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

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

Great to hear!

On Fri, 22 Aug 2014, Suriyan Ramasami wrote:
> 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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