kernel-options.txt

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It doesn't make sense to mention a switch more than once (no
difference to only once), but you can give as many switches as you
want to enable different features. The switch lines are set as early
as possible during kernel initialization (even before determining the
present hardware.)

  All of the items can also be prefixed with "ov_", i.e. "ov_ikbd",
"ov_midi", ... These options are meant for switching on an OverScan
video extension. The difference to the bare option is that the
switch-on is done after video initialization, and somehow synchronized
to the HBLANK. A speciality is that ov_ikbd and ov_midi are switched
off before rebooting, so that OverScan is disabled and TOS boots
correctly.

  If you give an option both, with and without the "ov_" prefix, the
earlier initialization ("ov_"-less) takes precedence. But the
switching-off on reset still happens in this case.

4.5) stram_swap=
----------------

Syntax: stram_swap=<do_swap>[,<max_swap>]

  This option is available only if the kernel has been compiled with
CONFIG_STRAM_SWAP enabled. Normally, the kernel then determines
dynamically whether to actually use ST-RAM as swap space. (Currently,
the fraction of ST-RAM must be less or equal 1/3 of total memory to
enable this swapping.) You can override the kernel's decision by
specifying this option. 1 for <do_swap> means always enable the swap,
even if you have less alternate RAM. 0 stands for never swap to
ST-RAM, even if it's small enough compared to the rest of memory.

  If ST-RAM swapping is enabled, the kernel usually uses all free
ST-RAM as swap "device". If the kernel resides in ST-RAM, the region
allocated by it is obviously never used for swapping :-) You can also
limit this amount by specifying the second parameter, <max_swap>, if
you want to use parts of ST-RAM as normal system memory. <max_swap> is
in kBytes and the number should be a multiple of 4 (otherwise: rounded
down).

5) Options for Amiga Only:
==========================

5.1) video=
-----------

Syntax: video=<fbname>:<sub-options...>

The <fbname> parameter specifies the name of the frame buffer, valid
options are `amifb', `cyber', 'virge', `retz3' and `clgen', provided
that the respective frame buffer devices have been compiled into the
kernel (or compiled as loadable modules). The behavior of the <fbname>
option was changed in 2.1.57 so it is now recommended to specify this
option.

The <sub-options> is a comma-separated list of the sub-options listed
below. This option is organized similar to the Atari version of the
"video"-option (4.1), but knows fewer sub-options.

5.1.1) video mode
-----------------

Again, similar to the video mode for the Atari (see 4.1.1). Predefined
modes depend on the used frame buffer device.

OCS, ECS and AGA machines all use the color frame buffer. The following
predefined video modes are available:

NTSC modes:
 - ntsc            : 640x200, 15 kHz, 60 Hz
 - ntsc-lace       : 640x400, 15 kHz, 60 Hz interlaced
PAL modes:
 - pal             : 640x256, 15 kHz, 50 Hz
 - pal-lace        : 640x512, 15 kHz, 50 Hz interlaced
ECS modes:
 - multiscan       : 640x480, 29 kHz, 57 Hz
 - multiscan-lace  : 640x960, 29 kHz, 57 Hz interlaced
 - euro36          : 640x200, 15 kHz, 72 Hz
 - euro36-lace     : 640x400, 15 kHz, 72 Hz interlaced
 - euro72          : 640x400, 29 kHz, 68 Hz
 - euro72-lace     : 640x800, 29 kHz, 68 Hz interlaced
 - super72         : 800x300, 23 kHz, 70 Hz
 - super72-lace    : 800x600, 23 kHz, 70 Hz interlaced
 - dblntsc-ff      : 640x400, 27 kHz, 57 Hz
 - dblntsc-lace    : 640x800, 27 kHz, 57 Hz interlaced
 - dblpal-ff       : 640x512, 27 kHz, 47 Hz
 - dblpal-lace     : 640x1024, 27 kHz, 47 Hz interlaced
 - dblntsc         : 640x200, 27 kHz, 57 Hz doublescan
 - dblpal          : 640x256, 27 kHz, 47 Hz doublescan
VGA modes:
 - vga             : 640x480, 31 kHz, 60 Hz
 - vga70           : 640x400, 31 kHz, 70 Hz

Please notice that the ECS and VGA modes require either an ECS or AGA
chipset, and that these modes are limited to 2-bit color for the ECS
chipset and 8-bit color for the AGA chipset.

5.1.2) depth
------------

Syntax: depth:<nr. of bit-planes>

Specify the number of bit-planes for the selected video-mode.

5.1.3) inverse
--------------

Use inverted display (black on white). Functionally the same as the
"inverse" sub-option for the Atari.

5.1.4) font
-----------

Syntax: font:<fontname>

Specify the font to use in text modes. Functionally the same as the
"font" sub-option for the Atari, except that `PEARL8x8' is used instead
of `VGA8x8' if the vertical size of the display is less than 400 pixel
rows.

5.1.5) monitorcap:
-------------------

Syntax: monitorcap:<vmin>;<vmax>;<hmin>;<hmax>

This describes the capabilities of a multisync monitor. For now, only
the color frame buffer uses the settings of "monitorcap:".

  <vmin> and <vmax> are the minimum and maximum, resp., vertical frequencies
your monitor can work with, in Hz. <hmin> and <hmax> are the same for
the horizontal frequency, in kHz.

  The defaults are 50;90;15;38 (Generic Amiga multisync monitor).


5.2) fd_def_df0=
----------------

Syntax: fd_def_df0=<value>

Sets the df0 value for "silent" floppy drives. The value should be in
hexadecimal with "0x" prefix.


5.3) wd33c93=
-------------

Syntax: wd33c93=<sub-options...>

These options affect the A590/A2091, A3000 and GVP Series II SCSI
controllers.

The <sub-options> is a comma-separated list of the sub-options listed
below.

5.3.1) nosync
-------------

Syntax: nosync:bitmask

  bitmask is a byte where the 1st 7 bits correspond with the 7
possible SCSI devices. Set a bit to prevent sync negotiation on that
device. To maintain backwards compatibility, a command-line such as
"wd33c93=255" will be automatically translated to
"wd33c93=nosync:0xff". The default is to disable sync negotiation for
all devices, eg. nosync:0xff.

5.3.2) period
-------------

Syntax: period:ns

  `ns' is the minimum # of nanoseconds in a SCSI data transfer
period. Default is 500; acceptable values are 250 - 1000.

5.3.3) disconnect
-----------------

Syntax: disconnect:x

  Specify x = 0 to never allow disconnects, 2 to always allow them.
x = 1 does 'adaptive' disconnects, which is the default and generally
the best choice.

5.3.4) debug
------------

Syntax: debug:x

  If `DEBUGGING_ON' is defined, x is a bit mask that causes various
types of debug output to printed - see the DB_xxx defines in
wd33c93.h.

5.3.5) clock
------------

Syntax: clock:x

  x = clock input in MHz for WD33c93 chip. Normal values would be from
8 through 20. The default value depends on your hostadapter(s),
default for the A3000 internal controller is 14, for the A2091 it's 8
and for the GVP hostadapters it's either 8 or 14, depending on the
hostadapter and the SCSI-clock jumper present on some GVP
hostadapters.

5.3.6) next
-----------

  No argument. Used to separate blocks of keywords when there's more
than one wd33c93-based host adapter in the system.

5.3.7) nodma
------------

Syntax: nodma:x

  If x is 1 (or if the option is just written as "nodma"), the WD33c93
controller will not use DMA (= direct memory access) to access the
Amiga's memory.  This is useful for some systems (like A3000's and
A4000's with the A3640 accelerator, revision 3.0) that have problems
using DMA to chip memory.  The default is 0, i.e. to use DMA if
possible.


5.4) gvp11=
-----------

Syntax: gvp11=<addr-mask>

  The earlier versions of the GVP driver did not handle DMA
address-mask settings correctly which made it necessary for some
people to use this option, in order to get their GVP controller
running under Linux. These problems have hopefully been solved and the
use of this option is now highly unrecommended!

  Incorrect use can lead to unpredictable behavior, so please only use
this option if you *know* what you are doing and have a reason to do
so. In any case if you experience problems and need to use this
option, please inform us about it by mailing to the Linux/68k kernel
mailing list.

  The address mask set by this option specifies which addresses are
valid for DMA with the GVP Series II SCSI controller. An address is
valid, if no bits are set except the bits that are set in the mask,
too.

  Some versions of the GVP can only DMA into a 24 bit address range,
some can address a 25 bit address range while others can use the whole
32 bit address range for DMA. The correct setting depends on your
controller and should be autodetected by the driver. An example is the
24 bit region which is specified by a mask of 0x00fffffe.


5.5) 53c7xx=
------------

Syntax: 53c7xx=<sub-options...>

These options affect the A4000T, A4091, WarpEngine, Blizzard 603e+,
and GForce 040/060 SCSI controllers on the Amiga, as well as the
builtin MVME 16x SCSI controller.

The <sub-options> is a comma-separated list of the sub-options listed
below.

5.5.1) nosync
-------------

Syntax: nosync:0

  Disables sync negotiation for all devices.  Any value after the
  colon is acceptable (and has the same effect).

5.5.2) noasync
--------------

Syntax: noasync:0

  Disables async and sync negotiation for all devices.  Any value
  after the colon is acceptable (and has the same effect).

5.5.3) nodisconnect
-------------------

Syntax: nodisconnect:0

  Disables SCSI disconnects.  Any value after the colon is acceptable
  (and has the same effect).

5.5.4) validids
---------------

Syntax: validids:0xNN

  Specify which SCSI ids the driver should pay attention to.  This is
  a bitmask (i.e. to only pay attention to ID#4, you'd use 0x10).
  Default is 0x7f (devices 0-6).

5.5.5) opthi
5.5.6) optlo
------------

Syntax: opthi:M,optlo:N

  Specify options for "hostdata->options".  The acceptable definitions
  are listed in drivers/scsi/53c7xx.h; the 32 high bits should be in
  opthi and the 32 low bits in optlo.  They must be specified in the
  order opthi=M,optlo=N.

5.5.7) next
-----------

  No argument. Used to separate blocks of keywords when there's more
  than one 53c7xx host adapter in the system.


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