Revised Building.md and improved Building-Dart-SDK-for-ARM-or-RISC-V.md

Closes #60225

GitOrigin-RevId: bdd56f7
Change-Id: Ib28c88264519f45f821ac3571386520ba5b24000
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/412900
Commit-Queue: Slava Egorov <[email protected]>
Reviewed-by: Slava Egorov <[email protected]>

Author: moluopro

docs/Building-Dart-SDK-for-ARM-or-RISC-V.md

@@ -66,10 +66,10 @@ $ ./tools/linux_dist_support/create_debian_packages.py -a {ia32, x64, arm, arm64
 
 # Testing
 
-In addition to cross-compiling the Dart SDK, test items can also be cross-compiled. Even without the corresponding hardware, you can quickly verify if the source code modifications you made are correct. Below is a simple method for development on the riscv64 platform for your reference.
+In addition to cross-compiling the Dart SDK, test items can also be cross-compiled. Even without the corresponding hardware, you can quickly verify if the source code modifications you made are correct. Below is a simple method for development on the RISCV64 platform for your reference.
 
-Cross-compile the test items on x86_64 Linux to riscv64 and perform correctness check:
-1. Follow the steps above to cross-compile the riscv64 sdk.
+Cross-compile the test items on X64 Linux to RISCV64 and perform correctness check:
+1. Follow the steps above to cross-compile the RISCV64 sdk.
 2. Cross-compile the test items by running: `./tools/build.py --mode release --arch riscv64 most run_ffi_unit_tests`.
 3. Install the necessary QEMU dependencies: `sudo apt install qemu-user qemu-user-static qemu-system`.
 4. Run the test items, e.g., `tests/lib`:
@@ -85,4 +85,10 @@ export QEMU_LD_PREFIX=/usr/riscv64-linux-gnu
   --time \
   --tasks 8 \
   lib
-```
+```
+
+If you have configured QEMU for RISCV64, you can merge steps 3 and 4 into a single command (omitting some print parameters):
+
+```bash
+./tools/test.py -r vm -m release -a riscv64 --use-qemu lib
+```

docs/Building.md

@@ -219,7 +219,7 @@ Dart2JS example:
   language
 ```
 
-In the above examples: `--progress` is used to style the progress bar in terminal; `--time` is used to print time information; `--tasks` is used to set the number of parallel tasks; you can use `. /tools/test.py --help` for more details.
+In the above examples: `--progress` is used to style the progress bar in terminal; `--time` is used to print time information; `--tasks` is used to set the number of parallel tasks; you can use `./tools/test.py --help` for more details.
 
 ## Troubleshooting and tips for browser tests
 To debug a browser test failure, you must start a local http server to serve the test.  This is made easy with a helper script in dart/tools/testing.  The error report from test.py gives the command line to start the server in a message that reads: