I know risc-v 32bits and 64bits instructions are very similar... but it is not the same in the end: I prefer to write 64bits risc-v code paths once and for all.

I know risc-v 32bits and 64bits instructions are very similar... but it is not the same in the end: I prefer to write 64bits risc-v code paths once and for all. I have already a few GD32VFG10[12] boards, but the MCU is 32bits, I avoid them. BTW, the bouffalo has a 32bits risc-v MCU, the 64bits risc-v is only a "guest" processor. And of course, initing a complex SOC can be a nightmare if really badly done, it all depends on the SOC, but the code is usally around. But do you know of a mini-board with plenty of available GPIOs (~30), a USB-C port and a USB device block, RV64 ofc. The only one seems to be the mango pi with the D1.