Public bug reported: [Impact]
* Currently it is not possible to use the SLB9670 TPM module with Ubuntu Core since we do not ship the required devicetree overlay to enable it https://github.com/raspberrypi/linux/commit/c28ac2dc08bd73963f953a757a3362c64b5524ed and there is no way for snaps to easily add their own devicetree overlay. Finally it is not practical to expect Ubuntu Core users to have to build and maintain their own kernels just to support a particular hardware device. For background discussion, refer to this thread on the snapcraft forums - https://forum.snapcraft.io/t/guidance-on-snap-interface-to-load-a -device-tree-overlay-on-rpi-core18/10106/11 * Once this overlay is added, then users simply need to modify the boot config.txt to enable the overlay to be loaded automatically. In the future, snapd might also enable support so this can be managed by snapd via snap system configuration. [Test Case] * Boot a RPi with a SLB9670 connected, modify /boot/config.txt to specify dtoverlay=tpm-slb9670, then load the tpm_tis_spi module and /dev/tpm0 should the be available. [Regression Potential] * Almost zero chance of regression potential since this is simply adding a new overlay to the kernel. This is not loaded automatically so there is no real chance of regression. [Other Info] * All that is required for this SRU is to merge https://github.com/raspberrypi/linux/commit/c28ac2dc08bd73963f953a757a3362c64b5524ed to the current bionic raspi kernel branch. ** Affects: linux-raspi2 (Ubuntu) Importance: Undecided Status: New -- 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/1822036 Title: Add devicetree overlay to support the SLB9670 TPM module for RPi Status in linux-raspi2 package in Ubuntu: New Bug description: [Impact] * Currently it is not possible to use the SLB9670 TPM module with Ubuntu Core since we do not ship the required devicetree overlay to enable it https://github.com/raspberrypi/linux/commit/c28ac2dc08bd73963f953a757a3362c64b5524ed and there is no way for snaps to easily add their own devicetree overlay. Finally it is not practical to expect Ubuntu Core users to have to build and maintain their own kernels just to support a particular hardware device. For background discussion, refer to this thread on the snapcraft forums - https://forum.snapcraft.io/t/guidance-on-snap-interface-to- load-a-device-tree-overlay-on-rpi-core18/10106/11 * Once this overlay is added, then users simply need to modify the boot config.txt to enable the overlay to be loaded automatically. In the future, snapd might also enable support so this can be managed by snapd via snap system configuration. [Test Case] * Boot a RPi with a SLB9670 connected, modify /boot/config.txt to specify dtoverlay=tpm-slb9670, then load the tpm_tis_spi module and /dev/tpm0 should the be available. [Regression Potential] * Almost zero chance of regression potential since this is simply adding a new overlay to the kernel. This is not loaded automatically so there is no real chance of regression. [Other Info] * All that is required for this SRU is to merge https://github.com/raspberrypi/linux/commit/c28ac2dc08bd73963f953a757a3362c64b5524ed to the current bionic raspi kernel branch. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-raspi2/+bug/1822036/+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
