config.help

是关于linux2.5.1的完全源码

CONFIG_ZFTAPE
  Normally, you want to say Y or M. DON'T say N here or you
  WON'T BE ABLE TO USE YOUR FLOPPY TAPE DRIVE.

  The ftape module itself no longer contains the routines necessary
  to interface with the kernel VFS layer (i.e. to actually write data
  to and read data from the tape drive).  Instead the file system
  interface (i.e. the hardware independent part of the driver) has
  been moved to a separate module.

  If you say M zftape will be compiled as a runtime loadable
  module ( = code which can be inserted in and removed from the
  running kernel whenever you want).  In this case you should read
  <file:Documentation/modules.txt>.  The module will be called
  zftape.o.

  Regardless of whether you say Y or M here, an additional runtime
  loadable module called `zft-compressor.o' which contains code to
  support user transparent on-the-fly compression based on Ross
  William's lzrw3 algorithm will be produced.  If you have enabled the
  kernel module loader (i.e. have said Y to "Kernel module loader
  support", above) then `zft-compressor.o' will be loaded
  automatically by zftape when needed.

  Despite its name, zftape does NOT use compression by default.  The
  file <file:Documentation/ftape.txt> contains a short description of
  the most important changes in the file system interface compared to
  previous versions of ftape.  The ftape home page
  <http://www.instmath.rwth-aachen.de/~heine/ftape/> contains
  further information.

  IMPORTANT NOTE: zftape can read archives created by previous
  versions of ftape and provide file mark support (i.e. fast skipping
  between tape archives) but previous version of ftape will lack file
  mark support when reading archives produced by zftape.

CONFIG_ZFT_DFLT_BLK_SZ
  If unsure leave this at its default value, i.e. 10240. Note that
  you specify only the default block size here. The block size can be
  changed at run time using the MTSETBLK tape operation with the
  MTIOCTOP ioctl (i.e. with "mt -f /dev/qft0 setblk #BLKSZ" from the
  shell command line).

  The probably most striking difference between zftape and previous
  versions of ftape is the fact that all data must be written or read
  in multiples of a fixed block size. The block size defaults to
  10240 which is what GNU tar uses. The values for the block size
  should be either 1 or multiples of 1024 up to a maximum value of
  63488 (i.e. 62 K). If you specify `1' then zftape's builtin
  compression will be disabled.

  Reasonable values are `10240' (GNU tar's default block size),
  `5120' (afio's default block size), `32768' (default block size some
  backup programs assume for SCSI tape drives) or `1' (no restriction
  on block size, but disables builtin compression).

CONFIG_FT_NR_BUFFERS
  Please leave this at `3' unless you REALLY know what you are doing.
  It is not necessary to change this value. Values below 3 make the
  proper use of ftape impossible, values greater than 3 are a waste of
  memory. You can change the amount of DMA memory used by ftape at
  runtime with "mt -f /dev/qft0 setdrvbuffer #NUMBUFFERS". Each buffer
  wastes 32 KB of memory. Please note that this memory cannot be
  swapped out.

CONFIG_FT_PROC_FS
  Optional. Saying Y will result in creation of a directory
  `/proc/ftape' under the /proc file system. The files can be viewed
  with your favorite pager (i.e. use "more /proc/ftape/history" or
  "less /proc/ftape/history" or simply "cat /proc/ftape/history"). The
  file will contain some status information about the inserted
  cartridge, the kernel driver, your tape drive, the floppy disk
  controller and the error history for the most recent use of the
  kernel driver. Saying Y will enlarge the size of the ftape driver
  by approximately 2 KB.

  WARNING: When compiling ftape as a module (i.e. saying M to "Floppy
  tape drive") it is dangerous to use ftape's /proc file system
  interface. Accessing `/proc/ftape' while the module is unloaded will
  result in a kernel Oops. This cannot be fixed from inside ftape.

CONFIG_FT_NORMAL_DEBUG
  This option controls the amount of debugging output the ftape driver
  is ABLE to produce; it does not increase or diminish the debugging
  level itself. If unsure, leave this at its default setting,
  i.e. choose "Normal".

  Ftape can print lots of debugging messages to the system console
  resp. kernel log files. Reducing the amount of possible debugging
  output reduces the size of the kernel module by some KB, so it might
  be a good idea to use "None" for emergency boot floppies.

  If you want to save memory then the following strategy is
  recommended: leave this option at its default setting "Normal" until
  you know that the driver works as expected, afterwards reconfigure
  the kernel, this time specifying "Reduced" or "None" and recompile
  and install the kernel as usual. Note that choosing "Excessive"
  debugging output does not increase the amount of debugging output
  printed to the console but only makes it possible to produce
  "Excessive" debugging output.

  Please read <file:Documentation/ftape.txt> for a short description
  how to control the amount of debugging output.

CONFIG_FT_FULL_DEBUG
  Extremely verbose output for driver debugging purposes.

CONFIG_FT_NO_TRACE
  Reduced tape driver debugging output.

CONFIG_FT_NO_TRACE_AT_ALL
  Suppress all debugging output from the tape drive.

CONFIG_FT_STD_FDC
  Only change this setting if you have a special controller. If you
  didn't plug any add-on card into your computer system but just
  plugged the floppy tape cable into the already existing floppy drive
  controller then you don't want to change the default setting,
  i.e. choose "Standard".

  Choose "MACH-2" if you have a Mountain Mach-2 controller.
  Choose "FC-10/FC-20" if you have a Colorado FC-10 or FC-20
  controller.
  Choose "Alt/82078" if you have another controller that is located at
  an IO base address different from the standard floppy drive
  controller's base address of `0x3f0', or uses an IRQ (interrupt)
  channel different from `6', or a DMA channel different from
  `2'. This is necessary for any controller card that is based on
  Intel's 82078 FDC such as Seagate's, Exabyte's and Iomega's "high
  speed" controllers.

  If you choose something other than "Standard" then please make
  sure that the settings for the IO base address and the IRQ and DMA
  channel in the configuration menus below are correct. Use the manual
  of your tape drive to determine the correct settings!

  If you are already successfully using your tape drive with another
  operating system then you definitely should use the same settings
  for the IO base, the IRQ and DMA channel that have proven to work
  with that other OS.

  Note that this menu lets you specify only the default setting for
  the hardware setup. The hardware configuration can be changed at
  boot time (when ftape is compiled into the kernel, i.e. if you
  have said Y to "Floppy tape drive") or module load time (i.e. if you
  have said M to "Floppy tape drive").

  Please read also the file <file:Documentation/ftape.txt> which
  contains a short description of the parameters that can be set at
  boot or load time. If you want to use your floppy tape drive on a
  PCI-bus based system, please read the file
  <file:drivers/char/ftape/README.PCI>.

CONFIG_FT_FDC_BASE
  You don't need to specify a value if the following default
  settings for the base IO address are correct:
  <<< MACH-2     : 0x1E0 >>>
  <<< FC-10/FC-20: 0x180 >>>
  <<< Secondary  : 0x370 >>>
  Secondary refers to a secondary FDC controller like the "high speed"
  controllers delivered by Seagate or Exabyte or Iomega's Ditto Dash.
  Please make sure that the setting for the IO base address
  specified here is correct. USE THE MANUAL OF YOUR TAPE DRIVE OR
  CONTROLLER CARD TO DETERMINE THE CORRECT SETTING. If you are already
  successfully using the tape drive with another operating system then
  you definitely should use the same settings for the IO base that has
  proven to work with that other OS.

  Note that this menu lets you specify only the default setting for
  the IO base. The hardware configuration can be changed at boot time
  (when ftape is compiled into the kernel, i.e. if you specified Y to
  "Floppy tape drive") or module load time (i.e. if you have said M to
  "Floppy tape drive").

  Please read also the file <file:Documentation/ftape.txt> which
  contains a short description of the parameters that can be set at
  boot or load time.

CONFIG_FT_FDC_IRQ
  You don't need to specify a value if the following default
  settings for the interrupt channel are correct:
  <<< MACH-2     : 6 >>>
  <<< FC-10/FC-20: 9 >>>
  <<< Secondary  : 6 >>>
  Secondary refers to secondary a FDC controller like the "high speed"
  controllers delivered by Seagate or Exabyte or Iomega's Ditto Dash.
  Please make sure that the setting for the IO base address
  specified here is correct. USE THE MANUAL OF YOUR TAPE DRIVE OR
  CONTROLLER CARD TO DETERMINE THE CORRECT SETTING. If you are already
  successfully using the tape drive with another operating system then
  you definitely should use the same settings for the IO base that has
  proven to work with that other OS.

  Note that this menu lets you specify only the default setting for
  the IRQ channel. The hardware configuration can be changed at boot
  time (when ftape is compiled into the kernel, i.e. if you said Y to
  "Floppy tape drive") or module load time (i.e. if you said M to
  "Floppy tape drive").

  Please read also the file <file:Documentation/ftape.txt> which
  contains a short description of the parameters that can be set at
  boot or load time.

CONFIG_FT_FDC_DMA
  You don't need to specify a value if the following default
  settings for the DMA channel are correct:
  <<< MACH-2     : 2 >>>
  <<< FC-10/FC-20: 3 >>>
  <<< Secondary  : 2 >>>
  Secondary refers to a secondary FDC controller like the "high speed"
  controllers delivered by Seagate or Exabyte or Iomega's Ditto Dash.
  Please make sure that the setting for the IO base address
  specified here is correct. USE THE MANUAL OF YOUR TAPE DRIVE OR
  CONTROLLER CARD TO DETERMINE THE CORRECT SETTING. If you are already
  successfully using the tape drive with another operating system then
  you definitely should use the same settings for the IO base that has
  proven to work with that other OS.

  Note that this menu lets you specify only the default setting for
  the DMA channel. The hardware configuration can be changed at boot
  time (when ftape is compiled into the kernel, i.e. if you said Y to
  "Floppy tape drive") or module load time (i.e. if you said M to
  "Floppy tape drive").

  Please read also the file <file:Documentation/ftape.txt> which
  contains a short description of the parameters that can be set at
  boot or load time.

CONFIG_FT_FDC_THR
  Set the FIFO threshold of the FDC. If this is higher the DMA
  controller may serve the FDC after a higher latency time. If this is
  lower, fewer DMA transfers occur leading to less bus contention.
  You may try to tune this if ftape annoys you with "reduced data
  rate because of excessive overrun errors" messages. However, this
  doesn't seem to have too much effect.

  If unsure, don't touch the initial value, i.e. leave it at "8".

CONFIG_FT_FDC_MAX_RATE
  With some motherboard/FDC combinations ftape will not be able to
  run your FDC/tape drive combination at the highest available
  speed. If this is the case you'll encounter "reduced data rate
  because of excessive overrun errors" messages and lots of retries
  before ftape finally decides to reduce the data rate.

  In this case it might be desirable to tell ftape beforehand that
  it need not try to run the tape drive at the highest available
  speed. If unsure, leave this disabled, i.e. leave it at 2000
  bits/sec.

CONFIG_FT_ALPHA_CLOCK
  On some DEC Alpha machines the CPU clock frequency cannot be
  determined automatically, so you need to specify it here ONLY if
  running a DEC Alpha, otherwise this setting has no effect.