Always use the --recursive flag to clone and initialize no-OS submodules too.

git clone --recursive https://github.com/analogdevicesinc/no-OS

• Build guide:
  • NO-OS Build Guide
• Post build steps
  • Xilinx
• STM32 related:
  • Migrate STM32 project to different target
• no-OS contributions:
  • Coding style guidelines for no-os development