kern/92016: SATA Disk not detected on Dell PowerEdge 850

[D.Pageau]

The following reply was made to PR kern/92016; it has been noted by GNATS.

From: "D.Pageau" <dpageau at infodev.ca>
To: bug-followup at FreeBSD.org
Cc:  
Subject: Re: kern/92016: SATA Disk not detected on Dell PowerEdge 850
Date: Thu, 19 Jan 2006 14:37:30 -0500

 Problem describe:
 
 Doug Ambrisko writes:
 
 | This is sort-of the clue indirectly.  The issue is that the ICH7 and
 | maybe ICH6 have a hybrid AHCI mode in which the SATA status, error, 
 control
 | registers are present in AHCI for compatibility but that's all.  The
 | reset of the AHCI registers are not there so then you have to
 | wack the registers in PCI space 0x92 to reset the controller.  Doing
 | an AHCI reset won't work since it isn't running full AHCI mode.
 |
 | I don't have a fix but this is the problem that I see.  If we don't
 | do the channel reset via PCI space then it can never get out of that
 | state so no drives are found.