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122 lines
3.9 KiB
Plaintext
122 lines
3.9 KiB
Plaintext
Running Etherboot within Bochs
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==============================
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Michael Brown <mbrown@fensystems.co.uk>
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Based on an idea suggested by H. Peter Anvin <hpa@zytor.com>.
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$Id$
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Bochs is a program that simulates a complete Intel x86 computer,
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including hardware. It can be used to test Etherboot. There is a
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special pseudo NIC ("pnic") implemented in Bochs, with a corresponding
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driver in Etherboot. (There is also an NE2000 ISA driver in Bochs,
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but it doesn't seem to quite work.)
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To get bochs running is fairly simple:
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1. Get the bochs source code:
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a) cvs -d:pserver:anonymous:@cvs.sourceforge.net:/cvsroot/bochs login
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b) cvs -d:pserver:anonymous:@cvs.sourceforge.net:/cvsroot/bochs co bochs
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2. Configure bochs with
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./configure --enable-all-optimisations --enable-pci \
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--enable-ne2000 --enable-pnic
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Other potentially useful configure options:
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--prefix=/usr
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to force use of standard file locations
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--enable-debugger
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to enable the internal debugger
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3. Build bochs:
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make
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4. Configure Etherboot with CONFIG_PCI_DIRECT: add the line
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CFLAGS += -DCONFIG_PCI_DIRECT
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to the end of src/arch/i386/Config.
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5. Build bin/pnic.zrom:
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make bin/pnic.zrom
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6. Load the TUN/TAP kernel module:
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modprobe tun
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You should see the device /dev/net/tun is created automatically if
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you're using devfs, otherwise you may have to create it by hand with:
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mknod /dev/net/tun c 10 200
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7. Grant yourself write access to /dev/net/tun:
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su -c 'chown <your user id> /dev/net/tun'
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The alternative to this is to run Bochs as root. Don't do that.
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8. Add the following fragment to /etc/dhcpd.conf:
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subnet 10.254.254.0 netmask 255.255.255.252 {
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range dynamic-bootp 10.254.254.1 10.254.254.1;
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}
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You will also need to add in any of your usual declarations for
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Etherboot, e.g. 'filename "vmlinuz.ltsp";'. Note that this setup
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assumes that your DHCP server, TFTP server etc. all live on the
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machine you are using for running Bochs. If not, then you're on
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your own.
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9. Change back to this directory and run bochs from your Bochs source tree:
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cd /path/to/Etherboot/contrib/bochs
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/path/to/bochs/source/tree/bochs
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10. Select option 5 (Begin simulation). You will be prompted for your
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root password. This is required in order to configure the tun1
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network interface and to restart the DHCP server.
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11. You should see Bochs start up and attempt to boot from the network,
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with a screen that looks like:
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VGA BIOS - Version 2.40
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Copyright (C) 1990-2000 Elpin Systems, Inc.
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All rights reserved.
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Licensed for use with bochs, courtesy of MandrakeSoft.
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For information on this or other VGA development products, contact
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Elpin Systems at: (800) 723-9038 or www.elpin.com
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Bochs BIOS, 1 cpu, $Revision$ $Date$
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Etherboot 5.3.6 (GPL) http://etherboot.org Tagged ELF for [PNIC]
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Relocating _text from: [00091020,0009fb50) to [01ef14d0,01f00000)
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Boot from (N)etwork or (Q)uit?
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Probing pci nic...
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[pnic] - Detected Bochs Pseudo NIC MAC FE:FD:00:00:00:01 (API v1.0) at 0xdc00
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Searching for server (DHCP)...
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..Me: 10.254.254.1, Server: 10.254.254.2
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Loading 10.254.254.2:/tftpboot/kernel
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Serial console
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==============
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You can use the program "serial-console" to obtain a virtual serial
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console for Etherboot running within Bochs. Simply run
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"./serial-console" on a spare tty (e.g. a separate xterm window)
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before starting Bochs, and ensure that you have compiled Etherboot
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with appropriate settings such as
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CFLAGS+= -DCONSOLE_DUAL -DCOMCONSOLE=0x3F8 -DCONSPEED=9600
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There is a manual page for "serial-console"; use
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"man ./serial-console.1" to view it.
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TODO
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====
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Packet forwarding/masquerading - document what must be set up.
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Mention possibility of using RFB as the display device - in
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conjunction with the serial console, gives you a test facility that
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can be accessed remotely.
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Mention use of BOCHSBP instruction (xchgw %bx,%bx) to avoid need to
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calculate breakpoints.
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