clean up

firmware/Readme.md

@@ -10,18 +10,21 @@ Below is the guide to set up the build environment, compile, and flash the CH32V
 
 ## 1. Install toolchain
 
-Download xPack RISC-V GCC:
+### 1.1. Download xPack RISC-V GCC:
 [https://github.com/xpack-dev-tools/riscv-none-elf-gcc-xpack/releases](https://github.com/xpack-dev-tools/riscv-none-elf-gcc-xpack/releases)
 
+Choose `linux-x64` for X86-64 or `linux-arm64` for ARM64.
+
 Extract it:
 ```bash
+cd ~/Downloads
 mkdir -p ~/toolchains
-tar -xzf xpack-riscv-none-elf-gcc-*-linux-x64.tar.gz -C ~/toolchains
+tar -xzf xpack-riscv-none-elf-gcc-15.2.0-1-linux-x64.tar.gz -C ~/toolchains # Update e.g.: to your version
 ```
 
 Activate it (add this to your ~/.bashrc for permanence):
 ```Bash
-export TOOLCHAIN=$HOME/toolchains/xpack-riscv-none-elf-gcc-* # Update e.g.: xpack-riscv-none-elf-gcc-15.2.0-1
+export TOOLCHAIN=$HOME/toolchains/xpack-riscv-none-elf-gcc-15.2.0-1 # Update e.g.: to your version
 export PATH=$TOOLCHAIN/bin:$PATH
 ```
 
@@ -30,9 +33,24 @@ Verify the installation:
 riscv-none-elf-gcc --version
 ```
 
+It should print:
+```Bash
+riscv-none-elf-gcc (xPack GNU RISC-V Embedded GCC x86_64) 15.2.0
+Copyright (C) 2025 Free Software Foundation, Inc.
+This is free software; see the source for copying conditions.  There is NO
+warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+```
+
+### 1.2. Install dependencies
+```bash
+sudo apt update
+sudo apt install libusb-1.0-0-dev libudev-dev
+```
+
 ## 2. Install Flashing Tool (minichlink)
 Clone the ch32fun repository and build minichlink:
 ```Bash
+cd ~/
 git clone https://github.com/cnlohr/ch32fun ~/ch32fun
 cd ~/ch32fun/minichlink
 make