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24 1) Overview of the Kernel's Option Processing
27 The kernel knows three kinds of options on its command line:
33 To which of these classes an argument belongs is determined as
37 argument contains an '=', it is of class 2, and the definition is put
42 the version mentioned at the start of this file. Later revisions may
45 In general, the value (the part after the '=') of an option is a
46 list of values separated by commas. The interpretation of these values
47 is up to the driver that "owns" the option. This association of
71 combination of two or three letters, followed by a decimal number.
94 partition number. Internally, the value of the number is just
99 initial ramdisk). As of kernel version 2.0.18 you must specify
112 This unusual translation of device names has some strange
124 fact that there is no range checking of the partition number, and your
135 decimal 11 is the major of SCSI CD-ROMs, and the minor 0 stands for
136 the first of these. You can find out all valid major numbers by
170 for the validity of the device name. If the device isn't implemented,
175 messages of level 0 (panic messages) and all messages printed while
177 dumps, the kernel sets the log level to 10 automatically. A level of
207 This option instructs the kernel to set up a ramdisk of the given
214 size of the disk as ramdisk size, and set the root device to the disk
222 I can't find any sign of these options in 2.2.6.
233 <dev-name> is the name of a net driver, as specified in
249 This option sets the disk geometry of an IDE disk. The first hd=
253 itself. It exists just for the case that this fails for one of your
262 Sets the maximum number of LUNs (logical units) of SCSI devices to
273 Sets several parameters of the SCSI tape driver. <buffer_size> is
274 the number of 512-byte buffers reserved for tape operations for each
275 device. <write_thres> sets the number of blocks which must be filled
277 total number of buffers. <max_buffer> limits the total number of
286 This option controls some configurations of the Linux/m68k DMA sound
287 driver (Amiga and Atari): <buffers> is the number of buffers you want
288 to use (minimum 4, default 4), <buffer-size> is the size of each
290 how much percent of error will be tolerated when setting a frequency
292 AU-Files on the Falcon with its hardware frequency of 8195Hz and thus
305 The <fbname> parameter specifies the name of the frame buffer,
307 <sub-options> is a comma-separated list of the sub-options listed
311 `video' during the development of the 1.3.x kernels, thus you
315 NBB: The behavior of video= was changed in 2.1.57 so the recommended
316 option is to specify the name of the frame buffer.
321 This sub-option may be any of the predefined video modes, as listed
360 vertical size of the display is less than 400 pixel rows. Otherwise, the
368 The number of additional lines of video memory to reserve for
376 By default, <n> is set to the number of visible text lines on the
377 display. Thus, the amount of video memory is doubled, compared to no
386 This option specifies the capabilities of some extended internal video
388 dimensions of the screen.
391 three arguments of the "internal:". <xres_max> is the maximum line
392 length the hardware allows, <yres_max> the maximum number of lines.
393 <offset> is the offset of the visible part of the screen memory to its
416 The first 3 parameters of this sub-option should be obvious: <xres>,
417 <yres> and <depth> give the dimensions of the screen and the number of
418 planes (depth). The depth is is the logarithm to base 2 of the number
419 of colors possible. (Or, the other way round: The number of colors is
426 'i': "interleaved planes", i.e. 16 bit of the first plane, than 16 bit
427 of the next, and so on... This mode is used only with the
431 planes of one pixel; this is the most common mode for 8 planes
443 address of the video memory. That is given in the <scrmem> parameter,
445 address in the documentation of your hardware.
447 The next parameter, <scrlen>, tells the kernel about the size of the
459 cannot read or write any color registers of the video hardware, and
462 address of the VGA register set, so it can change the color lookup
471 kernel how wide each of the color register is, i.e. the number of bits
476 about the color register model of your gfx board. Currently, the types
483 initialisation of the video-card.
499 This describes the capabilities of a multisync monitor. Don't use it
501 uses the settings of "monitorcap:".
533 This is the number of pixels of mouse movement that have to accumulate
535 reduce the mouse interrupt load and thus reduce the chance of keyboard
540 of little practical use. If there's just one number in the option, it
570 Generally, any number of arguments can be omitted from the end. And
571 for each of the numbers, a negative value means "use default". The
579 This is the maximum number of SCSI commands queued internally to the
580 Atari SCSI driver. A value of 1 effectively turns off the driver
583 <cmd_per_lun> times the number of SCSI targets (LUNs) you have
587 Maximum number of SCSI commands issued to the driver for one
591 is the number of command tags available to the driver (currently
595 The <cmd_per_lun> value at a great part determines the amount of
602 Size of the scatter-gather table, i.e. the number of requests
613 is valid, and bit 7 in byte 30 of the NV-RAM is set, the lower 3
614 bits of this byte are used as the host ID. (This method is defined
632 Syntax: switches=<list of switches>
638 The <list of switches> is a comma-separated list of the following
641 ikbd: set RTS of the keyboard ACIA high
642 midi: set RTS of the MIDI ACIA high
643 snd6: set bit 6 of the PSG port A
644 snd7: set bit 6 of the PSG port A
652 All of the items can also be prefixed with "ov_", i.e. "ov_ikbd",
672 the fraction of ST-RAM must be less or equal 1/3 of total memory to
676 ST-RAM, even if it's small enough compared to the rest of memory.
682 you want to use parts of ST-RAM as normal system memory. <max_swap> is
683 in kBytes and the number should be a multiple of 4 (otherwise: rounded
694 The <fbname> parameter specifies the name of the frame buffer, valid
697 kernel (or compiled as loadable modules). The behavior of the <fbname>
701 The <sub-options> is a comma-separated list of the sub-options listed
702 below. This option is organized similar to the Atari version of the
746 Syntax: depth:<nr. of bit-planes>
748 Specify the number of bit-planes for the selected video-mode.
763 of `VGA8x8' if the vertical size of the display is less than 400 pixel
771 This describes the capabilities of a multisync monitor. For now, only
772 the color frame buffer uses the settings of "monitorcap:".
798 The <sub-options> is a comma-separated list of the sub-options listed
818 `ns' is the minimum # of nanoseconds in a SCSI data transfer
836 types of debug output to printed - see the DB_xxx defines in
854 No argument. Used to separate blocks of keywords when there's more
875 The earlier versions of the GVP driver did not handle DMA
879 use of this option is now highly unrecommended!
892 Some versions of the GVP can only DMA into a 24 bit address range,
896 24 bit region which is specified by a mask of 0x00fffffe.
908 The <sub-options> is a comma-separated list of the sub-options listed
958 No argument. Used to separate blocks of keywords when there's more