Re: Modifying xenfb colour depth from Android domU

[Gareth Stockwell <gareth.stockwell@arm.com>]

On 28/08/14 11:15, David Vrabel wrote:
> On 28/08/14 10:21, Gareth Stockwell wrote:
>> I'm facing some problems getting xenfb to work with an Android domU, on
>> ARM.
>>
>> The issue is that the framebuffer is created with a depth of 32bpp,
>> while the Android guest is rendering RGB565.
>>
>> I tried to fix this by using the fbdev API to request a change of pixel
>> format, during the Android startup:
> I'm not very familiar with the xenfb driver but it looks like it would
> all just work provided you have a backend that supports feature-resize.
>
> What backend are you using?
>
> David
>
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> http://lists.xen.org/xen-devel
>

I've tried with both VNC and SDL backends.

If I read correctly the xenstore fragment below, it's reporting that the
VNC backend does support feature-resize, but FBIOPUT_VSCREENINFO still
fails as I described previously.

root@dom0:~# xenstore-ls /local/domain/0/backend/vfb
2 = ""
  0 = ""
   frontend = "/local/domain/2/device/vfb/0"
   frontend-id = "2"
   online = "1"
   state = "2"
   domain = "ree"
   vnc = "1"
   vnclisten = "0.0.0.0"
   vncdisplay = "2"
   vncunused = "1"
   sdl = "0"
   opengl = "0"
   feature-resize = "1"
   hotplug-status = "connected"

Gareth



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