[fedora-arm] pandaboard video output

[Peter Robinson]

On Fri, Sep 7, 2012 at 12:08 AM, Jon <jdisnard at gmail.com> wrote:
> On Tue, Aug 28, 2012 at 1:51 AM, Peter Robinson <pbrobinson at gmail.com>
> wrote:
>> On Tue, Aug 28, 2012 at 3:55 AM, Jon <jdisnard at gmail.com> wrote:
>>>>> #
>>>>> insmod
>>>>> /lib/modules/3.5.2-3.fc17.armv7hl.omap/kernel/drivers/staging/omapdrm/omapdrm.ko
>>>>> Error: could not insert
>>>>> module
>>>>> /lib/modules/3.5.2-3.fc17.armv7hl.omap/kernel/drivers/staging/omapdrm/omapdrm.ko:
>>>>> Unknown symbol in module
>>>>
>>>> you should just do "modprobe omapdrm" not insmod the .ko as it takes
>>>> care of its deps.
>>>>
>>>
>>> That worked, the omapdrm module loaded with modprobe.
>>> Unfortunately that does not cause the HDMI video to suddenly start
>>> working.
>>> Also, the path in sysfs was not present after loading the module:
>>>
>>> /sys/devices/platform/omapdrm.0
>>
>> Thinking back to the 3.5 dev cycle in rawhide there was quite a bit of
>> churn in the OMAP video stuff to do with the DSS module, it's possible
>> we'll need to tweak the F-17 kernel build. Not sure if I'll get time
>> to do that this week.
>>
>> I want to bring the config restructure back to F-17 but OMAP at least
>> has some issues with USB on that build so I need to get the time to
>> test all the various HW devices we vaguely support such as Panda,
>> Beagle, Trimslice, Highbank, and VExpress. We know the imx at least
>> vaguely works. For 3.5+ we really need to move to DeviceTree and I
>> wonder if that isn't at least part of the issue with the video on 3.5
>>
>> Peter
>
> Howdy,
>
> Diffed the configs for 3.4.2-3 and 3.5.2-3.
>
> The 3.4 kernel had these kernel config's:
>
> CONFIG_PANEL_DVI=m

That would likely affect DVI but not HDMI.

> CONFIG_SND_OMAP_SOC_HDMI=y
> CONFIG_SND_OMAP_SOC_OMAP4_HDMI=y

They're the sound components for digital sound over the HDMI port so
won't affect video.

> Could that contribute to the lack of HDMI/DVI-D on pandaboard on the more
> recent kernels?
> Possibly in addition to the omapdrm module not loading during boot?

Partially, I'm just looking at it now while I think of it.

Peter