WIP: IPU and HDMI drivers for i.MX6

[Oleksandr Tymoshenko]

> On Jul 20, 2015, at 4:50 AM, Mikaël Urankar <mikael.urankar at gmail.com> wrote:
> 
> 2015-07-20 2:33 GMT+02:00 Oleksandr Tymoshenko <gonzo at bluezbox.com>:
>> Hello,
>> 
>> 
>> 
... skipped ...
>> Patch was tested on Hummingboard so any testing on other i.MX6
>> devices is appreciated
> 
> Hi,
> 
> Great work, thank you!
> 
> I've tried on a cubox i4pro, the boot hangs after probing the video mode:
> http://mikael.urankar.free.fr/FreeBSD/cubox_hdmi.txt
> 
> The boot also hangs if no hdmi/monitor are connected, last lines printed are:
> VT: initialize with new VT driver "fb".
> fb1: failed to parse EDID

Looks like i4pro has two IPU enabled and my code does not handle
this case well yet. New patch has hack that make sure only IPU1 is attached.

https://people.freebsd.org/~gonzo/arm/patches/imx6-ipu-hdmi-20150720.diff