On Tue, 2007-10-16 at 10:20 +0200, Claes Lilliesk├Âld wrote:
> Hello,
> I'm looking for a way to run Linux on top on an RTOS on a PowerPC 750 
> based system.
> To achieve this, at least the following need to be done:
> 1. Port the hypervisor interface to the RTOS.
> 2. Adapt the XEN Linux to be able to run on PowerPC 750. 
> The current PowerPC support is only for PowerPC 970 from what I
> understand.

Correct. Also note that Xen's PowerPC support depends on the hardware
virtualization extensions found in server architecture PowerPC such as
970. The 750 lacks these features.

> I'd be grateful if you could comment on if this is possible, and how
> it should be done.

I don't know of anybody doing an open source hypervisor for 750. I think
there are a few commercial solutions if you want to deploy something

However, there are a few people looking at KVM on embedded PowerPC, so
I'm CCing kvm-ppc-devel. So far we've been thinking mostly about Book E
(440 and e500), but if you're interested in developing support for 750
that would be a good place to discuss. Currently we have an unmodified
440 Linux kernel booting as a guest, but userspace doesn't work yet.

I think KVM makes more sense for embedded PowerPC because we can reuse
Linux's existing support for the huge variety of cores/chips/boards.

By the way, what RTOS are you using, and what sort of real-time and MMU
requirements do you have?

Hollis Blanchard
IBM Linux Technology Center

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