MCIMX7Sabre board blank screen

[jeffhubeny]

I have an MCIMX7SABRE board. I inserted the sd card that came with it and powered it on. A monitor is plugged into the HDMI port and I can see the monitor signal light is lit, but the screen is black.The green power led is lit. The yellow led next to the ethernet port is lit, but I get nothing on the screen. I tried a different monitor, but still nothing. I tried plugging in a windows laptop with putty to the debug port. The two ports show up in device manager as COM3/COM4, but when I set putty to COM3 with 115200-8n1 and click open I get nothing. I checked the SD card to see if it really contains an OS and it does.

Is the board bad, or is there something I've overlooked?

[Rita_Wang]

Hi,

Could you tell me which version BSP are you using?
Have a great day,
Rita

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[Rita_Wang]

Hi，

You need to set the "video=mxcfb0:dev=hdmi,1920x1080M@60,if=RGB24" for an HDMI display when the u-boot boot up in the command line.
Have a great day,
Rita

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[marius_grigoras]

And make sure your monitor is with HDMI cable and not with a vga-to-hdmi adaptor (the low-level display driver will not work).

[jeffhubeny]

I don't get any u-boot command line to type on. The debug serial port shows up in device manager, but putty won't connect to it, so I can't get to anything that lets me enter the video options.

I tried a third newer monitor that definitely supports 1920x1080, but no luck. It's hdmi to dvi, but no vga converters involved. I tested the hdmi-dvi cable with a laptop that has Linux on it just to make sure it's ok.

The image I'm trying to boot came with the board. It's labeled "MCIMX7SABRE Linux L4.1.15_1.2.0 GA 110-78016X"

Thanks for your help. Someone with the same board is going to ftp a Linux image to me. I'm going to try their image too.

[jeffhubeny · Accepted solution]

Just to close the loop, using a different sd card image resolved my problem. Now both the serial port and the hdmi screen work. This issue is resolved. Thanks for your help.