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Knowledge Base

Failed to login SUN machine through the serial port

Publication Date:  2019-07-04  |   Views:  274  |   Downloads:  0  |   Author:  Zhou Jun  |   Document ID:  EKB0000345356

Contents

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

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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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