Re: [PATCH] Add quirk to set AHCI mode on ICH boards

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Thu, 8 Nov 2007 23:57:48 -0500
Jeff Garzik <[email protected]> wrote:

> On Thu, Nov 08, 2007 at 11:44:22PM -0500, Mark Lord wrote:
> > Jeff Garzik wrote:
> > >On Thu, Nov 08, 2007 at 10:29:37PM -0500, Mark Lord wrote:
> > >>And I might even privately patch my own kernels to map the ACHI
> > >>BAR in the cases where the BIOS didn't...
> > >
> > >The inability to do this in the general case is the main reason why
> > >AHCI was not unconditionally enabled, even in IDE mode, when it was
> > >originally added...  :/
> > ..
> > 
> > Yeah, that one's always puzzled me.
> > It's just software,  so why don't we do it?  In the PCI layer, that
> > is?
> 
> Ah, but it's not just software:  when trying to find bus address
> space for the BAR, we don't know if we are stomping on magic hardware
> resources the BIOS has conveniently failed to tell us about.
> 
> So while in all likelihood you will have no problem finding a
> suitable bus address to use, as a generalized rule it is a far more
> difficult proposition.
> 

another thing to test before doing this everywhere is suspend/resume.
This would use the hardware in a way the bios doesn't expect, and sadly
that kind of thing tends to royally b0rk the suspend/resume code often
(but of course not always).


-- 
If you want to reach me at my work email, use [email protected]
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux