Failed to login SUN machine through the serial port, there is no any prompt displaying and can't input any command.
Please refer to the following to change the eeprom output-device=ttya, then reboot the Sun Server.
Which serial port is in use? It is decided in OpenBootPROM:
The default input and output are Screen+keyboard, ttya means serial port A, ttyb means serial port B
In Solaris, use command "eeprom" or "eeprom | grep put" to check or change current input and output devices (the configuration will take effect after reboot)
# eeprom output-device=ttya
In OK mode, use command “printenv” to check, use command “setenv” to change the configuration (the configuration will take effect after reboot)
ok setenv output-device ttya
The following analysises are base on V240 and V440
There are 3 input/output methods (sequence as the priority):
The system can only recognize one input/output, the high priority input/output method can get the connection with the system.
For further details please refer to the attachment.