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

[rhildinger]

Does anyone have a cached version of the following thread at the onmac forums:

http://forum.onmac.net/showthread.php?t=2739

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.

Thanks!
-Robert

 

[Cryptic1911]

from: https://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:

http://forum.onmac.net/showthread.php?t=2739

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:
http://www.olofsson.info/grub/stage1

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

 

[rhildinger]

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...

-Robert