[PATCH] arm: introduce a DTS for Xen unprivileged virtual machines

On Thu, 20 Sep 2012, Ian Campbell wrote:

quoted

Versatile Express is flexible enough to be a good base for our own
virtual machine platform, especially if the maintainers keep an eye on
getting everything through DT and not expecting devices just to be there
;-)

Perhaps what we want is a stricter subset of the stuff in mach-vexpress
then. But if so then this should be expressed both in the DT and in the
code, not just papered over by declaring things compatible when they are
not.

But it is already expressed in the DT, by removing all the device nodes
we don't emulated. And it is already expressed in the code, by fully
discovering peripherals via DT, therefore not trying to initialize
non-present devices.

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+	gic: interrupt-controller at 2c001000 {
+		compatible = "arm,cortex-a9-gic";

Don't we mean "arm,cortex-a15-gic" here? That's what we actually
provide. I'm not sure how the a9 and a15 differ.

The GIC that comes with vexpress is a9 compatible.

The GIC which Xen emulates is the one which matters here though, and
that is an a15.

The a15 gic is still a9 compatible. OK to be precise I am going to add
"arm,cortex-a15-gic", but I cannot really remove "arm,cortex-a9-gic".