Messages in this thread | | | Date | Sun, 18 Jul 2010 18:44:41 -0400 | From | Jeff Garzik <> | Subject | Re: [PATCH[RFC] Quirk macbook pro 6,2 into ahci mode |
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On 07/18/2010 02:42 PM, Matthew Garrett wrote: > On Sun, Jul 18, 2010 at 10:03:44AM -0600, Jens Axboe wrote: >> Looking at the specs, I don't see what I am missing to make this >> work for resume. I'm assuming that EFI did initialize some bits >> that am missing when coming out of resume, but I don't know which >> bits. > > There's no guarantee that the AHCI BAR is programmed by the firmware (it > seems to be on the Macs, but won't be on most hardware). Is it getting > reprogrammed on resume?
That's definitely the key question.
I would have quirked AHCI/piix hardware into AHCI mode long ago, if firmwares defaulting to piix mode would actually program the PCI BAR correctly.
Or, if the firmware had some way to safely allocate a bus memory range, which we could ourselves program into the PCI BAR. Some non-PC platforms can do that.
Jeff
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