Porting FreeRTOS to WCH CH32V307, It seems WCH has some serious issue about their RISC-V MCUs...

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The first thing I noticed is, instead of implementing a MTIME counter or CLINT, they put a so-called “SysTick” peripheral, but forgot to wire the counter rergisters to CSRs.

The SysTick peripheral is register-level compatible with the same peripheral used in Cortex-M, extended to 64 bit counter and compare register. and here are the register table:

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