470 CHAPTER 41: BOOT ROM AND HOST SOFTWARE LOADING
Copyright (c) 2004-2007 3Com Corporation
Creation date : Apr 17 2007, 10:12:36
CPU Clock Speed : 200MHz
BUS Clock Speed : 33MHz
Memory Size : 64MB
Mac Address : 000fe2123456
Press Ctrl-B to enter Boot Menu...
Press <Ctrl+B>. The system displays:
Password :
n
To enter the BOOT menu, you should press <Ctrl+B> within five seconds (full
startup mode) or one second (fast startup mode) after the information "Press
Ctrl-B to enter BOOT Menu..." displays. Otherwise, the system starts to extract the
program; and if you want to enter the BOOT Menu at this time, you will have to
restart the switch.
Enter the correct Boot ROM password (no password is set by default). The system
enters the BOOT Menu:
BOOT MENU
1. Download application file to flash
2. Select application file to boot
3. Display all files in flash
4. Delete file from flash
5. Modify bootrom password
6. Enter bootrom upgrade menu
7. Skip current configuration file
8. Set bootrom password recovery
9. Set switch startup mode
0. Reboot
Enter your choice(0-9):
Loading by XModem
through Console Port
Introduction to XModem
XModem protocol is a file transfer protocol that is widely used due to its simplicity
and high stability. The XModem protocol transfers files through Console port. It
supports two types of data packets (128 bytes and 1 KB), two check methods
(checksum and CRC), and multiple attempts of error packet retransmission
(generally the maximum number of retransmission attempts is ten).
The XModem transmission procedure is completed by a receiving program and a
sending program. The receiving program sends negotiation characters to
negotiate a packet checking method. After the negotiation, the sending program
starts to transmit data packets. When receiving a complete packet, the receiving
program checks the packet using the agreed method. If the check succeeds, the
receiving program sends acknowledgement characters and the sending program
proceeds to send another packet. If the check fails, the receiving program sends
negative acknowledgement characters and the sending program retransmits the
packet.
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