unable to export gpio into sysfs

nishanth_ · ‎05-03-2021

Hi,

On a custom board that is based on Imx8m mini SOM, when I try to export a gpio that is connected to an LED, I get the below error.

nishanth__0-1620048098528.png

Whereas for a similar gpio, that is connected to an different LED, the export happens successfully and I am able to toggle the LED as expected.

nishanth__1-1620048197071.png

While referring processor data sheet(https://www.nxp.com/docs/en/data-sheet/IMX8MMIEC.pdf), below are the differences.

For pin 80,

nishanth__2-1620048345575.png

and for pin 87,

nishanth__3-1620048438008.png

Can someone please share some info on what could be the possible reasons for this behavior.

Thanks in Advance.

igorpadykov · ‎05-03-2021

Hi Nishanth

one can check if NAND_READY pad is used by other module like nand in below example:

Best regards
igor