On Mon, Sep 30, 2013 at 07:27:58PM +0100, Grant Likely wrote:
> > So ... I guess that would modify the stub behaviour to:
> > - Look for an FDT_GUID configuration table.
> > - If there, use it.
> > - If not there, require one to be loaded based on command line.
>
> Create a mostly empty one for passing freeform data to the kernel
> proper; this is what it will look like on ACPI systems.
OK. So we push the actual error condition of missing tree down to stub?
Makes sense.
> > The x86 code uses bootparam to pass the kernel command line.
> > Could we use the FDT exists) for the kernel command line
> > too? This would make more code shared between x86 and ARM*, since
> > otherwise we would need to explicitly implement (UCS?) command line
> > passing to stub?
>
> Yes, I think that makes sense. That also means GRUB will need to
> always create an FDT, even if it is empty.
Yes. This would be my preference.
> The other option would be to pass the command line via the LoadOptions
> from the EFI_LOADED_IMAGE protocol. I believe that is what Roy's
> patches currently rely on for getting a command line.
Since the current code doesn't UEFI-wise "load" the stub image, we'd
effectively need to reverse-reconstruct GRUB's runtime environment,
which I really wouldn't like.
/
Leif
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