[U-Boot] [PATCH v2 1/2] mx6sabresd: Avoid hang when HDMI cable is not connected

[Eric Nelson <eric.nelson@boundarydevices.com>]

Hi Fabio,

On 09/13/2013 11:11 AM, Fabio Estevam wrote:
> Hi Eric,
>
> On Fri, Sep 13, 2013 at 11:51 AM, Eric Nelson
> <eric.nelson@boundarydevices.com> wrote:
>
>> Nice!
>>
>> So, how should we get this done?
>>
>> We have support for parsing individual lines of DT, and the primary
>> thing(s) needed by U-Boot's display are in the timing block of the
>> device tree, but I wonder whether it makes sense to implement a
>> full parser for that, or a simpler parser for fb_videomode.
>
> Looks like the parser for fb_videomode is enough.
>
> I am not familiar with the usage of device tree in U-boot yet.
>
> How do other SoC families handle the video display-timings in dt
> currently in U-boot?
>

AFAIK, with a full device-tree blob, but without any means of
updating it, which ends up in the same place as the compiled-in
settings.

In order to configure for a new kernel, you have to "compile"
the DTB and save it to the boot media.

This is a perfectly reasonable thing to do late in the development
process, but makes connecting new panels cumbersome.

Regards,


Eric