HP COMPAQ EVO T30, COMPAQ EVO T20 User Manual
September 2002
Prepared By
PSG Marketing
Compaq Computer
Corporation
W
HITE
APER
P
PXE Operation Flow
for Compaq Evo Thin Clients
C
ONTENTS
Introduction ....................3
List of Terms......................... 3
Current PXE
Support Products............ 4
PXE Operation
Flow: Corrupt
Firmware Scenario .......... 5
Replacing Corrupt
FLASH Image Using
NetXfer ............................7
PXE Operation
Flow: Good
Firmware Scenario ........ 11
This paper explains how a Compaq Evo Thin Client communicates with the server in a
PXE environment and offers solutions for replacing corrupted firmware.
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Notice
© 2002 Compaq Information Technologies Group, L.P.
Compaq, the Compaq logo, and Evo are trademarks of Compaq Information Technologies
Group, L.P. in the U.S. and/or other countries. Microsoft and Windows are trademarks of
Microsoft Corporation in the U.S. and/or other countries.
All other product names mentioned herein may be trademarks of their respective companies.
Compaq shall not be liable for technical or editorial errors or omissions contained herein. The
information is provided “as is” without warranty of any kind and is subject to change without
notice. The warranties for Compaq products are set forth in the express limited warranty
statements accompanying such products. Nothing herein should be construed as constituting an
additional warranty.
PXE Operation Flow for Compaq Evo Thin Clients
North America First Edition (September 2002)
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NTRODUCTION
I
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PXE (Pre-boot Execution Environment) is supported on both the Compaq Evo T20 and T30
NTe PXE and XPe products. Intel’s PXE is a protocol that defines interaction between TCP/IP,
DHCP and TFTP to enable a client to download a pre-boot environment from a server. Before the
operating system is started a PXE enabled client broadcasts a DHCPDISCOVER request with an
extension tag that identifies it as a PXE request. A DHCP server or DHCP proxy listening for PXE
requests then sends the client a list of boot servers. The client uses TFTP to download an ITF
Agent, which in turn downloads a complete binary image to the terminal.
For additional information about PXE please see the
Specification
white paper. This paper is available for download at the following URL:
Preboot Execution Environment (PXE)
www.intel.com/labs/manage/wfm/wfmspecs.htm
List of Terms
The following is a list of acronyms used in this paper:
Table 1. List of Terms
Acronym Definition
BIOS Basic Input Output System
BOOTP Bootstrap Protocol
DHCP Dynamic Host Config uration Protocol
Img2Dev Image to Device (Agent)
IP Internet Protocol
ITF Internal Transport Function (Agent)
POST Power On Self Test
PXE Preboot eXecution Environment
TCP Transmission Control Protocol
TFTP Trivial File Transfer Protocol
WOL Wake On LAN
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URRENT
C
Table 2. Current PXE Support Products
Model Part Number Config Code O/S Description
T30 238618-xxx JS24 NTe T30 64F/64R NTe PXE w/o Browser
T20 290804-xxx JS3K NTe T20 64F/64R NTe PXE w/o Browser
T30 305254-xxx JS3M NTe T30 128F/128R NTe PXE with
T20 305253-xxx JS3L NTe T20 128F/128R NTe PXE with
T20 XPe 308791-xxx JS3N XPe T20 300M XPe with PXE 192/256
T30 XPe 308792-xxx JS3Q XPe T30 300M XPe with PXE 192/256
T30 XPe 311335-xxx JS3S XPe T30 300M XPe with PXE 256/256
T20 XPe 311334-xxx JS3R XPe T20 300M XPe with PXE 256/256
: PXE is not supported on CE 2.12 or CE.NET products or on previous NTe products.
NOTE
PXE S
UPPORT PRODUCTS
Browser
Browser
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