**
**                                                                           
**  VIA Rhine Family Fast Ethernet Adapter
**                                                                           
**  PXE BOOTROM
**                                                                           
**  v2.43  Dec , 2005
**
**

Introduction:
=============

  PXE is short for the Preboot Execution Environment. This PXE bootrom is built by 
  PXE SDK 2.0 build 082, so it full supports PXE Specification 2.1.


Contents of the Subdirectory:
=============================

    PXE.TXT             This file.
    PXEM.LOM            The bootrom binary file with bootstrap menu for Lan On Motherboard.
    PXEM.NIC            The bootrom binary file with bootstrap menu for Network Interface Card.
    PXEB.LOM            The bootrom binary file without bootstrap menu and supporting BEV/PNP 
                        only for Lan On Motherboard.
    PXEB.NIC            The bootrom binary file without bootstrap menu and supporting BEV/PNP 
                        only for Network Interface Card.

Installation:
=============

  Before starting the installation process, make sure that the adapter
  is properly installed and configured. You can use the diagnostic program
  (A:\DIAG.EXE) to make sure your connection with the network is correct.

  PXE EEPROM Options
  -------------------
  After POST of BIOS, BootROM will waiting a short time to change boot method.
  If user strike <Shift-Tab> key, PXE will show some advenced menu and you
  have 2 options in it:

    Boot Protocol
    Boot Option

  And if no <Shift-Tab> key, PXE will boot according EERPOM value. please
    refer EEPROM.doc to get more informatin about their configuration.

  1. Boot Protocol
    You cannot change boot protocol.

  2. Boot Option
    There are 4 options:
        Network First, Then Local
        Local First, Then Network
        Local Only
        According BIOS

    A. Network First, Then Local

       This option is chosen to boot network by hooking INT 19. Since INT 19
    is booting vector, our device is always chosen to boot regardless of IPL 
    priority.

    B. Local First, Then Network

       This option is chosen to boot from network by hooking INT 18h. Since
    INT 18h is boot recovery vector, so only after other local devices with 
    higher IPL prioirty failed to boot successfully then we may boot.
    
    C. Local Only

        This option is chosen to boot from local devices, not to boot from 
    network.

    D. According BIOS

       This option is chosen to boot network by PnP/BEV. Whether to boot or not
    according IPL priority. The proiority for IPL devices is configurable by the 
    user by editing the IPL Priority in BIOS Setup.


  If user enter any option and press <F4> to save, PXE will write back into EEPROM.
  Pressing <ESC> will ignore any modification and booting according EEPROM setting.
  
  When you use PXEB.LOM and PXEB.NIC:

      This is for network boot by using PnP/BEV (BBS). Whether to boot or not 
      according IPL priority. The proiority for IPL devices is configurable by
      the user by editing the IPL Priority in BIOS setup.