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 "Parallel port IDE device support"
83 There are many external CD-ROM and disk devices that connect through
84 your computer's parallel port. Most of them are actually IDE devices
85 using a parallel port IDE adapter. This option enables the PARIDE
86 subsystem which contains drivers for many of these external drives.
87 Read <file:Documentation/blockdev/paride.txt> for more information.
89 If you have said Y to the "Parallel-port support" configuration
90 option, you may share a single port between your printer and other
91 parallel port devices. Answer Y to build PARIDE support into your
92 kernel, or M if you would like to build it as a loadable module. If
93 your parallel port support is in a loadable module, you must build
94 PARIDE as a module. If you built PARIDE support into your kernel,
95 you may still build the individual protocol modules and high-level
96 drivers as loadable modules. If you build this support as a module,
97 it will be called paride.
99 To use the PARIDE support, you must say Y or M here and also to at
100 least one high-level driver (e.g. "Parallel port IDE disks",
101 "Parallel port ATAPI CD-ROMs", "Parallel port ATAPI disks" etc.) and
102 to at least one protocol driver (e.g. "ATEN EH-100 protocol",
103 "MicroSolutions backpack protocol", "DataStor Commuter protocol"
107 tristate "SEGA Dreamcast GD-ROM drive"
108 depends on SH_DREAMCAST
110 A standard SEGA Dreamcast comes with a modified CD ROM drive called a
111 "GD-ROM" by SEGA to signify it is capable of reading special disks
112 with up to 1 GB of data. This drive will also read standard CD ROM
113 disks. Select this option to access any disks in your GD ROM drive.
114 Most users will want to say "Y" here.
115 You can also build this as a module which will be called gdrom.
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_CRYPTOLOOP
260 tristate "Cryptoloop Support"
263 depends on BLK_DEV_LOOP
265 Say Y here if you want to be able to use the ciphers that are
266 provided by the CryptoAPI as loop transformation. This might be
267 used as hard disk encryption.
269 WARNING: This device is not safe for journaled file systems like
270 ext3 or Reiserfs. Please use the Device Mapper crypto module
271 instead, which can be configured to be on-disk compatible with the
274 source "drivers/block/drbd/Kconfig"
277 tristate "Network block device support"
280 Saying Y here will allow your computer to be a client for network
281 block devices, i.e. it will be able to use block devices exported by
282 servers (mount file systems on them etc.). Communication between
283 client and server works over TCP/IP networking, but to the client
284 program this is hidden: it looks like a regular local file access to
285 a block device special file such as /dev/nd0.
287 Network block devices also allows you to run a block-device in
288 userland (making server and client physically the same computer,
289 communicating using the loopback network device).
291 Read <file:Documentation/blockdev/nbd.txt> for more information,
292 especially about where to find the server code, which runs in user
293 space and does not need special kernel support.
295 Note that this has nothing to do with the network file systems NFS
296 or Coda; you can say N here even if you intend to use NFS or Coda.
298 To compile this driver as a module, choose M here: the
299 module will be called nbd.
304 tristate "OSD object-as-blkdev support"
305 depends on SCSI_OSD_ULD
307 Saying Y or M here will allow the exporting of a single SCSI
308 OSD (object-based storage) object as a Linux block device.
310 For example, if you create a 2G object on an OSD device,
311 you can then use this module to present that 2G object as
312 a Linux block device.
314 To compile this driver as a module, choose M here: the
315 module will be called osdblk.
320 tristate "Promise SATA SX8 support"
323 Saying Y or M here will enable support for the
324 Promise SATA SX8 controllers.
326 Use devices /dev/sx8/$N and /dev/sx8/$Np$M.
329 tristate "Low Performance USB Block driver"
332 This driver supports certain USB attached storage devices
335 If you enable this driver, it is recommended to avoid conflicts
336 with usb-storage by enabling USB_LIBUSUAL.
341 tristate "RAM block device support"
343 Saying Y here will allow you to use a portion of your RAM memory as
344 a block device, so that you can make file systems on it, read and
345 write to it and do all the other things that you can do with normal
346 block devices (such as hard drives). It is usually used to load and
347 store a copy of a minimal root file system off of a floppy into RAM
348 during the initial install of Linux.
350 Note that the kernel command line option "ramdisk=XX" is now obsolete.
351 For details, read <file:Documentation/blockdev/ramdisk.txt>.
353 To compile this driver as a module, choose M here: the
354 module will be called rd.
356 Most normal users won't need the RAM disk functionality, and can
359 config BLK_DEV_RAM_COUNT
360 int "Default number of RAM disks"
362 depends on BLK_DEV_RAM
364 The default value is 16 RAM disks. Change this if you know what you
365 are doing. If you boot from a filesystem that needs to be extracted
366 in memory, you will need at least one RAM disk (e.g. root on cramfs).
368 config BLK_DEV_RAM_SIZE
369 int "Default RAM disk size (kbytes)"
370 depends on BLK_DEV_RAM
373 The default value is 4096 kilobytes. Only change this if you know
377 bool "Support XIP filesystems on RAM block device"
378 depends on BLK_DEV_RAM
381 Support XIP filesystems (such as ext2 with XIP support on) on
382 top of block ram device. This will slightly enlarge the kernel, and
383 will prevent RAM block device backing store memory from being
384 allocated from highmem (only a problem for highmem systems).
387 tristate "Packet writing on CD/DVD media"
390 If you have a CDROM/DVD drive that supports packet writing, say
391 Y to include support. It should work with any MMC/Mt Fuji
392 compliant ATAPI or SCSI drive, which is just about any newer
395 Currently only writing to CD-RW, DVD-RW, DVD+RW and DVDRAM discs
397 DVD-RW disks must be in restricted overwrite mode.
399 See the file <file:Documentation/cdrom/packet-writing.txt>
400 for further information on the use of this driver.
402 To compile this driver as a module, choose M here: the
403 module will be called pktcdvd.
405 config CDROM_PKTCDVD_BUFFERS
406 int "Free buffers for data gathering"
407 depends on CDROM_PKTCDVD
410 This controls the maximum number of active concurrent packets. More
411 concurrent packets can increase write performance, but also require
412 more memory. Each concurrent packet will require approximately 64Kb
413 of non-swappable kernel memory, memory which will be allocated when
414 a disc is opened for writing.
416 config CDROM_PKTCDVD_WCACHE
417 bool "Enable write caching (EXPERIMENTAL)"
418 depends on CDROM_PKTCDVD && EXPERIMENTAL
420 If enabled, write caching will be set for the CD-R/W device. For now
421 this option is dangerous unless the CD-RW media is known good, as we
422 don't do deferred write error handling yet.
425 tristate "ATA over Ethernet support"
428 This driver provides Support for ATA over Ethernet block
429 devices like the Coraid EtherDrive (R) Storage Blade.
432 tristate "mGine mflash, gflash support"
433 depends on ARM && GPIOLIB
435 mGine mFlash(gFlash) block device driver
438 int "Size of reserved area before MBR"
442 Define size of reserved area that usually used for boot. Unit is KB.
443 All of the block device operation will be taken this value as start
449 tristate "Sun Virtual Disk Client support"
452 Support for virtual disk devices as a client under Sun
455 source "drivers/s390/block/Kconfig"
458 tristate "Xilinx SystemACE support"
459 depends on 4xx || MICROBLAZE
461 Include support for the Xilinx SystemACE CompactFlash interface
463 config XEN_BLKDEV_FRONTEND
464 tristate "Xen virtual block device support"
468 This driver implements the front-end of the Xen virtual
469 block device driver. It communicates with a back-end driver
470 in another domain which drives the actual block device.
473 tristate "Virtio block driver (EXPERIMENTAL)"
474 depends on EXPERIMENTAL && VIRTIO
476 This is the virtual block driver for virtio. It can be used with
477 lguest or QEMU based VMMs (like KVM or Xen). Say Y or M.
480 bool "Very old hard disk (MFM/RLL/IDE) driver"
482 depends on !ARM || ARCH_RPC || ARCH_SHARK || BROKEN
484 This is a very old hard disk driver that lacks the enhanced
485 functionality of the newer ones.
487 It is required for systems with ancient MFM/RLL/ESDI drives.