We were using a frequency of 624 which froze my device and in the past
other units too. Set it back to 552 as before so this doesn't happen
anymore
This is being upstreamed, https://gitlab.com/pine64-org/u-boot/-/merge_requests/3
(cherry picked from commit 88b48dee152686a887809ddb296cfd96e0c89f55)
This adds a package that builds u-boot from the pine64/u-boot repository
which includes patches for enableing less hardware while booting so
there's quicker feedback that the power button has been pressed.
It also has a seperate patch file that modifies the clockspeed for the
memory which is one of the main performance bottlenecks of the A64 SoC.
It's a patch file so it's quick and easy to test out other clock speeds
when building. 600Mhz is stable but it should be able to run up to
624Mhz.
