Public bug reported:
When using Ubuntu on a Raspberry Pi Compute Module 4 Rev 1.0, the DTB
for Model 4B is chosen. This is incorrect, as the CM4 has a dedicated
DTB file to be used instead (slightly different hardware).
The incorrect section in 'all.db' is this one:
Machine: Raspberry Pi 4 Model B
Machine: Raspberry Pi 4 Model B Rev 1.1
Machine: Raspberry Pi 4 Model B Rev 1.2
Machine: Raspberry Pi 4 Model B Rev 1.4
Machine: Raspberry Pi Compute Module 4 Rev 1.0
Machine: Raspberry Pi 400 Rev 1.0
Machine: Raspberry Pi *
Kernel-Flavors: raspi
Method: pi
DTB-Id: bcm2711-rpi-4-b.dtb
U-Boot-Script-Name: bootscr.rpi
Required-Packages: u-boot-tools
which assigns the 4B DTB also to the CM4. The correct DTB assignment for
the CM4 would be:
DTB-Id: bcm2711-rpi-cm4.dtb
So, I successfully fixed this issue locally by adding the following
section at the start of the 'all.db' file:
Machine: Raspberry Pi Compute Module 4 Rev 1.0
Kernel-Flavors: raspi
Method: pi
DTB-Id: bcm2711-rpi-cm4.dtb
U-Boot-Script-Name: bootscr.rpi
Required-Packages: u-boot-tools
and removing the line
Machine: Raspberry Pi Compute Module 4 Rev 1.0
from the original section.
This works nicely, but I am not sure about any implications for other
systems. Could someone please have a look into this.
Side note: The catch-all line
Machine: Raspberry Pi *
might make it harder to use strict alphabetic ordering of the Machine
entries, as the CM4 entry must be inserted *before* the catch-all line
in order to be effective.
Thank you for your consideration.
** Affects: flash-kernel (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1928314
Title:
Wrong DTB chosen for Raspberry Pi Compute Module 4 (all.db)
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