Serial ATA drive in UDMA33 mode, nForce 4 chipset

From: Hans Nieser (h.nieser_at_xs4all.nl)
Date: 11/01/05

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    Date: Tue, 01 Nov 2005 01:07:07 +0100
To: freebsd-questions@freebsd.org

    Hi list,

    I have an ASUS A8N-SLI Deluxe motherboard (which has an nForce4 chipset)
    and use a 200GB Western Digital Serial ATA hard disk in a box with FreeBSD
    5.4-RELEASE-p8 on it. For some reason, this disk is using the UDMA33 mode.
    I have come to understand that it should be able to use a much faster
    mode. I placed the output of pciconf -lv online here:
    http://pastebin.com/412798 . The relevant lines from dmesg:

       ------------------------------------------------------------------------
       atapci0: <nVidia nForce4 UDMA133 controller> port
    0xf000-0xf00f,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7 at device 6.0 on pci0
       ata0: channel #0 on atapci0
       ata1: channel #1 on atapci0
       atapci1: <GENERIC ATA controller> port
    0xd800-0xd80f,0xb70-0xb73,0x970-0x977,0xbf0-0xbf3,0x9f0-0x9f7 irq 20 at
    device 7.0 on pci0
       ata2: channel #0 on atapci1
       ata3: channel #1 on atapci1
       atapci2: <GENERIC ATA controller> port
    0xc400-0xc40f,0xb60-0xb63,0x960-0x967,0xbe0-0xbe3,0x9e0-0x9e7 irq 22 at
    device 8.0 on pci0
       ata4: channel #0 on atapci2
       ata5: channel #1 on atapci2
       ad8: 190782MB <WDC WD2000JD-00HBB0/08.02D08> [387621/16/63] at
    ata4-master UDMA33
       ------------------------------------------------------------------------

    I have tried - without success - to change the mode to UDMA133 (and slower
    modes, down to UDMA33) manually as follows:

       ------------------------------------------------------------------------
       root@aphax:~# atacontrol list
       ATA channel 0:
           Master: acd0 <FREECOM DVD+W-BR 4/1.34> ATA/ATAPI revision 0
           Slave: no device present
       ATA channel 1:
           Master: no device present
           Slave: no device present
       ATA channel 2:
           Master: no device present
           Slave: no device present
       ATA channel 3:
           Master: no device present
           Slave: no device present
       ATA channel 4:
           Master: ad8 <WDC WD2000JD-00HBB0/08.02D08> Serial ATA v1.0
           Slave: no device present
       ATA channel 5:
           Master: no device present
           Slave: no device present

       root@aphax:~# atacontrol mode 4
       Master = UDMA33
       Slave = BIOSPIO

       root@aphax:~# atacontrol mode 4 udma6 biospio
       Master = UDMA33
       Slave = BIOSPIO
       ------------------------------------------------------------------------

    After some googling I found a previous mailinglist post, one was about so
    called 'MKIII' patches, which I was going to give a try, when I read
    another post from earlier this year from someone with the same chipset
    with the exact same issue:
    <http://lists.freebsd.org/pipermail/freebsd-current/2005-May/050522.html>
    And he's had no success with the patches.

    So now I'm wondering what I should do... Should I try those patches
    anyway? (If so, does anyone know of a guide for someone who has never
    applied any patches before?) Is there perhaps by now another solution for
    this, or should I just switch to 6.0RC1 (or final, which I understand
    should be released very soon)?

    Hans Nieser
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