I don't understand. Does the system work initially but then stops working after
an update?
If so, can you post the output of 'dpkg -l' from before the update and after
the update?
** Also affects: linux-raspi (Ubuntu Focal)
Importance: Undecided
Status: New
** Changed in: linux-raspi (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1992671
Title:
cm4 2021 version failed to boot on 20.04
Status in linux-raspi package in Ubuntu:
Incomplete
Status in linux-raspi source package in Focal:
New
Bug description:
The new CM4 (2021), which has UKCA sign on the board, here is its cpuinfo :
Hardware : BCM2835
Revision : b03141
Model : Raspberry Pi Compute Module 4 Rev 1.1
Once it is connected to internet, the security patch creates in /boot
lrwxrwxrwx 1 root root 43 Oct 12 14:31 dtb-5.4.0-1071-raspi ->
dtbs/5.4.0-1071-raspi/./bcm2711-rpi-4-b.dtb
At the same time, in /boot/firmware, all .elf files and .dat files are
backed up and replaced. The new files make the next boot crash. If we
connect it to screen, it shows that the cm4 needs new software to
boot.
The fix from our side is to mount as usb disk and replace all .elf and .dat
files by the latest here :
https://github.com/raspberrypi/firmware/tree/master/boot
and then it can boot again.
On CM4 (2020) this security patch doesn't crash on boot.
Revision : b03140
Model : Raspberry Pi Compute Module 4 Rev 1.0
Here is the product change note :
https://pip.raspberrypi.com/categories/645
This bug seems to be introduced before, the 1070 patch cause the same
boot problem already.
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