FAQs.md

System on Cat FAQs

Which version of RISC-V toolchain to use?

Here are the version signatures of the tools we use for development and testing:

https://github.com/riscv/riscv-gnu-toolchain

`master` branch @168ef95ba72b

riscv-binutils @ 8db5daf
riscv-dejagnu @ 2e99dc0
riscv-gcc @ 3c148a7
riscv-gdb @ 635c14e
riscv-glibc @ 2f626de
riscv-newlib @ 320b28e
riscv-qemu @ ff36f2f

Those tools support RISC-V user-level ISA v2.2 and privileged architecture v1.10. Note that problems might emerge if the version of RISC-V your tools support differs from those aforementioned. A typical error of this kind when you try building Meownitor:

riscv32-unknown-elf-gcc -c -march=rv32i -DWITH_CSR -DWITH_INTERRUPT -DWITH_IRQ -DWITH_ECALL -fno-builtin -o entry.o entry.S
riscv32-unknown-elf-gcc -c -march=rv32i -DWITH_CSR -DWITH_INTERRUPT -DWITH_IRQ -DWITH_ECALL -fno-builtin -o monitor.o monitor.c
monitor.c: Assembler messages:
monitor.c:168: Error: Instruction csrr requires absolute expression
monitor.c:178: Error: Instruction csrr requires absolute expression
monitor.c:183: Error: Instruction csrr requires absolute expression
Makefile:26: recipe for target 'monitor.o' failed
make: *** [monitor.o] Error 1

It seems that some tests failed.

Please check the version of your verilator. It is recommended by chisel3 to use verilator of 3.922 or later. You may find the latest verilator here: http://git.veripool.org/git/verilator

It is prompted that ./prog/firmware/mastercat.bin is missing when I try sbt run.

Please enter prog/firmware and run make first. Make sure that mastercat.bin is present in that directory when you run sbt run.