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WCH's CH32V407 Brings Vector: A 200MHz RISC-V microcontroller with vector extensions, 8MB of optional PSRAM, and a $2.40 price tag. Here is what the CH32V407 can actually do.
Rev B boards arrived from PCBWay, build quality clean, but a fresh chip held itself in reset on first power-on. The shared nRST / OPN2 pin needs a one-time bootstrap before the USER option byte can be flashed. Patched in-rev with a solder bridge; Rev B is validated.
Minimal Rust bootloader for CH32 MCUs. v0.4.0 adds CH32V00x support, stabilizes the API and wire protocol, and fits in 1920 bytes of system flash.