linux-kernel - Re: [PATCH[RFC] Quirk macbook pro 6,2 into ahci mode

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Sun, 18 Jul 2010 18:44:41 -0400
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Matthew Garrett <mjg59@...f.ucam.org>
CC:	Jens Axboe <jaxboe@...ionio.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [PATCH[RFC] Quirk macbook pro 6,2 into ahci mode

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


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/