Re: kern/37826: Kernel sees only one SATA channel (out of four) on Abit AN52 motherboard (nvidia nf520__single chip)

[David Holland <dholland-bugs%netbsd.org@localhost>]

The following reply was made to PR kern/37826; it has been noted by GNATS.

From: David Holland <dholland-bugs%netbsd.org@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: kern-bug-people%netbsd.org@localhost, gnats-admin%netbsd.org@localhost,
        netbsd-bugs%netbsd.org@localhost, develunix%gmail.com@localhost
Subject: Re: kern/37826: Kernel sees only one SATA channel (out of four) on
        Abit AN52 motherboard (nvidia nf520__single chip)
Date: Tue, 20 May 2008 03:35:58 +0000

 On Thu, May 15, 2008 at 12:04:50AM +0000, David Holland wrote:
  > On Sun, Apr 13, 2008 at 02:43:37AM +0000, David Holland wrote:
  >  > On Mon, Jan 21, 2008 at 03:10:00AM +0000, develunix%gmail.com@localhost 
wrote:
  >  >  > NetBSD only sees one SATA channel out of four. The BIOS sees the
  >  >  > two hard drives plugged into two of the four hardware interfaces.
  >  > 
  >  > Possibly, duplicate of 38011 - does the patch therein help?
  > 
  > For the record, it appears that it isn't and it doesn't, respectively;
  > I have a machine with the same viaide (nForce MCP65) and I've finally
  > had some time to tinker with it, without result.
 
 The solution to this problem (and also the interrupt routing/ACPI
 problems I've been having with the same viaide) is to run it in AHCI
 mode. Setting it in the BIOS and including ahcisata(4) in the kernel
 JFW.
 
 (Well, except that it has the problem where occasionally one of the
 disks probes as a few kilobytes long, but I think that's a known issue
 with ahcisata.)
 
 I have my doubts as to whether MCP65 (and later, too) will ever work
 properly except as AHCI; the Linux and FreeBSD drivers both probe it
 and immediately enable AHCI mode. I suspect, for people who don't have
 a BIOS setting, that we ought to teach ahcisata_pci.c to do that, and
 take the PCI ids out of viaide.c so we don't try to run it as viaide.
 
 -- 
 David A. Holland
 dholland%netbsd.org@localhost