build: Add infrastructure for the bootloader program and libcommon.
-rw-r--r-- 30 .gitignore
-rw-r--r-- 1 README
-rw-r--r-- 402 SConscript.libcommon
-rw-r--r-- 1408 SConscript.target
-rw-r--r-- 1153 SConstruct
drwxr-xr-x - src
-rw-r--r-- 427 thumbv6m-none-eabi.json