kernel debugger on request.

Hope i can help to run NetBSD even on alpha hardware :-)

 Cheers,
 Peter
>How-To-Repeat:
Install given above hardware into another DEC alpha 1000a (i've tried PCI slot 
1 and 4) and try to boot...
>Fix: