23e0242287
Convert the m68k kernel-options.txt file to ReST. The conversion is trivial, as the document is already on a format close enough to ReST. Just some small adjustments were needed in order to make it both good for being parsed while keeping it on a good txt shape. At its new index.rst, let's add a :orphan: while this is not linked to the main index.rst file, in order to avoid build warnings. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
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912 lines
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===================================
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Command Line Options for Linux/m68k
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===================================
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Last Update: 2 May 1999
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Linux/m68k version: 2.2.6
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Author: Roman.Hodek@informatik.uni-erlangen.de (Roman Hodek)
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Update: jds@kom.auc.dk (Jes Sorensen) and faq@linux-m68k.org (Chris Lawrence)
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0) Introduction
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===============
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Often I've been asked which command line options the Linux/m68k
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kernel understands, or how the exact syntax for the ... option is, or
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... about the option ... . I hope, this document supplies all the
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answers...
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Note that some options might be outdated, their descriptions being
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incomplete or missing. Please update the information and send in the
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patches.
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1) Overview of the Kernel's Option Processing
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=============================================
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The kernel knows three kinds of options on its command line:
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1) kernel options
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2) environment settings
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3) arguments for init
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To which of these classes an argument belongs is determined as
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follows: If the option is known to the kernel itself, i.e. if the name
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(the part before the '=') or, in some cases, the whole argument string
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is known to the kernel, it belongs to class 1. Otherwise, if the
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argument contains an '=', it is of class 2, and the definition is put
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into init's environment. All other arguments are passed to init as
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command line options.
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This document describes the valid kernel options for Linux/m68k in
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the version mentioned at the start of this file. Later revisions may
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add new such options, and some may be missing in older versions.
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In general, the value (the part after the '=') of an option is a
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list of values separated by commas. The interpretation of these values
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is up to the driver that "owns" the option. This association of
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options with drivers is also the reason that some are further
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subdivided.
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2) General Kernel Options
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=========================
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2.1) root=
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----------
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:Syntax: root=/dev/<device>
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:or: root=<hex_number>
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This tells the kernel which device it should mount as the root
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filesystem. The device must be a block device with a valid filesystem
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on it.
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The first syntax gives the device by name. These names are converted
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into a major/minor number internally in the kernel in an unusual way.
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Normally, this "conversion" is done by the device files in /dev, but
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this isn't possible here, because the root filesystem (with /dev)
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isn't mounted yet... So the kernel parses the name itself, with some
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hardcoded name to number mappings. The name must always be a
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combination of two or three letters, followed by a decimal number.
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Valid names are::
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/dev/ram: -> 0x0100 (initial ramdisk)
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/dev/hda: -> 0x0300 (first IDE disk)
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/dev/hdb: -> 0x0340 (second IDE disk)
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/dev/sda: -> 0x0800 (first SCSI disk)
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/dev/sdb: -> 0x0810 (second SCSI disk)
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/dev/sdc: -> 0x0820 (third SCSI disk)
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/dev/sdd: -> 0x0830 (forth SCSI disk)
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/dev/sde: -> 0x0840 (fifth SCSI disk)
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/dev/fd : -> 0x0200 (floppy disk)
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The name must be followed by a decimal number, that stands for the
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partition number. Internally, the value of the number is just
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added to the device number mentioned in the table above. The
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exceptions are /dev/ram and /dev/fd, where /dev/ram refers to an
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initial ramdisk loaded by your bootstrap program (please consult the
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instructions for your bootstrap program to find out how to load an
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initial ramdisk). As of kernel version 2.0.18 you must specify
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/dev/ram as the root device if you want to boot from an initial
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ramdisk. For the floppy devices, /dev/fd, the number stands for the
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floppy drive number (there are no partitions on floppy disks). I.e.,
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/dev/fd0 stands for the first drive, /dev/fd1 for the second, and so
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on. Since the number is just added, you can also force the disk format
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by adding a number greater than 3. If you look into your /dev
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directory, use can see the /dev/fd0D720 has major 2 and minor 16. You
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can specify this device for the root FS by writing "root=/dev/fd16" on
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the kernel command line.
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[Strange and maybe uninteresting stuff ON]
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This unusual translation of device names has some strange
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consequences: If, for example, you have a symbolic link from /dev/fd
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to /dev/fd0D720 as an abbreviation for floppy driver #0 in DD format,
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you cannot use this name for specifying the root device, because the
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kernel cannot see this symlink before mounting the root FS and it
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isn't in the table above. If you use it, the root device will not be
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set at all, without an error message. Another example: You cannot use a
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partition on e.g. the sixth SCSI disk as the root filesystem, if you
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want to specify it by name. This is, because only the devices up to
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/dev/sde are in the table above, but not /dev/sdf. Although, you can
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use the sixth SCSI disk for the root FS, but you have to specify the
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device by number... (see below). Or, even more strange, you can use the
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fact that there is no range checking of the partition number, and your
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knowledge that each disk uses 16 minors, and write "root=/dev/sde17"
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(for /dev/sdf1).
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[Strange and maybe uninteresting stuff OFF]
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If the device containing your root partition isn't in the table
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above, you can also specify it by major and minor numbers. These are
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written in hex, with no prefix and no separator between. E.g., if you
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have a CD with contents appropriate as a root filesystem in the first
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SCSI CD-ROM drive, you boot from it by "root=0b00". Here, hex "0b" =
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decimal 11 is the major of SCSI CD-ROMs, and the minor 0 stands for
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the first of these. You can find out all valid major numbers by
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looking into include/linux/major.h.
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In addition to major and minor numbers, if the device containing your
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root partition uses a partition table format with unique partition
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identifiers, then you may use them. For instance,
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"root=PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF". It is also
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possible to reference another partition on the same device using a
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known partition UUID as the starting point. For example,
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if partition 5 of the device has the UUID of
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00112233-4455-6677-8899-AABBCCDDEEFF then partition 3 may be found as
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follows:
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PARTUUID=00112233-4455-6677-8899-AABBCCDDEEFF/PARTNROFF=-2
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Authoritative information can be found in
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"Documentation/admin-guide/kernel-parameters.rst".
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2.2) ro, rw
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-----------
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:Syntax: ro
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:or: rw
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These two options tell the kernel whether it should mount the root
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filesystem read-only or read-write. The default is read-only, except
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for ramdisks, which default to read-write.
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2.3) debug
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----------
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:Syntax: debug
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This raises the kernel log level to 10 (the default is 7). This is the
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same level as set by the "dmesg" command, just that the maximum level
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selectable by dmesg is 8.
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2.4) debug=
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-----------
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:Syntax: debug=<device>
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This option causes certain kernel messages be printed to the selected
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debugging device. This can aid debugging the kernel, since the
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messages can be captured and analyzed on some other machine. Which
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devices are possible depends on the machine type. There are no checks
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for the validity of the device name. If the device isn't implemented,
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nothing happens.
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Messages logged this way are in general stack dumps after kernel
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memory faults or bad kernel traps, and kernel panics. To be exact: all
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messages of level 0 (panic messages) and all messages printed while
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the log level is 8 or more (their level doesn't matter). Before stack
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dumps, the kernel sets the log level to 10 automatically. A level of
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at least 8 can also be set by the "debug" command line option (see
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2.3) and at run time with "dmesg -n 8".
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Devices possible for Amiga:
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- "ser":
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built-in serial port; parameters: 9600bps, 8N1
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- "mem":
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Save the messages to a reserved area in chip mem. After
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rebooting, they can be read under AmigaOS with the tool
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'dmesg'.
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Devices possible for Atari:
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- "ser1":
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ST-MFP serial port ("Modem1"); parameters: 9600bps, 8N1
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- "ser2":
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SCC channel B serial port ("Modem2"); parameters: 9600bps, 8N1
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- "ser" :
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default serial port
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This is "ser2" for a Falcon, and "ser1" for any other machine
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- "midi":
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The MIDI port; parameters: 31250bps, 8N1
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- "par" :
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parallel port
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The printing routine for this implements a timeout for the
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case there's no printer connected (else the kernel would
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lock up). The timeout is not exact, but usually a few
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seconds.
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2.6) ramdisk_size=
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------------------
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:Syntax: ramdisk_size=<size>
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This option instructs the kernel to set up a ramdisk of the given
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size in KBytes. Do not use this option if the ramdisk contents are
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passed by bootstrap! In this case, the size is selected automatically
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and should not be overwritten.
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The only application is for root filesystems on floppy disks, that
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should be loaded into memory. To do that, select the corresponding
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size of the disk as ramdisk size, and set the root device to the disk
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drive (with "root=").
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2.7) swap=
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I can't find any sign of this option in 2.2.6.
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2.8) buff=
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-----------
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I can't find any sign of this option in 2.2.6.
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3) General Device Options (Amiga and Atari)
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===========================================
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3.1) ether=
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-----------
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:Syntax: ether=[<irq>[,<base_addr>[,<mem_start>[,<mem_end>]]]],<dev-name>
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<dev-name> is the name of a net driver, as specified in
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drivers/net/Space.c in the Linux source. Most prominent are eth0, ...
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eth3, sl0, ... sl3, ppp0, ..., ppp3, dummy, and lo.
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The non-ethernet drivers (sl, ppp, dummy, lo) obviously ignore the
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settings by this options. Also, the existing ethernet drivers for
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Linux/m68k (ariadne, a2065, hydra) don't use them because Zorro boards
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are really Plug-'n-Play, so the "ether=" option is useless altogether
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for Linux/m68k.
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3.2) hd=
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--------
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:Syntax: hd=<cylinders>,<heads>,<sectors>
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This option sets the disk geometry of an IDE disk. The first hd=
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option is for the first IDE disk, the second for the second one.
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(I.e., you can give this option twice.) In most cases, you won't have
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to use this option, since the kernel can obtain the geometry data
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itself. It exists just for the case that this fails for one of your
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disks.
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3.3) max_scsi_luns=
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-------------------
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:Syntax: max_scsi_luns=<n>
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Sets the maximum number of LUNs (logical units) of SCSI devices to
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be scanned. Valid values for <n> are between 1 and 8. Default is 8 if
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"Probe all LUNs on each SCSI device" was selected during the kernel
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configuration, else 1.
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3.4) st=
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--------
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:Syntax: st=<buffer_size>,[<write_thres>,[<max_buffers>]]
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Sets several parameters of the SCSI tape driver. <buffer_size> is
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the number of 512-byte buffers reserved for tape operations for each
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device. <write_thres> sets the number of blocks which must be filled
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to start an actual write operation to the tape. Maximum value is the
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total number of buffers. <max_buffer> limits the total number of
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buffers allocated for all tape devices.
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3.5) dmasound=
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--------------
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:Syntax: dmasound=[<buffers>,<buffer-size>[,<catch-radius>]]
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This option controls some configurations of the Linux/m68k DMA sound
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driver (Amiga and Atari): <buffers> is the number of buffers you want
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to use (minimum 4, default 4), <buffer-size> is the size of each
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buffer in kilobytes (minimum 4, default 32) and <catch-radius> says
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how much percent of error will be tolerated when setting a frequency
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(maximum 10, default 0). For example with 3% you can play 8000Hz
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AU-Files on the Falcon with its hardware frequency of 8195Hz and thus
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don't need to expand the sound.
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4) Options for Atari Only
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=========================
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4.1) video=
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-----------
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:Syntax: video=<fbname>:<sub-options...>
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The <fbname> parameter specifies the name of the frame buffer,
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eg. most atari users will want to specify `atafb` here. The
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<sub-options> is a comma-separated list of the sub-options listed
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below.
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NB:
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Please notice that this option was renamed from `atavideo` to
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`video` during the development of the 1.3.x kernels, thus you
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might need to update your boot-scripts if upgrading to 2.x from
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an 1.2.x kernel.
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NBB:
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The behavior of video= was changed in 2.1.57 so the recommended
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option is to specify the name of the frame buffer.
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4.1.1) Video Mode
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-----------------
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This sub-option may be any of the predefined video modes, as listed
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in atari/atafb.c in the Linux/m68k source tree. The kernel will
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activate the given video mode at boot time and make it the default
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mode, if the hardware allows. Currently defined names are:
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- stlow : 320x200x4
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- stmid, default5 : 640x200x2
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- sthigh, default4: 640x400x1
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- ttlow : 320x480x8, TT only
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- ttmid, default1 : 640x480x4, TT only
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- tthigh, default2: 1280x960x1, TT only
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- vga2 : 640x480x1, Falcon only
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- vga4 : 640x480x2, Falcon only
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- vga16, default3 : 640x480x4, Falcon only
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- vga256 : 640x480x8, Falcon only
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- falh2 : 896x608x1, Falcon only
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- falh16 : 896x608x4, Falcon only
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If no video mode is given on the command line, the kernel tries the
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modes names "default<n>" in turn, until one is possible with the
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hardware in use.
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A video mode setting doesn't make sense, if the external driver is
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activated by a "external:" sub-option.
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4.1.2) inverse
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--------------
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Invert the display. This affects both, text (consoles) and graphics
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(X) display. Usually, the background is chosen to be black. With this
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option, you can make the background white.
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4.1.3) font
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-----------
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:Syntax: font:<fontname>
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Specify the font to use in text modes. Currently you can choose only
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between `VGA8x8`, `VGA8x16` and `PEARL8x8`. `VGA8x8` is default, if the
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vertical size of the display is less than 400 pixel rows. Otherwise, the
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`VGA8x16` font is the default.
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4.1.4) `hwscroll_`
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------------------
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:Syntax: `hwscroll_<n>`
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The number of additional lines of video memory to reserve for
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speeding up the scrolling ("hardware scrolling"). Hardware scrolling
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is possible only if the kernel can set the video base address in steps
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fine enough. This is true for STE, MegaSTE, TT, and Falcon. It is not
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possible with plain STs and graphics cards (The former because the
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base address must be on a 256 byte boundary there, the latter because
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the kernel doesn't know how to set the base address at all.)
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By default, <n> is set to the number of visible text lines on the
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display. Thus, the amount of video memory is doubled, compared to no
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hardware scrolling. You can turn off the hardware scrolling altogether
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by setting <n> to 0.
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4.1.5) internal:
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----------------
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:Syntax: internal:<xres>;<yres>[;<xres_max>;<yres_max>;<offset>]
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This option specifies the capabilities of some extended internal video
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hardware, like e.g. OverScan. <xres> and <yres> give the (extended)
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dimensions of the screen.
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If your OverScan needs a black border, you have to write the last
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three arguments of the "internal:". <xres_max> is the maximum line
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length the hardware allows, <yres_max> the maximum number of lines.
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<offset> is the offset of the visible part of the screen memory to its
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physical start, in bytes.
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Often, extended interval video hardware has to be activated somehow.
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For this, see the "sw_*" options below.
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4.1.6) external:
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----------------
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:Syntax:
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external:<xres>;<yres>;<depth>;<org>;<scrmem>[;<scrlen>[;<vgabase>
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[;<colw>[;<coltype>[;<xres_virtual>]]]]]
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.. I had to break this line...
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This is probably the most complicated parameter... It specifies that
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you have some external video hardware (a graphics board), and how to
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use it under Linux/m68k. The kernel cannot know more about the hardware
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than you tell it here! The kernel also is unable to set or change any
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video modes, since it doesn't know about any board internal. So, you
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have to switch to that video mode before you start Linux, and cannot
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switch to another mode once Linux has started.
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The first 3 parameters of this sub-option should be obvious: <xres>,
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<yres> and <depth> give the dimensions of the screen and the number of
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planes (depth). The depth is the logarithm to base 2 of the number
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of colors possible. (Or, the other way round: The number of colors is
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2^depth).
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You have to tell the kernel furthermore how the video memory is
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organized. This is done by a letter as <org> parameter:
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'n':
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"normal planes", i.e. one whole plane after another
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'i':
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"interleaved planes", i.e. 16 bit of the first plane, than 16 bit
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of the next, and so on... This mode is used only with the
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built-in Atari video modes, I think there is no card that
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supports this mode.
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'p':
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"packed pixels", i.e. <depth> consecutive bits stand for all
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planes of one pixel; this is the most common mode for 8 planes
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(256 colors) on graphic cards
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't':
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"true color" (more or less packed pixels, but without a color
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lookup table); usually depth is 24
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For monochrome modes (i.e., <depth> is 1), the <org> letter has a
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different meaning:
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'n':
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normal colors, i.e. 0=white, 1=black
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'i':
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inverted colors, i.e. 0=black, 1=white
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The next important information about the video hardware is the base
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address of the video memory. That is given in the <scrmem> parameter,
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as a hexadecimal number with a "0x" prefix. You have to find out this
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address in the documentation of your hardware.
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The next parameter, <scrlen>, tells the kernel about the size of the
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video memory. If it's missing, the size is calculated from <xres>,
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<yres>, and <depth>. For now, it is not useful to write a value here.
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It would be used only for hardware scrolling (which isn't possible
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with the external driver, because the kernel cannot set the video base
|
|
address), or for virtual resolutions under X (which the X server
|
|
doesn't support yet). So, it's currently best to leave this field
|
|
empty, either by ending the "external:" after the video address or by
|
|
writing two consecutive semicolons, if you want to give a <vgabase>
|
|
(it is allowed to leave this parameter empty).
|
|
|
|
The <vgabase> parameter is optional. If it is not given, the kernel
|
|
cannot read or write any color registers of the video hardware, and
|
|
thus you have to set appropriate colors before you start Linux. But if
|
|
your card is somehow VGA compatible, you can tell the kernel the base
|
|
address of the VGA register set, so it can change the color lookup
|
|
table. You have to look up this address in your board's documentation.
|
|
To avoid misunderstandings: <vgabase> is the _base_ address, i.e. a 4k
|
|
aligned address. For read/writing the color registers, the kernel
|
|
uses the addresses vgabase+0x3c7...vgabase+0x3c9. The <vgabase>
|
|
parameter is written in hexadecimal with a "0x" prefix, just as
|
|
<scrmem>.
|
|
|
|
<colw> is meaningful only if <vgabase> is specified. It tells the
|
|
kernel how wide each of the color register is, i.e. the number of bits
|
|
per single color (red/green/blue). Default is 6, another quite usual
|
|
value is 8.
|
|
|
|
Also <coltype> is used together with <vgabase>. It tells the kernel
|
|
about the color register model of your gfx board. Currently, the types
|
|
"vga" (which is also the default) and "mv300" (SANG MV300) are
|
|
implemented.
|
|
|
|
Parameter <xres_virtual> is required for ProMST or ET4000 cards where
|
|
the physical linelength differs from the visible length. With ProMST,
|
|
xres_virtual must be set to 2048. For ET4000, xres_virtual depends on the
|
|
initialisation of the video-card.
|
|
If you're missing a corresponding yres_virtual: the external part is legacy,
|
|
therefore we don't support hardware-dependent functions like hardware-scroll,
|
|
panning or blanking.
|
|
|
|
4.1.7) eclock:
|
|
--------------
|
|
|
|
The external pixel clock attached to the Falcon VIDEL shifter. This
|
|
currently works only with the ScreenWonder!
|
|
|
|
4.1.8) monitorcap:
|
|
-------------------
|
|
|
|
:Syntax: monitorcap:<vmin>;<vmax>;<hmin>;<hmax>
|
|
|
|
This describes the capabilities of a multisync monitor. Don't use it
|
|
with a fixed-frequency monitor! For now, only the Falcon 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 58;62;31;32 (VGA compatible).
|
|
|
|
The defaults for TV/SC1224/SC1435 cover both PAL and NTSC standards.
|
|
|
|
4.1.9) keep
|
|
------------
|
|
|
|
If this option is given, the framebuffer device doesn't do any video
|
|
mode calculations and settings on its own. The only Atari fb device
|
|
that does this currently is the Falcon.
|
|
|
|
What you reach with this: Settings for unknown video extensions
|
|
aren't overridden by the driver, so you can still use the mode found
|
|
when booting, when the driver doesn't know to set this mode itself.
|
|
But this also means, that you can't switch video modes anymore...
|
|
|
|
An example where you may want to use "keep" is the ScreenBlaster for
|
|
the Falcon.
|
|
|
|
|
|
4.2) atamouse=
|
|
--------------
|
|
|
|
:Syntax: atamouse=<x-threshold>,[<y-threshold>]
|
|
|
|
With this option, you can set the mouse movement reporting threshold.
|
|
This is the number of pixels of mouse movement that have to accumulate
|
|
before the IKBD sends a new mouse packet to the kernel. Higher values
|
|
reduce the mouse interrupt load and thus reduce the chance of keyboard
|
|
overruns. Lower values give a slightly faster mouse responses and
|
|
slightly better mouse tracking.
|
|
|
|
You can set the threshold in x and y separately, but usually this is
|
|
of little practical use. If there's just one number in the option, it
|
|
is used for both dimensions. The default value is 2 for both
|
|
thresholds.
|
|
|
|
|
|
4.3) ataflop=
|
|
-------------
|
|
|
|
:Syntax: ataflop=<drive type>[,<trackbuffering>[,<steprateA>[,<steprateB>]]]
|
|
|
|
The drive type may be 0, 1, or 2, for DD, HD, and ED, resp. This
|
|
setting affects how many buffers are reserved and which formats are
|
|
probed (see also below). The default is 1 (HD). Only one drive type
|
|
can be selected. If you have two disk drives, select the "better"
|
|
type.
|
|
|
|
The second parameter <trackbuffer> tells the kernel whether to use
|
|
track buffering (1) or not (0). The default is machine-dependent:
|
|
no for the Medusa and yes for all others.
|
|
|
|
With the two following parameters, you can change the default
|
|
steprate used for drive A and B, resp.
|
|
|
|
|
|
4.4) atascsi=
|
|
-------------
|
|
|
|
:Syntax: atascsi=<can_queue>[,<cmd_per_lun>[,<scat-gat>[,<host-id>[,<tagged>]]]]
|
|
|
|
This option sets some parameters for the Atari native SCSI driver.
|
|
Generally, any number of arguments can be omitted from the end. And
|
|
for each of the numbers, a negative value means "use default". The
|
|
defaults depend on whether TT-style or Falcon-style SCSI is used.
|
|
Below, defaults are noted as n/m, where the first value refers to
|
|
TT-SCSI and the latter to Falcon-SCSI. If an illegal value is given
|
|
for one parameter, an error message is printed and that one setting is
|
|
ignored (others aren't affected).
|
|
|
|
<can_queue>:
|
|
This is the maximum number of SCSI commands queued internally to the
|
|
Atari SCSI driver. A value of 1 effectively turns off the driver
|
|
internal multitasking (if it causes problems). Legal values are >=
|
|
1. <can_queue> can be as high as you like, but values greater than
|
|
<cmd_per_lun> times the number of SCSI targets (LUNs) you have
|
|
don't make sense. Default: 16/8.
|
|
|
|
<cmd_per_lun>:
|
|
Maximum number of SCSI commands issued to the driver for one
|
|
logical unit (LUN, usually one SCSI target). Legal values start
|
|
from 1. If tagged queuing (see below) is not used, values greater
|
|
than 2 don't make sense, but waste memory. Otherwise, the maximum
|
|
is the number of command tags available to the driver (currently
|
|
32). Default: 8/1. (Note: Values > 1 seem to cause problems on a
|
|
Falcon, cause not yet known.)
|
|
|
|
The <cmd_per_lun> value at a great part determines the amount of
|
|
memory SCSI reserves for itself. The formula is rather
|
|
complicated, but I can give you some hints:
|
|
|
|
no scatter-gather:
|
|
cmd_per_lun * 232 bytes
|
|
full scatter-gather:
|
|
cmd_per_lun * approx. 17 Kbytes
|
|
|
|
<scat-gat>:
|
|
Size of the scatter-gather table, i.e. the number of requests
|
|
consecutive on the disk that can be merged into one SCSI command.
|
|
Legal values are between 0 and 255. Default: 255/0. Note: This
|
|
value is forced to 0 on a Falcon, since scatter-gather isn't
|
|
possible with the ST-DMA. Not using scatter-gather hurts
|
|
performance significantly.
|
|
|
|
<host-id>:
|
|
The SCSI ID to be used by the initiator (your Atari). This is
|
|
usually 7, the highest possible ID. Every ID on the SCSI bus must
|
|
be unique. Default: determined at run time: If the NV-RAM checksum
|
|
is valid, and bit 7 in byte 30 of the NV-RAM is set, the lower 3
|
|
bits of this byte are used as the host ID. (This method is defined
|
|
by Atari and also used by some TOS HD drivers.) If the above
|
|
isn't given, the default ID is 7. (both, TT and Falcon).
|
|
|
|
<tagged>:
|
|
0 means turn off tagged queuing support, all other values > 0 mean
|
|
use tagged queuing for targets that support it. Default: currently
|
|
off, but this may change when tagged queuing handling has been
|
|
proved to be reliable.
|
|
|
|
Tagged queuing means that more than one command can be issued to
|
|
one LUN, and the SCSI device itself orders the requests so they
|
|
can be performed in optimal order. Not all SCSI devices support
|
|
tagged queuing (:-().
|
|
|
|
4.5 switches=
|
|
-------------
|
|
|
|
:Syntax: switches=<list of switches>
|
|
|
|
With this option you can switch some hardware lines that are often
|
|
used to enable/disable certain hardware extensions. Examples are
|
|
OverScan, overclocking, ...
|
|
|
|
The <list of switches> is a comma-separated list of the following
|
|
items:
|
|
|
|
ikbd:
|
|
set RTS of the keyboard ACIA high
|
|
midi:
|
|
set RTS of the MIDI ACIA high
|
|
snd6:
|
|
set bit 6 of the PSG port A
|
|
snd7:
|
|
set bit 6 of the PSG port A
|
|
|
|
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.
|
|
|
|
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.
|