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 <file:Documentation/floppy.txt>.
25 That file also contains the location of the Floppy driver FAQ as
26 well as location of the fdutils package used to configure additional
27 parameters of the driver at run time.
29 To compile this driver as a module, choose M here: the
30 module will be called floppy.
33 tristate "Amiga floppy support"
37 tristate "Atari floppy support"
41 tristate "Support for PowerMac floppy"
42 depends on PPC_PMAC && !PPC_PMAC64
44 If you have a SWIM-3 (Super Woz Integrated Machine 3; from Apple)
45 floppy controller, say Y here. Most commonly found in PowerMacs.
47 <<<<<<< HEAD:drivers/block/Kconfig
49 tristate "PS/2 ESDI hard disk support"
50 depends on MCA && MCA_LEGACY && BROKEN
52 Say Y here if you have a PS/2 machine with a MCA bus and an ESDI
55 To compile this driver as a module, choose M here: the
56 module will be called ps2esdi.
59 >>>>>>> 264e3e889d86e552b4191d69bb60f4f3b383135a:drivers/block/Kconfig
61 tristate "Amiga Zorro II ramdisk support"
64 This enables support for using Chip RAM and Zorro II RAM as a
65 ramdisk or as a swap partition. Say Y if you want to include this
68 To compile this driver as a module, choose M here: the
69 module will be called z2ram.
72 tristate "XT hard disk support"
73 depends on ISA && ISA_DMA_API
74 select CHECK_SIGNATURE
76 Very old 8 bit hard disk controllers used in the IBM XT computer
77 will be supported if you say Y here.
79 To compile this driver as a module, choose M here: the
80 module will be called xd.
82 It's pretty unlikely that you have one of these: say N.
85 tristate "Parallel port IDE device support"
88 There are many external CD-ROM and disk devices that connect through
89 your computer's parallel port. Most of them are actually IDE devices
90 using a parallel port IDE adapter. This option enables the PARIDE
91 subsystem which contains drivers for many of these external drives.
92 Read <file:Documentation/paride.txt> for more information.
94 If you have said Y to the "Parallel-port support" configuration
95 option, you may share a single port between your printer and other
96 parallel port devices. Answer Y to build PARIDE support into your
97 kernel, or M if you would like to build it as a loadable module. If
98 your parallel port support is in a loadable module, you must build
99 PARIDE as a module. If you built PARIDE support into your kernel,
100 you may still build the individual protocol modules and high-level
101 drivers as loadable modules. If you build this support as a module,
102 it will be called paride.
104 To use the PARIDE support, you must say Y or M here and also to at
105 least one high-level driver (e.g. "Parallel port IDE disks",
106 "Parallel port ATAPI CD-ROMs", "Parallel port ATAPI disks" etc.) and
107 to at least one protocol driver (e.g. "ATEN EH-100 protocol",
108 "MicroSolutions backpack protocol", "DataStor Commuter protocol"
112 tristate "SEGA Dreamcast GD-ROM drive"
113 depends on SH_DREAMCAST
115 A standard SEGA Dreamcast comes with a modified CD ROM drive called a
116 "GD-ROM" by SEGA to signify it is capable of reading special disks
117 with up to 1 GB of data. This drive will also read standard CD ROM
118 disks. Select this option to access any disks in your GD ROM drive.
119 Most users will want to say "Y" here.
120 You can also build this as a module which will be called gdrom.ko
122 source "drivers/block/paride/Kconfig"
125 tristate "Compaq SMART2 support"
126 depends on PCI && VIRT_TO_BUS
128 This is the driver for Compaq Smart Array controllers. Everyone
129 using these boards should say Y here. See the file
130 <file:Documentation/cpqarray.txt> for the current list of boards
131 supported by this driver, and for further information on the use of
134 config BLK_CPQ_CISS_DA
135 tristate "Compaq Smart Array 5xxx support"
138 This is the driver for Compaq Smart Array 5xxx controllers.
139 Everyone using these boards should say Y here.
140 See <file:Documentation/cciss.txt> for the current list of
141 boards supported by this driver, and for further information
142 on the use of this driver.
144 config CISS_SCSI_TAPE
145 bool "SCSI tape drive support for Smart Array 5xxx"
146 depends on BLK_CPQ_CISS_DA && PROC_FS
147 depends on SCSI=y || SCSI=BLK_CPQ_CISS_DA
149 When enabled (Y), this option allows SCSI tape drives and SCSI medium
150 changers (tape robots) to be accessed via a Compaq 5xxx array
151 controller. (See <file:Documentation/cciss.txt> for more details.)
153 "SCSI support" and "SCSI tape support" must also be enabled for this
156 When this option is disabled (N), the SCSI portion of the driver
159 config BLK_DEV_DAC960
160 tristate "Mylex DAC960/DAC1100 PCI RAID Controller support"
163 This driver adds support for the Mylex DAC960, AcceleRAID, and
164 eXtremeRAID PCI RAID controllers. See the file
165 <file:Documentation/README.DAC960> for further information about
168 To compile this driver as a module, choose M here: the
169 module will be called DAC960.
172 tristate "Micro Memory MM5415 Battery Backed RAM support (EXPERIMENTAL)"
173 depends on PCI && EXPERIMENTAL
175 Saying Y here will include support for the MM5415 family of
176 battery backed (Non-volatile) RAM cards.
177 <http://www.umem.com/>
179 The cards appear as block devices that can be partitioned into
180 as many as 15 partitions.
182 To compile this driver as a module, choose M here: the
183 module will be called umem.
185 The umem driver has not yet been allocated a MAJOR number, so
186 one is chosen dynamically.
189 bool "Virtual block device"
192 The User-Mode Linux port includes a driver called UBD which will let
193 you access arbitrary files on the host computer as block devices.
194 Unless you know that you do not need such virtual block devices say
197 config BLK_DEV_UBD_SYNC
198 bool "Always do synchronous disk IO for UBD"
199 depends on BLK_DEV_UBD
201 Writes to the virtual block device are not immediately written to the
202 host's disk; this may cause problems if, for example, the User-Mode
203 Linux 'Virtual Machine' uses a journalling filesystem and the host
206 Synchronous operation (i.e. always writing data to the host's disk
207 immediately) is configurable on a per-UBD basis by using a special
208 kernel command line option. Alternatively, you can say Y here to
209 turn on synchronous operation by default for all block devices.
211 If you're running a journalling file system (like reiserfs, for
212 example) in your virtual machine, you will want to say Y here. If
213 you care for the safety of the data in your virtual machine, Y is a
214 wise choice too. In all other cases (for example, if you're just
215 playing around with User-Mode Linux) you can choose N.
217 config BLK_DEV_COW_COMMON
222 tristate "Loopback device support"
224 Saying Y here will allow you to use a regular file as a block
225 device; you can then create a file system on that block device and
226 mount it just as you would mount other block devices such as hard
227 drive partitions, CD-ROM drives or floppy drives. The loop devices
228 are block special device files with major number 7 and typically
229 called /dev/loop0, /dev/loop1 etc.
231 This is useful if you want to check an ISO 9660 file system before
232 burning the CD, or if you want to use floppy images without first
233 writing them to floppy. Furthermore, some Linux distributions avoid
234 the need for a dedicated Linux partition by keeping their complete
235 root file system inside a DOS FAT file using this loop device
238 To use the loop device, you need the losetup utility, found in the
239 util-linux package, see
240 <ftp://ftp.kernel.org/pub/linux/utils/util-linux/>.
242 The loop device driver can also be used to "hide" a file system in
243 a disk partition, floppy, or regular file, either using encryption
244 (scrambling the data) or steganography (hiding the data in the low
245 bits of, say, a sound file). This is also safe if the file resides
246 on a remote file server.
248 There are several ways of encrypting disks. Some of these require
249 kernel patches. The vanilla kernel offers the cryptoloop option
250 and a Device Mapper target (which is superior, as it supports all
251 file systems). If you want to use the cryptoloop, say Y to both
252 LOOP and CRYPTOLOOP, and make sure you have a recent (version 2.12
253 or later) version of util-linux. Additionally, be aware that
254 the cryptoloop is not safe for storing journaled filesystems.
256 Note that this loop device has nothing to do with the loopback
257 device used for network connections from the machine to itself.
259 To compile this driver as a module, choose M here: the
260 module will be called loop.
262 Most users will answer N here.
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
280 tristate "Network block device support"
283 Saying Y here will allow your computer to be a client for network
284 block devices, i.e. it will be able to use block devices exported by
285 servers (mount file systems on them etc.). Communication between
286 client and server works over TCP/IP networking, but to the client
287 program this is hidden: it looks like a regular local file access to
288 a block device special file such as /dev/nd0.
290 Network block devices also allows you to run a block-device in
291 userland (making server and client physically the same computer,
292 communicating using the loopback network device).
294 Read <file:Documentation/nbd.txt> for more information, especially
295 about where to find the server code, which runs in user space and
296 does not need special kernel support.
298 Note that this has nothing to do with the network file systems NFS
299 or Coda; you can say N here even if you intend to use NFS or Coda.
301 To compile this driver as a module, choose M here: the
302 module will be called nbd.
307 tristate "Promise SATA SX8 support"
310 Saying Y or M here will enable support for the
311 Promise SATA SX8 controllers.
313 Use devices /dev/sx8/$N and /dev/sx8/$Np$M.
316 tristate "Low Performance USB Block driver"
319 This driver supports certain USB attached storage devices
322 If you enable this driver, it is recommended to avoid conflicts
323 with usb-storage by enabling USB_LIBUSUAL.
328 tristate "RAM block device support"
330 Saying Y here will allow you to use a portion of your RAM memory as
331 a block device, so that you can make file systems on it, read and
332 write to it and do all the other things that you can do with normal
333 block devices (such as hard drives). It is usually used to load and
334 store a copy of a minimal root file system off of a floppy into RAM
335 during the initial install of Linux.
337 Note that the kernel command line option "ramdisk=XX" is now
338 obsolete. For details, read <file:Documentation/ramdisk.txt>.
340 To compile this driver as a module, choose M here: the
341 module will be called rd.
343 Most normal users won't need the RAM disk functionality, and can
346 config BLK_DEV_RAM_COUNT
347 int "Default number of RAM disks"
349 depends on BLK_DEV_RAM
351 The default value is 16 RAM disks. Change this if you know what you
352 are doing. If you boot from a filesystem that needs to be extracted
353 in memory, you will need at least one RAM disk (e.g. root on cramfs).
355 config BLK_DEV_RAM_SIZE
356 int "Default RAM disk size (kbytes)"
357 depends on BLK_DEV_RAM
360 The default value is 4096 kilobytes. Only change this if you know
364 bool "Support XIP filesystems on RAM block device"
365 depends on BLK_DEV_RAM
368 Support XIP filesystems (such as ext2 with XIP support on) on
369 top of block ram device. This will slightly enlarge the kernel, and
370 will prevent RAM block device backing store memory from being
371 allocated from highmem (only a problem for highmem systems).
374 tristate "Packet writing on CD/DVD media"
377 If you have a CDROM/DVD drive that supports packet writing, say
378 Y to include support. It should work with any MMC/Mt Fuji
379 compliant ATAPI or SCSI drive, which is just about any newer
382 Currently only writing to CD-RW, DVD-RW, DVD+RW and DVDRAM discs
384 DVD-RW disks must be in restricted overwrite mode.
386 See the file <file:Documentation/cdrom/packet-writing.txt>
387 for further information on the use of this driver.
389 To compile this driver as a module, choose M here: the
390 module will be called pktcdvd.
392 config CDROM_PKTCDVD_BUFFERS
393 int "Free buffers for data gathering"
394 depends on CDROM_PKTCDVD
397 This controls the maximum number of active concurrent packets. More
398 concurrent packets can increase write performance, but also require
399 more memory. Each concurrent packet will require approximately 64Kb
400 of non-swappable kernel memory, memory which will be allocated when
401 a disc is opened for writing.
403 config CDROM_PKTCDVD_WCACHE
404 bool "Enable write caching (EXPERIMENTAL)"
405 depends on CDROM_PKTCDVD && EXPERIMENTAL
407 If enabled, write caching will be set for the CD-R/W device. For now
408 this option is dangerous unless the CD-RW media is known good, as we
409 don't do deferred write error handling yet.
412 tristate "ATA over Ethernet support"
415 This driver provides Support for ATA over Ethernet block
416 devices like the Coraid EtherDrive (R) Storage Blade.
419 tristate "Sun Virtual Disk Client support"
422 Support for virtual disk devices as a client under Sun
425 source "drivers/s390/block/Kconfig"
428 tristate "Xilinx SystemACE support"
431 Include support for the Xilinx SystemACE CompactFlash interface
433 config XEN_BLKDEV_FRONTEND
434 tristate "Xen virtual block device support"
438 This driver implements the front-end of the Xen virtual
439 block device driver. It communicates with a back-end driver
440 in another domain which drives the actual block device.
443 tristate "Virtio block driver (EXPERIMENTAL)"
444 depends on EXPERIMENTAL && VIRTIO
446 This is the virtual block driver for virtio. It can be used with
447 lguest or QEMU based VMMs (like KVM or Xen). Say Y or M.