drivers/block/Kconfig - linux - Git at Google


            
            #

            
            # Block device driver configuration

            
            #


            menu "Block devices"


            config BLK_DEV_FD

            
            	tristate "Normal floppy disk support"

            
            	depends on ARCH_MAY_HAVE_PC_FDC

            
            	---help---

            
            	  If you want to use the floppy disk drive(s) of your PC under Linux,

            
            	  say Y. Information about this driver, especially important for IBM

            
            	  Thinkpad users, is contained in <file:Documentation/floppy.txt>.

            
            	  That file also contains the location of the Floppy driver FAQ as

            
            	  well as location of the fdutils package used to configure additional

            
            	  parameters of the driver at run time.


            	  To compile this driver as a module, choose M here: the

            
            	  module will be called floppy.


            config AMIGA_FLOPPY

            
            	tristate "Amiga floppy support"

            
            	depends on AMIGA


            config ATARI_FLOPPY

            
            	tristate "Atari floppy support"

            
            	depends on ATARI


            config BLK_DEV_SWIM_IOP

            
            	bool "Macintosh IIfx/Quadra 900/Quadra 950 floppy support (EXPERIMENTAL)"

            
            	depends on MAC && EXPERIMENTAL && BROKEN

            
            	help

            
            	  Say Y here to support the SWIM (Super Woz Integrated Machine) IOP

            
            	  floppy controller on the Macintosh IIfx and Quadra 900/950.


            config MAC_FLOPPY

            
            	tristate "Support for PowerMac floppy"

            
            	depends on PPC_PMAC && !PPC_PMAC64

            
            	help

            
            	  If you have a SWIM-3 (Super Woz Integrated Machine 3; from Apple)

            
            	  floppy controller, say Y here. Most commonly found in PowerMacs.


            config BLK_DEV_PS2

            
            	tristate "PS/2 ESDI hard disk support"

            
            	depends on MCA && MCA_LEGACY && BROKEN

            
            	help

            
            	  Say Y here if you have a PS/2 machine with a MCA bus and an ESDI

            
            	  hard disk.


            	  To compile this driver as a module, choose M here: the

            
            	  module will be called ps2esdi.


            config AMIGA_Z2RAM

            
            	tristate "Amiga Zorro II ramdisk support"

            
            	depends on ZORRO

            
            	help

            
            	  This enables support for using Chip RAM and Zorro II RAM as a

            
            	  ramdisk or as a swap partition. Say Y if you want to include this

            
            	  driver in the kernel.


            	  To compile this driver as a module, choose M here: the

            
            	  module will be called z2ram.


            config ATARI_ACSI

            
            	tristate "Atari ACSI support"

            
            	depends on ATARI && BROKEN

            
            	---help---

            
            	  This enables support for the Atari ACSI interface. The driver

            
            	  supports hard disks and CD-ROMs, which have 512-byte sectors, or can

            
            	  be switched to that mode. Due to the ACSI command format, only disks

            
            	  up to 1 GB are supported. Special support for certain ACSI to SCSI

            
            	  adapters, which could relax that, isn't included yet. The ACSI

            
            	  driver is also the basis for certain other drivers for devices

            
            	  attached to the ACSI bus: Atari SLM laser printer, BioNet-100

            
            	  Ethernet, and PAMsNet Ethernet. If you want to use one of these

            
            	  devices, you need ACSI support, too.


            	  To compile this driver as a module, choose M here: the

            
            	  module will be called acsi.


            comment "Some devices (e.g. CD jukebox) support multiple LUNs"

            
            	depends on ATARI && ATARI_ACSI


            config ACSI_MULTI_LUN

            
            	bool "Probe all LUNs on each ACSI device"

            
            	depends on ATARI_ACSI

            
            	help

            
            	  If you have a ACSI device that supports more than one LUN (Logical

            
            	  Unit Number), e.g. a CD jukebox, you should say Y here so that all

            
            	  will be found by the ACSI driver. An ACSI device with multiple LUNs

            
            	  acts logically like multiple ACSI devices. The vast majority of ACSI

            
            	  devices have only one LUN, and so most people can say N here and

            
            	  should in fact do so, because it is safer.


            config ATARI_SLM

            
            	tristate "Atari SLM laser printer support"

            
            	depends on ATARI && ATARI_ACSI!=n

            
            	help

            
            	  If you have an Atari SLM laser printer, say Y to include support for

            
            	  it in the kernel. Otherwise, say N. This driver is also available as

            
            	  a module ( = code which can be inserted in and removed from the

            
            	  running kernel whenever you want). The module will be called

            
            	  acsi_slm. Be warned: the driver needs much ST-RAM and can cause

            
            	  problems due to that fact!


            config BLK_DEV_XD

            
            	tristate "XT hard disk support"

            
            	depends on ISA && ISA_DMA_API

            
            	help

            
            	  Very old 8 bit hard disk controllers used in the IBM XT computer

            
            	  will be supported if you say Y here.


            	  To compile this driver as a module, choose M here: the

            
            	  module will be called xd.


            	  It's pretty unlikely that you have one of these: say N.


            config PARIDE

            
            	tristate "Parallel port IDE device support"

            
            	depends on PARPORT_PC

            
            	---help---

            
            	  There are many external CD-ROM and disk devices that connect through

            
            	  your computer's parallel port. Most of them are actually IDE devices

            
            	  using a parallel port IDE adapter. This option enables the PARIDE

            
            	  subsystem which contains drivers for many of these external drives.

            
            	  Read <file:Documentation/paride.txt> for more information.


            	  If you have said Y to the "Parallel-port support" configuration

            
            	  option, you may share a single port between your printer and other

            
            	  parallel port devices. Answer Y to build PARIDE support into your

            
            	  kernel, or M if you would like to build it as a loadable module. If

            
            	  your parallel port support is in a loadable module, you must build

            
            	  PARIDE as a module. If you built PARIDE support into your kernel,

            
            	  you may still build the individual protocol modules and high-level

            
            	  drivers as loadable modules. If you build this support as a module,

            
            	  it will be called paride.


            	  To use the PARIDE support, you must say Y or M here and also to at

            
            	  least one high-level driver (e.g. "Parallel port IDE disks",

            
            	  "Parallel port ATAPI CD-ROMs", "Parallel port ATAPI disks" etc.) and

            
            	  to at least one protocol driver (e.g. "ATEN EH-100 protocol",

            
            	  "MicroSolutions backpack protocol", "DataStor Commuter protocol"

            
            	  etc.).


            source "drivers/block/paride/Kconfig"


            config BLK_CPQ_DA

            
            	tristate "Compaq SMART2 support"

            
            	depends on PCI

            
            	help

            
            	  This is the driver for Compaq Smart Array controllers.  Everyone

            
            	  using these boards should say Y here.  See the file

            
            	  <file:Documentation/cpqarray.txt> for the current list of boards

            
            	  supported by this driver, and for further information on the use of

            
            	  this driver.


            config BLK_CPQ_CISS_DA

            
            	tristate "Compaq Smart Array 5xxx support"

            
            	depends on PCI

            
            	help

            
            	  This is the driver for Compaq Smart Array 5xxx controllers.

            
            	  Everyone using these boards should say Y here.

            
            	  See <file:Documentation/cciss.txt> for the current list of

            
            	  boards supported by this driver, and for further information

            
            	  on the use of this driver.


            config CISS_SCSI_TAPE

            
            	bool "SCSI tape drive support for Smart Array 5xxx"

            
            	depends on BLK_CPQ_CISS_DA && SCSI && PROC_FS

            
            	help

            
            	  When enabled (Y), this option allows SCSI tape drives and SCSI medium

            
            	  changers (tape robots) to be accessed via a Compaq 5xxx array

            
            	  controller.  (See <file:Documentation/cciss.txt> for more details.)


            	  "SCSI support" and "SCSI tape support" must also be enabled for this

            
            	  option to work.


            	  When this option is disabled (N), the SCSI portion of the driver

            
            	  is not compiled.


            config BLK_DEV_DAC960

            
            	tristate "Mylex DAC960/DAC1100 PCI RAID Controller support"

            
            	depends on PCI

            
            	help

            
            	  This driver adds support for the Mylex DAC960, AcceleRAID, and

            
            	  eXtremeRAID PCI RAID controllers.  See the file

            
            	  <file:Documentation/README.DAC960> for further information about

            
            	  this driver.


            	  To compile this driver as a module, choose M here: the

            
            	  module will be called DAC960.


            config BLK_DEV_UMEM

            
            	tristate "Micro Memory MM5415 Battery Backed RAM support (EXPERIMENTAL)"

            
            	depends on PCI && EXPERIMENTAL

            
            	---help---

            
            	  Saying Y here will include support for the MM5415 family of

            
            	  battery backed (Non-volatile) RAM cards.

            
            	  <http://www.umem.com/>


            	  The cards appear as block devices that can be partitioned into

            
            	  as many as 15 partitions.


            	  To compile this driver as a module, choose M here: the

            
            	  module will be called umem.


            	  The umem driver has not yet been allocated a MAJOR number, so

            
            	  one is chosen dynamically.  Use "devfs" or look in /proc/devices

            
            	  for the device number


            config BLK_DEV_UBD

            
            	bool "Virtual block device"

            
            	depends on UML

            
            	---help---

            
                      The User-Mode Linux port includes a driver called UBD which will let

            
                      you access arbitrary files on the host computer as block devices.

            
                      Unless you know that you do not need such virtual block devices say

            
                      Y here.


            config BLK_DEV_UBD_SYNC

            
            	bool "Always do synchronous disk IO for UBD"

            
            	depends on BLK_DEV_UBD

            
            	---help---

            
            	  Writes to the virtual block device are not immediately written to the

            
            	  host's disk; this may cause problems if, for example, the User-Mode

            
            	  Linux 'Virtual Machine' uses a journalling filesystem and the host

            
            	  computer crashes.


                      Synchronous operation (i.e. always writing data to the host's disk

            
                      immediately) is configurable on a per-UBD basis by using a special

            
                      kernel command line option.  Alternatively, you can say Y here to

            
                      turn on synchronous operation by default for all block devices.


                      If you're running a journalling file system (like reiserfs, for

            
                      example) in your virtual machine, you will want to say Y here.  If

            
                      you care for the safety of the data in your virtual machine, Y is a

            
                      wise choice too.  In all other cases (for example, if you're just

            
                      playing around with User-Mode Linux) you can choose N.


            config BLK_DEV_COW_COMMON

            
            	bool

            
            	default BLK_DEV_UBD


            config MMAPPER

            
            	tristate "Example IO memory driver (BROKEN)"

            
            	depends on UML && BROKEN

            
            	---help---

            
                      The User-Mode Linux port can provide support for IO Memory

            
                      emulation with this option.  This allows a host file to be

            
                      specified as an I/O region on the kernel command line. That file

            
                      will be mapped into UML's kernel address space where a driver can

            
                      locate it and do whatever it wants with the memory, including

            
                      providing an interface to it for UML processes to use.


                      For more information, see

            
                      <http://user-mode-linux.sourceforge.net/iomem.html>.


                      If you'd like to be able to provide a simulated IO port space for

            
                      User-Mode Linux processes, say Y.  If unsure, say N.


            config BLK_DEV_LOOP

            
            	tristate "Loopback device support"

            
            	---help---

            
            	  Saying Y here will allow you to use a regular file as a block

            
            	  device; you can then create a file system on that block device and

            
            	  mount it just as you would mount other block devices such as hard

            
            	  drive partitions, CD-ROM drives or floppy drives. The loop devices

            
            	  are block special device files with major number 7 and typically

            
            	  called /dev/loop0, /dev/loop1 etc.


            	  This is useful if you want to check an ISO 9660 file system before

            
            	  burning the CD, or if you want to use floppy images without first

            
            	  writing them to floppy. Furthermore, some Linux distributions avoid

            
            	  the need for a dedicated Linux partition by keeping their complete

            
            	  root file system inside a DOS FAT file using this loop device

            
            	  driver.


            	  To use the loop device, you need the losetup utility, found in the

            
            	  util-linux package, see

            
            	  <ftp://ftp.kernel.org/pub/linux/utils/util-linux/>.


            	  The loop device driver can also be used to "hide" a file system in

            
            	  a disk partition, floppy, or regular file, either using encryption

            
            	  (scrambling the data) or steganography (hiding the data in the low

            
            	  bits of, say, a sound file). This is also safe if the file resides

            
            	  on a remote file server.


            	  There are several ways of encrypting disks. Some of these require

            
            	  kernel patches. The vanilla kernel offers the cryptoloop option

            
            	  and a Device Mapper target (which is superior, as it supports all

            
            	  file systems). If you want to use the cryptoloop, say Y to both

            
            	  LOOP and CRYPTOLOOP, and make sure you have a recent (version 2.12

            
            	  or later) version of util-linux. Additionally, be aware that

            
            	  the cryptoloop is not safe for storing journaled filesystems.


            	  Note that this loop device has nothing to do with the loopback

            
            	  device used for network connections from the machine to itself.


            	  To compile this driver as a module, choose M here: the

            
            	  module will be called loop.


            	  Most users will answer N here.


            config BLK_DEV_CRYPTOLOOP

            
            	tristate "Cryptoloop Support"

            
            	select CRYPTO

            
            	depends on BLK_DEV_LOOP

            
            	---help---

            
            	  Say Y here if you want to be able to use the ciphers that are

            
            	  provided by the CryptoAPI as loop transformation. This might be

            
            	  used as hard disk encryption.


            	  WARNING: This device is not safe for journaled file systems like

            
            	  ext3 or Reiserfs. Please use the Device Mapper crypto module

            
            	  instead, which can be configured to be on-disk compatible with the

            
            	  cryptoloop device.


            config BLK_DEV_NBD

            
            	tristate "Network block device support"

            
            	depends on NET

            
            	---help---

            
            	  Saying Y here will allow your computer to be a client for network

            
            	  block devices, i.e. it will be able to use block devices exported by

            
            	  servers (mount file systems on them etc.). Communication between

            
            	  client and server works over TCP/IP networking, but to the client

            
            	  program this is hidden: it looks like a regular local file access to

            
            	  a block device special file such as /dev/nd0.


            	  Network block devices also allows you to run a block-device in

            
            	  userland (making server and client physically the same computer,

            
            	  communicating using the loopback network device).


            	  Read <file:Documentation/nbd.txt> for more information, especially

            
            	  about where to find the server code, which runs in user space and

            
            	  does not need special kernel support.


            	  Note that this has nothing to do with the network file systems NFS

            
            	  or Coda; you can say N here even if you intend to use NFS or Coda.


            	  To compile this driver as a module, choose M here: the

            
            	  module will be called nbd.


            	  If unsure, say N.


            config BLK_DEV_SX8

            
            	tristate "Promise SATA SX8 support"

            
            	depends on PCI

            
            	---help---

            
            	  Saying Y or M here will enable support for the

            
            	  Promise SATA SX8 controllers.


            	  Use devices /dev/sx8/$N and /dev/sx8/$Np$M.


            config BLK_DEV_UB

            
            	tristate "Low Performance USB Block driver"

            
            	depends on USB

            
            	help

            
            	  This driver supports certain USB attached storage devices

            
            	  such as flash keys.


            	  If you enable this driver, it is recommended to avoid conflicts

            
            	  with usb-storage by enabling USB_LIBUSUAL.


            	  If unsure, say N.


            config BLK_DEV_RAM

            
            	tristate "RAM disk support"

            
            	---help---

            
            	  Saying Y here will allow you to use a portion of your RAM memory as

            
            	  a block device, so that you can make file systems on it, read and

            
            	  write to it and do all the other things that you can do with normal

            
            	  block devices (such as hard drives). It is usually used to load and

            
            	  store a copy of a minimal root file system off of a floppy into RAM

            
            	  during the initial install of Linux.


            	  Note that the kernel command line option "ramdisk=XX" is now

            
            	  obsolete. For details, read <file:Documentation/ramdisk.txt>.


            	  To compile this driver as a module, choose M here: the

            
            	  module will be called rd.


            	  Most normal users won't need the RAM disk functionality, and can

            
            	  thus say N here.


            config BLK_DEV_RAM_COUNT

            
            	int "Default number of RAM disks"

            
            	default "16"

            
            	depends on BLK_DEV_RAM

            
            	help

            
            	  The default value is 16 RAM disks. Change this if you know what

            
            	  are doing. If you boot from a filesystem that needs to be extracted

            
            	  in memory, you will need at least one RAM disk (e.g. root on cramfs).


            config BLK_DEV_RAM_SIZE

            
            	int "Default RAM disk size (kbytes)"

            
            	depends on BLK_DEV_RAM

            
            	default "4096"

            
            	help

            
            	  The default value is 4096 kilobytes. Only change this if you know

            
            	  what are you doing. If you are using IBM S/390, then set this to

            
            	  8192.


            config BLK_DEV_INITRD

            
            	bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"

            
            	help

            
            	  The initial RAM filesystem is a ramfs which is loaded by the

            
            	  boot loader (loadlin or lilo) and that is mounted as root

            
            	  before the normal boot procedure. It is typically used to

            
            	  load modules needed to mount the "real" root file system,

            
            	  etc. See <file:Documentation/initrd.txt> for details.


            	  If RAM disk support (BLK_DEV_RAM) is also included, this

            
            	  also enables initial RAM disk (initrd) support.


            config CDROM_PKTCDVD

            
            	tristate "Packet writing on CD/DVD media"

            
            	depends on !UML

            
            	help

            
            	  If you have a CDROM drive that supports packet writing, say Y to

            
            	  include preliminary support. It should work with any MMC/Mt Fuji

            
            	  compliant ATAPI or SCSI drive, which is just about any newer CD

            
            	  writer.


            	  Currently only writing to CD-RW, DVD-RW and DVD+RW discs is possible.

            
            	  DVD-RW disks must be in restricted overwrite mode.


            	  To compile this driver as a module, choose M here: the

            
            	  module will be called pktcdvd.


            config CDROM_PKTCDVD_BUFFERS

            
            	int "Free buffers for data gathering"

            
            	depends on CDROM_PKTCDVD

            
            	default "8"

            
            	help

            
            	  This controls the maximum number of active concurrent packets. More

            
            	  concurrent packets can increase write performance, but also require

            
            	  more memory. Each concurrent packet will require approximately 64Kb

            
            	  of non-swappable kernel memory, memory which will be allocated when

            
            	  a disc is opened for writing.


            config CDROM_PKTCDVD_WCACHE

            
            	bool "Enable write caching (EXPERIMENTAL)"

            
            	depends on CDROM_PKTCDVD && EXPERIMENTAL

            
            	help

            
            	  If enabled, write caching will be set for the CD-R/W device. For now

            
            	  this option is dangerous unless the CD-RW media is known good, as we

            
            	  don't do deferred write error handling yet.


            source "drivers/s390/block/Kconfig"


            config ATA_OVER_ETH

            
            	tristate "ATA over Ethernet support"

            
            	depends on NET

            
            	help

            
            	This driver provides Support for ATA over Ethernet block

            
            	devices like the Coraid EtherDrive (R) Storage Blade.


            endmenu
	#
	# Block device driver configuration
	#

	menu "Block devices"

	config BLK_DEV_FD
	tristate "Normal floppy disk support"
	depends on ARCH_MAY_HAVE_PC_FDC
	---help---
	If you want to use the floppy disk drive(s) of your PC under Linux,
	say Y. Information about this driver, especially important for IBM
	Thinkpad users, is contained in <file:Documentation/floppy.txt>.
	That file also contains the location of the Floppy driver FAQ as
	well as location of the fdutils package used to configure additional
	parameters of the driver at run time.

	To compile this driver as a module, choose M here: the
	module will be called floppy.

	config AMIGA_FLOPPY
	tristate "Amiga floppy support"
	depends on AMIGA

	config ATARI_FLOPPY
	tristate "Atari floppy support"
	depends on ATARI

	config BLK_DEV_SWIM_IOP
	bool "Macintosh IIfx/Quadra 900/Quadra 950 floppy support (EXPERIMENTAL)"
	depends on MAC && EXPERIMENTAL && BROKEN
	help
	Say Y here to support the SWIM (Super Woz Integrated Machine) IOP
	floppy controller on the Macintosh IIfx and Quadra 900/950.

	config MAC_FLOPPY
	tristate "Support for PowerMac floppy"
	depends on PPC_PMAC && !PPC_PMAC64
	help
	If you have a SWIM-3 (Super Woz Integrated Machine 3; from Apple)
	floppy controller, say Y here. Most commonly found in PowerMacs.

	config BLK_DEV_PS2
	tristate "PS/2 ESDI hard disk support"
	depends on MCA && MCA_LEGACY && BROKEN
	help
	Say Y here if you have a PS/2 machine with a MCA bus and an ESDI
	hard disk.

	To compile this driver as a module, choose M here: the
	module will be called ps2esdi.

	config AMIGA_Z2RAM
	tristate "Amiga Zorro II ramdisk support"
	depends on ZORRO
	help
	This enables support for using Chip RAM and Zorro II RAM as a
	ramdisk or as a swap partition. Say Y if you want to include this
	driver in the kernel.

	To compile this driver as a module, choose M here: the
	module will be called z2ram.

	config ATARI_ACSI
	tristate "Atari ACSI support"
	depends on ATARI && BROKEN
	---help---
	This enables support for the Atari ACSI interface. The driver
	supports hard disks and CD-ROMs, which have 512-byte sectors, or can
	be switched to that mode. Due to the ACSI command format, only disks
	up to 1 GB are supported. Special support for certain ACSI to SCSI
	adapters, which could relax that, isn't included yet. The ACSI
	driver is also the basis for certain other drivers for devices
	attached to the ACSI bus: Atari SLM laser printer, BioNet-100
	Ethernet, and PAMsNet Ethernet. If you want to use one of these
	devices, you need ACSI support, too.

	To compile this driver as a module, choose M here: the
	module will be called acsi.

	comment "Some devices (e.g. CD jukebox) support multiple LUNs"
	depends on ATARI && ATARI_ACSI

	config ACSI_MULTI_LUN
	bool "Probe all LUNs on each ACSI device"
	depends on ATARI_ACSI
	help
	If you have a ACSI device that supports more than one LUN (Logical
	Unit Number), e.g. a CD jukebox, you should say Y here so that all
	will be found by the ACSI driver. An ACSI device with multiple LUNs
	acts logically like multiple ACSI devices. The vast majority of ACSI
	devices have only one LUN, and so most people can say N here and
	should in fact do so, because it is safer.

	config ATARI_SLM
	tristate "Atari SLM laser printer support"
	depends on ATARI && ATARI_ACSI!=n
	help
	If you have an Atari SLM laser printer, say Y to include support for
	it in the kernel. Otherwise, say N. This driver is also available as
	a module ( = code which can be inserted in and removed from the
	running kernel whenever you want). The module will be called
	acsi_slm. Be warned: the driver needs much ST-RAM and can cause
	problems due to that fact!

	config BLK_DEV_XD
	tristate "XT hard disk support"
	depends on ISA && ISA_DMA_API
	help
	Very old 8 bit hard disk controllers used in the IBM XT computer
	will be supported if you say Y here.

	To compile this driver as a module, choose M here: the
	module will be called xd.

	It's pretty unlikely that you have one of these: say N.

	config PARIDE
	tristate "Parallel port IDE device support"
	depends on PARPORT_PC
	---help---
	There are many external CD-ROM and disk devices that connect through
	your computer's parallel port. Most of them are actually IDE devices
	using a parallel port IDE adapter. This option enables the PARIDE
	subsystem which contains drivers for many of these external drives.
	Read <file:Documentation/paride.txt> for more information.

	If you have said Y to the "Parallel-port support" configuration
	option, you may share a single port between your printer and other
	parallel port devices. Answer Y to build PARIDE support into your
	kernel, or M if you would like to build it as a loadable module. If
	your parallel port support is in a loadable module, you must build
	PARIDE as a module. If you built PARIDE support into your kernel,
	you may still build the individual protocol modules and high-level
	drivers as loadable modules. If you build this support as a module,
	it will be called paride.

	To use the PARIDE support, you must say Y or M here and also to at
	least one high-level driver (e.g. "Parallel port IDE disks",
	"Parallel port ATAPI CD-ROMs", "Parallel port ATAPI disks" etc.) and
	to at least one protocol driver (e.g. "ATEN EH-100 protocol",
	"MicroSolutions backpack protocol", "DataStor Commuter protocol"
	etc.).

	source "drivers/block/paride/Kconfig"

	config BLK_CPQ_DA
	tristate "Compaq SMART2 support"
	depends on PCI
	help
	This is the driver for Compaq Smart Array controllers. Everyone
	using these boards should say Y here. See the file
	<file:Documentation/cpqarray.txt> for the current list of boards
	supported by this driver, and for further information on the use of
	this driver.

	config BLK_CPQ_CISS_DA
	tristate "Compaq Smart Array 5xxx support"
	depends on PCI
	help
	This is the driver for Compaq Smart Array 5xxx controllers.
	Everyone using these boards should say Y here.
	See <file:Documentation/cciss.txt> for the current list of
	boards supported by this driver, and for further information
	on the use of this driver.

	config CISS_SCSI_TAPE
	bool "SCSI tape drive support for Smart Array 5xxx"
	depends on BLK_CPQ_CISS_DA && SCSI && PROC_FS
	help
	When enabled (Y), this option allows SCSI tape drives and SCSI medium
	changers (tape robots) to be accessed via a Compaq 5xxx array
	controller. (See <file:Documentation/cciss.txt> for more details.)

	"SCSI support" and "SCSI tape support" must also be enabled for this
	option to work.

	When this option is disabled (N), the SCSI portion of the driver
	is not compiled.

	config BLK_DEV_DAC960
	tristate "Mylex DAC960/DAC1100 PCI RAID Controller support"
	depends on PCI
	help
	This driver adds support for the Mylex DAC960, AcceleRAID, and
	eXtremeRAID PCI RAID controllers. See the file
	<file:Documentation/README.DAC960> for further information about
	this driver.

	To compile this driver as a module, choose M here: the
	module will be called DAC960.

	config BLK_DEV_UMEM
	tristate "Micro Memory MM5415 Battery Backed RAM support (EXPERIMENTAL)"
	depends on PCI && EXPERIMENTAL
	---help---
	Saying Y here will include support for the MM5415 family of
	battery backed (Non-volatile) RAM cards.
	<http://www.umem.com/>

	The cards appear as block devices that can be partitioned into
	as many as 15 partitions.

	To compile this driver as a module, choose M here: the
	module will be called umem.

	The umem driver has not yet been allocated a MAJOR number, so
	one is chosen dynamically. Use "devfs" or look in /proc/devices
	for the device number

	config BLK_DEV_UBD
	bool "Virtual block device"
	depends on UML
	---help---
	The User-Mode Linux port includes a driver called UBD which will let
	you access arbitrary files on the host computer as block devices.
	Unless you know that you do not need such virtual block devices say
	Y here.

	config BLK_DEV_UBD_SYNC
	bool "Always do synchronous disk IO for UBD"
	depends on BLK_DEV_UBD
	---help---
	Writes to the virtual block device are not immediately written to the
	host's disk; this may cause problems if, for example, the User-Mode
	Linux 'Virtual Machine' uses a journalling filesystem and the host
	computer crashes.

	Synchronous operation (i.e. always writing data to the host's disk
	immediately) is configurable on a per-UBD basis by using a special
	kernel command line option. Alternatively, you can say Y here to
	turn on synchronous operation by default for all block devices.

	If you're running a journalling file system (like reiserfs, for
	example) in your virtual machine, you will want to say Y here. If
	you care for the safety of the data in your virtual machine, Y is a
	wise choice too. In all other cases (for example, if you're just
	playing around with User-Mode Linux) you can choose N.

	config BLK_DEV_COW_COMMON
	bool
	default BLK_DEV_UBD

	config MMAPPER
	tristate "Example IO memory driver (BROKEN)"
	depends on UML && BROKEN
	---help---
	The User-Mode Linux port can provide support for IO Memory
	emulation with this option. This allows a host file to be
	specified as an I/O region on the kernel command line. That file
	will be mapped into UML's kernel address space where a driver can
	locate it and do whatever it wants with the memory, including
	providing an interface to it for UML processes to use.

	For more information, see
	<http://user-mode-linux.sourceforge.net/iomem.html>.

	If you'd like to be able to provide a simulated IO port space for
	User-Mode Linux processes, say Y. If unsure, say N.

	config BLK_DEV_LOOP
	tristate "Loopback device support"
	---help---
	Saying Y here will allow you to use a regular file as a block
	device; you can then create a file system on that block device and
	mount it just as you would mount other block devices such as hard
	drive partitions, CD-ROM drives or floppy drives. The loop devices
	are block special device files with major number 7 and typically
	called /dev/loop0, /dev/loop1 etc.

	This is useful if you want to check an ISO 9660 file system before
	burning the CD, or if you want to use floppy images without first
	writing them to floppy. Furthermore, some Linux distributions avoid
	the need for a dedicated Linux partition by keeping their complete
	root file system inside a DOS FAT file using this loop device
	driver.

	To use the loop device, you need the losetup utility, found in the
	util-linux package, see
	<ftp://ftp.kernel.org/pub/linux/utils/util-linux/>.

	The loop device driver can also be used to "hide" a file system in
	a disk partition, floppy, or regular file, either using encryption
	(scrambling the data) or steganography (hiding the data in the low
	bits of, say, a sound file). This is also safe if the file resides
	on a remote file server.

	There are several ways of encrypting disks. Some of these require
	kernel patches. The vanilla kernel offers the cryptoloop option
	and a Device Mapper target (which is superior, as it supports all
	file systems). If you want to use the cryptoloop, say Y to both
	LOOP and CRYPTOLOOP, and make sure you have a recent (version 2.12
	or later) version of util-linux. Additionally, be aware that
	the cryptoloop is not safe for storing journaled filesystems.

	Note that this loop device has nothing to do with the loopback
	device used for network connections from the machine to itself.

	To compile this driver as a module, choose M here: the
	module will be called loop.

	Most users will answer N here.

	config BLK_DEV_CRYPTOLOOP
	tristate "Cryptoloop Support"
	select CRYPTO
	depends on BLK_DEV_LOOP
	---help---
	Say Y here if you want to be able to use the ciphers that are
	provided by the CryptoAPI as loop transformation. This might be
	used as hard disk encryption.

	WARNING: This device is not safe for journaled file systems like
	ext3 or Reiserfs. Please use the Device Mapper crypto module
	instead, which can be configured to be on-disk compatible with the
	cryptoloop device.

	config BLK_DEV_NBD
	tristate "Network block device support"
	depends on NET
	---help---
	Saying Y here will allow your computer to be a client for network
	block devices, i.e. it will be able to use block devices exported by
	servers (mount file systems on them etc.). Communication between
	client and server works over TCP/IP networking, but to the client
	program this is hidden: it looks like a regular local file access to
	a block device special file such as /dev/nd0.

	Network block devices also allows you to run a block-device in
	userland (making server and client physically the same computer,
	communicating using the loopback network device).

	Read <file:Documentation/nbd.txt> for more information, especially
	about where to find the server code, which runs in user space and
	does not need special kernel support.

	Note that this has nothing to do with the network file systems NFS
	or Coda; you can say N here even if you intend to use NFS or Coda.

	To compile this driver as a module, choose M here: the
	module will be called nbd.

	If unsure, say N.

	config BLK_DEV_SX8
	tristate "Promise SATA SX8 support"
	depends on PCI
	---help---
	Saying Y or M here will enable support for the
	Promise SATA SX8 controllers.

	Use devices /dev/sx8/$N and /dev/sx8/$Np$M.

	config BLK_DEV_UB
	tristate "Low Performance USB Block driver"
	depends on USB
	help
	This driver supports certain USB attached storage devices
	such as flash keys.

	If you enable this driver, it is recommended to avoid conflicts
	with usb-storage by enabling USB_LIBUSUAL.

	If unsure, say N.

	config BLK_DEV_RAM
	tristate "RAM disk support"
	---help---
	Saying Y here will allow you to use a portion of your RAM memory as
	a block device, so that you can make file systems on it, read and
	write to it and do all the other things that you can do with normal
	block devices (such as hard drives). It is usually used to load and
	store a copy of a minimal root file system off of a floppy into RAM
	during the initial install of Linux.

	Note that the kernel command line option "ramdisk=XX" is now
	obsolete. For details, read <file:Documentation/ramdisk.txt>.

	To compile this driver as a module, choose M here: the
	module will be called rd.

	Most normal users won't need the RAM disk functionality, and can
	thus say N here.

	config BLK_DEV_RAM_COUNT
	int "Default number of RAM disks"
	default "16"
	depends on BLK_DEV_RAM
	help
	The default value is 16 RAM disks. Change this if you know what
	are doing. If you boot from a filesystem that needs to be extracted
	in memory, you will need at least one RAM disk (e.g. root on cramfs).

	config BLK_DEV_RAM_SIZE
	int "Default RAM disk size (kbytes)"
	depends on BLK_DEV_RAM
	default "4096"
	help
	The default value is 4096 kilobytes. Only change this if you know
	what are you doing. If you are using IBM S/390, then set this to
	8192.

	config BLK_DEV_INITRD
	bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
	help
	The initial RAM filesystem is a ramfs which is loaded by the
	boot loader (loadlin or lilo) and that is mounted as root
	before the normal boot procedure. It is typically used to
	load modules needed to mount the "real" root file system,
	etc. See <file:Documentation/initrd.txt> for details.

	If RAM disk support (BLK_DEV_RAM) is also included, this
	also enables initial RAM disk (initrd) support.


	config CDROM_PKTCDVD
	tristate "Packet writing on CD/DVD media"
	depends on !UML
	help
	If you have a CDROM drive that supports packet writing, say Y to
	include preliminary support. It should work with any MMC/Mt Fuji
	compliant ATAPI or SCSI drive, which is just about any newer CD
	writer.

	Currently only writing to CD-RW, DVD-RW and DVD+RW discs is possible.
	DVD-RW disks must be in restricted overwrite mode.

	To compile this driver as a module, choose M here: the
	module will be called pktcdvd.

	config CDROM_PKTCDVD_BUFFERS
	int "Free buffers for data gathering"
	depends on CDROM_PKTCDVD
	default "8"
	help
	This controls the maximum number of active concurrent packets. More
	concurrent packets can increase write performance, but also require
	more memory. Each concurrent packet will require approximately 64Kb
	of non-swappable kernel memory, memory which will be allocated when
	a disc is opened for writing.

	config CDROM_PKTCDVD_WCACHE
	bool "Enable write caching (EXPERIMENTAL)"
	depends on CDROM_PKTCDVD && EXPERIMENTAL
	help
	If enabled, write caching will be set for the CD-R/W device. For now
	this option is dangerous unless the CD-RW media is known good, as we
	don't do deferred write error handling yet.

	source "drivers/s390/block/Kconfig"

	config ATA_OVER_ETH
	tristate "ATA over Ethernet support"
	depends on NET
	help
	This driver provides Support for ATA over Ethernet block
	devices like the Coraid EtherDrive (R) Storage Blade.

	endmenu