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Garbled Characters Are Displayed When the Client Accesses SOL Through the iMana

Publication Date:  2015-06-24 Views:  445 Downloads:  0

Issue Description

Hardware configuration:
RH2288 V2


1.  On the basic input/output system (BIOS) screen, set the serial port baud rate to 38400, as shown in Figure 1.

Figure 1 Serial port baud rate

2.  On the client, run the following command to connect to the iMana and activate Serial Over LAN (SOL) by using the IPMItool:

ipmitool -I lanplus -H iManaIP -U root -P root sol activate (iManaIP indicates the iMana IP address, -U root indicates the iMana user name, and -P root indicates the password of iMana user root.)

3.  Garbled characters are displayed during system startup, as shown in Figure 2.

Figure 2 Garbled characters

Handling Process

Press Delete during the power on self-test (POST) of the server to enter the BIOS screen, and set the serial port baud rate to 115200 (choose Advanced > Console Redirection Setup > Baud Rate), as shown in Figure 3. Then press F10 to save and exit.

Figure 3 Setting the serial port baud rate

Root Cause

  1. The BIOS sends data to the serial port during startup. After the BIOS starts up, the service system also sends data to the serial port.
  2. If the baud rate sent by the BIOS to the serial port is inconsistent with that sent by the service system (the service system sends the baud rate that has a fixed value of 115200), the iMana will differentiate between the baud rates.
  3. Differentiating between baud rates is implemented by sampling, which takes certain time.
  4. The baud rate is not 115200 during BIOS startup, and the iMana will receive data at the baud rate sent by the BIOS for a period of time after the BIOS starts up. The iMana receives data at a baud rate different from that of the service system. Therefore, garbled characters are displayed.


Check whether the serial port baud rate of the BIOS is 115200 (default) first. If no, set it to 115200.