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added instructions to utilize riscv64-unknown-elf-gdb #10

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16 changes: 14 additions & 2 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,8 @@ $ rustup target add riscv32imac-unknown-none-elf
```

- [RISC-V toolchain for SiFive boards](https://static.dev.sifive.com/dev-tools/riscv64-unknown-elf-gcc-8.1.0-2019.01.0-x86_64-linux-ubuntu14.tar.gz)
* Extract this package.
* See "Set up `gdb`", below.

- Programmer software
* HiFive1 Rev B: [Segger JLink software & documentation pack for Linux](https://www.segger.com/downloads/jlink/)
Expand All @@ -45,7 +47,17 @@ $ cd app
2. If you have an old HiFive1 board, edit `Cargo.toml`:
replace `board-hifive1-revb` with `board-hifive1`.

3. Run the programmer software.
3. Set up `gdb`:
* Open `.cargo/config`
* Edit the line that reads `runner = "riscv32imac-unknown-elf-gdb -q -x gdb_init"` to read:
```
runner = "/path/to/riscv64-unknown-elf-gcc-8.1.0-2019.01.0-x86_64-linux-ubuntu14/bin/riscv64-unknown-elf-gdb -q -x gdb_init"
```
or ensure that `riscv64-unknown-elf-gdb` is on your `$PATH`.
(`riscv64-unknown-elf-gdb` was downloaded and extracted in the `RISC-V toolchain for SiFive
boards` step, above.)

4. Run the programmer software.
* HiFive1 Rev B:
```sh
/path/to/JLinkGDBServer -device FE310 -if JTAG -speed 4000 -port 3333
Expand All @@ -55,7 +67,7 @@ replace `board-hifive1-revb` with `board-hifive1`.
/path/to/openocd -f board/sifive-hifive1.cfg
```

4. Build the template application or one of the examples.
5. Build the template application or one of the examples.

``` console
$ cargo build
Expand Down