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

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Another interesting thing is, they also put these peripherals like SysTick and PFIC(their own NVIC implementation, we'll cover that later) at 0xE000_0000, which is PPB(Private Peripheral Bus) on Cortex-M processors.

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