I've added an SD card slot to my Raspberry CMIO board and verified that the SD card shows up when using the latest Raspbian image and the dtoverlay=sdio config.txt option. Seems to work fine.
Then installed Ubuntu Core 16, added dtoverlay=sdio, verified that /proc /device-tree shows the overlay but no further luck. The SD card does not show up. Am I missing something? Can you verify that it works for you with latest core 16 and kernel 4.4.0-1126-raspi2? -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-raspi2 in Ubuntu. https://bugs.launchpad.net/bugs/1823655 Title: Second SD card on RPi3 CM3 on Ubuntu Core 18 does not work Status in linux-raspi2 package in Ubuntu: In Progress Status in linux-raspi2 source package in Bionic: New Bug description: As suggested in following thread; https://forum.snapcraft.io/t/second-sd-card-on-rpi3-cm3-with-ubuntu- core-18/10465 a bug report. The configuration works for a Ubuntu Core 16 device. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-raspi2/+bug/1823655/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp