Introduction To Xmodem - HP A6604 Installation Manual

Table 6-5 BootWare operation sub-menu
<1> Backup Full BootWare
<2> Restore Full BootWare
<3> Update BootWare By Serial
<4> Update BootWare By Ethernet
<0> Exit To Main Menu
Device Control Sub-menu
Select 9 on the main menu to enter the device control sub-menu:
==========================<DEVICE CONTROL>============================
|<1> Display All Available Nonvolatile Storage Device(s)
|<2> Set The Operating Device
|<3> Set The Default Boot Device
|<0> Exit To Main Menu
======================================================================
Enter your choice(0-3):
Items on this sub-menu are described in the following table:
Table 6-6 Device control sub-menu
<1> Display All Available Nonvolatile Storage Device(s)
<2> Set The Operating Device
<3> Set The Default Boot Device
<0> Exit To Main Menu
Updating Applications and BootWare Through a Serial
Interface

Introduction to Xmodem

Use Xmodem when updating an application and BootWare through a serial interface.
Xmodem is a file transfer protocol that is widely used due to its simplicity and high performance.
Xmodem transfers files through a serial interface. It supports two types of data packets (128
bytes and 1 KB), two check methods (checksum and CRC), and error packet retransmission
mechanism (generally the maximum number of retransmission attempts is 10).
The Xmodem transmission procedure is completed by the cooperation of a receiving program
and a sending program. The receiving program sends a negotiation character to negotiate a
packet check 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 an acknowledgement character and the

sending program proceeds to send another packet.
If the check fails, the receiving program sends a negative acknowledgement character and then

the sending program retransmits the packet.
Menu item
Menu item
Description
Back up the entire BootWare.
Restore the entire BootWare.
Update BootWare through a serial interface.
Update BootWare through Ethernet.
Return to the main menu.
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Description
Display all available storage device(s).
Configure the operating device.
Configure the default boot device.
Return to the main menu.