README.md

Miscellaneous scripts for LF/FlexPRET.

Toolchain

Make sure you have spike and riscv64-unknown-elf-gcc on your PATH.

You can get the toolchains below:

https://static.dev.sifive.com/dev-tools/riscv64-unknown-elf-gcc-8.3.0-2019.08.0-x86_64-linux-ubuntu14.tar.gz https://github.com/edwardcwang/riscv-toolchains/releases/download/toolchains/riscv64-unknown-elf-gcc-8.3.0-2019.08.0-x86_64-linux-ubuntu14.tar.gz

https://www.sifive.com/boards

Bare-metal LF with GDB Workflow

1. Write the LF program
2. Generate C code using lfc -n <prog>.lf
3. Swap out <lf_prog_dir>/src-gen/core with lib/core_spike_gdb
4. Also copy lib/start.S into src-gen
5. Compile src-gen/<prog>.c using scripts/compile.sh
6. Start 3 different screen/tmux windows
7. In window 1, cd <lf_prog_dir>/src-gen and use spike.sh to launch the RISC-V binary <prog_bin>
8. In window 2, cd gdb/ and do openocd -f spike.cfg
9. In window 3 (and subsequent actions will happen in this window), cd <lf_prog_dir>/src-gen and use riscv32-unknown-elf-gdb <prog_bin>
10. After gdb prompt shows up, type in target remote localhost:3333
11. Then, change the source dir to the project directory in gdb using dir <lf_prog_dir> (e.g. $(gdb) dir ../../timer). This is used to prevent certain "file not found" errors in gdb
12. There will be a spin wait at the beginning. Disable it to continue program execution by doing print wait = 0
13. Now feel free to use all of your favorite gdb commands to debug the program!