03-19-2020, 06:31 AM
(03-19-2020, 03:54 AM)hunderteins Wrote: I guess this is also the reason, why the mainline-kernel runs painfully slow when booting with the old u-boot from ayufan.
The old u-boot from Ayufan set up the "little" Cortex-A53 CPU cores to run at a normal speed but left the "big" Cortex-A72 cores running at only 12MHz (!). During boot, the mainline kernel cpufreq driver does set the big cores to a sensible speed, but this happens quite late in the boot process, after a lot of the previous boot process has run on the very slow "big" CPU cores (because in theory they are meant to be more powerful). That's what makes it slow. The mainline U-Boot initialises all cores to 600MHz (as far as I remember) which makes boot reasonably fast.
