** Also affects: linux-raspi2 (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: linux-raspi2 (Ubuntu Bionic)
Importance: Undecided => Medium
** Changed in: linux-raspi2 (Ubuntu Bionic)
Status: New => Confirmed
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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
Status in linux-raspi2 source package in Bionic:
Confirmed
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.
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