lnBMP : CH32V3xx support

 It is painful, but it is beginning to work :


On the picture a RP2040-pico zero running lnBMP and happily debugging a ch32v307 Riscv chip

(of course it can still debug Arm chips)


Perigoso did a lot of work there, only the communication protocol /implementation was missing.

It is still a bit slow though :(



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