kern/56617: Hang on boot w/neomagic audio on Dell Latitude LS

[Matthew E. Gove]

>Number:         56617
>Category:       kern
>Synopsis:       Hang on boot w/neomagic audio on Dell Latitude LS
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Sep 08 17:20:00 PDT 2003
>Closed-Date:
>Last-Modified:
>Originator:     Matthew E. Gove
>Release:        FreeBSD 4.8-RELEASE-p4 i386
>Organization:
>Environment:
System: FreeBSD pouch.geeknet 4.8-RELEASE-p4 FreeBSD 4.8-RELEASE-p4 #2: Tue
Aug 26 17:22:30 EDT 2003 root at pouch.geeknet:/usr/src/sys/compile/POUCH i386

Dell Latitude LS. 

pcm0 at pci1:0:1:  class=0x040100 card=0x00801028 chip=0x800510c8 rev=0x20 hdr=0x00
    vendor   = 'Neomagic Corporation'
    device   = 'NM2200 MagicMedia 256AV Audio Device'
    class    = multimedia
    subclass = audio

The problem also exists on 5.x.

>Description:
System locks up hard after probing pcm if enabled.

>How-To-Repeat:
Boot with pcm enabled on a Dell Latitude LS w/ MagicMedia 256AV audio.

>Fix:

commenting out nm_wr(sc, 0x6cc, 0x87, 1); in nm_initcd() stops the hang. 




>Release-Note:
>Audit-Trail:
>Unformatted: