Hi all,
I have been spinning my wheels for two days trying to discover how to
enable MMC1 on a CM3. This is the one on GPIO22-27. I can boot Rasbian
on the CM3 and it inits the MMC1 and its pins just fine. I can
read/write to my SD card from it etc. However, when I build yocto it
leaves the GPIOS22-27 in gpio mode and does not set them to MMC1 mode.
I have tried changing the device tree as described here:
https://stackoverflow.com/questions/44702426/how-to-setup-an-own-device-tree-for-a-raspberrypi-in-yocto
That compiles and add the .dtbo to my build, but still the GPIOS are not
set to MMC1 mode.
cat /sys/kernel/debug/pinctrl/*gpio*/pinmux-pins
Pinmux settings per pin
Format: pin (name): mux_owner gpio_owner hog?
....
pin 22 (gpio22): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 23 (gpio23): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 24 (gpio24): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 25 (gpio25): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 26 (gpio26): (MUX UNCLAIMED) (GPIO UNCLAIMED)
pin 27 (gpio27): (MUX UNCLAIMED) (GPIO UNCLAIMED)
.....
I have looked at:
https://ralimtek.com/raspberry%20pi/electronics/software/raspberry_pi_secondary_sd_card/
Any ideas of where to look next to turn on the sdio would be appreciated!
Chuck
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