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bochs [2006/06/26 10:23]
stockholm created, using info from the old wiki
bochs [2006/08/31 05:15]
stockholm Changing CVS commands to comply with new CVS hostnames at sf.net
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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:​@cvs.sourceforge.net:/​cvsroot/​bochs login 
-     cvs -d:​pserver:​anonymous:​@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 netmask {  
-       range dynamic-bootp; ​ 
-     } </​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:,​ Server: 
-     ​Loading​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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