Indeed $ find /proc/device-tree/ | grep sdio /proc/device-tree/soc/gpio@7e200000/sdio_pins /proc/device-tree/soc/gpio@7e200000/sdio_pins/name /proc/device-tree/soc/gpio@7e200000/sdio_pins/phandle /proc/device-tree/soc/gpio@7e200000/sdio_pins/brcm,function /proc/device-tree/soc/gpio@7e200000/sdio_pins/brcm,pins /proc/device-tree/soc/gpio@7e200000/sdio_pins/brcm,pull /proc/device-tree/soc/gpio@7e200000/sdio_pins/linux,phandle
However I'm using dtoverlay=sdio,poll_once=off Does the poll_once change anything? On Ubuntu Core 18 find /proc/device-tree | grep sdio Shows empty -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1823655 Title: Second SD card on RPi3 CM3 on Ubuntu Core 18 does not work To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-raspi2/+bug/1823655/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs