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.

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.

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

For pin 80,

and for pin 87,

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