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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 -- 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/
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