I'm trying to use one the two switch on the Sabre board in u-boo to select the boot device, either boot from SD-card or network.
But I'm stuck at the gpio part. I'm not able to read the value of either of the switches.
According to Definitive GPIO guide - Studio Kousagi Wiki the iopin number will be 138 for Sw3 (usr_bt1). I know that the source calculates on a imx6 but I assume that the calculations for the iopin is the same on the Imx7
I have tried, in u-boot:
"gpio i 138"
but the value returned is always 0.
I have also browsed through the u-boot code, but I was not able to find anything regarding gpio in the imx7. This leads me to believe that it isn't configured. Is this true? And if not are there any example/guides on how to enable it?