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

[bharat gohil <ghl.bhrt@xxxxxxxxx>]

On Mon, Feb 26, 2018 at 3:51 PM, Julien Grall <julien.grall@xxxxxxx> wrote:
> 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.
>
Ok. Got it.
> 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.
>
Thanks lot for your hint. I am able to get login prompt for Dom0.

> Cheers,
>
> [1]
> https://lists.xenproject.org/archives/html/xen-devel/2017-04/msg00991.html
>
>
> --
> Julien Grall

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