Clarify use of ENABLE_PCPI

YosysHQ / picorv32

PicoRV32 - A Size-Optimized RISC-V CPU

ISC License

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Clarify use of ENABLE_PCPI #252

Closed WillGreen closed 6 months ago

WillGreen commented 6 months ago

I misunderstood the README and set ENABLE_PCPI=1 when using an internal PCPI core. When built with Yosys, this caused the internal core to fail. This change clarifies that you should only use ENABLE_PCPI=1 for external cores.

ENABLE_PCPI is only needed for external co-processors.
Correct spelling of demonstration.