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Failed to login SUN machine through the serial port

Publication Date:  2012-07-25 Views:  59 Downloads:  0
Issue Description
Failed to login SUN machine through the serial port, there is no any prompt displaying and can't input any command.
Alarm Information
Null
Handling Process
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:
output-device=screen/ttya/ttyb
input-device=keyboard/ttya/ttyb
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
Root Cause
The following analysises are base on V240 and V440
There are 3 input/output methods (sequence as the priority):
1.Keyboard
2.Screen (Monitor)
3.Serial port
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.
Suggestions

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