Re: [Xen-devel] [GSOC-2019] Problem with initializing crossbar on bb-x15 in dom0

[Iain Hunter <drhunter95@xxxxxxxxx>]

Hi Denis,
That is about as far as I got....

The driver to handle crossbar is
https://github.com/torvalds/linux/blob/master/drivers/irqchip/irq-crossbar.c
The documentation is
https://github.com/torvalds/linux/blob/master/Documentation/devicetree/bindings/arm/omap/crossbar.txt

This is a TI specific driver as far as I know so Xen will probably not
understand it.
Iain

On Wed, 3 Jul 2019 at 16:34, Denis Obrezkov <denisobrezkov@xxxxxxxxx> wrote:
>
> Hello,
> I am trying to run xen and I have a problem:
> https://pastebin.com/U0gch9us on line 190-193
>
> So, it seems that Linux can't discover the irq domaing for crossbar
> interrupt controller when running in dom0, but it has no problem when
> running baremetal.
>
> Here is the DT log with xen:
> https://drive.google.com/open?id=15YTsCKYUTbG2i-siWezJXKWuG0H1VfQz
> (an older version with another mistake)  It can be seen that external
> interrupts are connected to the crossbar interrupt controller.
>
> I found some information about irq domains and crossbars:
> https://www.kernel.org/doc/Documentation/IRQ-domain.txt
>
> it seems to me that it is possible to give control on the crossbar to
> dom0, though, I don't really understand what's happening.
>
> --
> Regards, Denis Obrezkov
>

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