Re: [Xen-devel] [RFC for-4.8 v2 6/7] xen/device-tree: Add an mmio-sram bus

["Edgar E. Iglesias" <edgar.iglesias@xxxxxxxxxx>]

On Mon, Jun 06, 2016 at 07:05:20PM +0100, Julien Grall wrote:
> Hi Edgar,
> 
> On 03/06/16 14:29, Edgar E. Iglesias wrote:
> >From: "Edgar E. Iglesias" <edgar.iglesias@xxxxxxxxxx>
> >
> >Add an mmio-sram bus that prevents sram sub areas from
> >being re-mapped. These sub-areas describe allocations and
> >not mappings.
> 
> mmio-sram is not a bus and the region below should point to a valid physical
> address.
> 
> So why do you want that?

Hi,

Yes, I briefly mentioned this in the cover letter. It's a hack
to avoid the mapping of sub allocations. The regions under mmio-sram
point to valid addresses but they point into the same space that
the outer mmio-sram node maps in. They also don't need to be page
aligned. AFAICT, Xen should ignore these sub-regions allthough I
think things work anyway (at least with my dts).

Maybe I should just drop this until we have a real problem or
come up with a nicer way of dealing with this.

Cheers,
Edgar





> 
> Regards,
> 
> -- 
> Julien Grall

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