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===== Running Etherboot within Bochs =====
Orginal documentation by Michael Brown mbrown@fensystems.co.uk 
Based on an idea suggested by H. Peter Anvin hpa@zytor.com 
Wikified By Tim Fletcher tim@parrswood.manchester.sch.uk 
Reformatted by Anselm M. Hoffmeister

==== What is Bochs? ====
Bochs is a program that simulates a complete Intel x86 computer, including hardware. It can be used to test Etherboot. There is a special pseudo NIC ("pnic") implemented in Bochs, with a corresponding driver in Etherboot. (There is also an NE2000 ISA driver in Bochs, but it doesn't seem to quite work.)

==== Getting Bochs running ====
  * Get the bochs source code:<file>     cvs -d:pserver:anonymous:@bochs.cvs.sourceforge.net:/cvsroot/bochs login
     cvs -d:pserver:anonymous:@bochs.cvs.sourceforge.net:/cvsroot/bochs co bochs</file>
  * Configure bochs with<file>./configure --enable-all-optimisations --enable-pci --enable-ne2000 --enable-pnic </file>
  * Other potentially useful configure options:
    * <file>--prefix=/usr</file>to force use of standard file locations 
    * <file>--enable-debugger</file>to enable the internal debugger 
  * Build bochs: <file>make </file>
  * Configure Etherboot with ''CONFIG_PCI_DIRECT'': add the line <file>CFLAGS += -DCONFIG_PCI_DIRECT </file>to the end of ''src/arch/i386/Config''.
  * Build ''bin/pnic.zrom'': <file>make bin/pnic.zrom </file>
  * Load the TUN/TAP kernel module: <file>modprobe tun </file>
  * You should see the device ''/dev/net/tun'' is created automatically if you're using devfs, otherwise you may have to create it by hand with: <file>mknod /dev/net/tun c 10 200 </file>
  * Grant yourself write access to /dev/net/tun: <file>su -c 'chown <your user id> /dev/net/tun' </file>
  * The alternative to this is to run Bochs as root. Don't do that. 
  * Add the following fragment to ''/etc/dhcpd.conf'': <file>subnet 10.254.254.0 netmask 255.255.255.252 { 
       range dynamic-bootp 10.254.254.1 10.254.254.1; 
     } </file>You will also need to add in any of your usual declarations for Etherboot, e.g. <file>filename "vmlinuz.ltsp";</file>. Note that this setup assumes that your DHCP server, TFTP server etc. all live on the machine you are using for running Bochs. If not, then you're on your own. 
  * Change back to this directory and run bochs from your Bochs source tree:<file>cd /path/to/Etherboot/contrib/bochs 
     /path/to/bochs/source/tree/bochs </file>
  * Select option 5 (Begin simulation). You will be prompted for your root password. This is required in order to configure the tun1 network interface and to restart the DHCP server. 
  * You should see Bochs start up and attempt to boot from the network, with a screen that looks like this:<file>VGA BIOS - Version 2.40
     Copyright (C) 1990-2000 Elpin Systems, Inc.
     All rights reserved.
     
     Licensed for use with bochs, courtesy of MandrakeSoft.
     
     For information on this or other VGA development products, contact
     Elpin Systems at: (800) 723-9038 or www.elpin.com
     
     Bochs BIOS, 1 cpu, $Revision: 1.9 $ $Date: 2004/03/10 14:04:59 $
     
     
     Etherboot 5.3.6 (GPL) http://etherboot.org Tagged ELF for [PNIC]
     
     Relocating _text from: [00091020,0009fb50) to [01ef14d0,01f00000)
     Boot from (N)etwork or (Q)uit?
     
     Probing pci nic...
     [pnic] - Detected Bochs Pseudo NIC MAC FE:FD:00:00:00:01 (API v1.0) at 0xdc00
     Searching for server (DHCP)...
     ..Me: 10.254.254.1, Server: 10.254.254.2
     Loading 10.254.254.2:/tftpboot/kernel</file>

==== Serial console ====
You can use the program ''serial-console'' to obtain a virtual serial console for Etherboot running within Bochs. Simply run <file>./serial-console</file> on a spare tty (e.g. a separate ''xterm window'') before starting Bochs, and ensure that you have compiled Etherboot with appropriate settings such as 
<file>  CFLAGS+=      -DCONSOLE_DUAL -DCOMCONSOLE=0x3F8 -DCONSPEED=9600</file>

There is a manual page for ''serial-console''; use <file>man ./serial-console.1</file> to view it. 
==== TODO ====
  * Packet forwarding/masquerading - document what must be set up. 
  * Mention possibility of using RFB as the display device - in conjunction with the serial console, gives you a test facility that can be accessed remotely. 
  * Mention use of BOCHSBP instruction (xchgw bx) to avoid need to calculate breakpoints. 
==== Further information ====
... about [[vmwarebios|Etherboot as extension ROM for Bochs]] is available.
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