Re: [Xen-devel] [PATCH RFC 00/19] arm64 EFI stub

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2014-07-02 at 12:52 +0100, Ian Campbell wrote:
> On Sat, 2014-06-28 at 02:25 +0100, Roy Franz wrote:
> > 2) Is it valid to start XEN with a device tree that only contains 
> > multi-boot and EFI info? (As would be the case if the stub doesn't get a 
> > device tree as input.)
> 
> This would be the case when running on an ACPI system I guess? In which
> case everything which would be in the DT would instead be in the ACPI
> tables, which is something Naresh is working on I think.
> 
> >   Currently this isn't supported, some libfdt 
> > functions are missing, so I'm checking if this is desired before I add 
> > that.
> 
> Unless this==booting with ACPI I'm not sure what it is and if its ACPI
> I'm not sure what needs to be done in the stub, could you explain
> please?
> 
> (I have a feeling I'm missing something obvious)

Ah, I think this is from the final patch:

> +    if ( fdtfile->ptr )
> +        fdt_size = fdt_totalsize(fdtfile->ptr);
> +    else
> +    {
> +        /* RFRANZ_TODO - missing fdt_create_empty_tree() in libfdt. */
> +        return NULL;
> +    }


I don't think we currently support booting with no FDT at all, and even
in the ACPI world we would get one. So I think this would be an error.
IOW no need to worry about it.


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