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


  • To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Iain Hunter <drhunter95@xxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, Hunyue Yau <hy-gsoc@xxxxxxxxxxxxxxx>
  • From: Denis Obrezkov <denisobrezkov@xxxxxxxxx>
  • Date: Wed, 10 Jul 2019 20:54:02 +0200
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  • Delivery-date: Wed, 10 Jul 2019 18:54:20 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

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
-- 
Regards, Denis Obrezkov

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