linux-kernel - Re: [PATCH V3 3/4] PCI: Add support for non-BAR ROMs

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Date:	Wed, 5 Sep 2012 14:44:55 +0100
From:	Matthew Garrett <mjg@...hat.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Don Dutile <ddutile@...hat.com>, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-efi@...r.kernel.org,
	mfleming@...el.com, dwmw2@...radead.org, bhelgaas@...gle.com
Subject: Re: [PATCH V3 3/4] PCI: Add support for non-BAR ROMs

On Wed, Sep 05, 2012 at 02:30:10PM +0100, Alan Cox wrote:
> On Wed, 5 Sep 2012 14:20:07 +0100
> Matthew Garrett <mjg@...hat.com> wrote:
> > We've no good way of knowing what the firmware's giving us - we copy it 
> > to RAM in the EFI init process, so by the time we're here it certainly 
> > shouldn't be on the PCI bus.
> 
> In which case how do you know that physical address you have been given
> actually has a mapping in kernel virtual space. It seems like it ought to
> be getting an ioremap in that case ?
> 
> phys_to_virt is not valid for arbitary addresses.

The pages are allocated as EFI_LOADER_DATA, and that gets mapped as 
E820_RAM.

-- 
Matthew Garrett | mjg59@...f.ucam.org
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