I am looking for an eval/development whatsoever board with at least 8 ARM64 cores and most important JTAG access to program it bare-metal.
And best would be it is not too expensive (< 1000USD).
Any hint appreciated.
Take a look at Samsung's ARTIK 710. It's even cheaper than HiKey960 and seems to have all you need.
Thanks, got my HiKey960, but documentation is sparse. I'll look atr ARTIK710 as well.