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

The following reply was made to PR kern/37866; it has been noted by GNATS.

From: Manuel Bouyer <>
Subject: Re: kern/37866: Thinkpad T61 disk doesn't work in AHCI mode
Date: Fri, 25 Jan 2008 22:02:57 +0100

 On Fri, Jan 25, 2008 at 12:40:00AM +0000, 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 4.99.49 NetBSD 4.99.49 (YELLOWSTONE) 
 > #0: Mon Jan 21 23:10:45 EST 2008 
 >  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 <>
      NetBSD: 26 ans d'experience feront toujours la difference

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