The ROM code supports booting from a USB interface with the following characteristics:
- Using the USB1 subsystem in USB2.0 mode
- Device integrated USB transceiver ( USB2PHY1)
- Enumeration default time-out is 3 seconds (time-out USB)
- The boot message default time-out is 3 seconds (time-out boot message).
Note: The ROM code does not handle any OTG-specific features.