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"
32 tristate "Support for PowerMac floppy"
33 depends on PPC_PMAC && !PPC_PMAC64
35 If you have a SWIM-3 (Super Woz Integrated Machine 3; from Apple)
36 floppy controller, say Y here. Most commonly found in PowerMacs.
39 tristate "PS/2 ESDI hard disk support"
40 depends on MCA && MCA_LEGACY && BROKEN
42 Say Y here if you have a PS/2 machine with a MCA bus and an ESDI
45 To compile this driver as a module, choose M here: the
46 module will be called ps2esdi.
49 tristate "Amiga Zorro II ramdisk support"
52 This enables support for using Chip RAM and Zorro II RAM as a
53 ramdisk or as a swap partition. Say Y if you want to include this
56 To compile this driver as a module, choose M here: the
57 module will be called z2ram.
60 tristate "Atari SLM laser printer support"
63 If you have an Atari SLM laser printer, say Y to include support for
64 it in the kernel. Otherwise, say N. This driver is also available as
65 a module ( = code which can be inserted in and removed from the
66 running kernel whenever you want). The module will be called
67 acsi_slm. Be warned: the driver needs much ST-RAM and can cause
68 problems due to that fact!
71 tristate "XT hard disk support"
72 depends on ISA && ISA_DMA_API
74 Very old 8 bit hard disk controllers used in the IBM XT computer
75 will be supported if you say Y here.
77 To compile this driver as a module, choose M here: the
78 module will be called xd.
80 It's pretty unlikely that you have one of these: say N.
83 tristate "Parallel port IDE device support"
86 There are many external CD-ROM and disk devices that connect through
87 your computer's parallel port. Most of them are actually IDE devices
88 using a parallel port IDE adapter. This option enables the PARIDE
89 subsystem which contains drivers for many of these external drives.
90 Read <file:Documentation/paride.txt> for more information.
92 If you have said Y to the "Parallel-port support" configuration
93 option, you may share a single port between your printer and other
94 parallel port devices. Answer Y to build PARIDE support into your
95 kernel, or M if you would like to build it as a loadable module. If
96 your parallel port support is in a loadable module, you must build
97 PARIDE as a module. If you built PARIDE support into your kernel,
98 you may still build the individual protocol modules and high-level
99 drivers as loadable modules. If you build this support as a module,
100 it will be called paride.
102 To use the PARIDE support, you must say Y or M here and also to at
103 least one high-level driver (e.g. "Parallel port IDE disks",
104 "Parallel port ATAPI CD-ROMs", "Parallel port ATAPI disks" etc.) and
105 to at least one protocol driver (e.g. "ATEN EH-100 protocol",
106 "MicroSolutions backpack protocol", "DataStor Commuter protocol"
109 source "drivers/block/paride/Kconfig"
112 tristate "Compaq SMART2 support"
115 This is the driver for Compaq Smart Array controllers. Everyone
116 using these boards should say Y here. See the file
117 <file:Documentation/cpqarray.txt> for the current list of boards
118 supported by this driver, and for further information on the use of
121 config BLK_CPQ_CISS_DA
122 tristate "Compaq Smart Array 5xxx support"
125 This is the driver for Compaq Smart Array 5xxx controllers.
126 Everyone using these boards should say Y here.
127 See <file:Documentation/cciss.txt> for the current list of
128 boards supported by this driver, and for further information
129 on the use of this driver.
131 config CISS_SCSI_TAPE
132 bool "SCSI tape drive support for Smart Array 5xxx"
133 depends on BLK_CPQ_CISS_DA && PROC_FS
134 depends on SCSI=y || SCSI=BLK_CPQ_CISS_DA
136 When enabled (Y), this option allows SCSI tape drives and SCSI medium
137 changers (tape robots) to be accessed via a Compaq 5xxx array
138 controller. (See <file:Documentation/cciss.txt> for more details.)
140 "SCSI support" and "SCSI tape support" must also be enabled for this
143 When this option is disabled (N), the SCSI portion of the driver
146 config BLK_DEV_DAC960
147 tristate "Mylex DAC960/DAC1100 PCI RAID Controller support"
150 This driver adds support for the Mylex DAC960, AcceleRAID, and
151 eXtremeRAID PCI RAID controllers. See the file
152 <file:Documentation/README.DAC960> for further information about
155 To compile this driver as a module, choose M here: the
156 module will be called DAC960.
159 tristate "Micro Memory MM5415 Battery Backed RAM support (EXPERIMENTAL)"
160 depends on PCI && EXPERIMENTAL
162 Saying Y here will include support for the MM5415 family of
163 battery backed (Non-volatile) RAM cards.
164 <http://www.umem.com/>
166 The cards appear as block devices that can be partitioned into
167 as many as 15 partitions.
169 To compile this driver as a module, choose M here: the
170 module will be called umem.
172 The umem driver has not yet been allocated a MAJOR number, so
173 one is chosen dynamically.
176 bool "Virtual block device"
179 The User-Mode Linux port includes a driver called UBD which will let
180 you access arbitrary files on the host computer as block devices.
181 Unless you know that you do not need such virtual block devices say
184 config BLK_DEV_UBD_SYNC
185 bool "Always do synchronous disk IO for UBD"
186 depends on BLK_DEV_UBD
188 Writes to the virtual block device are not immediately written to the
189 host's disk; this may cause problems if, for example, the User-Mode
190 Linux 'Virtual Machine' uses a journalling filesystem and the host
193 Synchronous operation (i.e. always writing data to the host's disk
194 immediately) is configurable on a per-UBD basis by using a special
195 kernel command line option. Alternatively, you can say Y here to
196 turn on synchronous operation by default for all block devices.
198 If you're running a journalling file system (like reiserfs, for
199 example) in your virtual machine, you will want to say Y here. If
200 you care for the safety of the data in your virtual machine, Y is a
201 wise choice too. In all other cases (for example, if you're just
202 playing around with User-Mode Linux) you can choose N.
204 config BLK_DEV_COW_COMMON
209 tristate "Example IO memory driver (BROKEN)"
210 depends on UML && BROKEN
212 The User-Mode Linux port can provide support for IO Memory
213 emulation with this option. This allows a host file to be
214 specified as an I/O region on the kernel command line. That file
215 will be mapped into UML's kernel address space where a driver can
216 locate it and do whatever it wants with the memory, including
217 providing an interface to it for UML processes to use.
219 For more information, see
220 <http://user-mode-linux.sourceforge.net/iomem.html>.
222 If you'd like to be able to provide a simulated IO port space for
223 User-Mode Linux processes, say Y. If unsure, say N.
226 tristate "Loopback device support"
228 Saying Y here will allow you to use a regular file as a block
229 device; you can then create a file system on that block device and
230 mount it just as you would mount other block devices such as hard
231 drive partitions, CD-ROM drives or floppy drives. The loop devices
232 are block special device files with major number 7 and typically
233 called /dev/loop0, /dev/loop1 etc.
235 This is useful if you want to check an ISO 9660 file system before
236 burning the CD, or if you want to use floppy images without first
237 writing them to floppy. Furthermore, some Linux distributions avoid
238 the need for a dedicated Linux partition by keeping their complete
239 root file system inside a DOS FAT file using this loop device
242 To use the loop device, you need the losetup utility, found in the
243 util-linux package, see
244 <ftp://ftp.kernel.org/pub/linux/utils/util-linux/>.
246 The loop device driver can also be used to "hide" a file system in
247 a disk partition, floppy, or regular file, either using encryption
248 (scrambling the data) or steganography (hiding the data in the low
249 bits of, say, a sound file). This is also safe if the file resides
250 on a remote file server.
252 There are several ways of encrypting disks. Some of these require
253 kernel patches. The vanilla kernel offers the cryptoloop option
254 and a Device Mapper target (which is superior, as it supports all
255 file systems). If you want to use the cryptoloop, say Y to both
256 LOOP and CRYPTOLOOP, and make sure you have a recent (version 2.12
257 or later) version of util-linux. Additionally, be aware that
258 the cryptoloop is not safe for storing journaled filesystems.
260 Note that this loop device has nothing to do with the loopback
261 device used for network connections from the machine to itself.
263 To compile this driver as a module, choose M here: the
264 module will be called loop.
266 Most users will answer N here.
268 config BLK_DEV_CRYPTOLOOP
269 tristate "Cryptoloop Support"
272 depends on BLK_DEV_LOOP
274 Say Y here if you want to be able to use the ciphers that are
275 provided by the CryptoAPI as loop transformation. This might be
276 used as hard disk encryption.
278 WARNING: This device is not safe for journaled file systems like
279 ext3 or Reiserfs. Please use the Device Mapper crypto module
280 instead, which can be configured to be on-disk compatible with the
284 tristate "Network block device support"
287 Saying Y here will allow your computer to be a client for network
288 block devices, i.e. it will be able to use block devices exported by
289 servers (mount file systems on them etc.). Communication between
290 client and server works over TCP/IP networking, but to the client
291 program this is hidden: it looks like a regular local file access to
292 a block device special file such as /dev/nd0.
294 Network block devices also allows you to run a block-device in
295 userland (making server and client physically the same computer,
296 communicating using the loopback network device).
298 Read <file:Documentation/nbd.txt> for more information, especially
299 about where to find the server code, which runs in user space and
300 does not need special kernel support.
302 Note that this has nothing to do with the network file systems NFS
303 or Coda; you can say N here even if you intend to use NFS or Coda.
305 To compile this driver as a module, choose M here: the
306 module will be called nbd.
311 tristate "Promise SATA SX8 support"
314 Saying Y or M here will enable support for the
315 Promise SATA SX8 controllers.
317 Use devices /dev/sx8/$N and /dev/sx8/$Np$M.
320 tristate "Low Performance USB Block driver"
323 This driver supports certain USB attached storage devices
326 If you enable this driver, it is recommended to avoid conflicts
327 with usb-storage by enabling USB_LIBUSUAL.
332 tristate "RAM disk support"
334 Saying Y here will allow you to use a portion of your RAM memory as
335 a block device, so that you can make file systems on it, read and
336 write to it and do all the other things that you can do with normal
337 block devices (such as hard drives). It is usually used to load and
338 store a copy of a minimal root file system off of a floppy into RAM
339 during the initial install of Linux.
341 Note that the kernel command line option "ramdisk=XX" is now
342 obsolete. For details, read <file:Documentation/ramdisk.txt>.
344 To compile this driver as a module, choose M here: the
345 module will be called rd.
347 Most normal users won't need the RAM disk functionality, and can
350 config BLK_DEV_RAM_COUNT
351 int "Default number of RAM disks"
353 depends on BLK_DEV_RAM
355 The default value is 16 RAM disks. Change this if you know what
356 are doing. If you boot from a filesystem that needs to be extracted
357 in memory, you will need at least one RAM disk (e.g. root on cramfs).
359 config BLK_DEV_RAM_SIZE
360 int "Default RAM disk size (kbytes)"
361 depends on BLK_DEV_RAM
364 The default value is 4096 kilobytes. Only change this if you know
365 what are you doing. If you are using IBM S/390, then set this to
368 config BLK_DEV_RAM_BLOCKSIZE
369 int "Default RAM disk block size (bytes)"
370 depends on BLK_DEV_RAM
373 The default value is 1024 bytes. PAGE_SIZE is a much more
374 efficient choice however. The default is kept to ensure initrd
375 setups function - apparently needed by the rd_load_image routine
376 that supposes the filesystem in the image uses a 1024 blocksize.
379 tristate "Packet writing on CD/DVD media"
382 If you have a CDROM/DVD drive that supports packet writing, say
383 Y to include support. It should work with any MMC/Mt Fuji
384 compliant ATAPI or SCSI drive, which is just about any newer
387 Currently only writing to CD-RW, DVD-RW, DVD+RW and DVDRAM discs
389 DVD-RW disks must be in restricted overwrite mode.
391 See the file <file:Documentation/cdrom/packet-writing.txt>
392 for further information on the use of this driver.
394 To compile this driver as a module, choose M here: the
395 module will be called pktcdvd.
397 config CDROM_PKTCDVD_BUFFERS
398 int "Free buffers for data gathering"
399 depends on CDROM_PKTCDVD
402 This controls the maximum number of active concurrent packets. More
403 concurrent packets can increase write performance, but also require
404 more memory. Each concurrent packet will require approximately 64Kb
405 of non-swappable kernel memory, memory which will be allocated when
406 a disc is opened for writing.
408 config CDROM_PKTCDVD_WCACHE
409 bool "Enable write caching (EXPERIMENTAL)"
410 depends on CDROM_PKTCDVD && EXPERIMENTAL
412 If enabled, write caching will be set for the CD-R/W device. For now
413 this option is dangerous unless the CD-RW media is known good, as we
414 don't do deferred write error handling yet.
417 tristate "ATA over Ethernet support"
420 This driver provides Support for ATA over Ethernet block
421 devices like the Coraid EtherDrive (R) Storage Blade.
423 source "drivers/s390/block/Kconfig"