Enable AHCI mode via grub bootloader (for extra Mac Pro SATA ports)

Discussion in 'Mac Pro' started by rhildinger, May 20, 2008.

  1. rhildinger macrumors member

    Oct 11, 2006
    Does anyone have a cached version of the following thread at the onmac forums:


    This thread apparently has instructions on setting up grub to chainload windows in such a way that AHCI mode is re-enabled after the BIOS CSM gets invoked. Unfortunately the onmac foums appear to be down, and I don't when or even if they'll be back up, so I was wondering if anyone had detailed instructions for this, or perhas a cached version of that onmac forum thread.

  2. Cryptic1911 macrumors member

    Mar 11, 2008
    from: http://forums.macrumors.com/archive/index.php/t-307469.html

    after finding this thread in the onmac forums i finally was able to get my pioneer sata drive to work under bootcamp:


    basically you have to do the following:

    install xp and ubuntu linux with a pata dvd drive
    in xp change the ide 2680 driver to the intel ahci driver found here:
    http://downloadcenter.intel.com/Det...All&OSFullName=All Operating Systems&lang=eng

    boot into ubuntu and change the stage1 file of the grub bootloader to this:

    this keeps the mac pro in ahci mode when booting a foreign os

    now you can boot windows using the linux partition, this will start grub and keep the mac pro in the correct mode

    i also installed refit to make things a little easier but as far as i know using alt when booting shoud work too

    if anyone tries this and has any questions feel free to ask
  3. rhildinger thread starter macrumors member

    Oct 11, 2006
    Cryptic1911, Thanks for your reply! I saw that post as well, but it's a little on the sparse side concerning details, especially with regards to setting up grub in the first place. Hopefully someone on the board has some more details they can add to this...


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