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diff --git a/contrib/bochs/README b/contrib/bochs/README new file mode 100644 index 00000000..80e1529e --- /dev/null +++ b/contrib/bochs/README @@ -0,0 +1,121 @@ +Running Etherboot within Bochs +============================== + +Michael Brown <mbrown@fensystems.co.uk> +Based on an idea suggested by H. Peter Anvin <hpa@zytor.com>. + +$Id$ + +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.) + +To get bochs running is fairly simple: + +1. Get the bochs source code: + a) cvs -d:pserver:anonymous:@cvs.sourceforge.net:/cvsroot/bochs login + b) cvs -d:pserver:anonymous:@cvs.sourceforge.net:/cvsroot/bochs co bochs + +2. Configure bochs with + ./configure --enable-all-optimisations --enable-pci \ + --enable-ne2000 --enable-pnic + Other potentially useful configure options: + --prefix=/usr + to force use of standard file locations + --enable-debugger + to enable the internal debugger + +3. Build bochs: + make + +4. Configure Etherboot with CONFIG_PCI_DIRECT: add the line + CFLAGS += -DCONFIG_PCI_DIRECT + to the end of src/arch/i386/Config. + +5. Build bin/pnic.zrom: + make bin/pnic.zrom + +6. Load the TUN/TAP kernel module: + modprobe tun + 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: + mknod /dev/net/tun c 10 200 + +7. Grant yourself write access to /dev/net/tun: + su -c 'chown <your user id> /dev/net/tun' + The alternative to this is to run Bochs as root. Don't do that. + +8. Add the following fragment to /etc/dhcpd.conf: + subnet 10.254.254.0 netmask 255.255.255.252 { + range dynamic-bootp 10.254.254.1 10.254.254.1; + } + You will also need to add in any of your usual declarations for + Etherboot, e.g. 'filename "vmlinuz.ltsp";'. 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. + +9. Change back to this directory and run bochs from your Bochs source tree: + cd /path/to/Etherboot/contrib/bochs + /path/to/bochs/source/tree/bochs + +10. 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. + +11. You should see Bochs start up and attempt to boot from the network, + with a screen that looks like: + +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, $Revision$ $Date$ + + +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 + + + + +Serial console +============== + +You can use the program "serial-console" to obtain a virtual serial +console for Etherboot running within Bochs. Simply run +"./serial-console" 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 + CFLAGS+= -DCONSOLE_DUAL -DCOMCONSOLE=0x3F8 -DCONSPEED=9600 + +There is a manual page for "serial-console"; use +"man ./serial-console.1" 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,%bx) to avoid need to +calculate breakpoints. |