Hello, today I've stumbled upon exactly the same issue, running Debian
testing.
The config.txt was replaced with:
kernel=auto
initramfs
I had to manually fix it to:
kernel=vmlinuz-6.4.0-1-arm64
initramfs initrd.img-6.4.0-1-arm64
Please take a look into this issue, as I consider it a severe problem
for everyone.
In my case, I just did apt dist-upgrade and apt autoremove --purge. New
kernel (6.4.0-1 in my case) caused old one to be considered for
autoremoval, after which rpi was rendered in unbootable state. I had to
fix it manually editing config.txt. Executing update-initramfs -u
manually once the system booted after manual fix rendered correct
config.txt, so it has something to do with removal procedure that at the
same time does not regenerate initramfs (since there is no need to do so
since we only remove old kernel and related files).
Regards,
Archi
