Re: [Xen-devel] [PATCH 0/2] Raspberry Pi 4 support

[Stewart Hildebrand <Stewart.Hildebrand@xxxxxxxxxxxxxxx>]

On Wednesday, July 24, 2019 10:47 AM, Julien Grall <julien.grall@xxxxxxx> wrote:
>Also, there a few other interesting problems with the RPI4 that will need to be
>solved:
>    1) The UART is sharing the same page as some other devices. We either
>need
>to blacklist them so they can't be used by a guest (including Dom0), or we
>need
>to trap and sanitize access.

It's also sharing an IRQ with the other "aux" peripherals. I will send a patch 
to blacklist for now.

>    2) Xen is mapping memory using 1GB mapping. AFAIK, there are 1GB slot
>that
>is shared between RAM and MMIO. This will result to cache incoherency.

Thanks for the info. There is also a 1GB slot shared with GPU [1].

Stewart Hildebrand
DornerWorks, Ltd

[1] https://github.com/raspberrypi/linux/issues/3093#issuecomment-515438627

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