[doc] Document New Toolchain Configuration
Signed-off-by: Sam Elliott <selliott@lowrisc.org>
diff --git a/doc/ug/install_instructions/index.md b/doc/ug/install_instructions/index.md
index c062c62..6f36295 100644
--- a/doc/ug/install_instructions/index.md
+++ b/doc/ug/install_instructions/index.md
@@ -101,7 +101,35 @@
$ make
```
-The `make` command installs the toolchain to `/tools/riscv`, no additional `make install` step is needed.
+ The `make` command installs the toolchain to `/tools/riscv`, no additional `make install` step is needed.
+
+3. Write a [meson toolchain configuration file](https://mesonbuild.com/Cross-compilation.html#defining-the-environment) for your toolchain.
+ It should look like the following (though your paths may be different):
+ ```ini
+ [binaries]
+ c = '/tools/riscv/bin/riscv32-unknown-elf-gcc'
+ cpp = '/tools/riscv/bin/riscv32-unknown-elf-g++'
+ ar = '/tools/riscv/bin/riscv32-unknown-elf-ar'
+ ld = '/tools/riscv/bin/riscv32-unknown-elf-ld'
+ objdump = '/tools/riscv/bin/riscv32-unknown-elf-objdump'
+ objcopy = '/tools/riscv/bin/riscv32-unknown-elf-objcopy'
+ strip = '/tools/riscv/bin/riscv32-unknown-elf-strip'
+
+ [properties]
+ needs_exe_wrapper = true
+ has_function_printf = false
+ c_args = ['-march=rv32imc', '-mabi=ilp32', '-mcmodel=medany']
+ cpp_args = ['-march=rv32imc', '-mabi=ilp32', '-mcmodel=medany']
+
+ [host_machine]
+ system = 'bare metal'
+ cpu_family = 'riscv32'
+ cpu = 'ibex'
+ endian = 'little'
+ ```
+
+ You will need to pass the path to this file to `./meson_init.sh` using the `-t FILE` option.
+
### OpenOCD
