NAME
bochsrc - Configuration file for Bochs.DESCRIPTION
Bochsrc is the configuration file that specifies where Bochs should look for disk images, how the Bochs emulation layer should work, etc. The syntax used for bochsrc can also be used as command line arguments for Bochs. The .bochsrc file should be placed either in the current directory before running Bochs or in your home directory.floppya: 1_44="$IMAGES/bootdisk.img", status=inserted
OPTIONS
- #include
- This option includes another configuration file. It is
possible to put installation defaults in a global config file (e.g.
location of rom images).
Example:
#include /etc/bochsrc
- plugin_ctrl:
- Controls the presence of optional device plugins. These
plugins are loaded directly with this option and some of them install a
config option that is only available when the plugin device is loaded. The
value "1" means to load the plugin and "0" will unload
it (if loaded before).
These plugins will be loaded by default (if present): 'biosdev',
'extfpuirq', 'gameport', 'iodebug','parallel', 'serial', 'speaker' and
'unmapped'.
These plugins are also supported, but they are usually loaded directly with
their bochsrc option: 'e1000', 'es1370', 'ne2k', 'pcidev', 'pcipnic',
'sb16', 'usb_ehci', 'usb_ohci', 'usb_uhci', 'usb_xhci' and 'voodoo'.
Example:
plugin_ctrl: unmapped=0, e1000=1 # unload 'unmapped' and load 'e1000'
- 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. Depending on the platform there are up to 3 choices of
configuration interface: a text mode version called "textconfig"
and two graphical versions called "win32config" and
"wx". The text mode version uses stdin/stdout or gui console (if
available / runtime config) and is always compiled in, unless Bochs is
compiled for wx only. The choice "win32config" is only available
on win32/win64 and it is the default on these platforms. The choice
"wx" is only available when Bochs is compiled with wxWidgets
support. 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.
Example:
config_interface: textconfig
- 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 X windows interface, cross platform
win32 native win32 libraries
carbon Carbon library (for MacOS X)
macintosh MacOS pre-10
amigaos native AmigaOS libraries
sdl SDL 1.2.x library, cross platform
sdl2 SDL 2.x library, cross platform
term text only, uses curses/ncurses library, cross platform
rfb provides an interface to AT&T's VNC viewer, cross platform
vncsrv use LibVNCServer for extended RFB(VNC) support
wx 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 options to control their behaviour. These options are supported by more than one display library:
"cmdmode" - call a headerbar button handler after pressing F7 (x, sdl, sdl2)
"fullscreen" - startup in fullscreen mode (sdl, sdl2)
"gui_debug" - use GTK debugger gui (sdl, sdl2, x)
"hideIPS" - disable IPS output in status bar (rfb, sdl, sdl2, term, vncsrv, wx, x)
"nokeyrepeat" - turn off host keyboard repeat (sdl, sdl2, x)
"no_gui_console" - use system console instead of builtin gui console (rfb, sdl, sdl2, vncsrv, x)
"timeout" - time (in seconds) to wait for client (rfb, vncsrv) NOTE: Setting up options without specifying display library is also supported. Examples:
display_library: x
display_library: sdl2, options=fullscreen,hideIPS
display_library: options=cmdmode
- cpu:
- This defines cpu-related parameters inside Bochs:
model:
Selects CPU configuration to emulate from pre-defined list of all supported
configurations. When this option is used and the value is different from
'bx_generic', the parameters of the CPUID option have no effect anymore.
See the bochsrc sample for supported values.
count:
Set the number of processors:cores per processor:threads per core when Bochs
is compiled for SMP emulation. Bochs currently supports up to 14 threads
(legacy APIC) or 254 threads (xAPIC or higher) running simultaniosly. If
Bochs is compiled without SMP support, it won't accept values different
from 1.
quantum:
Maximum amount of instructions allowed to execute by processor before
returning control to another cpu. This option exists only in Bochs binary
compiled with SMP support.
reset_on_triple_fault:
Reset the CPU when triple fault occur (highly recommended) rather than
PANIC. Remember that if you trying to continue after triple fault the
simulation will be completely bogus !
cpuid_limit_winnt:
Determine whether to limit maximum CPUID function to 2. This mode is
required to workaround WinNT installation and boot issues.
mwait_is_nop:
When this option is enabled MWAIT will not put the CPU into a sleep state.
This option exists only if Bochs compiled with --enable-monitor-mwait.
msrs:
Define path to user CPU Model Specific Registers (MSRs) specification. See
example in msrs.def.
ignore_bad_msrs:
Ignore MSR references that Bochs does not understand; print a warning
message instead of generating #GP exception. This option is enabled by
default but will not be available if configurable MSRs are enabled.
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.
Example Specifications[1]
Bochs Machine/Compiler Mips 2.4.6 3.4Ghz Core i7 2600 w/ Win7x64/g++ 4.5.2 85-95 Mips 2.3.7 3.2Ghz Core 2 Q9770 w/ WinXP/g++ 3.4 50-55 Mips 2.3.7 2.6Ghz Core 2 Duo w/ WinXP/g++ 3.4 38-43 Mips 2.2.6 2.6Ghz Core 2 Duo w/ WinXP/g++ 3.4 21-25 Mips 2.2.6 2.1Ghz Athlon XP w/ Linux 2.6/g++ 3.4 12-15 Mips
[1] IPS measurements depend on OS and compiler configuration in addition to processor clock speed. Example:
cpu: count=2, ips=10000000, msrs="msrs.def"
- cpuid:
- This defines features and functionality supported by Bochs
emulated CPU:
level:
Set emulated CPU level information returned by CPUID. Default value is
determined by configure option --enable-cpu-level. Currently supported
values are 5 (for Pentium and similar processors) and 6 (for P6 and later
processors).
family:
Set family information returned by CPUID. Default family value determined by
configure option --enable-cpu-level.
model:
Set model information returned by CPUID. Default model value is 3.
stepping:
Set stepping information returned by CPUID. Default stepping value is 3.
vendor_string:
Set the CPUID vendor string returned by CPUID(0x0). This should be a
twelve-character ASCII string.
brand_string:
Set the CPUID vendor string returned by CPUID(0x80000002 .. 0x80000004).
This should be at most a forty-eight-character ASCII string.
mmx:
Select MMX instruction set support. This option exists only if Bochs
compiled with BX_CPU_LEVEL >= 5.
apic:
Select APIC configuration (LEGACY/XAPIC/XAPIC_EXT/X2APIC). This option
exists only if Bochs compiled with BX_CPU_LEVEL >= 5.
sep:
Select SYSENTER/SYSEXIT instruction set support. This option exists only if
Bochs compiled with BX_CPU_LEVEL >= 6.
simd:
Select SIMD instructions support. Any of
NONE/SSE/SSE2/SSE3/SSSE3/SSE4_1/SSE4_2/AVX/AVX2/AVX512 could be selected.
This option exists only if Bochs compiled with BX_CPU_LEVEL >= 6. The AVX
choises exists only if Bochs compiled with --enable-avx option.
sse4a:
Select AMD SSE4A instructions support. This option exists only if Bochs
compiled with BX_CPU_LEVEL >= 6.
misaligned_sse:
Select AMD Misaligned SSE mode support. This option exists only if Bochs
compiled with BX_CPU_LEVEL >= 6.
aes:
Select AES instruction set support. This option exists only if Bochs
compiled with BX_CPU_LEVEL >= 6.
sha:
Select SHA instruction set support. This option exists only if Bochs
compiled with BX_CPU_LEVEL >= 6.
movbe:
Select MOVBE Intel(R) Atom instruction support. This option exists only if
Bochs compiled with BX_CPU_LEVEL >= 6.
adx:
Select ADCX/ADOX instructions support. This option exists only if Bochs
compiled with BX_CPU_LEVEL >= 6.
xsave:
Select XSAVE extensions support. This option exists only if Bochs compiled
with BX_CPU_LEVEL >= 6.
xsaveopt:
Select XSAVEOPT instruction support. This option exists only if Bochs
compiled with BX_CPU_LEVEL >= 6.
avx_f16c:
Select AVX float16 convert instructions support. This option exists only if
Bochs compiled with --enable-avx option.
avx_fma:
Select AVX fused multiply add (FMA) instructions support. This option exists
only if Bochs compiled with --enable-avx option.
bmi:
Select BMI1/BMI2 instructions support. This option exists only if Bochs
compiled with --enable-avx option.
fma4:
Select AMD four operand FMA instructions support. This option exists only if
Bochs compiled with --enable-avx option.
xop:
Select AMD XOP instructions support. This option exists only if Bochs
compiled with --enable-avx option.
tbm:
Select AMD TBM instructions support. This option exists only if Bochs
compiled with --enable-avx option.
x86_64:
Enable x85-64 and long mode support. This option exists only if Bochs
compiled with x86-64 support.
1g_pages:
Enable 1G page size support in long mode. This option exists only if Bochs
compiled with x86-64 support.
pcid:
Enable Process-Context Identifiers (PCID) support in long mode. This option
exists only if Bochs compiled with x86-64 support.
smep:
Enable Supervisor Mode Execution Protection (SMEP) support. This option
exists only if Bochs compiled with BX_CPU_LEVEL >= 6.
smap:
Enable Supervisor Mode Access Prevention (SMAP) support. This option exists
only if Bochs compiled with BX_CPU_LEVEL >= 6.
mwait:
Select MONITOR/MWAIT instructions support. This option exists only if Bochs
compiled with --enable-monitor-mwait.
vmx:
Select VMX extensions emulation support. This option exists only if Bochs
compiled with --enable-vmx option.
svm:
Select AMD SVM (Secure Virtual Machine) extensions emulation support. This
option exists only if Bochs compiled with --enable-svm option.
Example:
cpuid: mmx=1, sep=1, sse=sse4_2, xapic=1, aes=1, movbe=1, xsave=1
- memory:
- Set the amount of physical memory you want to emulate.
guest:
Set amount of guest physical memory to emulate. The default is 32MB, the
maximum amount limited only by physical address space limitations.
host:
Set amount of host memory you want to allocate for guest RAM emulation. It
is possible to allocate less memory than you want to emulate in guest
system. This will fake guest to see the non-existing memory. Once guest
system touches new memory block it will be dynamically taken from the
memory pool. You will be warned (by FATAL PANIC) in case guest already
used all allocated host memory and wants more.
Example:
memory: guest=512, host=256
- megs:
- The 'megs:' option sets the 'guest' and 'host' memory
parameters to the same value. In all other cases the 'memory' option
should be used instead.
Example:
megs: 32
- 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 default ROM BIOS is
usually loaded starting at address 0xfffe0000, and it is exactly 128k
long. The legacy version of the Bochs BIOS is usually loaded starting at
address 0xffff0000, and it is exactly 64k long. You can use the
environment variable $BXSHARE to specify the location of the BIOS. The
usage of external large BIOS images (up to 512k) at memory top is now
supported, but we still recommend to use the BIOS distributed with Bochs.
The start address is optional, since it can be calculated from image size.
The Bochs BIOS currently supports only the option "fastboot" to
skip the boot menu delay.
Examples:
romimage: file=bios/BIOS-bochs-latest, options=fastboot
romimage: file=$BXSHARE/BIOS-bochs-legacy
romimage: file=mybios.bin, address=0xfff80000
- vgaromimage:
- You also need to load a VGA ROM BIOS into 0xC0000.
Examples:
vgaromimage: file=bios/VGABIOS-elpin-2.40
vgaromimage: file=bios/VGABIOS-lgpl-latest
vgaromimage: file=$BXSHARE/VGABIOS-lgpl-latest
- optromimage1: , optromimage2: , optromimage3: or optromimage4:
- 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). It
can also be a convenient way to upload some arbitrary code/data in the
simulation, that can be retrieved by the boot loader
Example:
optromimage1: file=optionalrom.bin, address=0xd0000
- vga:
- This defines parameters related to the VGA display.
extension:
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, 'cirrus' for Cirrus SVGA support and 'voodoo' for
Voodoo Graphics support (see 'voodoo' option).
update_freq:
This parameter specifies the number of display updates per second. The VGA
update timer by default uses the realtime engine with a value of 5. This
parameter can be changed at runtime.
realtime:
If set to 1 (default), the VGA timer is based on realtime, otherwise it is
driven by the cpu and depends on the ips setting. If the host is slow (low
ips, update_freq) and the guest uses HLT appropriately, setting this to 0
and "clock: sync=none" may improve the responsiveness of the
guest GUI when the guest is otherwise idle.
ddc:
This parameter defines the behaviour of the DDC emulation that returns the
monitor EDID data. By default the 'builtin' values for 'Bochs Screen' are
used. Other choices are 'disabled' (no DDC emulation) and 'file' (read
monitor EDID from file / path name separated with a colon).
Examples:
vga: extension=none, update_freq=10, realtime=0, ddc=disabled
vga: extension=cirrus, update_freq=30, ddc=file:monitor.bin
vga: extension=vbe
- voodoo:
- This defines the Voodoo Graphics emulation (experimental).
Currently supported models are 'voodoo1', 'voodoo2', 'banshee' and
'voodoo3'. The Voodoo2 support is not yet complete, but almost usable. The
Banshee / Voodoo3 support is under construction, but basically usable. The
2D/3D cards require an external VGA BIOS the vga extension option to be
set to 'voodoo'. If the i440BX PCI chipset is selected, they can be
assigned to AGP (slot #5). The gui screen update timing for all models is
controlled by the related 'vga' options.
Example:
voodoo: enabled=1, model=voodoo1
- keyboard:
- This defines parameters related to the emulated keyboard:
type:
Type of keyboard return by a "identify keyboard" command to the
keyboard controller. 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.
serial_delay:
Approximate time in microseconds that it takes one character to be
transferred from the keyboard to controller over the serial path.
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.
keymap:
This enables a remap of a physical localized keyboard to a virtualized us
keyboard, as the PC architecture expects.
user_shortcut:
This defines the keyboard shortcut to be sent when you press the
"user" button in the header bar. The shortcut string is a
combination of maximum 3 key names (listed below) separated with a '-'
character.
Valid key names:
"alt", "bksl", "bksp", "ctrl",
"del", "down", "end", "enter",
"esc", "f1", ... "f12", "home",
"ins", "left", "menu", "minus",
"pgdwn", "pgup", "plus", "power",
"print", "right", "scrlck",
"shift", "space", "tab", "up" and
"win".
Examples:
keyboard: type=mf, serial_delay=200, paste_delay=100000
keyboard: keymap=gui/keymaps/x11-pc-de.map
keyboard: user_shortcut=ctrl-alt-del
- mouse:
- This defines parameters for the emulated mouse type, the
initial status of the mouse capture and the runtime method to toggle it.
type
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', 'serial_msys' (one com port requires
setting 'mode=mouse') 'inport' and 'bus' (if present). To connect a mouse
to a USB port, see the 'usb_uhci', 'usb_ohci', 'usb_ehci' or 'usb_xhci'
option (requires PCI and USB support).
enabled
The Bochs gui creates mouse "events" unless the 'enabled' option
is set to 0. The hardware emulation itself is not disabled by this. 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 (RFB, SDL, Win32, wxWidgets and X11 - see below).
toggle
The default method to toggle the mouse capture at runtime is to press the
CTRL key and the middle mouse button ('ctrl+mbutton'). This option allows
to change the method to 'ctrl+f10' (like DOSBox), 'ctrl+alt' (like QEMU)
or 'f12'.
Examples:
mouse: enabled=1
mouse: type=imps2, enabled=1
mouse: type=serial, enabled=1
mouse: enabled=0, toggle=ctrl+f10
- pci:
- This defines the parameters to set up the Bochs PCI
emulation:
enabled
If Bochs is compiled with PCI support, it is enabled by default.
chipset
Currently the chipsets i430FX, i440FX and i440BX (limited) are supported and
the default is i440FX.
slotX
It is possible to specify the devices connected to PCI slots. Up to 5 slots
are available. For combined PCI/ISA devices assigning to slot is mandatory
if the PCI model should be emulated (cirrus, ne2k and pcivga). Setting up
slot for PCI-only devices is also supported, but they are auto-assigned if
not specified (e1000, es1370, pcidev, pcipnic, usb_ehci, usb_ohci,
usb_xhci, voodoo). All device models except the network devices ne2k and
e1000 can be used only once in the slot configuration. In case of the
i440BX chipset, the slot #5 is the AGP slot. Currently only the 'voodoo'
device can be assigned to AGP.
advopts
With the advanced PCI options it is possible to control the behaviour of the
PCI chipset. These options can be specified as comma-separated values. By
default the "Bochs i440FX" chipset enables the ACPI and HPET
devices, but original i440FX doesn't support them. The options 'noacpi'
and 'nohpet' make it possible to disable them. The option 'noagp' disables
the incomplete AGP subsystem of the i440BX chipset.
Example:
pci: enabled=1, chipset=i440fx, slot1=pcivga, slot2=ne2k, advopts=noacpi
- clock:
- This defines the parameters of the clock inside Bochs.
sync
This defines the method how to synchronize the Bochs internal time with
realtime. With the value 'none' the Bochs time relies on the IPS value and
no host time synchronization is used. The 'slowdown' method sacrifices
performance to preserve reproducibility while allowing host time
correlation. The 'realtime' method sacrifices reproducibility to preserve
performance and host-time correlation. It is possible to enable both
synchronization methods.
rtc_sync
If this option is enabled together with the realtime synchronization, the
RTC runs at realtime speed. This feature is disabled by default.
time0
Specifies the start (boot) time of the virtual machine. Use a time value as
returned by the time(2) system call or a string as returned by the
ctime(3) 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] Default value are sync=none, rtc_sync=0, time0=local Example:
clock: sync=realtime, time0=938581955 # Wed Sep 29 07:12:35 1999
clock: sync=realtime, time0="Sat Jan 1 00:00:00 2000" # 946681200
- cmosimage:
- This defines a binary image file with size 128 bytes 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=time0
- private_colormap:
- Requests 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. Once again, enabled=1 turns
on this feature and 0 turns it off.
Example:
private_colormap: enabled=1
- floppya: or floppyb:
-
Point this to the pathname of a floppy image file or device. Floppya is the
first drive, and floppyb is the second drive. If you're booting from a
floppy, floppya should point to a bootable disk.
You can set the initial status of the media to 'ejected' or 'inserted'.
Usually you will want to use 'inserted'.
The parameter 'type' can be used to enable the floppy drive without media
and status specified. Usually the drive type is set up based on the media
type.
The optional parameter 'write_protected' can be used to control the media
write protect switch. By default it is turned off.
Example:
2.88M 3.5" media:
floppya: 2_88=path, status=ejected 1.44M 3.5" media (write protected):
floppya: 1_44=path, status=inserted, write_protected=1 1.2M 5.25" media:
floppyb: 1_2=path, status=ejected 720K 3.5" media:
floppya: 720k=path, status=inserted 360K 5.25" media:
floppya: 360k=path, status=inserted Autodetect floppy media type:
floppya: image=path, status=inserted Use directory as 1.44M VFAT media:
floppya: 1_44=vvfat:path, status=inserted 1.44M 3.5" floppy drive, no media:
floppya: type=1_44
- ata0: , ata1: , ata2: or ata3:
-
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
- ata[0-3]-master: or ata[0-3]-slave:
-
This defines the type and characteristics of all attached ata devices:
type= type of attached device [disk|cdrom]
path= path of the image
mode= image mode [flat|concat|sparse|vmware3|vmware4|undoable|growing|volatile|vpc|vbox|vvfat], only valid for disks
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 [auto|cmos|none]
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, volatile and vvfat disks Point this at a hard disk image file, cdrom iso file, or a 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 is possible to use a raw device as a Bochs hard disk, but WE DON'T RECOMMEND IT. The path is mandatory for hard disks. Disk geometry autodetection works with images created by bximage if CHS is set to 0/0/0 (cylinders are calculated using heads=16 and spt=63). For other hard disk images and modes the cylinders, heads, and spt are mandatory. In all cases the disk size reported from the image must be exactly C*H*S*512. The mode option defines how the disk image is handled. Disks can be defined as:
- flat : one file flat layout
- concat : multiple files layout
- sparse : stackable, commitable, rollbackable
- vmware3 : vmware3 disk support
- vmware4 : vmware4 disk support (aka VMDK)
- undoable : flat file with commitable redolog
- growing : growing file
- volatile : flat file with volatile redolog
- vpc : fixed / dynamic size VirtualPC image
- vbox : fixed / dynamic size Oracle(tm) VM VirtualBox image (VDI version 1.1)
- vvfat: local directory appears as read-only VFAT disk (with volatile redolog) The disk translation scheme (implemented in legacy int13 bios functions, and used by older operating systems like MS-DOS), can be defined as:
- none : no translation, for disks up to 528MB (1032192 sectors)
- large : a standard bitshift algorithm, for disks up to 4.2GB (8257536 sectors)
- rechs : a revised bitshift algorithm, using a 15 heads fake physical geometry, for disks up to 7.9GB (15482880 sectors). (don't use this unless you understand what you're doing)
- lba : a standard lba-assisted algorithm, for disks up to 8.4GB (16450560 sectors)
- auto : autoselection of best translation scheme. (it should be changed if system does not boot) 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, path=10M.sample, cylinders=306, heads=4, spt=17
ata0-slave: type=disk, path=20M.sample, cylinders=615, heads=4, spt=17
ata1-master: type=disk, path=30M.sample, cylinders=615, heads=6, spt=17
ata1-slave: type=disk, path=46M.sample, cylinders=940, heads=6, spt=17
ata2-master: type=disk, path=62M.sample, cylinders=940, heads=8, spt=17
ata2-slave: type=disk, path=112M.sample, cylinders=900, heads=15, spt=17
ata3-master: type=disk, path=483M.sample, cylinders=1024, heads=15, spt=63
ata3-slave: type=cdrom, path=iso.sample, status=inserted
- boot:
- This defines the boot sequence. Now you can specify up to 3
boot drives, which can be 'floppy', 'disk', 'cdrom' or 'network' (boot
ROM). Legacy 'a' and 'c' are also supported.
Example:
boot: cdrom, floppy, disk
- floppy_bootsig_check:
- This disables the 0xaa55 signature check on boot floppies
The check is enabled by default.
Example:
floppy_bootsig_check: disabled=1
- log:
- Give the path of the log file you'd like Bochs debug and
misc. verbiage to be written to. If you really don't want it, make it
/dev/null.
Example:
log: bochs.out
log: /dev/tty (unix only)
log: /dev/null (unix only)
- 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 cpu0 current eip
%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
- panic:
- If Bochs reaches a condition where it cannot emulate
correctly, it does a panic. This can be a configuration problem (like a
misspelled bochsrc line) or an emulation problem (like an unsupported
video mode). The "panic" setting in bochsrc tells Bochs how to
respond to a panic. You can set this to fatal (terminate the session), ask
(ask user how to proceed) or report (print information to the log file).
The safest setting is action=fatal or action=ask. If you are getting panics,
you can try action=report instead. If you allow Bochs to continue after a
panic, don't be surprised if you get strange behavior or crashes if a
panic occurs. Please report panic messages unless it is just a
configuration problem like "could not find hard drive image."
Examples:
panic: action=fatal
panic: action=ask
- error:
- Bochs produces an error message when it finds a condition
that really shouldn't happen, but doesn't endanger the simulation. An
example of an error might be if the emulated software produces an illegal
disk command.
The "error" setting tells Bochs how to respond to an error
condition. You can set this to fatal (terminate the session), ask (ask
user how to proceed), warn (show dialog with message and continue), report
(print information to the log file), or ignore (do nothing).
Example:
error: action=report
error: action=warn
- info:
- This setting tells Bochs what to do when an event occurs
that generates informational messages. You can set this to report (print
information to the log file), or ignore (do nothing). For general usage,
the "report" option is probably a good choice.
Example:
info: action=report
- debug:
- This setting tells Bochs what to do with messages intended
to assist in debugging. You can set this to report (print information to
the log file), or ignore (do nothing). You should generally set this to
ignore, unless you are trying to diagnose a particular problem.
NOTE: When action=report, Bochs may spit out thousands of debug
messages per second, which can impact performance and fill up your disk.
Example:
debug: action=ignore
- 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 '-'.
Example:
log: debugger.out
log: /dev/null (unix only)
log: -
- com1: , com2: , com3: or com4:
- This defines a serial port (UART type 16550A). In the
'term' mode 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.
In socket* and pipe* (win32 only) modes Bochs becomes either socket/named
pipe client or server. In client mode it connects to an already running
server (if connection fails Bochs treats com port as not connected). In
server mode it opens socket/named pipe and waits until a client
application connects to it before starting simulation. This mode is useful
for remote debugging (e.g. with gdb's "target remote host:port"
command or windbg's command line option -k com:pipe,port=\.ipeipename).
Socket modes use simple TCP communication, pipe modes use duplex byte mode pipes. Other serial modes are 'null' (no input/output), 'file' (output to a file specified as the 'dev' parameter and changeable at runtime), 'raw' (use the real serial port - partly implemented on win32) and 'mouse' (standard serial mouse - requires mouse option setting 'type=serial', 'type=serial_wheel' or 'type=serial_msys') Examples:
com1: enabled=1, mode=term, dev=/dev/ttyp7
com2: enabled=1, mode=file, dev=serial.out
com1: enabled=1, mode=mouse
- parport1: or 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). The output file can be changed at runtime.
Examples:
parport1: enabled=1, file=parport.out
parport2: enabled=1, file="/dev/lp0"
parport1: enabled=0
- sound:
- This defines the lowlevel sound driver(s) for the wave
(PCM) input / output and the MIDI output feature and (if necessary) the
devices to be used. It can have several of the following properties. All
properties are in the format sound: property=value
waveoutdrv:
This defines the driver to be used for the waveout feature.
Possible values are 'file' (all wave data sent to file), 'dummy' (no
output) and the platform-dependant drivers 'alsa', 'oss', 'osx', 'sdl'
and 'win'. waveout:
This defines the device to be used for wave output (if necessary) or
the output file for the 'file' driver. waveindrv:
This defines the driver to be used for the wavein feature.
Possible values are 'dummy' (recording silence) and platform-dependent
drivers 'alsa', 'oss', 'sdl' and 'win'. wavein:
This defines the device to be used for wave input (if necessary). midioutdrv:
This defines the driver to be used for the MIDI output feature.
Possible values are 'file' (all MIDI data sent to file), 'dummy' (no
output) and platform-dependent drivers 'alsa', 'oss', 'osx' and 'win'. midiout:
This defines the device to be used for MIDI output (if necessary). driver:
This defines the driver to be used for all sound features with one
property. Possible values are 'default' (platform default) and all
other choices described above. Overriding one or more settings with
the specific driver parameter is possible. Example for one driver (uses platform-default):
sound: driver=default, waveout=/dev/dsp Example for different drivers:
sound: waveoutdrv=sdl, waveindrv=alsa, midioutdrv=dummy
- speaker:
- This defines the PC speaker output mode. In the 'sound'
mode the beep is generated by the square wave generator which is a part of
the lowlevel sound support. In this mode the 'volume' parameter can be
used to set the output volume (0 - 15). The 'system' mode is only
available on Linux and Windows. On Linux /dev/console is used for output
and on Windows the Beep() function. The 'gui' mode forwards the beep to
the related gui methods (currently only used by the Carbon gui).
Example:
speaker: enabled=1, mode=sound, volume=15
- sb16:
- This defines the SB16 sound emulation. It can have several
of the following properties. All properties are in this format:
sb16: property=value PROPERTIES FOR sb16: enabled:
This optional property controls the presence of the SB16 emulation.
The emulation is turned on unless this property is used and set to 0. midimode:
This parameter specifies what to do with the MIDI output.
0 = no output
1 = output to device specified with the sound option (system dependent)
2 = MIDI or raw data output to file (depends on file name extension)
3 = dual output (mode 1 and 2 at the same time) midifile:
This is the file where the midi output is stored (midimode 2 or 3). wavemode:
This parameter specifies what to do with the PCM output.
0 = no output
1 = output to device specified with the sound option (system dependent)
2 = VOC, WAV or raw data output to file (depends on file name extension)
3 = dual output (mode 1 and 2 at the same time) wavefile:
This is the file where the wave output is stored (wavemode 2 or 3). 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 information.
It is possible to change the loglevel at runtime. 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. It is possible to adjust the dmatimer at runtime. Examples for output modes:
sb16: midimode=2, midifile="output.mid", wavemode=1 # MIDI to file
sb16: midimode=1, wavemode=3, wavefile="output.wav" # wave to file and device
- es1370:
- This defines the ES1370 sound emulation (recording and
playback - except DAC1+DAC2 output at the same time). The parameter
'enabled' controls the presence of the device. The wave and MIDI output
can be sent to device, file or both using the parameters 'wavemode',
'wavefile', 'midimode' and 'midifile'. See the description of these
parameters at the SB16 directive.
Example for using 'sound' parameters:
es1370: enabled=1, wavemode=1 Example for sending output to file:
es1370: enabled=1, wavemode=2, wavefile=output.voc
- ne2k:
- Defines the characteristics of an attached ne2000 isa card
:
card=CARD,
type=TYPE,
ioaddr=IOADDR,
irq=IRQ,
mac=MACADDR,
ethmod=MODULE,
ethdev=DEVICE,
script=SCRIPT,
bootrom=BOOTROM PROPERTIES FOR ne2k: CARD: This is the zero-based card number to configure with this ne2k config line. Up to 4 devices are supported now (0...3). If not specified, the following parameters apply to card #0. TYPE: This is the card type to emulate ('isa' or 'pci'). If not specified, card #0 defaults to 'pci' if assigned to a pci slot. For the additional cards the type parameter should be set up. IOADDR, IRQ: You probably won't need to change ioaddr and irq, unless there are IRQ conflicts. These parameters are ignored if the NE2000 is assigned to a PCI slot. 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. ETHMOD: The ethmod value defines which low level OS specific module to be used to access physical ethernet interface. Current implemented values include
- fbsd : ethernet on freebsd and openbsd
- linux : ethernet on linux
- win32 : ethernet on win32
- tap : ethernet through a linux tap interface
- tuntap : ethernet through a linux tuntap interface
- slirp : built-in Slirp support with DHCP / TFTP servers 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
- vde : Virtual Distributed Ethernet
- vnet : ARP, ICMP-echo(ping), DHCP, DNS, FTP and TFTP are simulated
The virtual host uses 192.168.10.1
DHCP assigns 192.168.10.15 to the guest
The FTP and TFTP servers use 'ethdev' for the root directory
TFTP doesn't overwrite files, DNS for server and client only
- socket : Connect up to 6 Bochs instances with external program 'bxhub'
(simulating an ethernet hub). It provides the same services as the
'vnet' module and assigns IP addresses like 'slirp' (10.0.2.x). 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. The 'socket' module uses this parameter to specify the UDP port for receiving packets and (optional) the host to connect. 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. The 'slirp' module uses this parameter to specify a config file for setting up an alternative IP configuration or additional features. The 'vnet' module also uses this parameter to specify a config file similar to slirp, but with only a few settings. BOOTROM: The bootrom value is optional, and is the name of the ROM image to load. Note that this feature is only implemented for the PCI version of the NE2000. Examples:
ne2k: ioaddr=0x300, irq=9, mac=b0:c4:20:00:00:00, ethmod=fbsd, ethdev=xlo
ne2k: ioaddr=0x300, irq=9, mac=b0:c4:20:00:00:00, ethmod=linux, ethdev=eth0
ne2k: ioaddr=0x300, irq=9, mac=b0:c4:20:00:00:01, ethmod=win32, ethdev=MYCARD
ne2k: ioaddr=0x300, irq=9, mac=fe:fd:00:00:00:01, ethmod=tap, ethdev=tap0
ne2k: ioaddr=0x300, irq=9, mac=fe:fd:00:00:00:01, ethmod=tuntap, ethdev=/dev/net/tun0, script=./tunconfig
ne2k: ioaddr=0x300, irq=9, mac=b0:c4:20:00:00:01, ethmod=vde, ethdev="/tmp/vde.ctl"
ne2k: ioaddr=0x300, irq=9, mac=b0:c4:20:00:00:01, ethmod=vnet, ethdev="c:/temp"
ne2k: mac=b0:c4:20:00:00:01, ethmod=socket, ethdev=40000 # use localhost
ne2k: card=0, mac=b0:c4:20:00:00:01, ethmod=socket, ethdev=mymachine:40000
ne2k: mac=b0:c4:20:00:00:01, ethmod=slirp, script=slirp.conf, bootrom=ne2k_pci.rom
- pcipnic:
- To support the Bochs/Etherboot pseudo-NIC, Bochs must be
compiled with the --enable-pnic configure option. It accepts the same
syntax (for mac, ethmod, ethdev, script, bootrom) and supports the same
networking modules as the NE2000 adapter.
Example:
pnic: enabled=1, mac=b0:c4:20:00:00:00, ethmod=vnet
- e1000:
- To support the Intel(R) 82540EM Gigabit Ethernet adapter,
Bochs must be compiled with the --eanble-e1000 configure option. The E1000
accepts the same syntax (for card, mac, ethmod, ethdev, script, bootrom)
and supports the same networking modules as the NE2000 adapter.
Example:
e1000: card=0, enabled=1, mac=52:54:00:12:34:56, ethmod=slirp, script=slirp.conf
- usb_uhci:
- This option controls the presence of the USB root hub which
is a part of the i440FX PCI chipset. With the portX parameter you can
connect devices to the hub (currently supported: 'mouse', 'tablet',
'keypad', 'keyboard', 'disk', 'cdrom', 'floppy', 'hub' and 'printer').
If you connect the mouse or tablet to one of the ports, Bochs forwards the
mouse movement data to the USB device instead of the selected mouse type.
When connecting the keypad to one of the ports, Bochs forwards the input
of the numeric keypad to the USB device instead of the PS/2 keyboard. If
the keyboard is selected, all key events are sent to the USB device.
To connect a disk image as a USB hardisk you can use the 'disk' device. Use
the 'path' option in the optionsX parameter to specify the path to the
image separated with a colon. To use other disk image modes similar to ATA
disks the syntax 'path:mode:filename' must be used (see below).
To emulate a USB cdrom you can use the 'cdrom' device and the path to an ISO
image or raw device name can be set with the 'path' option in the optionsX
parameter also separated with a colon. An option to insert/eject media is
available in the runtime configuration.
To emulate a USB floppy you can use the 'floppy' device and the path to a
floppy image can be set with the 'path' option in the optionsX parameter
separated with a colon. To use the VVFAT image mode similar to the legacy
floppy the syntax 'path:vvfat:directory' must be used (see below). An
option to insert/eject media is available in the runtime configuration.
The device name 'hub' connects an external hub with max. 8 ports (default:
4) to the root hub. To specify the number of ports you have to use the
'ports' option in the optionsX parameter with the value separated with a
colon. Connecting devices to the external hub ports is only available in
the runtime configuration.
The device 'printer' emulates the HP Deskjet 920C printer. The PCL data is
sent to a file specified in the 'file' option with the optionsX parameter.
The current code appends the PCL code to the file if the file already
existed. The output file can be changed at runtime.
The optionsX parameter can be used to assign specific options to the device
connected to the corresponding USB port. The option 'speed' can be used to
set the speed reported by device ('low', 'full', 'high' or 'super'). The
available speed choices depend on both HC and device. The option 'debug'
turns on debug output for the device at connection time. The option 'pcap'
turns on packet logging in PCAP format. For the USB 'disk' device the
optionsX parameter can be used to specify an alternative redolog file
(journal) of some image modes. For 'vvfat' mode USB disks the optionsX
parameter can be used to specify the disk size (range 128M ... 128G). If
the size is not specified, it defaults to 504M. For the USB 'floppy'
device the optionsX parameter can be used to specify an alternative device
ID to be reported. Currently only the model "teac" is supported
(can fix hw detection in some guest OS). The USB floppy also accepts the
parameter "write_protected" with valid values 0 and 1 to select
the access mode (default is 0).
Examples:
usb_uhci: port1=mouse, port2=disk, options2="path:usbstick.img"
usb_uhci: port1=hub, options1="ports:6"
usb_uhci: port2=disk, options2="path:undoable:usbdisk.img, journal:u.redolog"
usb_uhci: port2=disk, options2=""path:usbdisk2.img, sect_size:1024"
usb_uhci: port2=disk, options2="path:vvfat:vvfat, debug, speed:full"
usb_uhci: port2=cdrom, options2="path:image.iso"
usb_uhci: port1=printer, options1="file:printdata.bin"
usb_uhci: port2=floppy, options2="path:vvfat:diskette, model:teac"
- usb_ohci:
- This option controls the presence of the USB OHCI host
controller with a 2-port hub. The portX parameter accepts the same device
types with the same syntax as the UHCI controller (see above). The
optionsX parameter is also available on OHCI.
Example:
usb_ohci: enabled=1
- usb_ehci:
- This option controls the presence of the USB EHCI host
controller with a 6-port hub. The portX parameter accepts the same device
types with the same syntax as the UHCI controller (see above). The
optionsX parameter is also available on EHCI.
Example:
usb_ehci: enabled=1, port1=tablet, options1="speed:high"
- usb_xhci:
- This option controls the presence of the USB xHCI host
controller with a 4-port hub. The portX parameter accepts the same device
types with the same syntax as the UHCI controller (see above). The
optionsX parameter is also available on xHCI. NOTE: port 1 and 2 are USB3
and only support super-speed devices, but port 3 and 4 are USB2 and
support speed settings low, full and high.
Example:
usb_xhci: enabled=1
- pcidev:
- Enables the mapping of a host PCI hardware device within
the PCI subsystem of the Bochs x86 emulator. This feature requires Linux
as a host OS.
Example:
pcidev: vendor=0x1234, device=0x5678 The vendor and device arguments should contain the vendor ID respectively the device ID of the PCI device you want to map within Bochs. The PCI mapping is still very experimental and not maintained yet.
LICENSE
This program is distributed under the terms of the GNU Lesser General Public License as published by the Free Software Foundation. See the LICENSE and COPYING files located in /usr/share/doc/bochs/ for details on the license and the lack of warranty.AVAILABILITY
The latest version of this program can be found at:http://bochs.sourceforge.net/getcurrent.html
SEE ALSO
bochs(1), bochs-dlx(1), bximage(1)
The Bochs IA-32 Emulator site on the World Wide Web:
http://bochs.sourceforge.net
Online Bochs Documentation
http://bochs.sourceforge.net/doc/docbook
AUTHORS
The Bochs emulator was created by Kevin Lawton ([email protected]), and is currently maintained by the members of the Bochs x86 Emulator Project. You can see a current roster of members at:http://bochs.sourceforge.net/getinvolved.html
BUGS
Please report all bugs to the bug tracker on our web site. Just go to http://bochs.sourceforge.net, and click "Bug Reports" on the sidebar under "Feedback". Provide a detailed description of the bug, the version of the program you are running, the operating system you are running the program on and the operating system you are running in the emulator.| 27 Jun 2021 | bochsrc |