1.5. User Interface

U-Boot uses a simple command line interface (CLI), usually over a serial console port.

Two different command interpreters are available:

• simple CLI
• Bourne compatible shell (HUSH shell from Busybox)

Configuration parameters and commands / command sequences (scripts !) can be stored in "environment variables" which can be saved to non-volatile storage (flash, EEPROM, NVRAM, etc.)