2 # Block device driver configuration
10 Say Y here to get to see options for various different block device
11 drivers. This option alone does not add any kernel code.
13 If you say N, all options in this submenu will be skipped and disabled;
14 only do this if you know what you are doing.
19 tristate "Normal floppy disk support"
20 depends on ARCH_MAY_HAVE_PC_FDC
22 If you want to use the floppy disk drive(s) of your PC under Linux,
23 say Y. Information about this driver, especially important for IBM
24 Thinkpad users, is contained in
25 <file:Documentation/blockdev/floppy.txt>.
26 That file also contains the location of the Floppy driver FAQ as
27 well as location of the fdutils package used to configure additional
28 parameters of the driver at run time.
30 To compile this driver as a module, choose M here: the
31 module will be called floppy.
34 tristate "Amiga floppy support"
38 tristate "Atari floppy support"
42 tristate "Support for PowerMac floppy"
43 depends on PPC_PMAC && !PPC_PMAC64
45 If you have a SWIM-3 (Super Woz Integrated Machine 3; from Apple)
46 floppy controller, say Y here. Most commonly found in PowerMacs.
49 tristate "Support for SWIM Macintosh floppy"
50 depends on M68K && MAC
52 You should select this option if you want floppy support
53 and you don't have a II, IIfx, Q900, Q950 or AV series.
56 tristate "Amiga Zorro II ramdisk support"
59 This enables support for using Chip RAM and Zorro II RAM as a
60 ramdisk or as a swap partition. Say Y if you want to include this
63 To compile this driver as a module, choose M here: the
64 module will be called z2ram.
67 tristate "XT hard disk support"
68 depends on ISA && ISA_DMA_API
69 select CHECK_SIGNATURE
71 Very old 8 bit hard disk controllers used in the IBM XT computer
72 will be supported if you say Y here.
74 To compile this driver as a module, choose M here: the
75 module will be called xd.
77 It's pretty unlikely that you have one of these: say N.
80 tristate "SEGA Dreamcast GD-ROM drive"
81 depends on SH_DREAMCAST
83 A standard SEGA Dreamcast comes with a modified CD ROM drive called a
84 "GD-ROM" by SEGA to signify it is capable of reading special disks
85 with up to 1 GB of data. This drive will also read standard CD ROM
86 disks. Select this option to access any disks in your GD ROM drive.
87 Most users will want to say "Y" here.
88 You can also build this as a module which will be called gdrom.
91 tristate "Parallel port IDE device support"
94 There are many external CD-ROM and disk devices that connect through
95 your computer's parallel port. Most of them are actually IDE devices
96 using a parallel port IDE adapter. This option enables the PARIDE
97 subsystem which contains drivers for many of these external drives.
98 Read <file:Documentation/blockdev/paride.txt> for more information.
100 If you have said Y to the "Parallel-port support" configuration
101 option, you may share a single port between your printer and other
102 parallel port devices. Answer Y to build PARIDE support into your
103 kernel, or M if you would like to build it as a loadable module. If
104 your parallel port support is in a loadable module, you must build
105 PARIDE as a module. If you built PARIDE support into your kernel,
106 you may still build the individual protocol modules and high-level
107 drivers as loadable modules. If you build this support as a module,
108 it will be called paride.
110 To use the PARIDE support, you must say Y or M here and also to at
111 least one high-level driver (e.g. "Parallel port IDE disks",
112 "Parallel port ATAPI CD-ROMs", "Parallel port ATAPI disks" etc.) and
113 to at least one protocol driver (e.g. "ATEN EH-100 protocol",
114 "MicroSolutions backpack protocol", "DataStor Commuter protocol"
117 source "drivers/block/paride/Kconfig"
120 tristate "Compaq SMART2 support"
121 depends on PCI && VIRT_TO_BUS
123 This is the driver for Compaq Smart Array controllers. Everyone
124 using these boards should say Y here. See the file
125 <file:Documentation/blockdev/cpqarray.txt> for the current list of
126 boards supported by this driver, and for further information on the
129 config BLK_CPQ_CISS_DA
130 tristate "Compaq Smart Array 5xxx support"
133 This is the driver for Compaq Smart Array 5xxx controllers.
134 Everyone using these boards should say Y here.
135 See <file:Documentation/blockdev/cciss.txt> for the current list of
136 boards supported by this driver, and for further information
137 on the use of this driver.
139 config CISS_SCSI_TAPE
140 bool "SCSI tape drive support for Smart Array 5xxx"
141 depends on BLK_CPQ_CISS_DA && PROC_FS
142 depends on SCSI=y || SCSI=BLK_CPQ_CISS_DA
144 When enabled (Y), this option allows SCSI tape drives and SCSI medium
145 changers (tape robots) to be accessed via a Compaq 5xxx array
146 controller. (See <file:Documentation/blockdev/cciss.txt> for more details.)
148 "SCSI support" and "SCSI tape support" must also be enabled for this
151 When this option is disabled (N), the SCSI portion of the driver
154 config BLK_DEV_DAC960
155 tristate "Mylex DAC960/DAC1100 PCI RAID Controller support"
158 This driver adds support for the Mylex DAC960, AcceleRAID, and
159 eXtremeRAID PCI RAID controllers. See the file
160 <file:Documentation/blockdev/README.DAC960> for further information
163 To compile this driver as a module, choose M here: the
164 module will be called DAC960.
167 tristate "Micro Memory MM5415 Battery Backed RAM support (EXPERIMENTAL)"
168 depends on PCI && EXPERIMENTAL
170 Saying Y here will include support for the MM5415 family of
171 battery backed (Non-volatile) RAM cards.
172 <http://www.umem.com/>
174 The cards appear as block devices that can be partitioned into
175 as many as 15 partitions.
177 To compile this driver as a module, choose M here: the
178 module will be called umem.
180 The umem driver has not yet been allocated a MAJOR number, so
181 one is chosen dynamically.
184 bool "Virtual block device"
187 The User-Mode Linux port includes a driver called UBD which will let
188 you access arbitrary files on the host computer as block devices.
189 Unless you know that you do not need such virtual block devices say
192 config BLK_DEV_UBD_SYNC
193 bool "Always do synchronous disk IO for UBD"
194 depends on BLK_DEV_UBD
196 Writes to the virtual block device are not immediately written to the
197 host's disk; this may cause problems if, for example, the User-Mode
198 Linux 'Virtual Machine' uses a journalling filesystem and the host
201 Synchronous operation (i.e. always writing data to the host's disk
202 immediately) is configurable on a per-UBD basis by using a special
203 kernel command line option. Alternatively, you can say Y here to
204 turn on synchronous operation by default for all block devices.
206 If you're running a journalling file system (like reiserfs, for
207 example) in your virtual machine, you will want to say Y here. If
208 you care for the safety of the data in your virtual machine, Y is a
209 wise choice too. In all other cases (for example, if you're just
210 playing around with User-Mode Linux) you can choose N.
212 config BLK_DEV_COW_COMMON
217 tristate "Loopback device support"
219 Saying Y here will allow you to use a regular file as a block
220 device; you can then create a file system on that block device and
221 mount it just as you would mount other block devices such as hard
222 drive partitions, CD-ROM drives or floppy drives. The loop devices
223 are block special device files with major number 7 and typically
224 called /dev/loop0, /dev/loop1 etc.
226 This is useful if you want to check an ISO 9660 file system before
227 burning the CD, or if you want to use floppy images without first
228 writing them to floppy. Furthermore, some Linux distributions avoid
229 the need for a dedicated Linux partition by keeping their complete
230 root file system inside a DOS FAT file using this loop device
233 To use the loop device, you need the losetup utility, found in the
234 util-linux package, see
235 <ftp://ftp.kernel.org/pub/linux/utils/util-linux/>.
237 The loop device driver can also be used to "hide" a file system in
238 a disk partition, floppy, or regular file, either using encryption
239 (scrambling the data) or steganography (hiding the data in the low
240 bits of, say, a sound file). This is also safe if the file resides
241 on a remote file server.
243 There are several ways of encrypting disks. Some of these require
244 kernel patches. The vanilla kernel offers the cryptoloop option
245 and a Device Mapper target (which is superior, as it supports all
246 file systems). If you want to use the cryptoloop, say Y to both
247 LOOP and CRYPTOLOOP, and make sure you have a recent (version 2.12
248 or later) version of util-linux. Additionally, be aware that
249 the cryptoloop is not safe for storing journaled filesystems.
251 Note that this loop device has nothing to do with the loopback
252 device used for network connections from the machine to itself.
254 To compile this driver as a module, choose M here: the
255 module will be called loop.
257 Most users will answer N here.
259 config BLK_DEV_LOOP_MIN_COUNT
260 int "Number of loop devices to pre-create at init time"
261 depends on BLK_DEV_LOOP
264 Static number of loop devices to be unconditionally pre-created
267 This default value can be overwritten on the kernel command
268 line or with module-parameter loop.max_loop.
270 The historic default is 8. If a late 2011 version of losetup(8)
271 is used, it can be set to 0, since needed loop devices can be
272 dynamically allocated with the /dev/loop-control interface.
274 config BLK_DEV_CRYPTOLOOP
275 tristate "Cryptoloop Support"
278 depends on BLK_DEV_LOOP
280 Say Y here if you want to be able to use the ciphers that are
281 provided by the CryptoAPI as loop transformation. This might be
282 used as hard disk encryption.
284 WARNING: This device is not safe for journaled file systems like
285 ext3 or Reiserfs. Please use the Device Mapper crypto module
286 instead, which can be configured to be on-disk compatible with the
289 source "drivers/block/drbd/Kconfig"
292 tristate "Network block device support"
295 Saying Y here will allow your computer to be a client for network
296 block devices, i.e. it will be able to use block devices exported by
297 servers (mount file systems on them etc.). Communication between
298 client and server works over TCP/IP networking, but to the client
299 program this is hidden: it looks like a regular local file access to
300 a block device special file such as /dev/nd0.
302 Network block devices also allows you to run a block-device in
303 userland (making server and client physically the same computer,
304 communicating using the loopback network device).
306 Read <file:Documentation/blockdev/nbd.txt> for more information,
307 especially about where to find the server code, which runs in user
308 space and does not need special kernel support.
310 Note that this has nothing to do with the network file systems NFS
311 or Coda; you can say N here even if you intend to use NFS or Coda.
313 To compile this driver as a module, choose M here: the
314 module will be called nbd.
319 tristate "OSD object-as-blkdev support"
320 depends on SCSI_OSD_ULD
322 Saying Y or M here will allow the exporting of a single SCSI
323 OSD (object-based storage) object as a Linux block device.
325 For example, if you create a 2G object on an OSD device,
326 you can then use this module to present that 2G object as
327 a Linux block device.
329 To compile this driver as a module, choose M here: the
330 module will be called osdblk.
335 tristate "Promise SATA SX8 support"
338 Saying Y or M here will enable support for the
339 Promise SATA SX8 controllers.
341 Use devices /dev/sx8/$N and /dev/sx8/$Np$M.
344 tristate "Low Performance USB Block driver"
347 This driver supports certain USB attached storage devices
350 If you enable this driver, it is recommended to avoid conflicts
351 with usb-storage by enabling USB_LIBUSUAL.
356 tristate "RAM block device support"
358 Saying Y here will allow you to use a portion of your RAM memory as
359 a block device, so that you can make file systems on it, read and
360 write to it and do all the other things that you can do with normal
361 block devices (such as hard drives). It is usually used to load and
362 store a copy of a minimal root file system off of a floppy into RAM
363 during the initial install of Linux.
365 Note that the kernel command line option "ramdisk=XX" is now obsolete.
366 For details, read <file:Documentation/blockdev/ramdisk.txt>.
368 To compile this driver as a module, choose M here: the
369 module will be called rd.
371 Most normal users won't need the RAM disk functionality, and can
374 config BLK_DEV_RAM_COUNT
375 int "Default number of RAM disks"
377 depends on BLK_DEV_RAM
379 The default value is 16 RAM disks. Change this if you know what you
380 are doing. If you boot from a filesystem that needs to be extracted
381 in memory, you will need at least one RAM disk (e.g. root on cramfs).
383 config BLK_DEV_RAM_SIZE
384 int "Default RAM disk size (kbytes)"
385 depends on BLK_DEV_RAM
388 The default value is 4096 kilobytes. Only change this if you know
392 bool "Support XIP filesystems on RAM block device"
393 depends on BLK_DEV_RAM
396 Support XIP filesystems (such as ext2 with XIP support on) on
397 top of block ram device. This will slightly enlarge the kernel, and
398 will prevent RAM block device backing store memory from being
399 allocated from highmem (only a problem for highmem systems).
402 tristate "Packet writing on CD/DVD media"
405 If you have a CDROM/DVD drive that supports packet writing, say
406 Y to include support. It should work with any MMC/Mt Fuji
407 compliant ATAPI or SCSI drive, which is just about any newer
410 Currently only writing to CD-RW, DVD-RW, DVD+RW and DVDRAM discs
412 DVD-RW disks must be in restricted overwrite mode.
414 See the file <file:Documentation/cdrom/packet-writing.txt>
415 for further information on the use of this driver.
417 To compile this driver as a module, choose M here: the
418 module will be called pktcdvd.
420 config CDROM_PKTCDVD_BUFFERS
421 int "Free buffers for data gathering"
422 depends on CDROM_PKTCDVD
425 This controls the maximum number of active concurrent packets. More
426 concurrent packets can increase write performance, but also require
427 more memory. Each concurrent packet will require approximately 64Kb
428 of non-swappable kernel memory, memory which will be allocated when
429 a disc is opened for writing.
431 config CDROM_PKTCDVD_WCACHE
432 bool "Enable write caching (EXPERIMENTAL)"
433 depends on CDROM_PKTCDVD && EXPERIMENTAL
435 If enabled, write caching will be set for the CD-R/W device. For now
436 this option is dangerous unless the CD-RW media is known good, as we
437 don't do deferred write error handling yet.
440 tristate "ATA over Ethernet support"
443 This driver provides Support for ATA over Ethernet block
444 devices like the Coraid EtherDrive (R) Storage Blade.
447 tristate "mGine mflash, gflash support"
448 depends on ARM && GPIOLIB
450 mGine mFlash(gFlash) block device driver
453 int "Size of reserved area before MBR"
457 Define size of reserved area that usually used for boot. Unit is KB.
458 All of the block device operation will be taken this value as start
464 tristate "Sun Virtual Disk Client support"
467 Support for virtual disk devices as a client under Sun
470 source "drivers/s390/block/Kconfig"
473 tristate "Xilinx SystemACE support"
474 depends on 4xx || MICROBLAZE
476 Include support for the Xilinx SystemACE CompactFlash interface
478 config XEN_BLKDEV_FRONTEND
479 tristate "Xen virtual block device support"
482 select XEN_XENBUS_FRONTEND
484 This driver implements the front-end of the Xen virtual
485 block device driver. It communicates with a back-end driver
486 in another domain which drives the actual block device.
488 config XEN_BLKDEV_BACKEND
489 tristate "Xen block-device backend driver"
490 depends on XEN_BACKEND
492 The block-device backend driver allows the kernel to export its
493 block devices to other guests via a high-performance shared-memory
496 The corresponding Linux frontend driver is enabled by the
497 CONFIG_XEN_BLKDEV_FRONTEND configuration option.
499 The backend driver attaches itself to a any block device specified
500 in the XenBus configuration. There are no limits to what the block
501 device as long as it has a major and minor.
503 If you are compiling a kernel to run in a Xen block backend driver
504 domain (often this is domain 0) you should say Y here. To
505 compile this driver as a module, chose M here: the module
506 will be called xen-blkback.
510 tristate "Virtio block driver (EXPERIMENTAL)"
511 depends on EXPERIMENTAL && VIRTIO
513 This is the virtual block driver for virtio. It can be used with
514 lguest or QEMU based VMMs (like KVM or Xen). Say Y or M.
517 bool "Very old hard disk (MFM/RLL/IDE) driver"
519 depends on !ARM || ARCH_RPC || ARCH_SHARK || BROKEN
521 This is a very old hard disk driver that lacks the enhanced
522 functionality of the newer ones.
524 It is required for systems with ancient MFM/RLL/ESDI drives.
529 tristate "Rados block device (RBD)"
530 depends on INET && EXPERIMENTAL && BLOCK
537 Say Y here if you want include the Rados block device, which stripes
538 a block device over objects stored in the Ceph distributed object
541 More information at http://ceph.newdream.net/.