Porting FreeRTOS to WCH CH32V307, It seems WCH has some serious issue about their RISC-V MCUs...
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The processor itself implements an RV32IMAFCUX ISA, called RISC-V4A. However, someone at WCH decided it needs to be compatible with their Cortex-M chips, so they did a few things to make this processor more "ARM-ish".
