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.
18 config BLK_DEV_NULL_BLK
19 tristate "Null test block driver"
22 tristate "Normal floppy disk support"
23 depends on ARCH_MAY_HAVE_PC_FDC
25 If you want to use the floppy disk drive(s) of your PC under Linux,
26 say Y. Information about this driver, especially important for IBM
27 Thinkpad users, is contained in
28 <file:Documentation/blockdev/floppy.txt>.
29 That file also contains the location of the Floppy driver FAQ as
30 well as location of the fdutils package used to configure additional
31 parameters of the driver at run time.
33 To compile this driver as a module, choose M here: the
34 module will be called floppy.
37 tristate "Amiga floppy support"
41 tristate "Atari floppy support"
45 tristate "Support for PowerMac floppy"
46 depends on PPC_PMAC && !PPC_PMAC64
48 If you have a SWIM-3 (Super Woz Integrated Machine 3; from Apple)
49 floppy controller, say Y here. Most commonly found in PowerMacs.
52 tristate "Support for SWIM Macintosh floppy"
53 depends on M68K && MAC
55 You should select this option if you want floppy support
56 and you don't have a II, IIfx, Q900, Q950 or AV series.
59 tristate "Amiga Zorro II ramdisk support"
62 This enables support for using Chip RAM and Zorro II RAM as a
63 ramdisk or as a swap partition. Say Y if you want to include this
66 To compile this driver as a module, choose M here: the
67 module will be called z2ram.
70 tristate "SEGA Dreamcast GD-ROM drive"
71 depends on SH_DREAMCAST
73 A standard SEGA Dreamcast comes with a modified CD ROM drive called a
74 "GD-ROM" by SEGA to signify it is capable of reading special disks
75 with up to 1 GB of data. This drive will also read standard CD ROM
76 disks. Select this option to access any disks in your GD ROM drive.
77 Most users will want to say "Y" here.
78 You can also build this as a module which will be called gdrom.
81 tristate "Parallel port IDE device support"
84 There are many external CD-ROM and disk devices that connect through
85 your computer's parallel port. Most of them are actually IDE devices
86 using a parallel port IDE adapter. This option enables the PARIDE
87 subsystem which contains drivers for many of these external drives.
88 Read <file:Documentation/blockdev/paride.txt> for more information.
90 If you have said Y to the "Parallel-port support" configuration
91 option, you may share a single port between your printer and other
92 parallel port devices. Answer Y to build PARIDE support into your
93 kernel, or M if you would like to build it as a loadable module. If
94 your parallel port support is in a loadable module, you must build
95 PARIDE as a module. If you built PARIDE support into your kernel,
96 you may still build the individual protocol modules and high-level
97 drivers as loadable modules. If you build this support as a module,
98 it will be called paride.
100 To use the PARIDE support, you must say Y or M here and also to at
101 least one high-level driver (e.g. "Parallel port IDE disks",
102 "Parallel port ATAPI CD-ROMs", "Parallel port ATAPI disks" etc.) and
103 to at least one protocol driver (e.g. "ATEN EH-100 protocol",
104 "MicroSolutions backpack protocol", "DataStor Commuter protocol"
107 source "drivers/block/paride/Kconfig"
109 source "drivers/block/mtip32xx/Kconfig"
111 source "drivers/block/zram/Kconfig"
114 tristate "Compaq SMART2 support"
115 depends on PCI && VIRT_TO_BUS && 0
117 This is the driver for Compaq Smart Array controllers. Everyone
118 using these boards should say Y here. See the file
119 <file:Documentation/blockdev/cpqarray.txt> for the current list of
120 boards supported by this driver, and for further information on the
123 config BLK_CPQ_CISS_DA
124 tristate "Compaq Smart Array 5xxx support"
126 select CHECK_SIGNATURE
128 This is the driver for Compaq Smart Array 5xxx controllers.
129 Everyone using these boards should say Y here.
130 See <file:Documentation/blockdev/cciss.txt> for the current list of
131 boards supported by this driver, and for further information
132 on the use of this driver.
134 config CISS_SCSI_TAPE
135 bool "SCSI tape drive support for Smart Array 5xxx"
136 depends on BLK_CPQ_CISS_DA && PROC_FS
137 depends on SCSI=y || SCSI=BLK_CPQ_CISS_DA
139 When enabled (Y), this option allows SCSI tape drives and SCSI medium
140 changers (tape robots) to be accessed via a Compaq 5xxx array
141 controller. (See <file:Documentation/blockdev/cciss.txt> for more details.)
143 "SCSI support" and "SCSI tape support" must also be enabled for this
146 When this option is disabled (N), the SCSI portion of the driver
149 config BLK_DEV_DAC960
150 tristate "Mylex DAC960/DAC1100 PCI RAID Controller support"
153 This driver adds support for the Mylex DAC960, AcceleRAID, and
154 eXtremeRAID PCI RAID controllers. See the file
155 <file:Documentation/blockdev/README.DAC960> for further information
158 To compile this driver as a module, choose M here: the
159 module will be called DAC960.
162 tristate "Micro Memory MM5415 Battery Backed RAM support"
165 Saying Y here will include support for the MM5415 family of
166 battery backed (Non-volatile) RAM cards.
167 <http://www.umem.com/>
169 The cards appear as block devices that can be partitioned into
170 as many as 15 partitions.
172 To compile this driver as a module, choose M here: the
173 module will be called umem.
175 The umem driver has not yet been allocated a MAJOR number, so
176 one is chosen dynamically.
179 bool "Virtual block device"
182 The User-Mode Linux port includes a driver called UBD which will let
183 you access arbitrary files on the host computer as block devices.
184 Unless you know that you do not need such virtual block devices say
187 config BLK_DEV_UBD_SYNC
188 bool "Always do synchronous disk IO for UBD"
189 depends on BLK_DEV_UBD
191 Writes to the virtual block device are not immediately written to the
192 host's disk; this may cause problems if, for example, the User-Mode
193 Linux 'Virtual Machine' uses a journalling filesystem and the host
196 Synchronous operation (i.e. always writing data to the host's disk
197 immediately) is configurable on a per-UBD basis by using a special
198 kernel command line option. Alternatively, you can say Y here to
199 turn on synchronous operation by default for all block devices.
201 If you're running a journalling file system (like reiserfs, for
202 example) in your virtual machine, you will want to say Y here. If
203 you care for the safety of the data in your virtual machine, Y is a
204 wise choice too. In all other cases (for example, if you're just
205 playing around with User-Mode Linux) you can choose N.
207 config BLK_DEV_COW_COMMON
212 tristate "Loopback device support"
214 Saying Y here will allow you to use a regular file as a block
215 device; you can then create a file system on that block device and
216 mount it just as you would mount other block devices such as hard
217 drive partitions, CD-ROM drives or floppy drives. The loop devices
218 are block special device files with major number 7 and typically
219 called /dev/loop0, /dev/loop1 etc.
221 This is useful if you want to check an ISO 9660 file system before
222 burning the CD, or if you want to use floppy images without first
223 writing them to floppy. Furthermore, some Linux distributions avoid
224 the need for a dedicated Linux partition by keeping their complete
225 root file system inside a DOS FAT file using this loop device
228 To use the loop device, you need the losetup utility, found in the
229 util-linux package, see
230 <ftp://ftp.kernel.org/pub/linux/utils/util-linux/>.
232 The loop device driver can also be used to "hide" a file system in
233 a disk partition, floppy, or regular file, either using encryption
234 (scrambling the data) or steganography (hiding the data in the low
235 bits of, say, a sound file). This is also safe if the file resides
236 on a remote file server.
238 There are several ways of encrypting disks. Some of these require
239 kernel patches. The vanilla kernel offers the cryptoloop option
240 and a Device Mapper target (which is superior, as it supports all
241 file systems). If you want to use the cryptoloop, say Y to both
242 LOOP and CRYPTOLOOP, and make sure you have a recent (version 2.12
243 or later) version of util-linux. Additionally, be aware that
244 the cryptoloop is not safe for storing journaled filesystems.
246 Note that this loop device has nothing to do with the loopback
247 device used for network connections from the machine to itself.
249 To compile this driver as a module, choose M here: the
250 module will be called loop.
252 Most users will answer N here.
254 config BLK_DEV_LOOP_MIN_COUNT
255 int "Number of loop devices to pre-create at init time"
256 depends on BLK_DEV_LOOP
259 Static number of loop devices to be unconditionally pre-created
262 This default value can be overwritten on the kernel command
263 line or with module-parameter loop.max_loop.
265 The historic default is 8. If a late 2011 version of losetup(8)
266 is used, it can be set to 0, since needed loop devices can be
267 dynamically allocated with the /dev/loop-control interface.
269 config BLK_DEV_CRYPTOLOOP
270 tristate "Cryptoloop Support"
273 depends on BLK_DEV_LOOP
275 Say Y here if you want to be able to use the ciphers that are
276 provided by the CryptoAPI as loop transformation. This might be
277 used as hard disk encryption.
279 WARNING: This device is not safe for journaled file systems like
280 ext3 or Reiserfs. Please use the Device Mapper crypto module
281 instead, which can be configured to be on-disk compatible with the
284 source "drivers/block/drbd/Kconfig"
287 tristate "Network block device support"
290 Saying Y here will allow your computer to be a client for network
291 block devices, i.e. it will be able to use block devices exported by
292 servers (mount file systems on them etc.). Communication between
293 client and server works over TCP/IP networking, but to the client
294 program this is hidden: it looks like a regular local file access to
295 a block device special file such as /dev/nd0.
297 Network block devices also allows you to run a block-device in
298 userland (making server and client physically the same computer,
299 communicating using the loopback network device).
301 Read <file:Documentation/blockdev/nbd.txt> for more information,
302 especially about where to find the server code, which runs in user
303 space and does not need special kernel support.
305 Note that this has nothing to do with the network file systems NFS
306 or Coda; you can say N here even if you intend to use NFS or Coda.
308 To compile this driver as a module, choose M here: the
309 module will be called nbd.
314 tristate "NVM Express block device"
317 The NVM Express driver is for solid state drives directly
318 connected to the PCI or PCI Express bus. If you know you
319 don't have one of these, it is safe to answer N.
321 To compile this driver as a module, choose M here: the
322 module will be called nvme.
325 tristate "STEC S1120 Block Driver"
329 Saying Y or M here will enable support for the
330 STEC, Inc. S1120 PCIe SSD.
332 Use device /dev/skd$N amd /dev/skd$Np$M.
335 tristate "OSD object-as-blkdev support"
336 depends on SCSI_OSD_ULD
338 Saying Y or M here will allow the exporting of a single SCSI
339 OSD (object-based storage) object as a Linux block device.
341 For example, if you create a 2G object on an OSD device,
342 you can then use this module to present that 2G object as
343 a Linux block device.
345 To compile this driver as a module, choose M here: the
346 module will be called osdblk.
351 tristate "Promise SATA SX8 support"
354 Saying Y or M here will enable support for the
355 Promise SATA SX8 controllers.
357 Use devices /dev/sx8/$N and /dev/sx8/$Np$M.
360 tristate "RAM block device support"
362 Saying Y here will allow you to use a portion of your RAM memory as
363 a block device, so that you can make file systems on it, read and
364 write to it and do all the other things that you can do with normal
365 block devices (such as hard drives). It is usually used to load and
366 store a copy of a minimal root file system off of a floppy into RAM
367 during the initial install of Linux.
369 Note that the kernel command line option "ramdisk=XX" is now obsolete.
370 For details, read <file:Documentation/blockdev/ramdisk.txt>.
372 To compile this driver as a module, choose M here: the
373 module will be called brd. An alias "rd" has been defined
374 for historical reasons.
376 Most normal users won't need the RAM disk functionality, and can
379 config BLK_DEV_RAM_COUNT
380 int "Default number of RAM disks"
382 depends on BLK_DEV_RAM
384 The default value is 16 RAM disks. Change this if you know what you
385 are doing. If you boot from a filesystem that needs to be extracted
386 in memory, you will need at least one RAM disk (e.g. root on cramfs).
388 config BLK_DEV_RAM_SIZE
389 int "Default RAM disk size (kbytes)"
390 depends on BLK_DEV_RAM
393 The default value is 4096 kilobytes. Only change this if you know
396 config BLK_DEV_RAM_DAX
397 bool "Support Direct Access (DAX) to RAM block devices"
398 depends on BLK_DEV_RAM && FS_DAX
401 Support filesystems using DAX to access RAM block devices. This
402 avoids double-buffering data in the page cache before copying it
403 to the block device. Answering Y will slightly enlarge the kernel,
404 and will prevent RAM block device backing store memory from being
405 allocated from highmem (only a problem for highmem systems).
408 tristate "Packet writing on CD/DVD media"
411 If you have a CDROM/DVD drive that supports packet writing, say
412 Y to include support. It should work with any MMC/Mt Fuji
413 compliant ATAPI or SCSI drive, which is just about any newer
416 Currently only writing to CD-RW, DVD-RW, DVD+RW and DVDRAM discs
418 DVD-RW disks must be in restricted overwrite mode.
420 See the file <file:Documentation/cdrom/packet-writing.txt>
421 for further information on the use of this driver.
423 To compile this driver as a module, choose M here: the
424 module will be called pktcdvd.
426 config CDROM_PKTCDVD_BUFFERS
427 int "Free buffers for data gathering"
428 depends on CDROM_PKTCDVD
431 This controls the maximum number of active concurrent packets. More
432 concurrent packets can increase write performance, but also require
433 more memory. Each concurrent packet will require approximately 64Kb
434 of non-swappable kernel memory, memory which will be allocated when
435 a disc is opened for writing.
437 config CDROM_PKTCDVD_WCACHE
438 bool "Enable write caching"
439 depends on CDROM_PKTCDVD
441 If enabled, write caching will be set for the CD-R/W device. For now
442 this option is dangerous unless the CD-RW media is known good, as we
443 don't do deferred write error handling yet.
446 tristate "ATA over Ethernet support"
449 This driver provides Support for ATA over Ethernet block
450 devices like the Coraid EtherDrive (R) Storage Blade.
453 tristate "mGine mflash, gflash support"
454 depends on ARM && GPIOLIB
456 mGine mFlash(gFlash) block device driver
459 int "Size of reserved area before MBR"
463 Define size of reserved area that usually used for boot. Unit is KB.
464 All of the block device operation will be taken this value as start
470 tristate "Sun Virtual Disk Client support"
473 Support for virtual disk devices as a client under Sun
476 source "drivers/s390/block/Kconfig"
479 tristate "Xilinx SystemACE support"
480 depends on 4xx || MICROBLAZE
482 Include support for the Xilinx SystemACE CompactFlash interface
484 config XEN_BLKDEV_FRONTEND
485 tristate "Xen virtual block device support"
488 select XEN_XENBUS_FRONTEND
490 This driver implements the front-end of the Xen virtual
491 block device driver. It communicates with a back-end driver
492 in another domain which drives the actual block device.
494 config XEN_BLKDEV_BACKEND
495 tristate "Xen block-device backend driver"
496 depends on XEN_BACKEND
498 The block-device backend driver allows the kernel to export its
499 block devices to other guests via a high-performance shared-memory
502 The corresponding Linux frontend driver is enabled by the
503 CONFIG_XEN_BLKDEV_FRONTEND configuration option.
505 The backend driver attaches itself to a any block device specified
506 in the XenBus configuration. There are no limits to what the block
507 device as long as it has a major and minor.
509 If you are compiling a kernel to run in a Xen block backend driver
510 domain (often this is domain 0) you should say Y here. To
511 compile this driver as a module, chose M here: the module
512 will be called xen-blkback.
516 tristate "Virtio block driver"
519 This is the virtual block driver for virtio. It can be used with
520 lguest or QEMU based VMMs (like KVM or Xen). Say Y or M.
523 bool "Very old hard disk (MFM/RLL/IDE) driver"
525 depends on !ARM || ARCH_RPC || BROKEN
527 This is a very old hard disk driver that lacks the enhanced
528 functionality of the newer ones.
530 It is required for systems with ancient MFM/RLL/ESDI drives.
535 tristate "Rados block device (RBD)"
536 depends on INET && BLOCK
543 Say Y here if you want include the Rados block device, which stripes
544 a block device over objects stored in the Ceph distributed object
547 More information at http://ceph.newdream.net/.
552 tristate "IBM Flash Adapter 900GB Full Height PCIe Device Driver"
555 Device driver for IBM's high speed PCIe SSD
556 storage device: Flash Adapter 900GB Full Height.
558 To compile this driver as a module, choose M here: the
559 module will be called rsxx.