mirror of
https://github.com/xcat2/xNBA.git
synced 2024-12-15 07:41:45 +00:00
122 lines
3.9 KiB
Plaintext
122 lines
3.9 KiB
Plaintext
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.
|