I've finally managed to build a properly working (and fully open source) firmware for the ROCKPro64. The firmware consists of two files, which can be downloaded from:
https://sibelius.home.xs4all.nl/firmware/rk3399-rockpro64/idbloader.img https://sibelius.home.xs4all.nl/firmware/rk3399-rockpro64/u-boot.itb In order to use this firmware you'll have to write it to a uSD card or an eMMC module with the following commands: # dd if=idbloader.img of=/dev/sdXc seek=64 # dd if=u-boot.itb of=/dev/sdXc seek=16384 Note that if you flashed a firmware to the onboard SPI flash, you'll have to erase it first or disable the SPI flash with a jumper wire connecting pins 23 and 25. Also note that the firmware overlaps with the msdos partition in the default OpenBSD/arm64 disk layout. Therefore you can't have the firmware and the OpenBSD boot/root filesystems on the same device without running through additional hoops. Ultimately the goal is to make it possible to put this firmware in SPI flash, but I haven't looked into that yet. This firmware uses a more standard serial speed of 115200, which means you can use almost any USB TTL serial cable. DVFS is supported so you can use sysctl hw.setperf to control to clock speed of the CPUs. But be aware that without a fan the board will probably overheat if you run it at the highest supported clock speed. At some point this should land in the official u-boot-aarch64 packages. But since this build relies on a fairly large patch set that hasn't landed upstream yet, this may take some time. Cheers, Mark
