2005-05-17 16:44:57 +00:00
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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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2006-04-26 00:40:27 +00:00
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cvs -d:pserver:anonymous@cvs.sourceforge.net:/cvsroot/bochs login
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cvs -d:pserver:anonymous@cvs.sourceforge.net:/cvsroot/bochs co bochs
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2005-05-17 16:44:57 +00:00
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2. Configure bochs with
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2006-04-26 00:40:27 +00:00
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pushd bochs
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./configure --enable-all-optimisations --enable-pci --enable-pnic
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--enable-debugger --enable-magic-breakpoints --enable-disasm
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popd
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2005-05-17 16:44:57 +00:00
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3. Build bochs:
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2006-04-26 00:40:27 +00:00
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make -C bochs
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2005-05-17 16:44:57 +00:00
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2006-04-26 00:40:27 +00:00
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4. Set up a TAP virtual network device:
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2005-05-17 16:44:57 +00:00
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modprobe tun
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2006-04-26 00:40:27 +00:00
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tunctl -u <username> -t tap0
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ifconfig tap0 up 10.254.254.2 netmask 255.255.255.0
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2005-05-17 16:44:57 +00:00
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2006-04-26 00:40:27 +00:00
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5. Add the following fragment to /etc/dhcpd.conf:
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2005-05-17 16:44:57 +00:00
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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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2006-04-26 00:40:27 +00:00
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6. Restart dhcpd
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/etc/init.d/dhcpd restart
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2005-05-17 16:44:57 +00:00
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2006-04-26 00:40:27 +00:00
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7. Build Etherboot images
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pushd ../../src
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make bin/pnic.dsk
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popd
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2005-05-17 16:44:57 +00:00
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2006-04-26 00:40:27 +00:00
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8. Start Bochs
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./bochs/bochs -q
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You should get to the debugger prompt "<bochs:1>". Type "c" to
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start running Bochs.
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2005-05-17 16:44:57 +00:00
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2006-04-26 00:40:27 +00:00
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You should see Bochs start up, load up Etherboot and attempt to boot
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from the network.
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2005-05-17 16:44:57 +00:00
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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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2006-04-26 00:40:27 +00:00
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CFLAGS+= -DCONSOLE_DUAL -DCOMCONSOLE=0x3F8 -DCONSPEED=9600
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2005-05-17 16:44:57 +00:00
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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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