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

[Michael Brown]

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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