Re: [Xen-devel] ARM64:Porting xen to new hardware

[Julien Grall <julien.grall@xxxxxxx>]

Hi,

What I meant by using '>' for quoting is all my reply should be prefixed 
with '>'. You write your reply normally.
You can do that in gmail by switching the e-mail from HTML to plain text.

On 26/02/18 07:31, bharat gohil wrote:
> On Thu, Feb 22, 2018 at 4:57 PM, Julien Grall <julien.grall@xxxxxxx 
> <mailto:julien.grall@xxxxxxx>> wrote:
>     This looks quite wrong to me. By modifying the interrupt parent
>     property, you also modify which interrupt controller will be used
>     for routing the interrupt. This is probably the reason of the hang
>     you mention below.
>
>     What are the interrupts controller you have on your platform?
>
>  >It has interrupt controller which change the polarity of SPI IRQ 
> before redirect to GIC-400.
>  >In DTB debug, I got following trace,
>  >(XEN) irq 0 not connected to primary controller. Connected to 
> /intpol-controller@10220a80.
>  >I think Xen skip interrupt controller(if other than GIC) while domain 
> creation.
Xen will not try to map interrupt that are routed to a different 
interrupt controller. This is because we don't know how to translate the 
property 'regs' for those interrupts.
>  >Do you have suggestion to solve this?
>  >Do I need to support custom IRQ controller in Xen or hard code the 
> custom controller register in Xen and modified DTB with GIC as primary 
> controller?
If any interrupts used by Xen (e.g UART) are behind that custom IRQ 
controller, then you would need to add the driver in Xen.
There was an attempt to provide a framework for hooking custom IRQ 
controller in Xen (see [1]).
You could probably look for doing something similar for your board.

Cheers,

[1] 
https://lists.xenproject.org/archives/html/xen-devel/2017-04/msg00991.html

--
Julien Grall

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