xv6

dot-bochsrc (33514B)

---

 # You may now use double quotes around pathnames, in case
 # your pathname includes spaces.
 
 #=======================================================================
 # CONFIG_INTERFACE
 #
 # The configuration interface is a series of menus or dialog boxes that
 # allows you to change all the settings that control Bochs's behavior.
 # There are two choices of configuration interface: a text mode version
 # called "textconfig" and a graphical version called "wx".  The text
 # mode version uses stdin/stdout and is always compiled in.  The graphical
 # version is only available when you use "--with-wx" on the configure 
 # command.  If you do not write a config_interface line, Bochs will 
 # choose a default for you.
 #
 # NOTE: if you use the "wx" configuration interface, you must also use
 # the "wx" display library.
 #=======================================================================
 #config_interface: textconfig
 #config_interface: wx
 
 #=======================================================================
 # DISPLAY_LIBRARY
 #
 # The display library is the code that displays the Bochs VGA screen.  Bochs 
 # has a selection of about 10 different display library implementations for 
 # different platforms.  If you run configure with multiple --with-* options, 
 # the display_library command lets you choose which one you want to run with.
 # If you do not write a display_library line, Bochs will choose a default for
 # you.
 #
 # The choices are: 
 #   x              use X windows interface, cross platform
 #   win32          use native win32 libraries
 #   carbon         use Carbon library (for MacOS X)
 #   beos           use native BeOS libraries
 #   macintosh      use MacOS pre-10
 #   amigaos        use native AmigaOS libraries
 #   sdl            use SDL library, cross platform
 #   svga           use SVGALIB library for Linux, allows graphics without X11
 #   term           text only, uses curses/ncurses library, cross platform
 #   rfb            provides an interface to AT&T's VNC viewer, cross platform
 #   wx             use wxWidgets library, cross platform
 #   nogui          no display at all
 #
 # NOTE: if you use the "wx" configuration interface, you must also use
 # the "wx" display library.
 #
 # Specific options:
 # Some display libraries now support specific option to control their
 # behaviour. See the examples below for currently supported options.
 #=======================================================================
 #display_library: amigaos
 #display_library: beos
 #display_library: carbon
 #display_library: macintosh
 #display_library: nogui
 #display_library: rfb, options="timeout=60" # time to wait for client
 #display_library: sdl, options="fullscreen" # startup in fullscreen mode
 #display_library: term
 #display_library: win32, options="legacyF12" # use F12 to toggle mouse
 #display_library: wx
 #display_library: x
 
 #=======================================================================
 # ROMIMAGE:
 # The ROM BIOS controls what the PC does when it first powers on.
 # Normally, you can use a precompiled BIOS in the source or binary
 # distribution called BIOS-bochs-latest. The ROM BIOS is usually loaded
 # starting at address 0xf0000, and it is exactly 64k long.
 # You can also use the environment variable $BXSHARE to specify the
 # location of the BIOS.
 # The usage of external large BIOS images (up to 512k) at memory top is
 # now supported, but we still recommend to use the BIOS distributed with
 # Bochs. Now the start address can be calculated from image size.
 #=======================================================================
 romimage: file=$BXSHARE/BIOS-bochs-latest
 #romimage: file=mybios.bin, address=0xfff80000 # 512k at memory top
 #romimage: file=mybios.bin # calculate start address from image size
 
 #=======================================================================
 # CPU:
 # This defines cpu-related parameters inside Bochs:
 #
 #  COUNT:
 #  Set the number of processors when Bochs is compiled for SMP emulation.
 #  Bochs currently supports up to 8 processors. If Bochs is compiled
 #  without SMP support, it won't accept values different from 1.
 #
 #  IPS:
 #  Emulated Instructions Per Second.  This is the number of IPS that bochs
 #  is capable of running on your machine. You can recompile Bochs with
 #  --enable-show-ips option enabled, to find your workstation's capability.
 #  Measured IPS value will then be logged into your log file or status bar
 #  (if supported by the gui).
 #
 #  IPS is used to calibrate many time-dependent events within the bochs 
 #  simulation.  For example, changing IPS affects the frequency of VGA
 #  updates, the duration of time before a key starts to autorepeat, and
 #  the measurement of BogoMips and other benchmarks.
 #
 #  Examples:
 #  Machine                                         Mips
 # ________________________________________________________________
 #  2.1Ghz Athlon XP with Linux 2.6/g++ 3.4         12 to 15 Mips
 #  1.6Ghz Intel P4 with Win2000/g++ 3.3             5 to  7 Mips
 #  650Mhz Athlon K-7 with Linux 2.4.4/egcs-2.91.66  2 to  2.5 Mips
 #  400Mhz Pentium II with Linux 2.0.36/egcs-1.0.3   1 to  1.8 Mips
 #=======================================================================
 cpu: count=2, ips=10000000
 
 #=======================================================================
 # MEGS
 # Set the number of Megabytes of physical memory you want to emulate. 
 # The default is 32MB, most OS's won't need more than that.
 # The maximum amount of memory supported is 2048Mb.
 #=======================================================================
 #megs: 256
 #megs: 128
 #megs: 64
 megs: 32
 #megs: 16
 #megs: 8
 
 #=======================================================================
 # OPTROMIMAGE[1-4]:
 # You may now load up to 4 optional ROM images. Be sure to use a 
 # read-only area, typically between C8000 and EFFFF. These optional
 # ROM images should not overwrite the rombios (located at
 # F0000-FFFFF) and the videobios (located at C0000-C7FFF).
 # Those ROM images will be initialized by the bios if they contain 
 # the right signature (0x55AA) and a valid checksum.
 # It can also be a convenient way to upload some arbitrary code/data
 # in the simulation, that can be retrieved by the boot loader
 #=======================================================================
 #optromimage1: file=optionalrom.bin, address=0xd0000
 #optromimage2: file=optionalrom.bin, address=0xd1000
 #optromimage3: file=optionalrom.bin, address=0xd2000
 #optromimage4: file=optionalrom.bin, address=0xd3000
 
 #optramimage1: file=/path/file1.img, address=0x0010000
 #optramimage2: file=/path/file2.img, address=0x0020000
 #optramimage3: file=/path/file3.img, address=0x0030000
 #optramimage4: file=/path/file4.img, address=0x0040000
 
 #=======================================================================
 # VGAROMIMAGE
 # You now need to load a VGA ROM BIOS into C0000.
 #=======================================================================
 #vgaromimage: file=bios/VGABIOS-elpin-2.40
 vgaromimage: file=$BXSHARE/VGABIOS-lgpl-latest
 #vgaromimage: file=bios/VGABIOS-lgpl-latest-cirrus
 
 #=======================================================================
 # VGA:
 # Here you can specify the display extension to be used. With the value
 # 'none' you can use standard VGA with no extension. Other supported
 # values are 'vbe' for Bochs VBE and 'cirrus' for Cirrus SVGA support.
 #=======================================================================
 #vga: extension=cirrus
 #vga: extension=vbe
 vga: extension=none
 
 #=======================================================================
 # FLOPPYA:
 # Point this to pathname of floppy image file or device
 # This should be of a bootable floppy(image/device) if you're
 # booting from 'a' (or 'floppy').
 #
 # You can set the initial status of the media to 'ejected' or 'inserted'.
 #   floppya: 2_88=path, status=ejected             (2.88M 3.5" floppy)
 #   floppya: 1_44=path, status=inserted            (1.44M 3.5" floppy)
 #   floppya: 1_2=path, status=ejected              (1.2M  5.25" floppy)
 #   floppya: 720k=path, status=inserted            (720K  3.5" floppy)
 #   floppya: 360k=path, status=inserted            (360K  5.25" floppy)
 #   floppya: 320k=path, status=inserted            (320K  5.25" floppy)
 #   floppya: 180k=path, status=inserted            (180K  5.25" floppy)
 #   floppya: 160k=path, status=inserted            (160K  5.25" floppy)
 #   floppya: image=path, status=inserted           (guess type from image size)
 #
 # The path should be the name of a disk image file.  On Unix, you can use a raw
 # device name such as /dev/fd0 on Linux.  On win32 platforms, use drive letters
 # such as a: or b: as the path.  The parameter 'image' works with image files
 # only. In that case the size must match one of the supported types.
 #=======================================================================
 floppya: 1_44=/dev/fd0, status=inserted
 #floppya: image=../1.44, status=inserted
 #floppya: 1_44=/dev/fd0H1440, status=inserted
 #floppya: 1_2=../1_2, status=inserted
 #floppya: 1_44=a:, status=inserted
 #floppya: 1_44=a.img, status=inserted
 #floppya: 1_44=/dev/rfd0a, status=inserted
 
 #=======================================================================
 # FLOPPYB:
 # See FLOPPYA above for syntax
 #=======================================================================
 #floppyb: 1_44=b:, status=inserted
 floppyb: 1_44=b.img, status=inserted
 
 #=======================================================================
 # ATA0, ATA1, ATA2, ATA3
 # ATA controller for hard disks and cdroms
 #
 # ata[0-3]: enabled=[0|1], ioaddr1=addr, ioaddr2=addr, irq=number
 # 
 # These options enables up to 4 ata channels. For each channel
 # the two base io addresses and the irq must be specified.
 # 
 # ata0 and ata1 are enabled by default with the values shown below
 #
 # Examples:
 #   ata0: enabled=1, ioaddr1=0x1f0, ioaddr2=0x3f0, irq=14
 #   ata1: enabled=1, ioaddr1=0x170, ioaddr2=0x370, irq=15
 #   ata2: enabled=1, ioaddr1=0x1e8, ioaddr2=0x3e0, irq=11
 #   ata3: enabled=1, ioaddr1=0x168, ioaddr2=0x360, irq=9
 #=======================================================================
 ata0: enabled=1, ioaddr1=0x1f0, ioaddr2=0x3f0, irq=14
 ata1: enabled=1, ioaddr1=0x170, ioaddr2=0x370, irq=15
 ata2: enabled=0, ioaddr1=0x1e8, ioaddr2=0x3e0, irq=11
 ata3: enabled=0, ioaddr1=0x168, ioaddr2=0x360, irq=9
 
 #=======================================================================
 # ATA[0-3]-MASTER, ATA[0-3]-SLAVE
 #
 # This defines the type and characteristics of all attached ata devices:
 #   type=       type of attached device [disk|cdrom] 
 #   mode=       only valid for disks [flat|concat|external|dll|sparse|vmware3]
 #   mode=       only valid for disks [undoable|growing|volatile]
 #   path=       path of the image
 #   cylinders=  only valid for disks
 #   heads=      only valid for disks
 #   spt=        only valid for disks
 #   status=     only valid for cdroms [inserted|ejected]
 #   biosdetect= type of biosdetection [none|auto], only for disks on ata0 [cmos]
 #   translation=type of translation of the bios, only for disks [none|lba|large|rechs|auto]
 #   model=      string returned by identify device command
 #   journal=    optional filename of the redolog for undoable and volatile disks
 #   
 # Point this at a hard disk image file, cdrom iso file, or physical cdrom
 # device.  To create a hard disk image, try running bximage.  It will help you
 # choose the size and then suggest a line that works with it.
 #
 # In UNIX it may be possible to use a raw device as a Bochs hard disk, 
 # but WE DON'T RECOMMEND IT.  In Windows there is no easy way.
 #
 # In windows, the drive letter + colon notation should be used for cdroms.
 # Depending on versions of windows and drivers, you may only be able to 
 # access the "first" cdrom in the system.  On MacOSX, use path="drive"
 # to access the physical drive.
 #
 # The path is always mandatory. For flat hard disk images created with
 # bximage geometry autodetection can be used (cylinders=0 -> cylinders are
 # calculated using heads=16 and spt=63). For other hard disk images and modes
 # the cylinders, heads, and spt are mandatory.
 #
 # Default values are:
 #   mode=flat, biosdetect=auto, translation=auto, model="Generic 1234"
 #
 # The biosdetect option has currently no effect on the bios
 #
 # Examples:
 #   ata0-master: type=disk, mode=flat, path=10M.sample, cylinders=306, heads=4, spt=17
 #   ata0-slave:  type=disk, mode=flat, path=20M.sample, cylinders=615, heads=4, spt=17
 #   ata1-master: type=disk, mode=flat, path=30M.sample, cylinders=615, heads=6, spt=17
 #   ata1-slave:  type=disk, mode=flat, path=46M.sample, cylinders=940, heads=6, spt=17
 #   ata2-master: type=disk, mode=flat, path=62M.sample, cylinders=940, heads=8, spt=17
 #   ata2-slave:  type=disk, mode=flat, path=112M.sample, cylinders=900, heads=15, spt=17
 #   ata3-master: type=disk, mode=flat, path=483M.sample, cylinders=1024, heads=15, spt=63
 #   ata3-slave:  type=cdrom, path=iso.sample, status=inserted
 #=======================================================================
 ata0-master: type=disk, mode=flat, path="xv6.img", cylinders=100, heads=10, spt=10
 ata0-slave: type=disk, mode=flat, path="fs.img", cylinders=1024, heads=1, spt=1
 #ata0-slave: type=cdrom, path=D:, status=inserted
 #ata0-slave: type=cdrom, path=/dev/cdrom, status=inserted
 #ata0-slave: type=cdrom, path="drive", status=inserted
 #ata0-slave: type=cdrom, path=/dev/rcd0d, status=inserted 
 
 #=======================================================================
 # BOOT:
 # This defines the boot sequence. Now you can specify up to 3 boot drives.
 # You can either boot from 'floppy', 'disk' or 'cdrom'
 # legacy 'a' and 'c' are also supported
 # Examples:
 #   boot: floppy
 #   boot: disk
 #   boot: cdrom
 #   boot: c
 #   boot: a
 #   boot: cdrom, floppy, disk
 #=======================================================================
 #boot: floppy
 boot: disk
 
 #=======================================================================
 # CLOCK:
 # This defines the parameters of the clock inside Bochs:
 #
 #  SYNC:
 #  TO BE COMPLETED (see Greg explanation in feature request #536329)
 #
 #  TIME0:
 #  Specifies the start (boot) time of the virtual machine. Use a time 
 #  value as returned by the time(2) system call. If no time0 value is 
 #  set or if time0 equal to 1 (special case) or if time0 equal 'local', 
 #  the simulation will be started at the current local host time.
 #  If time0 equal to 2 (special case) or if time0 equal 'utc',
 #  the simulation will be started at the current utc time.
 #
 # Syntax:
 #  clock: sync=[none|slowdown|realtime|both], time0=[timeValue|local|utc]
 #
 # Example:
 #   clock: sync=none,     time0=local       # Now (localtime)
 #   clock: sync=slowdown, time0=315529200   # Tue Jan  1 00:00:00 1980
 #   clock: sync=none,     time0=631148400   # Mon Jan  1 00:00:00 1990
 #   clock: sync=realtime, time0=938581955   # Wed Sep 29 07:12:35 1999
 #   clock: sync=realtime, time0=946681200   # Sat Jan  1 00:00:00 2000
 #   clock: sync=none,     time0=1           # Now (localtime)
 #   clock: sync=none,     time0=utc         # Now (utc/gmt)
 # 
 # Default value are sync=none, time0=local
 #=======================================================================
 #clock: sync=none, time0=local
 
 
 #=======================================================================
 # FLOPPY_BOOTSIG_CHECK: disabled=[0|1]
 # Enables or disables the 0xaa55 signature check on boot floppies
 # Defaults to disabled=0
 # Examples:
 #   floppy_bootsig_check: disabled=0
 #   floppy_bootsig_check: disabled=1
 #=======================================================================
 #floppy_bootsig_check: disabled=1
 floppy_bootsig_check: disabled=0
 
 #=======================================================================
 # LOG:
 # Give the path of the log file you'd like Bochs debug and misc. verbiage
 # to be written to. If you don't use this option or set the filename to
 # '-' the output is written to the console. If you really don't want it,
 # make it "/dev/null" (Unix) or "nul" (win32). :^(
 #
 # Examples:
 #   log: ./bochs.out
 #   log: /dev/tty
 #=======================================================================
 #log: /dev/null
 log: bochsout.txt
 
 #=======================================================================
 # LOGPREFIX:
 # This handles the format of the string prepended to each log line.
 # You may use those special tokens :
 #   %t : 11 decimal digits timer tick
 #   %i : 8 hexadecimal digits of cpu current eip (ignored in SMP configuration)
 #   %e : 1 character event type ('i'nfo, 'd'ebug, 'p'anic, 'e'rror)
 #   %d : 5 characters string of the device, between brackets
 # 
 # Default : %t%e%d
 # Examples:
 #   logprefix: %t-%e-@%i-%d
 #   logprefix: %i%e%d
 #=======================================================================
 #logprefix: %t%e%d
 
 #=======================================================================
 # LOG CONTROLS
 #
 # Bochs now has four severity levels for event logging.
 #   panic: cannot proceed.  If you choose to continue after a panic, 
 #          don't be surprised if you get strange behavior or crashes.
 #   error: something went wrong, but it is probably safe to continue the
 #          simulation.
 #   info: interesting or useful messages.
 #   debug: messages useful only when debugging the code.  This may
 #          spit out thousands per second.
 #
 # For events of each level, you can choose to crash, report, or ignore.
 # TODO: allow choice based on the facility: e.g. crash on panics from
 #       everything except the cdrom, and only report those.
 #
 # If you are experiencing many panics, it can be helpful to change
 # the panic action to report instead of fatal.  However, be aware
 # that anything executed after a panic is uncharted territory and can 
 # cause bochs to become unstable.  The panic is a "graceful exit," so
 # if you disable it you may get a spectacular disaster instead.
 #=======================================================================
 panic: action=ask
 error: action=report
 info: action=report
 debug: action=ignore
 #pass: action=fatal
 
 #=======================================================================
 # DEBUGGER_LOG:
 # Give the path of the log file you'd like Bochs to log debugger output.
 # If you really don't want it, make it /dev/null or '-'. :^(
 #
 # Examples:
 #   debugger_log: ./debugger.out
 #=======================================================================
 #debugger_log: /dev/null
 #debugger_log: debugger.out
 debugger_log: -
 
 #=======================================================================
 # COM1, COM2, COM3, COM4:
 # This defines a serial port (UART type 16550A). In the 'term' you can specify
 # a device to use as com1. This can be a real serial line, or a pty.  To use
 # a pty (under X/Unix), create two windows (xterms, usually).  One of them will
 # run bochs, and the other will act as com1. Find out the tty the com1
 # window using the `tty' command, and use that as the `dev' parameter.
 # Then do `sleep 1000000' in the com1 window to keep the shell from
 # messing with things, and run bochs in the other window.  Serial I/O to
 # com1 (port 0x3f8) will all go to the other window.
 # Other serial modes are 'null' (no input/output), 'file' (output to a file
 # specified as the 'dev' parameter), 'raw' (use the real serial port - under
 # construction for win32), 'mouse' (standard serial mouse - requires
 # mouse option setting 'type=serial' or 'type=serial_wheel') and 'socket'
 # (connect a networking socket).
 #
 # Examples:
 #   com1: enabled=1, mode=null
 #   com1: enabled=1, mode=mouse
 #   com2: enabled=1, mode=file, dev=serial.out
 #   com3: enabled=1, mode=raw, dev=com1
 #   com3: enabled=1, mode=socket, dev=localhost:8888
 #=======================================================================
 #com1: enabled=1, mode=term, dev=/dev/ttyp9
 
 
 #=======================================================================
 # PARPORT1, PARPORT2:
 # This defines a parallel (printer) port. When turned on and an output file is
 # defined the emulated printer port sends characters printed by the guest OS
 # into the output file. On some platforms a device filename can be used to
 # send the data to the real parallel port (e.g. "/dev/lp0" on Linux, "lpt1" on
 # win32 platforms).
 #
 # Examples:
 #   parport1: enabled=1, file="parport.out"
 #   parport2: enabled=1, file="/dev/lp0"
 #   parport1: enabled=0
 #=======================================================================
 parport1: enabled=1, file="/dev/stdout"
 
 #=======================================================================
 # SB16:
 # This defines the SB16 sound emulation. It can have several of the
 # following properties.
 # All properties are in the format sb16: property=value
 # midi: The filename is where the midi data is sent. This can be a
 #       device or just a file if you want to record the midi data.
 # midimode:
 #      0=no data
 #      1=output to device (system dependent. midi denotes the device driver)
 #      2=SMF file output, including headers
 #      3=output the midi data stream to the file (no midi headers and no
 #        delta times, just command and data bytes)
 # wave: This is the device/file where wave output is stored
 # wavemode:
 #      0=no data
 #      1=output to device (system dependent. wave denotes the device driver)
 #      2=VOC file output, incl. headers
 #      3=output the raw wave stream to the file
 # log:  The file to write the sb16 emulator messages to.
 # loglevel:
 #      0=no log
 #      1=resource changes, midi program and bank changes
 #      2=severe errors
 #      3=all errors
 #      4=all errors plus all port accesses
 #      5=all errors and port accesses plus a lot of extra info
 # dmatimer:
 #      microseconds per second for a DMA cycle.  Make it smaller to fix
 #      non-continuous sound.  750000 is usually a good value.  This needs a
 #      reasonably correct setting for the IPS parameter of the CPU option.
 #
 # For an example look at the next line:
 #=======================================================================
 
 #sb16: midimode=1, midi=/dev/midi00, wavemode=1, wave=/dev/dsp, loglevel=2, log=sb16.log, dmatimer=600000
 
 #=======================================================================
 # VGA_UPDATE_INTERVAL:
 # Video memory is scanned for updates and screen updated every so many
 # virtual seconds.  The default is 40000, about 25Hz. Keep in mind that
 # you must tweak the 'cpu: ips=N' directive to be as close to the number
 # of emulated instructions-per-second your workstation can do, for this
 # to be accurate.
 #
 # Examples:
 #   vga_update_interval: 250000
 #=======================================================================
 vga_update_interval: 300000
 
 # using for Winstone '98 tests
 #vga_update_interval:  100000
 
 #=======================================================================
 # KEYBOARD_SERIAL_DELAY:
 # Approximate time in microseconds that it takes one character to
 # be transfered from the keyboard to controller over the serial path.
 # Examples:
 #   keyboard_serial_delay: 200
 #=======================================================================
 keyboard_serial_delay: 250
 
 #=======================================================================
 # KEYBOARD_PASTE_DELAY:
 # Approximate time in microseconds between attempts to paste
 # characters to the keyboard controller. This leaves time for the
 # guest os to deal with the flow of characters.  The ideal setting
 # depends on how your operating system processes characters.  The
 # default of 100000 usec (.1 seconds) was chosen because it works 
 # consistently in Windows.
 #
 # If your OS is losing characters during a paste, increase the paste
 # delay until it stops losing characters.
 #
 # Examples:
 #   keyboard_paste_delay: 100000
 #=======================================================================
 keyboard_paste_delay: 100000
 
 #=======================================================================
 # MOUSE: 
 # This option prevents Bochs from creating mouse "events" unless a mouse
 # is  enabled. The hardware emulation itself is not disabled by this.
 # You can turn the mouse on by setting enabled to 1, or turn it off by
 # setting enabled to 0. Unless you have a particular reason for enabling
 # the mouse by default, it is recommended that you leave it off.
 # You can also toggle the mouse usage at runtime (control key + middle
 # mouse button on X11, SDL, wxWidgets and Win32).
 # With the mouse type option you can select the type of mouse to emulate.
 # The default value is 'ps2'. The other choices are 'imps2' (wheel mouse
 # on PS/2), 'serial', 'serial_wheel' (one com port requires setting
 # 'mode=mouse') and 'usb' (3-button mouse - one of the USB ports must be
 # connected with the 'mouse' device - requires PCI and USB support).
 #
 # Examples:
 #   mouse: enabled=1
 #   mouse: enabled=1, type=imps2
 #   mouse: enabled=1, type=serial
 #   mouse: enabled=0
 #=======================================================================
 mouse: enabled=0
 
 #=======================================================================
 # private_colormap: Request that the GUI create and use it's own
 #                   non-shared colormap.  This colormap will be used
 #                   when in the bochs window.  If not enabled, a
 #                   shared colormap scheme may be used.  Not implemented
 #                   on all GUI's.
 #
 # Examples:
 #   private_colormap: enabled=1
 #   private_colormap: enabled=0
 #=======================================================================
 private_colormap: enabled=0
 
 #=======================================================================
 # fullscreen: ONLY IMPLEMENTED ON AMIGA
 #             Request that Bochs occupy the entire screen instead of a 
 #             window.
 #
 # Examples:
 #   fullscreen: enabled=0
 #   fullscreen: enabled=1
 #=======================================================================
 #fullscreen: enabled=0
 #screenmode: name="sample"
 
 #=======================================================================
 # ne2k: NE2000 compatible ethernet adapter
 #
 # Examples:
 # ne2k: ioaddr=IOADDR, irq=IRQ, mac=MACADDR, ethmod=MODULE, ethdev=DEVICE, script=SCRIPT
 #
 # ioaddr, irq: You probably won't need to change ioaddr and irq, unless there
 # are IRQ conflicts.
 #
 # mac: The MAC address MUST NOT match the address of any machine on the net.
 # Also, the first byte must be an even number (bit 0 set means a multicast
 # address), and you cannot use ff:ff:ff:ff:ff:ff because that's the broadcast
 # address.  For the ethertap module, you must use fe:fd:00:00:00:01.  There may
 # be other restrictions too.  To be safe, just use the b0:c4... address.
 #
 # ethdev: The ethdev value is the name of the network interface on your host
 # platform.  On UNIX machines, you can get the name by running ifconfig.  On
 # Windows machines, you must run niclist to get the name of the ethdev.
 # Niclist source code is in misc/niclist.c and it is included in Windows 
 # binary releases.
 #
 # script: The script value is optional, and is the name of a script that 
 # is executed after bochs initialize the network interface. You can use 
 # this script to configure this network interface, or enable masquerading.
 # This is mainly useful for the tun/tap devices that only exist during
 # Bochs execution. The network interface name is supplied to the script
 # as first parameter
 #
 # If you don't want to make connections to any physical networks,
 # you can use the following 'ethmod's to simulate a virtual network.
 #   null: All packets are discarded, but logged to a few files.
 #   arpback: ARP is simulated. Disabled by default.
 #   vde:  Virtual Distributed Ethernet
 #   vnet: ARP, ICMP-echo(ping), DHCP and read/write TFTP are simulated.
 #         The virtual host uses 192.168.10.1.
 #         DHCP assigns 192.168.10.2 to the guest.
 #         TFTP uses the ethdev value for the root directory and doesn't
 #         overwrite files.
 #
 #=======================================================================
 # ne2k: ioaddr=0x240, irq=9, mac=fe:fd:00:00:00:01, ethmod=fbsd, ethdev=en0 #macosx
 # ne2k: ioaddr=0x240, irq=9, mac=b0:c4:20:00:00:00, ethmod=fbsd, ethdev=xl0
 # ne2k: ioaddr=0x240, irq=9, mac=b0:c4:20:00:00:00, ethmod=linux, ethdev=eth0
 # ne2k: ioaddr=0x240, irq=9, mac=b0:c4:20:00:00:01, ethmod=win32, ethdev=MYCARD
 # ne2k: ioaddr=0x240, irq=9, mac=fe:fd:00:00:00:01, ethmod=tap, ethdev=tap0
 # ne2k: ioaddr=0x240, irq=9, mac=fe:fd:00:00:00:01, ethmod=tuntap, ethdev=/dev/net/tun0, script=./tunconfig
 # ne2k: ioaddr=0x240, irq=9, mac=b0:c4:20:00:00:01, ethmod=null, ethdev=eth0
 # ne2k: ioaddr=0x240, irq=9, mac=b0:c4:20:00:00:01, ethmod=vde, ethdev="/tmp/vde.ctl"
 # ne2k: ioaddr=0x240, irq=9, mac=b0:c4:20:00:00:01, ethmod=vnet, ethdev="c:/temp"
 
 #=======================================================================
 # KEYBOARD_MAPPING:
 # This enables a remap of a physical localized keyboard to a 
 # virtualized us keyboard, as the PC architecture expects.
 # If enabled, the keymap file must be specified.
 # 
 # Examples:
 #   keyboard_mapping: enabled=1, map=gui/keymaps/x11-pc-de.map
 #=======================================================================
 keyboard_mapping: enabled=0, map=
 
 #=======================================================================
 # KEYBOARD_TYPE:
 # Type of keyboard return by a "identify keyboard" command to the
 # keyboard controler. It must be one of "xt", "at" or "mf".
 # Defaults to "mf". It should be ok for almost everybody. A known
 # exception is french macs, that do have a "at"-like keyboard.
 #
 # Examples:
 #   keyboard_type: mf
 #=======================================================================
 #keyboard_type: mf
 
 #=======================================================================
 # USER_SHORTCUT:
 # This defines the keyboard shortcut to be sent when you press the "user"
 # button in the headerbar. The shortcut string is a combination of maximum
 # 3 key names (listed below) separated with a '-' character. The old-style
 # syntax (without the '-') still works for the key combinations supported
 # in Bochs 2.2.1.
 # Valid key names:
 # "alt", "bksl", "bksp", "ctrl", "del", "down", "end", "enter", "esc",
 # "f1", ... "f12", "home", "ins", "left", "menu", "minus", "pgdwn", "pgup",
 # "plus", "right", "shift", "space", "tab", "up", and "win".
 #
 # Example:
 #   user_shortcut: keys=ctrl-alt-del
 #=======================================================================
 #user_shortcut: keys=ctrl-alt-del
 
 #=======================================================================
 # I440FXSUPPORT:
 # This option controls the presence of the i440FX PCI chipset. You can
 # also specify the devices connected to PCI slots. Up to 5 slots are
 # available now. These devices are currently supported: ne2k, pcivga,
 # pcidev and pcipnic. If Bochs is compiled with Cirrus SVGA support
 # you'll have the additional choice 'cirrus'.
 #
 # Example:
 #   i440fxsupport: enabled=1, slot1=pcivga, slot2=ne2k
 #=======================================================================
 #i440fxsupport: enabled=1
 
 #=======================================================================
 # USB1:
 # This option controls the presence of the USB root hub which is a part
 # of the i440FX PCI chipset. With the portX option you can connect devices
 # to the hub (currently supported: 'mouse' and 'keypad'). If you connect
 # the mouse to one of the ports and use the mouse option 'type=usb' you'll
 # have a 3-button USB mouse.
 #
 # Example:
 #   usb1: enabled=1, port1=mouse, port2=keypad
 #=======================================================================
 #usb1: enabled=1
 
 #=======================================================================
 # CMOSIMAGE:
 # This defines image file that can be loaded into the CMOS RAM at startup.
 # The rtc_init parameter controls whether initialize the RTC with values stored
 # in the image. By default the time0 argument given to the clock option is used.
 # With 'rtc_init=image' the image is the source for the initial time.
 #
 # Example:
 #   cmosimage: file=cmos.img, rtc_init=image
 #=======================================================================
 #cmosimage: file=cmos.img, rtc_init=time0
 
 #=======================================================================
 # other stuff
 #=======================================================================
 #magic_break: enabled=1
 #load32bitOSImage: os=nullkernel, path=../kernel.img, iolog=../vga_io.log
 #load32bitOSImage: os=linux, path=../linux.img, iolog=../vga_io.log, initrd=../initrd.img
 #text_snapshot_check: enable
 
 #-------------------------
 # PCI host device mapping
 #-------------------------
 #pcidev: vendor=0x1234, device=0x5678
 
 #=======================================================================
 # GDBSTUB:
 # Enable GDB stub. See user documentation for details.
 # Default value is enabled=0.
 #=======================================================================
 #gdbstub: enabled=0, port=1234, text_base=0, data_base=0, bss_base=0
 
 #=======================================================================
 # IPS:
 # The IPS directive is DEPRECATED. Use the parameter IPS of the CPU
 # directive instead.
 #=======================================================================
 #ips: 10000000
 
 #=======================================================================
 # for Macintosh, use the style of pathnames in the following
 # examples.
 #
 # vgaromimage: :bios:VGABIOS-elpin-2.40
 # romimage: file=:bios:BIOS-bochs-latest, address=0xf0000
 # floppya: 1_44=[fd:], status=inserted
 #=======================================================================