2 # Block device driver configuration
10 tristate "Normal floppy disk support"
11 depends on ARCH_MAY_HAVE_PC_FDC
13 If you want to use the floppy disk drive(s) of your PC under Linux,
14 say Y. Information about this driver, especially important for IBM
15 Thinkpad users, is contained in <file:Documentation/floppy.txt>.
16 That file also contains the location of the Floppy driver FAQ as
17 well as location of the fdutils package used to configure additional
18 parameters of the driver at run time.
20 To compile this driver as a module, choose M here: the
21 module will be called floppy.
24 tristate "Amiga floppy support"
28 tristate "Atari floppy support"
31 config BLK_DEV_SWIM_IOP
32 bool "Macintosh IIfx/Quadra 900/Quadra 950 floppy support (EXPERIMENTAL)"
33 depends on MAC && EXPERIMENTAL && BROKEN
35 Say Y here to support the SWIM (Super Woz Integrated Machine) IOP
36 floppy controller on the Macintosh IIfx and Quadra 900/950.
39 tristate "Support for PowerMac floppy"
40 depends on PPC_PMAC && !PPC_PMAC64
42 If you have a SWIM-3 (Super Woz Integrated Machine 3; from Apple)
43 floppy controller, say Y here. Most commonly found in PowerMacs.
46 tristate "PS/2 ESDI hard disk support"
47 depends on MCA && MCA_LEGACY && BROKEN
49 Say Y here if you have a PS/2 machine with a MCA bus and an ESDI
52 To compile this driver as a module, choose M here: the
53 module will be called ps2esdi.
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 "Atari ACSI support"
68 depends on ATARI && BROKEN
70 This enables support for the Atari ACSI interface. The driver
71 supports hard disks and CD-ROMs, which have 512-byte sectors, or can
72 be switched to that mode. Due to the ACSI command format, only disks
73 up to 1 GB are supported. Special support for certain ACSI to SCSI
74 adapters, which could relax that, isn't included yet. The ACSI
75 driver is also the basis for certain other drivers for devices
76 attached to the ACSI bus: Atari SLM laser printer, BioNet-100
77 Ethernet, and PAMsNet Ethernet. If you want to use one of these
78 devices, you need ACSI support, too.
80 To compile this driver as a module, choose M here: the
81 module will be called acsi.
83 comment "Some devices (e.g. CD jukebox) support multiple LUNs"
84 depends on ATARI && ATARI_ACSI
87 bool "Probe all LUNs on each ACSI device"
90 If you have a ACSI device that supports more than one LUN (Logical
91 Unit Number), e.g. a CD jukebox, you should say Y here so that all
92 will be found by the ACSI driver. An ACSI device with multiple LUNs
93 acts logically like multiple ACSI devices. The vast majority of ACSI
94 devices have only one LUN, and so most people can say N here and
95 should in fact do so, because it is safer.
98 tristate "Atari SLM laser printer support"
99 depends on ATARI && ATARI_ACSI!=n
101 If you have an Atari SLM laser printer, say Y to include support for
102 it in the kernel. Otherwise, say N. This driver is also available as
103 a module ( = code which can be inserted in and removed from the
104 running kernel whenever you want). The module will be called
105 acsi_slm. Be warned: the driver needs much ST-RAM and can cause
106 problems due to that fact!
109 tristate "XT hard disk support"
110 depends on ISA && ISA_DMA_API
112 Very old 8 bit hard disk controllers used in the IBM XT computer
113 will be supported if you say Y here.
115 To compile this driver as a module, choose M here: the
116 module will be called xd.
118 It's pretty unlikely that you have one of these: say N.
121 tristate "Parallel port IDE device support"
122 depends on PARPORT_PC
124 There are many external CD-ROM and disk devices that connect through
125 your computer's parallel port. Most of them are actually IDE devices
126 using a parallel port IDE adapter. This option enables the PARIDE
127 subsystem which contains drivers for many of these external drives.
128 Read <file:Documentation/paride.txt> for more information.
130 If you have said Y to the "Parallel-port support" configuration
131 option, you may share a single port between your printer and other
132 parallel port devices. Answer Y to build PARIDE support into your
133 kernel, or M if you would like to build it as a loadable module. If
134 your parallel port support is in a loadable module, you must build
135 PARIDE as a module. If you built PARIDE support into your kernel,
136 you may still build the individual protocol modules and high-level
137 drivers as loadable modules. If you build this support as a module,
138 it will be called paride.
140 To use the PARIDE support, you must say Y or M here and also to at
141 least one high-level driver (e.g. "Parallel port IDE disks",
142 "Parallel port ATAPI CD-ROMs", "Parallel port ATAPI disks" etc.) and
143 to at least one protocol driver (e.g. "ATEN EH-100 protocol",
144 "MicroSolutions backpack protocol", "DataStor Commuter protocol"
147 source "drivers/block/paride/Kconfig"
150 tristate "Compaq SMART2 support"
153 This is the driver for Compaq Smart Array controllers. Everyone
154 using these boards should say Y here. See the file
155 <file:Documentation/cpqarray.txt> for the current list of boards
156 supported by this driver, and for further information on the use of
159 config BLK_CPQ_CISS_DA
160 tristate "Compaq Smart Array 5xxx support"
163 This is the driver for Compaq Smart Array 5xxx controllers.
164 Everyone using these boards should say Y here.
165 See <file:Documentation/cciss.txt> for the current list of
166 boards supported by this driver, and for further information
167 on the use of this driver.
169 config CISS_SCSI_TAPE
170 bool "SCSI tape drive support for Smart Array 5xxx"
171 depends on BLK_CPQ_CISS_DA && SCSI && PROC_FS
173 When enabled (Y), this option allows SCSI tape drives and SCSI medium
174 changers (tape robots) to be accessed via a Compaq 5xxx array
175 controller. (See <file:Documentation/cciss.txt> for more details.)
177 "SCSI support" and "SCSI tape support" must also be enabled for this
180 When this option is disabled (N), the SCSI portion of the driver
183 config BLK_DEV_DAC960
184 tristate "Mylex DAC960/DAC1100 PCI RAID Controller support"
187 This driver adds support for the Mylex DAC960, AcceleRAID, and
188 eXtremeRAID PCI RAID controllers. See the file
189 <file:Documentation/README.DAC960> for further information about
192 To compile this driver as a module, choose M here: the
193 module will be called DAC960.
196 tristate "Micro Memory MM5415 Battery Backed RAM support (EXPERIMENTAL)"
197 depends on PCI && EXPERIMENTAL
199 Saying Y here will include support for the MM5415 family of
200 battery backed (Non-volatile) RAM cards.
201 <http://www.umem.com/>
203 The cards appear as block devices that can be partitioned into
204 as many as 15 partitions.
206 To compile this driver as a module, choose M here: the
207 module will be called umem.
209 The umem driver has not yet been allocated a MAJOR number, so
210 one is chosen dynamically.
213 bool "Virtual block device"
216 The User-Mode Linux port includes a driver called UBD which will let
217 you access arbitrary files on the host computer as block devices.
218 Unless you know that you do not need such virtual block devices say
221 config BLK_DEV_UBD_SYNC
222 bool "Always do synchronous disk IO for UBD"
223 depends on BLK_DEV_UBD
225 Writes to the virtual block device are not immediately written to the
226 host's disk; this may cause problems if, for example, the User-Mode
227 Linux 'Virtual Machine' uses a journalling filesystem and the host
230 Synchronous operation (i.e. always writing data to the host's disk
231 immediately) is configurable on a per-UBD basis by using a special
232 kernel command line option. Alternatively, you can say Y here to
233 turn on synchronous operation by default for all block devices.
235 If you're running a journalling file system (like reiserfs, for
236 example) in your virtual machine, you will want to say Y here. If
237 you care for the safety of the data in your virtual machine, Y is a
238 wise choice too. In all other cases (for example, if you're just
239 playing around with User-Mode Linux) you can choose N.
241 config BLK_DEV_COW_COMMON
246 tristate "Example IO memory driver (BROKEN)"
247 depends on UML && BROKEN
249 The User-Mode Linux port can provide support for IO Memory
250 emulation with this option. This allows a host file to be
251 specified as an I/O region on the kernel command line. That file
252 will be mapped into UML's kernel address space where a driver can
253 locate it and do whatever it wants with the memory, including
254 providing an interface to it for UML processes to use.
256 For more information, see
257 <http://user-mode-linux.sourceforge.net/iomem.html>.
259 If you'd like to be able to provide a simulated IO port space for
260 User-Mode Linux processes, say Y. If unsure, say N.
263 tristate "Loopback device support"
265 Saying Y here will allow you to use a regular file as a block
266 device; you can then create a file system on that block device and
267 mount it just as you would mount other block devices such as hard
268 drive partitions, CD-ROM drives or floppy drives. The loop devices
269 are block special device files with major number 7 and typically
270 called /dev/loop0, /dev/loop1 etc.
272 This is useful if you want to check an ISO 9660 file system before
273 burning the CD, or if you want to use floppy images without first
274 writing them to floppy. Furthermore, some Linux distributions avoid
275 the need for a dedicated Linux partition by keeping their complete
276 root file system inside a DOS FAT file using this loop device
279 To use the loop device, you need the losetup utility, found in the
280 util-linux package, see
281 <ftp://ftp.kernel.org/pub/linux/utils/util-linux/>.
283 The loop device driver can also be used to "hide" a file system in
284 a disk partition, floppy, or regular file, either using encryption
285 (scrambling the data) or steganography (hiding the data in the low
286 bits of, say, a sound file). This is also safe if the file resides
287 on a remote file server.
289 There are several ways of encrypting disks. Some of these require
290 kernel patches. The vanilla kernel offers the cryptoloop option
291 and a Device Mapper target (which is superior, as it supports all
292 file systems). If you want to use the cryptoloop, say Y to both
293 LOOP and CRYPTOLOOP, and make sure you have a recent (version 2.12
294 or later) version of util-linux. Additionally, be aware that
295 the cryptoloop is not safe for storing journaled filesystems.
297 Note that this loop device has nothing to do with the loopback
298 device used for network connections from the machine to itself.
300 To compile this driver as a module, choose M here: the
301 module will be called loop.
303 Most users will answer N here.
305 config BLK_DEV_CRYPTOLOOP
306 tristate "Cryptoloop Support"
308 depends on BLK_DEV_LOOP
310 Say Y here if you want to be able to use the ciphers that are
311 provided by the CryptoAPI as loop transformation. This might be
312 used as hard disk encryption.
314 WARNING: This device is not safe for journaled file systems like
315 ext3 or Reiserfs. Please use the Device Mapper crypto module
316 instead, which can be configured to be on-disk compatible with the
320 tristate "Network block device support"
323 Saying Y here will allow your computer to be a client for network
324 block devices, i.e. it will be able to use block devices exported by
325 servers (mount file systems on them etc.). Communication between
326 client and server works over TCP/IP networking, but to the client
327 program this is hidden: it looks like a regular local file access to
328 a block device special file such as /dev/nd0.
330 Network block devices also allows you to run a block-device in
331 userland (making server and client physically the same computer,
332 communicating using the loopback network device).
334 Read <file:Documentation/nbd.txt> for more information, especially
335 about where to find the server code, which runs in user space and
336 does not need special kernel support.
338 Note that this has nothing to do with the network file systems NFS
339 or Coda; you can say N here even if you intend to use NFS or Coda.
341 To compile this driver as a module, choose M here: the
342 module will be called nbd.
347 tristate "Promise SATA SX8 support"
350 Saying Y or M here will enable support for the
351 Promise SATA SX8 controllers.
353 Use devices /dev/sx8/$N and /dev/sx8/$Np$M.
356 tristate "Low Performance USB Block driver"
359 This driver supports certain USB attached storage devices
362 If you enable this driver, it is recommended to avoid conflicts
363 with usb-storage by enabling USB_LIBUSUAL.
368 tristate "RAM disk support"
370 Saying Y here will allow you to use a portion of your RAM memory as
371 a block device, so that you can make file systems on it, read and
372 write to it and do all the other things that you can do with normal
373 block devices (such as hard drives). It is usually used to load and
374 store a copy of a minimal root file system off of a floppy into RAM
375 during the initial install of Linux.
377 Note that the kernel command line option "ramdisk=XX" is now
378 obsolete. For details, read <file:Documentation/ramdisk.txt>.
380 To compile this driver as a module, choose M here: the
381 module will be called rd.
383 Most normal users won't need the RAM disk functionality, and can
386 config BLK_DEV_RAM_COUNT
387 int "Default number of RAM disks"
389 depends on BLK_DEV_RAM
391 The default value is 16 RAM disks. Change this if you know what
392 are doing. If you boot from a filesystem that needs to be extracted
393 in memory, you will need at least one RAM disk (e.g. root on cramfs).
395 config BLK_DEV_RAM_SIZE
396 int "Default RAM disk size (kbytes)"
397 depends on BLK_DEV_RAM
400 The default value is 4096 kilobytes. Only change this if you know
401 what are you doing. If you are using IBM S/390, then set this to
404 config BLK_DEV_RAM_BLOCKSIZE
405 int "Default RAM disk block size (bytes)"
406 depends on BLK_DEV_RAM
409 The default value is 1024 bytes. PAGE_SIZE is a much more
410 efficient choice however. The default is kept to ensure initrd
411 setups function - apparently needed by the rd_load_image routine
412 that supposes the filesystem in the image uses a 1024 blocksize.
414 config BLK_DEV_INITRD
415 bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support"
416 depends on BROKEN || !FRV
418 The initial RAM filesystem is a ramfs which is loaded by the
419 boot loader (loadlin or lilo) and that is mounted as root
420 before the normal boot procedure. It is typically used to
421 load modules needed to mount the "real" root file system,
422 etc. See <file:Documentation/initrd.txt> for details.
424 If RAM disk support (BLK_DEV_RAM) is also included, this
425 also enables initial RAM disk (initrd) support.
429 tristate "Packet writing on CD/DVD media"
432 If you have a CDROM drive that supports packet writing, say Y to
433 include preliminary support. It should work with any MMC/Mt Fuji
434 compliant ATAPI or SCSI drive, which is just about any newer CD
437 Currently only writing to CD-RW, DVD-RW and DVD+RW discs is possible.
438 DVD-RW disks must be in restricted overwrite mode.
440 To compile this driver as a module, choose M here: the
441 module will be called pktcdvd.
443 config CDROM_PKTCDVD_BUFFERS
444 int "Free buffers for data gathering"
445 depends on CDROM_PKTCDVD
448 This controls the maximum number of active concurrent packets. More
449 concurrent packets can increase write performance, but also require
450 more memory. Each concurrent packet will require approximately 64Kb
451 of non-swappable kernel memory, memory which will be allocated when
452 a disc is opened for writing.
454 config CDROM_PKTCDVD_WCACHE
455 bool "Enable write caching (EXPERIMENTAL)"
456 depends on CDROM_PKTCDVD && EXPERIMENTAL
458 If enabled, write caching will be set for the CD-R/W device. For now
459 this option is dangerous unless the CD-RW media is known good, as we
460 don't do deferred write error handling yet.
462 source "drivers/s390/block/Kconfig"
465 tristate "ATA over Ethernet support"
468 This driver provides Support for ATA over Ethernet block
469 devices like the Coraid EtherDrive (R) Storage Blade.