Re: kern/37866: Thinkpad T61 disk doesn't work in AHCI mode

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

On Fri, Jan 25, 2008 at 12:40:00AM +0000, smb%cs.columbia.edu@localhost wrote:
> >Number:         37866
> >Category:       kern
> >Synopsis:       Thinkpad T61 disk doesn't work in AHCI mode
> >Confidential:   no
> >Severity:       serious
> >Priority:       medium
> >Responsible:    kern-bug-people
> >State:          open
> >Class:          sw-bug
> >Submitter-Id:   net
> >Arrival-Date:   Fri Jan 25 00:40:00 +0000 2008
> >Originator:     Steven M. Bellovin
> >Release:        NetBSD 4.99.49
> >Organization:
> Department of Computer Science, Columbia University
> >Environment:
>       
>       
> System: NetBSD yellowstone.machshav.com 4.99.49 NetBSD 4.99.49 (YELLOWSTONE) 
> #0: Mon Jan 21 23:10:45 EST 2008 
> smb%yellowstone.machshav.com@localhost:/usr/BUILD/obj/sys/arch/amd64/compile/YELLOWSTONE
>  amd64
> Architecture: x86_64
> Machine: amd64
> >Description:
>       Much of the time, if I boot my machine with the disk set in the
>       BIOS to AHCI mode, it doesn't see the whole disk.  This causes
>       errors in finding the NetBSD partition and the root partition,
>       and if you persist you'll overwrite random parts of the disk,
>       including things outside of what NetBSD should be touching.
> 
>       It is not 100% reproducbile.  In tests today, it didn't happen
>       if I rebooted from power-off; it did happen if I warm-booted.
>       This suggests a bug in the initialization code.

This is a known issue, and it's most probably timing-related in
the PHY setup code (probably between the "link up" and the IDENTIFY
command). unfortunably I can't reproduce this issue on my systems.

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--