No DP output after booting.

Question

I'm using the stock linux image from the instruction manual to get the Ultra96 v2 started. I'm using the active DP to HDMI cable from amazon that was suggested. My ultra96 boots up and I see a message that it's starting to boot along with cursor. Then it goes black and there's no image. So the cable works, but the linux doesn't show a graphical nor terminal view when booted up.

I've reformatted the sd several times but still the same issue.

Is the only way to get an image up is to recreate my own petalinux from scratch? Or am I missing some settings first?

Thanks,

Ril

bhfletcher · Accepted Answer

Yes, that is the exact cable that I use successfully all the time. I'm not sure why the discrepancy. Are you certain you are using the Ultra96-V2 image? Would you like to try the latest one that isn't posted publicly yet?

http://avnet.me/ultra96-v2-oob-8GB

Do you have the JTAG/UART Pod connected? What do you see in the terminal?

If you were trying to boot an Ultra96-V1 image on Ultra96-V2, then it would fail during the boot process after configuring the hardware. That would make it appear like the display was about to work but then fail. Likewise, if you put the 16GB Delkin image on a slightly smaller SanDisk card, then that isn't always clean either, which causes the Linux boot to fail. Again, the display would start to work but then fail when the Linux boot failed.

Bryan

bhfletcher · Answer

Will you please let us know which specific miniDP-to-HDMI Active Adapter that you are using?

Does your monitor support one of these 3 resolutions? Do you have a different monitor that you could try?

1920x1080 or
1280x720

If the board is booting, then re-imaging the SD Card won't help. The most common issues we see is that the Adapter isn't really Active, or the Adapter just doesn't work, or the monitor doesn't support the limited resolution.

Bryan

bhfletcher · Answer

The Ultra96-V2 and V1 both drive the DisplayPort natively from the MPSoC. Therefore, it has the same limitations as any other board or system that does the same thing. You can read about this in multiple places:

https://www.xilinx.com/support/answers/71773.html

https://www.xilinx.com/support/answers/71774.html

https://www.xilinx.com/support/answers/67462.html

https://forums.xilinx.com/t5/Video/Display-Port-to-HDMI-adapters/td-p/838099

Also, similar resolution limitations for the specific design, similar to the ZCU102 TRD: https://xilinx-wiki.atlassian.net/wiki/spaces/A/pages/126320678/Zynq+UltraScale+MPSoC+Base+TRD+2019.1

Monitor with DisplayPort or HDMI input supporting one of the following resolutions: