Segfault with GCC in Armbian [Solved].
To continue this story of over and under clocking memory for stability.  Here is a graph showing the relative memory bandwidth of the Rock64  with different memory clock speeds.

[Image: rock64_400.svg]

Again both of the Rock64 single-board computers I have seem stable with the memory clock set to 400 MHz. Since the errors at 786 MHz are intermittent, my guess is the memory could still go a little faster, perhaps 600 MHz or even 666 MHz.

Does anyone know how to make uboot files which initialize the memory at 600 or 666 MHz?
I don't. But I do thank you ejolson for delving into this issue some of us have. Our boards should have been replaced free imo but this thread may offer us hope in getting ours /mine to compile pkgs properly. Some care about other uses like a smooth desktop, games, video and this would help them too. I'll test whatever you get done just leave us instruction steps please.
i have just successfully created my own custom ddr.bin with 666mhz mem freq following the idea from here:

by simply changing the freq values in the ddr.bin with a hex editor - in my case i used it for a rk3328 tv box,
but i think it will work the same way for the rock64 too ... here are my notes about it:

good luck and best wishes - hexdump

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