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Michael P

Hdmi out from zybo

Question

Hi,

I want to make a video processing ip on hdmi with Nexys Video. The hdmi signal will be generated by a Digilent Zybo board.

I took the prebuilt images from petalinux repo for zybo. The Linux boots and display the terminal on a regulator monitor.

Then, I connected the hdmi out from zybo to hdmi in port on nexys and monitor to nexys video hdmi out. For start, I just turned on the board with default configuratioin from qspi. The default configuration is a hdmi pass through because it works when I connect the input on nexys video to a raspberry pi. So,  the monitor should display the terminal, but it doesn't.

 

Taking a look at what dmesg prints, I've fount some interesting errors like:

Registering SWP/SWPB emulation handler
[    1.068461] [drm] No max horizontal width in DT, using default 1920
[    1.073394] [drm] No max vertical height in DT, using default 1080
[    1.078249] OF: graph: no port node found in /amba_pl/xilinx_drm
[    1.082930] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    1.088193] [drm] No driver support for vblank timestamp query.
[    1.099048] mmc0: new high speed SDHC card at address aaaa
[    1.103540] mmcblk0: mmc0:aaaa SC16G 14.8 GiB
[    1.108887]  mmcblk0: p1 p2
[    2.109425] cdns-i2c e0004000.i2c: timeout waiting on completion
[    2.114099] [drm] Cannot find any crtc or sizes
[    2.117637] [drm] Initialized xilinx_drm 1.0.0 20130509 for amba_pl:xilinx_drm on minor 0

Then, it prints continuously this:

 cdns-i2c e0004000.i2c: timeout waiting on completion
[   11.479277] cdns-i2c e0004000.i2c: timeout waiting on completion
[   11.483903] [drm] Cannot find any crtc or sizes
[   11.487524] [drm] Initialized xilinx_drm 1.0.0 20130509 for amba_pl:xilinx_drm on minor 0

What is wrong with it? How could I fix it?

On serial, the nexys video says : "Showing DVI input".

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4 answers to this question

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I'm not sure about this but I would look in to the HPD signal, as far as I know in the Nexys Video demo is set up so that the HPD is a pass-trough signal which might interfere with the zybo z7 design. I will ask our colleague who has more experience in HDMI if he has some input regarding your question.

-Ciprian

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