linux-kernel - Re: [PATCH] x86, eboot: Support initrd loaded above 4G

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Message-ID: <53C547A5.3030500@fensystems.co.uk>
Date:	Tue, 15 Jul 2014 16:24:21 +0100
From:	Michael Brown <mbrown@...systems.co.uk>
To:	Matt Fleming <matt@...sole-pimps.org>,
	Yinghai Lu <yinghai@...nel.org>
CC:	Matt Fleming <matt.fleming@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	linux-efi@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Leif Lindholm <leif.lindholm@...aro.org>
Subject: Re: [PATCH] x86, eboot: Support initrd loaded above 4G

On 15/07/14 16:10, Matt Fleming wrote:
> Going forward, I suspect any attempts to use the EFI File Protocol are
> going to result in this kind of breakage, and that the only thing that
> can be relied upon is the Disk I/O Protocol.
>
> But doing Disk I/O would necessitate adding the in-kernel FAT driver to
> the EFI boot stub, which is a scary idea (though not without merit).

Booting via iPXE will give you an EFI_SIMPLE_FILE_SYSTEM_PROTOCOL 
(providing access to the initrd previously downloaded by iPXE).  It will 
also give you a dummy disk I/O protocol which always return EFI_NO_MEDIA.

In those circumstances, only the EFI_SIMPLE_FILE_SYSTEM_PROTOCOL will work.

Michael
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