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Update src/doc/rustc/src/platform-support/riscv64a23-unknown-linux-gnu.md

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Co-authored-by: zachs18 <8355914+zachs18@users.noreply.github.com>
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@ -2,10 +2,9 @@
**Tier: 3**
RISC-V targets using the ratified [RVA23 Profile](https://github.com/riscv/riscv-profiles/blob/main/rva23-profile.adoc).
RISC-V target using the ratified [RVA23 Profile](https://github.com/riscv/riscv-profiles/blob/main/src/rva23-profile.adoc).
This target will enable all mandary features of rva23u64 and rva23s64 by default.
## Target maintainers
[@ZhongyaoChen](https://github.com/ZhongyaoChen)
@ -18,13 +17,11 @@ This target requires:
* Linux Kernel version 4.20 or later
* glibc 2.17 or later
## Building the target
The target is distributed through `rustup`, and otherwise require no
special configuration.
Tier-3 target is not distributed through `rustup`.
If you need to build your own Rust for some reason though, the target can be build with:
You need to build your own Rust, the target can be build with:
```bash
./x build --target riscv64a23-unknown-linux-gnu
@ -32,35 +29,14 @@ If you need to build your own Rust for some reason though, the target can be bui
## Building Rust programs
Add the target:
Add the toolchain:
```bash
rustup target add riscv64a23-unknown-linux-gnu
rustup toolchain link rva23-toolchain {path-to-rust}/build/host/stage2
```
Then cross compile crates with:
```bash
cargo build --target riscv64a23-unknown-linux-gnu
```
## Cross-compilation toolchains and Testing
On Ubuntu 24.04, we can install compilation dependencies with:
```bash
apt install -y git python3 g++ g++-riscv64-linux-gnu
```
Then build target with:
```bash
./x build --target=riscv64a23-unknown-linux-gnu
```
There are no special requirements for testing and running the targets.
For testing cross-builds on the host, you can use the docker image. It will automatically set up a RISC-V QEMU emulator and run all the test suite.
```bash
DEPLOY=1 ./src/ci/docker/run.sh riscv64a23-gnu
RUSTFLAGS="-C linker=riscv64-linux-gnu-gcc" cargo +rva23-toolchain build --target=riscv64a23-unknown-linux-gnu
```