I tend to suspect it's unrelated, but if you add "nomodeset nofb" to > your boot command line it will turn off the graphics drivers. >
Yes, I guess it is indeed unrelated. With buster I can see the same messages during boot: - *ERROR* Failed to load firmware! on drm - pcc_cpufreq_init: Too many CPUs, dynamic performance scaling disabled But no crash happens, Buster boots correctly (every time) and I can use the system. I currently suspect a Kernel bug in 5.10. I might be dead wrong, but that's my current guess.

