Re: [coreboot] Test SeaBIOS AHCI support

[Neo The User]

Hi, I have a GA-MA785GM-US2H (GIGABYTE 785GM board) with AHCI SATA, and if I have AHCI off in SeaBIOS, I get caught in an infinite restarting loop. If I have it on, I can actually reach GRUB and select my kernel but Windows 7 and Linux both don't start and with linux, a kernel panic happens with the last message on the screen "[    0.180179] pci 0000:00:11.0: set SATA to AHCI mode"

I spent about a month on and off porting coreboot to my board, but the only reason it took me that long was because I only have one PC and I do not have an environment set up for serial debugging, so it was all guess work. I noticed that the MA785GMT and MA78GM were in the tree so I based most of the work off of those two boards, plus some lines from the Tilapia board.

I have attached the somewhat working port as a patch (ma785gm-us2h.patch) and I didn't touch the GPL headers at all, keeping the original ones from Tilapia, if that was ok. If not, I'll be glad to change it accordingly.

I hope the patch format is correct!

Signed-off-by: Alec Ari

--- On Fri, 12/31/10, Scott Duplichan  wrote:
> From: Scott Duplichan 
> Subject: Re: [coreboot] Test SeaBIOS AHCI support
> To: "'Kevin O'Connor'" 
> Cc: [e-mail]
> Date: Friday, December 31, 2010, 4:43 PM
>
> On Fri, Dec 31, 2010 at 10:21:32AM -0600, Scott Duplichan
> wrote:
> > Hello Kevin,
> >
> > Thanks a lot. Is this native 16-bit AHCI support that
>
> doesn't rely on an option rom?
> >
>
> ]It's native AHCI DMA support.  (No option rom
> needed.)
>
> ]-Kevin
>
> That is great to hear. Some HP notebooks have this
> capability, but
> I know of no others. This setup should allow cutting
> seconds from
> Windows boot time because Windows spends lots of time on
> IDE drives
> that are not installed. If all IDE devices are disabled and
> only
> AHCI visible, Windows can boot a lot faster.
>
> I made an initial test using coreboot+seabios on an AMD
> RS780/SB700
> system. So far it is not detecting the drives. But this
> test required
> hacking in code to disable the SB700 IDE device and switch
> the SATA
> device from IDE mode to AHCI mode. I have not yet checked
> to see if
> that code is even working correctly. I will continue
> debugging this
> in a day or two.
>
> Thanks,
> Scott