Re: [Xen-devel] XEN/ARM XENFB howto

[Suriyan Ramasami <suriyan.r@xxxxxxxxx>]

Thank you so much Stefano! It works amazingly well! I will probably
update the wiki as well.

On Thu, Aug 21, 2014 at 3:22 PM, Stefano Stabellini
<stefano.stabellini@xxxxxxxxxxxxx> wrote:
> On Mon, 18 Aug 2014, Suriyan Ramasami wrote:
>> Hello,
>>    This possibly could be a resend, as I did not see my post (that I
>> emailed out on Aug 17).
>>    I am looking for documentation on how to use XENFB on ARM. I did
>> see a post dated Dec 2013 from Peter
>> (http://lists.xen.org/archives/html/xen-users/2013-12/msg00061.html)
>> and discussions with Steffano and
>> Ian on how to achieve it. But, its not clear to me.
>>
>>    I am trying to achieve this on the Odroid-XU (ARM based Exynos
>> 5410). I am looking for the following:
>>
>> 1. qemu compilation upstream - I believe this has all the bits to
>> achieve it. Are there any special compile options. I ask this, as
>> qemu-system-arm seems to be spawned in dom0 with -M xenpv and I am not
>> able to compile this machine in qemu.
>> I do configure to build qemu with --enable-xen --target-list
>> arm-softmmu and the other options as mentioned in
>> http://wiki.xen.org/wiki/QEMU_Upstream#Building_your_own_qemu.
>>
>> Note that I am not trying to cross compile but am compiling qemu natively.
>
> You just need this patch series:
>
> http://marc.info/?l=xen-devel&m=140690717224942
>
> then you should be able to build QEMU normally as part of the Xen build
> process. The binary created is actually still called qemu-system-i386
> even though we are not actually doing any x86 emulation.
>
Thanks for this. Just for the record, I used yout partch as in ->
http://www.gossamer-threads.com/lists/xen/devel/338875 and that worked
like a charm.
>
>> 2. What are the options in the domU2 config file to achieve this.
>
> The option is called vfb, see man xl.cfg.
>
Thanks the vfb option did it! Its nice to launch xl create -V <cfg
file> and see the console!

>
>> 3. Any thing else ... Like when domU2 is created, what mice/keyboard/fb
>> messages to look for, or in dom0 what backend driver output to look
>> for. Does this need a xorg.conf file etc ...
>
> You need CONFIG_XEN_FBDEV_FRONTEND in DomU and CONFIG_XEN_GNTDEV in
> dom0. You can try it by simply using fbcon in the guest, see
> Documentation/fb/fbcon.txt under Linux.
I did have the configs set approproately, and fbcon.txt was helpful too!

Thanks once again,
- Suriyan

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