Micro-SD card on custom jetson nano

There are only few things that are necessary for enabling the sdcard slot.

  1. controller has to be enabled.

  2. cd-gpios to detect the card

  3. vmmc-supply to provide the sdmmc the power. If this one is missing, then it will just give you no response in log.

And all actually for later user to enable sd slot on sdmmc3, this thread includes all the patches needed.