Apalis TK1 - Unable to read GPIO pins via K20

[hfranco.tx]

Hi @avionics,

@avionics

dmesg | grep k20
apalis-tk1-k20 spi1.1: Unsupported firmware version in both the device as well as the local firmware file.

After that I took my older firwmare.bin which is version 1.4 and copied it over yours file and rebooted board. It flashed it correct again but GPIO still does not work.

Thanks for the testing. So we now know that updating the bin is not enough, the .ko should be updated as well.

@avionics

Can you please advise if there is a way for you guys to get us either BSP 5 with support of 10.1 LVDS display or modified L4T 2.8 with functional GPIO block in K20 ?
We do have too many of these boards and also our goal is to use specifically TK1 because we use OpenGL graphics a lot in our program so NVIDIA is ideal candidate for that purpose for us.
TK1 so far demonstrated much better GPU speed vs T30 and we happy with outcome except GPIO in K20.

Ok, I will test if I can update the kernel modules alongside the binary, I’ll reply to you when I have something. About the LVDS though, I made a quick search and it appears that it’s possible to make it work on the downstream kernel, not the upstream. You will only need to activate the LVDS on your device tree.

Have you already tried that?

There is a reference on our website: https://developer-archives.toradex.com/knowledge-base/display-output-resolution-and-timings-linux#Apalis_TK1_LVDS_Output

I’ve also find some tickets about this topic:

• Apalis TK1 LVDS Configuration
• Apalis-TK1 LVDS drive strength not set by device tree
• LVDS on Apalis TK1 and IXORA

Best Regards,
Hiago.