drivers/block/Kconfig

   1 #
   2 # Block device driver configuration
   3 #
   4
   5 menu "Block devices"
   6
   7 config BLK_DEV_FD
   8         tristate "Normal floppy disk support"
   9         depends on (!ARCH_S390 && !M68K && !IA64 && !UML) || Q40 || (SUN3X && BROKEN)
  10         ---help---
  11           If you want to use the floppy disk drive(s) of your PC under Linux,
  12           say Y. Information about this driver, especially important for IBM
  13           Thinkpad users, is contained in <file:Documentation/floppy.txt>.
  14           That file also contains the location of the Floppy driver FAQ as
  15           well as location of the fdutils package used to configure additional
  16           parameters of the driver at run time.
  17
  18           To compile this driver as a module, choose M here: the
  19           module will be called floppy.
  20
  21 config AMIGA_FLOPPY
  22         tristate "Amiga floppy support"
  23         depends on AMIGA
  24
  25 config ATARI_FLOPPY
  26         tristate "Atari floppy support"
  27         depends on ATARI
  28
  29 config BLK_DEV_SWIM_IOP
  30         bool "Macintosh IIfx/Quadra 900/Quadra 950 floppy support (EXPERIMENTAL)"
  31         depends on MAC && EXPERIMENTAL && BROKEN
  32         help
  33           Say Y here to support the SWIM (Super Woz Integrated Machine) IOP
  34           floppy controller on the Macintosh IIfx and Quadra 900/950.
  35
  36 config MAC_FLOPPY
  37         tristate "Support for PowerMac floppy"
  38         depends on PPC_PMAC && !PPC_PMAC64
  39         help
  40           If you have a SWIM-3 (Super Woz Integrated Machine 3; from Apple)
  41           floppy controller, say Y here. Most commonly found in PowerMacs.
  42
  43 config BLK_DEV_PS2
  44         tristate "PS/2 ESDI hard disk support"
  45         depends on MCA && MCA_LEGACY && BROKEN
  46         help
  47           Say Y here if you have a PS/2 machine with a MCA bus and an ESDI
  48           hard disk.
  49
  50           To compile this driver as a module, choose M here: the
  51           module will be called ps2esdi.
  52
  53 config AMIGA_Z2RAM
  54         tristate "Amiga Zorro II ramdisk support"
  55         depends on ZORRO
  56         help
  57           This enables support for using Chip RAM and Zorro II RAM as a
  58           ramdisk or as a swap partition. Say Y if you want to include this
  59           driver in the kernel.
  60
  61           To compile this driver as a module, choose M here: the
  62           module will be called z2ram.
  63
  64 config ATARI_ACSI
  65         tristate "Atari ACSI support"
  66         depends on ATARI && BROKEN
  67         ---help---
  68           This enables support for the Atari ACSI interface. The driver
  69           supports hard disks and CD-ROMs, which have 512-byte sectors, or can
  70           be switched to that mode. Due to the ACSI command format, only disks
  71           up to 1 GB are supported. Special support for certain ACSI to SCSI
  72           adapters, which could relax that, isn't included yet. The ACSI
  73           driver is also the basis for certain other drivers for devices
  74           attached to the ACSI bus: Atari SLM laser printer, BioNet-100
  75           Ethernet, and PAMsNet Ethernet. If you want to use one of these
  76           devices, you need ACSI support, too.
  77
  78           To compile this driver as a module, choose M here: the
  79           module will be called acsi.
  80
  81 comment "Some devices (e.g. CD jukebox) support multiple LUNs"
  82         depends on ATARI && ATARI_ACSI
  83
  84 config ACSI_MULTI_LUN
  85         bool "Probe all LUNs on each ACSI device"
  86         depends on ATARI_ACSI
  87         help
  88           If you have a ACSI device that supports more than one LUN (Logical
  89           Unit Number), e.g. a CD jukebox, you should say Y here so that all
  90           will be found by the ACSI driver. An ACSI device with multiple LUNs
  91           acts logically like multiple ACSI devices. The vast majority of ACSI
  92           devices have only one LUN, and so most people can say N here and
  93           should in fact do so, because it is safer.
  94
  95 config ATARI_SLM
  96         tristate "Atari SLM laser printer support"
  97         depends on ATARI && ATARI_ACSI!=n
  98         help
  99           If you have an Atari SLM laser printer, say Y to include support for
 100           it in the kernel. Otherwise, say N. This driver is also available as
 101           a module ( = code which can be inserted in and removed from the
 102           running kernel whenever you want). The module will be called
 103           acsi_slm. Be warned: the driver needs much ST-RAM and can cause
 104           problems due to that fact!
 105
 106 config BLK_DEV_XD
 107         tristate "XT hard disk support"
 108         depends on ISA
 109         help
 110           Very old 8 bit hard disk controllers used in the IBM XT computer
 111           will be supported if you say Y here.
 112
 113           To compile this driver as a module, choose M here: the
 114           module will be called xd.
 115
 116           It's pretty unlikely that you have one of these: say N.
 117
 118 config PARIDE
 119         tristate "Parallel port IDE device support"
 120         depends on PARPORT
 121         ---help---
 122           There are many external CD-ROM and disk devices that connect through
 123           your computer's parallel port. Most of them are actually IDE devices
 124           using a parallel port IDE adapter. This option enables the PARIDE
 125           subsystem which contains drivers for many of these external drives.
 126           Read <file:Documentation/paride.txt> for more information.
 127
 128           If you have said Y to the "Parallel-port support" configuration
 129           option, you may share a single port between your printer and other
 130           parallel port devices. Answer Y to build PARIDE support into your
 131           kernel, or M if you would like to build it as a loadable module. If
 132           your parallel port support is in a loadable module, you must build
 133           PARIDE as a module. If you built PARIDE support into your kernel,
 134           you may still build the individual protocol modules and high-level
 135           drivers as loadable modules. If you build this support as a module,
 136           it will be called paride.
 137
 138           To use the PARIDE support, you must say Y or M here and also to at
 139           least one high-level driver (e.g. "Parallel port IDE disks",
 140           "Parallel port ATAPI CD-ROMs", "Parallel port ATAPI disks" etc.) and
 141           to at least one protocol driver (e.g. "ATEN EH-100 protocol",
 142           "MicroSolutions backpack protocol", "DataStor Commuter protocol"
 143           etc.).
 144
 145 source "drivers/block/paride/Kconfig"
 146
 147 config BLK_CPQ_DA
 148         tristate "Compaq SMART2 support"
 149         depends on PCI
 150         help
 151           This is the driver for Compaq Smart Array controllers.  Everyone
 152           using these boards should say Y here.  See the file
 153           <file:Documentation/cpqarray.txt> for the current list of boards
 154           supported by this driver, and for further information on the use of
 155           this driver.
 156
 157 config BLK_CPQ_CISS_DA
 158         tristate "Compaq Smart Array 5xxx support"
 159         depends on PCI
 160         help
 161           This is the driver for Compaq Smart Array 5xxx controllers.
 162           Everyone using these boards should say Y here.
 163           See <file:Documentation/cciss.txt> for the current list of
 164           boards supported by this driver, and for further information
 165           on the use of this driver.
 166
 167 config CISS_SCSI_TAPE
 168         bool "SCSI tape drive support for Smart Array 5xxx"
 169         depends on BLK_CPQ_CISS_DA && SCSI && PROC_FS
 170         help
 171           When enabled (Y), this option allows SCSI tape drives and SCSI medium
 172           changers (tape robots) to be accessed via a Compaq 5xxx array
 173           controller.  (See <file:Documentation/cciss.txt> for more details.)
 174
 175           "SCSI support" and "SCSI tape support" must also be enabled for this
 176           option to work.
 177
 178           When this option is disabled (N), the SCSI portion of the driver
 179           is not compiled.
 180
 181 config BLK_DEV_DAC960
 182         tristate "Mylex DAC960/DAC1100 PCI RAID Controller support"
 183         depends on PCI
 184         help
 185           This driver adds support for the Mylex DAC960, AcceleRAID, and
 186           eXtremeRAID PCI RAID controllers.  See the file
 187           <file:Documentation/README.DAC960> for further information about
 188           this driver.
 189
 190           To compile this driver as a module, choose M here: the
 191           module will be called DAC960.
 192
 193 config BLK_DEV_UMEM
 194         tristate "Micro Memory MM5415 Battery Backed RAM support (EXPERIMENTAL)"
 195         depends on PCI && EXPERIMENTAL
 196         ---help---
 197           Saying Y here will include support for the MM5415 family of
 198           battery backed (Non-volatile) RAM cards.
 199           <http://www.umem.com/>
 200
 201           The cards appear as block devices that can be partitioned into
 202           as many as 15 partitions.
 203
 204           To compile this driver as a module, choose M here: the
 205           module will be called umem.
 206
 207           The umem driver has not yet been allocated a MAJOR number, so
 208           one is chosen dynamically.  Use "devfs" or look in /proc/devices
 209           for the device number
 210
 211 config BLK_DEV_UBD
 212         bool "Virtual block device"
 213         depends on UML
 214         ---help---
 215           The User-Mode Linux port includes a driver called UBD which will let
 216           you access arbitrary files on the host computer as block devices.
 217           Unless you know that you do not need such virtual block devices say
 218           Y here.
 219
 220 config BLK_DEV_UBD_SYNC
 221         bool "Always do synchronous disk IO for UBD"
 222         depends on BLK_DEV_UBD
 223         ---help---
 224           Writes to the virtual block device are not immediately written to the
 225           host's disk; this may cause problems if, for example, the User-Mode
 226           Linux 'Virtual Machine' uses a journalling filesystem and the host
 227           computer crashes.
 228
 229           Synchronous operation (i.e. always writing data to the host's disk
 230           immediately) is configurable on a per-UBD basis by using a special
 231           kernel command line option.  Alternatively, you can say Y here to
 232           turn on synchronous operation by default for all block devices.
 233
 234           If you're running a journalling file system (like reiserfs, for
 235           example) in your virtual machine, you will want to say Y here.  If
 236           you care for the safety of the data in your virtual machine, Y is a
 237           wise choice too.  In all other cases (for example, if you're just
 238           playing around with User-Mode Linux) you can choose N.
 239
 240 config BLK_DEV_COW_COMMON
 241         bool
 242         default BLK_DEV_UBD
 243
 244 config MMAPPER
 245         tristate "Example IO memory driver (BROKEN)"
 246         depends on UML && BROKEN
 247         ---help---
 248           The User-Mode Linux port can provide support for IO Memory
 249           emulation with this option.  This allows a host file to be
 250           specified as an I/O region on the kernel command line. That file
 251           will be mapped into UML's kernel address space where a driver can
 252           locate it and do whatever it wants with the memory, including
 253           providing an interface to it for UML processes to use.
 254
 255           For more information, see
 256           <http://user-mode-linux.sourceforge.net/iomem.html>.
 257
 258           If you'd like to be able to provide a simulated IO port space for
 259           User-Mode Linux processes, say Y.  If unsure, say N.
 260
 261 config BLK_DEV_LOOP
 262         tristate "Loopback device support"
 263         ---help---
 264           Saying Y here will allow you to use a regular file as a block
 265           device; you can then create a file system on that block device and
 266           mount it just as you would mount other block devices such as hard
 267           drive partitions, CD-ROM drives or floppy drives. The loop devices
 268           are block special device files with major number 7 and typically
 269           called /dev/loop0, /dev/loop1 etc.
 270
 271           This is useful if you want to check an ISO 9660 file system before
 272           burning the CD, or if you want to use floppy images without first
 273           writing them to floppy. Furthermore, some Linux distributions avoid
 274           the need for a dedicated Linux partition by keeping their complete
 275           root file system inside a DOS FAT file using this loop device
 276           driver.
 277
 278           To use the loop device, you need the losetup utility, found in the
 279           util-linux package, see
 280           <ftp://ftp.kernel.org/pub/linux/utils/util-linux/>.
 281
 282           The loop device driver can also be used to "hide" a file system in
 283           a disk partition, floppy, or regular file, either using encryption
 284           (scrambling the data) or steganography (hiding the data in the low
 285           bits of, say, a sound file). This is also safe if the file resides
 286           on a remote file server.
 287
 288           There are several ways of encrypting disks. Some of these require
 289           kernel patches. The vanilla kernel offers the cryptoloop option
 290           and a Device Mapper target (which is superior, as it supports all
 291           file systems). If you want to use the cryptoloop, say Y to both
 292           LOOP and CRYPTOLOOP, and make sure you have a recent (version 2.12
 293           or later) version of util-linux. Additionally, be aware that
 294           the cryptoloop is not safe for storing journaled filesystems.
 295
 296           Note that this loop device has nothing to do with the loopback
 297           device used for network connections from the machine to itself.
 298
 299           To compile this driver as a module, choose M here: the
 300           module will be called loop.
 301
 302           Most users will answer N here.
 303
 304 config BLK_DEV_CRYPTOLOOP
 305         tristate "Cryptoloop Support"
 306         select CRYPTO
 307         depends on BLK_DEV_LOOP
 308         ---help---
 309           Say Y here if you want to be able to use the ciphers that are
 310           provided by the CryptoAPI as loop transformation. This might be
 311           used as hard disk encryption.
 312
 313           WARNING: This device is not safe for journaled file systems like
 314           ext3 or Reiserfs. Please use the Device Mapper crypto module
 315           instead, which can be configured to be on-disk compatible with the
 316           cryptoloop device.
 317
 318 config BLK_DEV_NBD
 319         tristate "Network block device support"
 320         depends on NET
 321         ---help---
 322           Saying Y here will allow your computer to be a client for network
 323           block devices, i.e. it will be able to use block devices exported by
 324           servers (mount file systems on them etc.). Communication between
 325           client and server works over TCP/IP networking, but to the client
 326           program this is hidden: it looks like a regular local file access to
 327           a block device special file such as /dev/nd0.
 328
 329           Network block devices also allows you to run a block-device in
 330           userland (making server and client physically the same computer,
 331           communicating using the loopback network device).
 332
 333           Read <file:Documentation/nbd.txt> for more information, especially
 334           about where to find the server code, which runs in user space and
 335           does not need special kernel support.
 336
 337           Note that this has nothing to do with the network file systems NFS
 338           or Coda; you can say N here even if you intend to use NFS or Coda.
 339
 340           To compile this driver as a module, choose M here: the
 341           module will be called nbd.
 342
 343           If unsure, say N.
 344
 345 config BLK_DEV_SX8
 346         tristate "Promise SATA SX8 support"
 347         depends on PCI
 348         ---help---
 349           Saying Y or M here will enable support for the
 350           Promise SATA SX8 controllers.
 351
 352           Use devices /dev/sx8/$N and /dev/sx8/$Np$M.
 353
 354 config BLK_DEV_UB
 355         tristate "Low Performance USB Block driver"
 356         depends on USB
 357         help
 358           This driver supports certain USB attached storage devices
 359           such as flash keys.
 360
 361           Warning: Enabling this cripples the usb-storage driver.
 362
 363           If unsure, say N.
 364
 365 config BLK_DEV_RAM
 366         tristate "RAM disk support"
 367         ---help---
 368           Saying Y here will allow you to use a portion of your RAM memory as
 369           a block device, so that you can make file systems on it, read and
 370           write to it and do all the other things that you can do with normal
 371           block devices (such as hard drives). It is usually used to load and
 372           store a copy of a minimal root file system off of a floppy into RAM
 373           during the initial install of Linux.
 374
 375           Note that the kernel command line option "ramdisk=XX" is now
 376           obsolete. For details, read <file:Documentation/ramdisk.txt>.
 377
 378           To compile this driver as a module, choose M here: the
 379           module will be called rd.
 380
 381           Most normal users won't need the RAM disk functionality, and can
 382           thus say N here.
 383
 384 config BLK_DEV_RAM_COUNT
 385         int "Default number of RAM disks" if BLK_DEV_RAM
 386         default "16"
 387         help
 388           The default value is 16 RAM disks. Change this if you know what
 389           are doing. If you boot from a filesystem that needs to be extracted
 390           in memory, you will need at least one RAM disk (e.g. root on cramfs).
 391
 392 config BLK_DEV_RAM_SIZE
 393         int "Default RAM disk size (kbytes)"
 394         depends on BLK_DEV_RAM
 395         default "4096"
 396         help
 397           The default value is 4096 kilobytes. Only change this if you know
 398           what are you doing. If you are using IBM S/390, then set this to
 399           8192.
 400
 401 config BLK_DEV_INITRD
 402         bool "Initial RAM disk (initrd) support"
 403         depends on BLK_DEV_RAM=y
 404         help
 405           The initial RAM disk is a RAM disk that is loaded by the boot loader
 406           (loadlin or lilo) and that is mounted as root before the normal boot
 407           procedure. It is typically used to load modules needed to mount the
 408           "real" root file system, etc. See <file:Documentation/initrd.txt>
 409           for details.
 410
 411 config INITRAMFS_SOURCE
 412         string "Initramfs source file(s)"
 413         default ""
 414         help
 415           This can be either a single cpio archive with a .cpio suffix or a
 416           space-separated list of directories and files for building the
 417           initramfs image.  A cpio archive should contain a filesystem archive
 418           to be used as an initramfs image.  Directories should contain a
 419           filesystem layout to be included in the initramfs image.  Files
 420           should contain entries according to the format described by the
 421           "usr/gen_init_cpio" program in the kernel tree.
 422
 423           When multiple directories and files are specified then the
 424           initramfs image will be the aggregate of all of them.
 425
 426           See <file:Documentation/early-userspace/README for more details.
 427
 428           If you are not sure, leave it blank.
 429
 430 config INITRAMFS_ROOT_UID
 431         int "User ID to map to 0 (user root)"
 432         depends on INITRAMFS_SOURCE!=""
 433         default "0"
 434         help
 435           This setting is only meaningful if the INITRAMFS_SOURCE is
 436           contains a directory.  Setting this user ID (UID) to something
 437           other than "0" will cause all files owned by that UID to be
 438           owned by user root in the initial ramdisk image.
 439
 440           If you are not sure, leave it set to "0".
 441
 442 config INITRAMFS_ROOT_GID
 443         int "Group ID to map to 0 (group root)"
 444         depends on INITRAMFS_SOURCE!=""
 445         default "0"
 446         help
 447           This setting is only meaningful if the INITRAMFS_SOURCE is
 448           contains a directory.  Setting this group ID (GID) to something
 449           other than "0" will cause all files owned by that GID to be
 450           owned by group root in the initial ramdisk image.
 451
 452           If you are not sure, leave it set to "0".
 453
 454 #XXX - it makes sense to enable this only for 32-bit subarch's, not for x86_64
 455 #for instance.
 456 config LBD
 457         bool "Support for Large Block Devices"
 458         depends on X86 || MIPS32 || PPC32 || ARCH_S390_31 || SUPERH || UML
 459         help
 460           Say Y here if you want to attach large (bigger than 2TB) discs to
 461           your machine, or if you want to have a raid or loopback device
 462           bigger than 2TB.  Otherwise say N.
 463
 464 config CDROM_PKTCDVD
 465         tristate "Packet writing on CD/DVD media"
 466         depends on !UML
 467         help
 468           If you have a CDROM drive that supports packet writing, say Y to
 469           include preliminary support. It should work with any MMC/Mt Fuji
 470           compliant ATAPI or SCSI drive, which is just about any newer CD
 471           writer.
 472
 473           Currently only writing to CD-RW, DVD-RW and DVD+RW discs is possible.
 474           DVD-RW disks must be in restricted overwrite mode.
 475
 476           To compile this driver as a module, choose M here: the
 477           module will be called pktcdvd.
 478
 479 config CDROM_PKTCDVD_BUFFERS
 480         int "Free buffers for data gathering"
 481         depends on CDROM_PKTCDVD
 482         default "8"
 483         help
 484           This controls the maximum number of active concurrent packets. More
 485           concurrent packets can increase write performance, but also require
 486           more memory. Each concurrent packet will require approximately 64Kb
 487           of non-swappable kernel memory, memory which will be allocated at
 488           pktsetup time.
 489
 490 config CDROM_PKTCDVD_WCACHE
 491         bool "Enable write caching"
 492         depends on CDROM_PKTCDVD
 493         help
 494           If enabled, write caching will be set for the CD-R/W device. For now
 495           this option is dangerous unless the CD-RW media is known good, as we
 496           don't do deferred write error handling yet.
 497
 498 source "drivers/s390/block/Kconfig"
 499
 500 source "drivers/block/Kconfig.iosched"
 501
 502 config ATA_OVER_ETH
 503         tristate "ATA over Ethernet support"
 504         depends on NET
 505         help
 506         This driver provides Support for ATA over Ethernet block
 507         devices like the Coraid EtherDrive (R) Storage Blade.
 508
 509 endmenu