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Add "Known Issues" section to README

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Donald Sebastian Leung 2020-08-21 16:58:33 +08:00
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README.md
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@ -33,6 +33,10 @@ This should run in the order of a few minutes.
Support for the RV32I base ISA and RV32M extension are planned and well underway. Support for other ISAs in the original riscv-formal such as RV32C and their 64-bit counterparts may also be added in the future as time permits.
## Known Issues
As of 21/08/2020, the verification passes unconditionally, even when obvious, deliberate bugs are introduced to the Minerva core and/or its components thereof (such as replacing subtraction with addition in the adder). This is caused by the Minerva core having its `rvfi.valid` signal de-asserted all of the time. The cause of this issue is very likely due to the absence of proper interrupt signals and instruction + data buses, which must be connected to the core for it to function properly. Perhaps the issue could be solved by constructing abstract instruction + data buses with suitable assumed properties and connecting those abstract interfaces to the Minerva core (but then, what would those properties be?).
## License
See [LICENSE](./LICENSE)