Update description of the build process

README.md

@@ -1,27 +1,40 @@
 # Prusa-Firmware-MMU-Private
 
 ## How to prepare build env and tools
-Use tools from the Buddy FW and a separate Atmel AVR GCC 5.4.
+As the first step extract the AVR-GCC to some dir, e.g. `/home/user/AVRToolchainMMU/avr8-gnu-toolchain-5.4.0`
 
-Extract the AVR-GCC to some dir, e.g. `/home/user/AVRToolchainMMU/avr8-gnu-toolchain-5.4.0`
+Add `/home/user/AVRToolchainMMU/avr8-gnu-toolchain-5.4.0/bin` to your `PATH`.
 
 ```
 mkdir .dependencies
 cd .dependencies
-ln -s ../../STM32Toolchain/clang-format-9.0.0-noext
-ln -s ../../STM32Toolchain/cmake-3.15.5
-ln -s ../../STM32Toolchain/ninja-1.9.0
-ln -s ../../AVRToolchainMMU/avr8-gnu-toolchain-5.4.0
+mkdir gcc-avr-5.4.0
+cd ..
+utils/bootstrap.py
 ```
 
-## How to build the preliminary project so far:
-Please make sure you have your `cmake`, `clang-format` and `ninja` in path
+`bootstrap.py` will now download all the "missing" dependencies into the `.dependencies` folder:
+- clang-format-9.0.0-noext
+- cmake-3.15.5
+- ninja-1.9.0
 
+Note: bootstrap.py will not try to download the AVR-GCC as there is already a directory called
+`gcc-avr-5.4.0`. This will be fixed when we find out where to download the correct packages reliably.
+
+## How to build the preliminary project so far:
+Now the process is the same as in the Buddy Firmware:
+```
+utils/build.py
+```
+
+builds the firmware.hex in build/mmu_release
+
+In case you'd like to build the project directly via cmake you can use an approach like this:
 ```
 mkdir build
 cd build
-cmake .. -G Ninja -DCMAKE_TOOLCHAIN_FILE=../../cmake/AnyAvrGcc.cmake
+cmake .. -G Ninja -DCMAKE_TOOLCHAIN_FILE=../cmake/AnyAvrGcc.cmake
 ninja
 ```
 
-Should produce a firmware.hex file
+Should produce a firmware.hex file as well.