I am writing this with the hope that I can get some help. Particularly I have noticed conversations between swampdog and thagrol and I think they might have the answer. (I would reply to those threads instead of creating a new one but they are locked, so accept my apologies - don't mean to create duplication)
I have set up my RPi 4 with the booting from microsd (holding only the /boot partition) and a raid1 array for the /root partition. The steps I have used have all been documented on https://github.com/robertalexa/rpi-raid ... /README.md (please bear in mind that thos instructions are something i put together from multiple threads and are not designed as a how to guide for others, just a reference for future me to go back to, so don't burn me if there is something wrong.)
The problem I have is that after a kernel update the system will not boot anymore.
I know that would be because I need to regenerate the bootloader image, but I have tried that and the system will still not boot. (without doing this the system failed to find md0 array, and after doing this I do not get this error anymore, instead the display cuts off, and the rpi just sits there - no hdmi output)
So after kernel update, before rebooting, i did
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sudo update-initramfs -c -k new-version
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I would truly appreciate some guidance here.
Thank you in advance!
LE: I have realised that I should mention the OS (doh). 2021-05-07-raspios-buster-arm64 is the image I am starting with (5.10.17-v8+). After kernel update i end up with 5.10.60-v8+. This is now in my rebuild/testing setup, after already trashing a fully configured home server big oof