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 "SEGA Dreamcast GD-ROM drive"
68 depends on SH_DREAMCAST
70 A standard SEGA Dreamcast comes with a modified CD ROM drive called a
71 "GD-ROM" by SEGA to signify it is capable of reading special disks
72 with up to 1 GB of data. This drive will also read standard CD ROM
73 disks. Select this option to access any disks in your GD ROM drive.
74 Most users will want to say "Y" here.
75 You can also build this as a module which will be called gdrom.
78 tristate "Parallel port IDE device support"
81 There are many external CD-ROM and disk devices that connect through
82 your computer's parallel port. Most of them are actually IDE devices
83 using a parallel port IDE adapter. This option enables the PARIDE
84 subsystem which contains drivers for many of these external drives.
85 Read <file:Documentation/blockdev/paride.txt> for more information.
87 If you have said Y to the "Parallel-port support" configuration
88 option, you may share a single port between your printer and other
89 parallel port devices. Answer Y to build PARIDE support into your
90 kernel, or M if you would like to build it as a loadable module. If
91 your parallel port support is in a loadable module, you must build
92 PARIDE as a module. If you built PARIDE support into your kernel,
93 you may still build the individual protocol modules and high-level
94 drivers as loadable modules. If you build this support as a module,
95 it will be called paride.
97 To use the PARIDE support, you must say Y or M here and also to at
98 least one high-level driver (e.g. "Parallel port IDE disks",
99 "Parallel port ATAPI CD-ROMs", "Parallel port ATAPI disks" etc.) and
100 to at least one protocol driver (e.g. "ATEN EH-100 protocol",
101 "MicroSolutions backpack protocol", "DataStor Commuter protocol"
104 source "drivers/block/paride/Kconfig"
106 source "drivers/block/mtip32xx/Kconfig"
109 tristate "Compaq SMART2 support"
110 depends on PCI && VIRT_TO_BUS
112 This is the driver for Compaq Smart Array controllers. Everyone
113 using these boards should say Y here. See the file
114 <file:Documentation/blockdev/cpqarray.txt> for the current list of
115 boards supported by this driver, and for further information on the
118 config BLK_CPQ_CISS_DA
119 tristate "Compaq Smart Array 5xxx support"
121 select CHECK_SIGNATURE
123 This is the driver for Compaq Smart Array 5xxx controllers.
124 Everyone using these boards should say Y here.
125 See <file:Documentation/blockdev/cciss.txt> for the current list of
126 boards supported by this driver, and for further information
127 on the use of this driver.
129 config CISS_SCSI_TAPE
130 bool "SCSI tape drive support for Smart Array 5xxx"
131 depends on BLK_CPQ_CISS_DA && PROC_FS
132 depends on SCSI=y || SCSI=BLK_CPQ_CISS_DA
134 When enabled (Y), this option allows SCSI tape drives and SCSI medium
135 changers (tape robots) to be accessed via a Compaq 5xxx array
136 controller. (See <file:Documentation/blockdev/cciss.txt> for more details.)
138 "SCSI support" and "SCSI tape support" must also be enabled for this
141 When this option is disabled (N), the SCSI portion of the driver
144 config BLK_DEV_DAC960
145 tristate "Mylex DAC960/DAC1100 PCI RAID Controller support"
148 This driver adds support for the Mylex DAC960, AcceleRAID, and
149 eXtremeRAID PCI RAID controllers. See the file
150 <file:Documentation/blockdev/README.DAC960> for further information
153 To compile this driver as a module, choose M here: the
154 module will be called DAC960.
157 tristate "Micro Memory MM5415 Battery Backed RAM support"
160 Saying Y here will include support for the MM5415 family of
161 battery backed (Non-volatile) RAM cards.
162 <http://www.umem.com/>
164 The cards appear as block devices that can be partitioned into
165 as many as 15 partitions.
167 To compile this driver as a module, choose M here: the
168 module will be called umem.
170 The umem driver has not yet been allocated a MAJOR number, so
171 one is chosen dynamically.
174 bool "Virtual block device"
177 The User-Mode Linux port includes a driver called UBD which will let
178 you access arbitrary files on the host computer as block devices.
179 Unless you know that you do not need such virtual block devices say
182 config BLK_DEV_UBD_SYNC
183 bool "Always do synchronous disk IO for UBD"
184 depends on BLK_DEV_UBD
186 Writes to the virtual block device are not immediately written to the
187 host's disk; this may cause problems if, for example, the User-Mode
188 Linux 'Virtual Machine' uses a journalling filesystem and the host
191 Synchronous operation (i.e. always writing data to the host's disk
192 immediately) is configurable on a per-UBD basis by using a special
193 kernel command line option. Alternatively, you can say Y here to
194 turn on synchronous operation by default for all block devices.
196 If you're running a journalling file system (like reiserfs, for
197 example) in your virtual machine, you will want to say Y here. If
198 you care for the safety of the data in your virtual machine, Y is a
199 wise choice too. In all other cases (for example, if you're just
200 playing around with User-Mode Linux) you can choose N.
202 config BLK_DEV_COW_COMMON
207 tristate "Loopback device support"
209 Saying Y here will allow you to use a regular file as a block
210 device; you can then create a file system on that block device and
211 mount it just as you would mount other block devices such as hard
212 drive partitions, CD-ROM drives or floppy drives. The loop devices
213 are block special device files with major number 7 and typically
214 called /dev/loop0, /dev/loop1 etc.
216 This is useful if you want to check an ISO 9660 file system before
217 burning the CD, or if you want to use floppy images without first
218 writing them to floppy. Furthermore, some Linux distributions avoid
219 the need for a dedicated Linux partition by keeping their complete
220 root file system inside a DOS FAT file using this loop device
223 To use the loop device, you need the losetup utility, found in the
224 util-linux package, see
225 <ftp://ftp.kernel.org/pub/linux/utils/util-linux/>.
227 The loop device driver can also be used to "hide" a file system in
228 a disk partition, floppy, or regular file, either using encryption
229 (scrambling the data) or steganography (hiding the data in the low
230 bits of, say, a sound file). This is also safe if the file resides
231 on a remote file server.
233 There are several ways of encrypting disks. Some of these require
234 kernel patches. The vanilla kernel offers the cryptoloop option
235 and a Device Mapper target (which is superior, as it supports all
236 file systems). If you want to use the cryptoloop, say Y to both
237 LOOP and CRYPTOLOOP, and make sure you have a recent (version 2.12
238 or later) version of util-linux. Additionally, be aware that
239 the cryptoloop is not safe for storing journaled filesystems.
241 Note that this loop device has nothing to do with the loopback
242 device used for network connections from the machine to itself.
244 To compile this driver as a module, choose M here: the
245 module will be called loop.
247 Most users will answer N here.
249 config BLK_DEV_LOOP_MIN_COUNT
250 int "Number of loop devices to pre-create at init time"
251 depends on BLK_DEV_LOOP
254 Static number of loop devices to be unconditionally pre-created
257 This default value can be overwritten on the kernel command
258 line or with module-parameter loop.max_loop.
260 The historic default is 8. If a late 2011 version of losetup(8)
261 is used, it can be set to 0, since needed loop devices can be
262 dynamically allocated with the /dev/loop-control interface.
264 config BLK_DEV_CRYPTOLOOP
265 tristate "Cryptoloop Support"
268 depends on BLK_DEV_LOOP
270 Say Y here if you want to be able to use the ciphers that are
271 provided by the CryptoAPI as loop transformation. This might be
272 used as hard disk encryption.
274 WARNING: This device is not safe for journaled file systems like
275 ext3 or Reiserfs. Please use the Device Mapper crypto module
276 instead, which can be configured to be on-disk compatible with the
279 source "drivers/block/drbd/Kconfig"
282 tristate "Network block device support"
285 Saying Y here will allow your computer to be a client for network
286 block devices, i.e. it will be able to use block devices exported by
287 servers (mount file systems on them etc.). Communication between
288 client and server works over TCP/IP networking, but to the client
289 program this is hidden: it looks like a regular local file access to
290 a block device special file such as /dev/nd0.
292 Network block devices also allows you to run a block-device in
293 userland (making server and client physically the same computer,
294 communicating using the loopback network device).
296 Read <file:Documentation/blockdev/nbd.txt> for more information,
297 especially about where to find the server code, which runs in user
298 space and does not need special kernel support.
300 Note that this has nothing to do with the network file systems NFS
301 or Coda; you can say N here even if you intend to use NFS or Coda.
303 To compile this driver as a module, choose M here: the
304 module will be called nbd.
309 tristate "NVM Express block device"
312 The NVM Express driver is for solid state drives directly
313 connected to the PCI or PCI Express bus. If you know you
314 don't have one of these, it is safe to answer N.
316 To compile this driver as a module, choose M here: the
317 module will be called nvme.
320 tristate "OSD object-as-blkdev support"
321 depends on SCSI_OSD_ULD
323 Saying Y or M here will allow the exporting of a single SCSI
324 OSD (object-based storage) object as a Linux block device.
326 For example, if you create a 2G object on an OSD device,
327 you can then use this module to present that 2G object as
328 a Linux block device.
330 To compile this driver as a module, choose M here: the
331 module will be called osdblk.
336 tristate "Promise SATA SX8 support"
339 Saying Y or M here will enable support for the
340 Promise SATA SX8 controllers.
342 Use devices /dev/sx8/$N and /dev/sx8/$Np$M.
345 tristate "RAM block device support"
347 Saying Y here will allow you to use a portion of your RAM memory as
348 a block device, so that you can make file systems on it, read and
349 write to it and do all the other things that you can do with normal
350 block devices (such as hard drives). It is usually used to load and
351 store a copy of a minimal root file system off of a floppy into RAM
352 during the initial install of Linux.
354 Note that the kernel command line option "ramdisk=XX" is now obsolete.
355 For details, read <file:Documentation/blockdev/ramdisk.txt>.
357 To compile this driver as a module, choose M here: the
358 module will be called rd.
360 Most normal users won't need the RAM disk functionality, and can
363 config BLK_DEV_RAM_COUNT
364 int "Default number of RAM disks"
366 depends on BLK_DEV_RAM
368 The default value is 16 RAM disks. Change this if you know what you
369 are doing. If you boot from a filesystem that needs to be extracted
370 in memory, you will need at least one RAM disk (e.g. root on cramfs).
372 config BLK_DEV_RAM_SIZE
373 int "Default RAM disk size (kbytes)"
374 depends on BLK_DEV_RAM
377 The default value is 4096 kilobytes. Only change this if you know
381 bool "Support XIP filesystems on RAM block device"
382 depends on BLK_DEV_RAM
385 Support XIP filesystems (such as ext2 with XIP support on) on
386 top of block ram device. This will slightly enlarge the kernel, and
387 will prevent RAM block device backing store memory from being
388 allocated from highmem (only a problem for highmem systems).
391 tristate "Packet writing on CD/DVD media"
394 If you have a CDROM/DVD drive that supports packet writing, say
395 Y to include support. It should work with any MMC/Mt Fuji
396 compliant ATAPI or SCSI drive, which is just about any newer
399 Currently only writing to CD-RW, DVD-RW, DVD+RW and DVDRAM discs
401 DVD-RW disks must be in restricted overwrite mode.
403 See the file <file:Documentation/cdrom/packet-writing.txt>
404 for further information on the use of this driver.
406 To compile this driver as a module, choose M here: the
407 module will be called pktcdvd.
409 config CDROM_PKTCDVD_BUFFERS
410 int "Free buffers for data gathering"
411 depends on CDROM_PKTCDVD
414 This controls the maximum number of active concurrent packets. More
415 concurrent packets can increase write performance, but also require
416 more memory. Each concurrent packet will require approximately 64Kb
417 of non-swappable kernel memory, memory which will be allocated when
418 a disc is opened for writing.
420 config CDROM_PKTCDVD_WCACHE
421 bool "Enable write caching"
422 depends on CDROM_PKTCDVD
424 If enabled, write caching will be set for the CD-R/W device. For now
425 this option is dangerous unless the CD-RW media is known good, as we
426 don't do deferred write error handling yet.
429 tristate "ATA over Ethernet support"
432 This driver provides Support for ATA over Ethernet block
433 devices like the Coraid EtherDrive (R) Storage Blade.
436 tristate "mGine mflash, gflash support"
437 depends on ARM && GPIOLIB
439 mGine mFlash(gFlash) block device driver
442 int "Size of reserved area before MBR"
446 Define size of reserved area that usually used for boot. Unit is KB.
447 All of the block device operation will be taken this value as start
453 tristate "Sun Virtual Disk Client support"
456 Support for virtual disk devices as a client under Sun
459 source "drivers/s390/block/Kconfig"
462 tristate "Xilinx SystemACE support"
463 depends on 4xx || MICROBLAZE
465 Include support for the Xilinx SystemACE CompactFlash interface
467 config XEN_BLKDEV_FRONTEND
468 tristate "Xen virtual block device support"
471 select XEN_XENBUS_FRONTEND
473 This driver implements the front-end of the Xen virtual
474 block device driver. It communicates with a back-end driver
475 in another domain which drives the actual block device.
477 config XEN_BLKDEV_BACKEND
478 tristate "Xen block-device backend driver"
479 depends on XEN_BACKEND
481 The block-device backend driver allows the kernel to export its
482 block devices to other guests via a high-performance shared-memory
485 The corresponding Linux frontend driver is enabled by the
486 CONFIG_XEN_BLKDEV_FRONTEND configuration option.
488 The backend driver attaches itself to a any block device specified
489 in the XenBus configuration. There are no limits to what the block
490 device as long as it has a major and minor.
492 If you are compiling a kernel to run in a Xen block backend driver
493 domain (often this is domain 0) you should say Y here. To
494 compile this driver as a module, chose M here: the module
495 will be called xen-blkback.
499 tristate "Virtio block driver"
502 This is the virtual block driver for virtio. It can be used with
503 lguest or QEMU based VMMs (like KVM or Xen). Say Y or M.
506 bool "Very old hard disk (MFM/RLL/IDE) driver"
508 depends on !ARM || ARCH_RPC || ARCH_SHARK || BROKEN
510 This is a very old hard disk driver that lacks the enhanced
511 functionality of the newer ones.
513 It is required for systems with ancient MFM/RLL/ESDI drives.
518 tristate "Rados block device (RBD)"
519 depends on INET && BLOCK
526 Say Y here if you want include the Rados block device, which stripes
527 a block device over objects stored in the Ceph distributed object
530 More information at http://ceph.newdream.net/.
535 tristate "IBM FlashSystem 70/80 PCIe SSD Device Driver"
538 Device driver for IBM's high speed PCIe SSD
539 storage devices: FlashSystem-70 and FlashSystem-80.
541 To compile this driver as a module, choose M here: the
542 module will be called rsxx.