[meta-freescale] i.MX6q Boot failure using MACHINE=nitrogen6x

[Tarek El-Sherbiny]

Hi Eric,

On the command line arguments I had dmfc=3. That was set to improve the IPU
performance as I need to play up to 16 streams simultaneously.
When I removed this option the boundary kernel is booting without the
horizontal lines problem. HDMI to DVI is still not working.

cat /proc/cmdline
console=ttymxc1,115200 video=mxcfb0:dev=hdmi,1920x1080 at 60 fbmem=24M,10M
root=/dev/mmcblk0p1 rootfs=ext2 rw rootwait enable_wait_mode=off
consoleblank=0 bpp=32


This is fine for know but it would be nice to understand why dmfc is
conflict with boundary kernel.
Also I'm not sure how is this going to affect the IPU performance!
Hope you have an answer to this question so I can fully test the
application.
https://lists.yoctoproject.org/pipermail/meta-freescale/2013-December/005854.html

Thanks,
Tarek



The command line argument doesn't help:

console=ttymxc1,115200 video=mxcfb0:dev=hdmi,1920x1080 at 60 fbmem=24M,10M
root=/dev/mmcblk0p1 rootfs=ext2 rw rootwait enable_wait_mode=off
consoleblank=0 dmfc=3 bpp=32

Also



On Tue, Dec 3, 2013 at 4:40 PM, Eric Nelson <eric.nelson at boundarydevices.com
> wrote:

> Hi Tarek,
>
>
> On 12/03/2013 08:12 AM, Tarek El-Sherbiny wrote:
>
>> Hi Eric,
>>
>> root at nitrogen6x:~# cat /sys/class/graphics/fb0/modes
>> S:720x480p-60
>> S:720x576p-50
>> S:1280x720p-50
>> S:1280x720p-60
>> S:1280x1024p-60
>> V:1024x768p-75
>> V:1024x768p-70
>> V:1024x768p-60
>> V:800x600p-75
>> V:800x600p-72
>> V:800x600p-60
>> V:640x480p-75
>> V:640x480p-72
>> V:640x480p-60
>> U:720x400p-70
>> D:1360x768p-60
>> D:1280x720p-60
>> V:640x480p-60
>>
>
> This looks like a pretty standard set of modes for a
> 4:3 aspect ratio monitor.
>
>
>  root at nitrogen6x:~# cat /sys/class/graphics/fb0/mode
>> S:1280x1024p-60
>>
>
> This doesn't match one of the CEA modes:
>         https://github.com/boundarydevices/linux-imx6/
> blob/boundary-imx_3.0.35_4.1.0/drivers/video/mxc/mxc_edid.c#L41
>
> Can you boot with this command-line argument?
>         mxc_hdmi.only_cea=0
>
> I think you'll either need that or you'll need to choose a
> display resolution from the list. It appears that your monitor
> and CEA both like 1280x720 at 60, though you'll likely get
> letter-boxing.
>
> Regards,
>
>
> Eric
>



-- 
*Tarek*
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