Add the ARM target

src/ch2_01_linux_installation.md

@@ -44,6 +44,11 @@ sudo pacman -S openocd
 
 Go to [https://rustup.rs/](https://rustup.rs/) and follow the instructions.
 
+then add the required ARM target:
+
+```
+rustup target add thumbv7em-none-eabihf
+```
 
 ## Cargo tools
 ```

src/ch2_02_windows_installation.md

@@ -50,6 +50,12 @@ The ordinary C: drive will be found under /mnt/c
 
 Go to [https://rustup.rs/](https://rustup.rs/) and follow the instructions, run the command inside WSL.
 
+then add the required ARM target:
+
+```
+rustup target add thumbv7em-none-eabihf
+```
+
 ##### Cargo tools
 ```
 cargo install cargo-binutils