Re: [Xen-devel] [PATCH] xen/arm: Rework the way to compute dom0 DTB base address

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Mon, 2013-05-27 at 16:44 +0100, Julien Grall wrote:
> It's also possible to enable CONFIG_ARM_APPENDED_DTB which checks during
> decompression stage if there is an appended DTB. But it's for the old
> bootloader (ie which doesn't set the DTB address in r2) and won't allow
> to boot Linux either on bare metal or on XEN.

We don't want to rely on APPENDED_DTB -- it is considered a hack...

> Your solution is the best, but, if I didn't miss something, it means
> some rework on the Linux decompression stage. I think, this is also on
> issue with all the bootloaders.

Yes. For better or worse the defacto standard way of doing this on ARM
platforms today is for the bootloader (or the bootscript) to contain
some magic addresses which "works". Pushing those into Xen isn't ideal
but its the best option right now.

Ian.


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