On Sat, 2007-02-10 at 09:03 -0500, Tejun Heo wrote:
> Matteo Croce wrote:
> > On Friday 09 February 2007 15:54:53 you wrote:
> >> On Fri, 2007-02-09 at 15:27 +0100, Matteo Croce wrote:
> >>> + { PCI_VDEVICE(INTEL, 0x27c4), board_ahci }, /* ICH7M */
> >> Wasn't this PCI ID proposed for addition a while ago, and subsequently
> >> rejected? Or am I missing something?
> >
> > rejected? why?
>
> Ah... right.
>
> All ICH7 R/M silicons can be put into either IDE or AHCI mode. Which
> mode is used is currently determined by BIOS. If BIOS puts the
> controller into ahci mode on boot, ahci is attached; otherwise,
> ata_piix. This sometimes reduces confusion level but more importantly
So this means on macbook* one can use either mode ?!
> in some cases it's not possible to use the other mode because PCI
> resource allocation is upto BIOS and it's not guaranteed to allocate all
> the needed resources for the mode not in use.
>
> Till now, the policy to follow BIOS setting has worked well enough.
> Most desktop BIOSen give choice between the two modes anyway. There
> have been some cases where some desktops and many notebooks where the
> silicon itself is capable of ahci but BIOS doesn't allow it. It seems
> Mac is one of them.
I don't get it. Why is it rejected then ? If I'd like to use the ahci
mode of the ich7 r/m driver I just compile it into the kernel, else the
piix ?!
Soeren
--
For the one fact about the future of which we can be certain is that it
will be utterly fantastic. -- Arthur C. Clarke, 1962
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