During boot, the system sends messages to /var/adm/messages if the system fails to locate or successfully load a kernel terminal emulator compatible frame buffer driver. To monitor these messages, type the following command in a separate window:
% tail -f /var/adm/messages
To avoid problems with USB while debugging the driver, change the EEPROM input-device NVRAM configuration parameter to use a serial port instead of the keyboard. See the eeprom(1M) man page for more information about this parameter.