Re: [Xen-devel] [GSoC-2019] About the crossbar and xen

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Wed, 10 Jul 2019, Denis Obrezkov wrote:
> Hello,
> 
> so, I think I understood why uart doesn't work, that's because all the
> irqs are routed to the crossbar not to GIC, so, xen can't deal with them.
> 
> One thing I am concerned of is the:
>       interrupt-controller@48281000 {
>               compatible = "ti,omap5-wugen-mpu", "ti,omap4-wugen-mpu";
>               interrupt-controller;
>               #interrupt-cells = <0x00000003>;
>               reg = <0x00000000 0x48281000 0x00000000 0x00001000>;
>               interrupt-parent = <0x00000002>;
>               phandle = <0x00000008>;
>       };
> And this is an interrupt-parent for the crossbar. So, it is not clear
> for me how it participates in interrupt processing. Any thoughts?
> 
> Here is my device tree: https://pastebin.com/Xec57Jcr
 
Hi Denis,

If you look at the GIC node (compatible = "arm,cortex-a15-gic";) the
phandle is:

  phandle = <0x00000002>;

I think that means that interrupts go to the GIC via Crossbar; i.e. the
parent interrupt controller of Crossbar is the GIC.

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