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.
48 tristate "PS/2 ESDI hard disk support"
49 depends on MCA && MCA_LEGACY && BROKEN
51 Say Y here if you have a PS/2 machine with a MCA bus and an ESDI
54 To compile this driver as a module, choose M here: the
55 module will be called ps2esdi.
58 tristate "Amiga Zorro II ramdisk support"
61 This enables support for using Chip RAM and Zorro II RAM as a
62 ramdisk or as a swap partition. Say Y if you want to include this
65 To compile this driver as a module, choose M here: the
66 module will be called z2ram.
69 tristate "XT hard disk support"
70 depends on ISA && ISA_DMA_API
72 Very old 8 bit hard disk controllers used in the IBM XT computer
73 will be supported if you say Y here.
75 To compile this driver as a module, choose M here: the
76 module will be called xd.
78 It's pretty unlikely that you have one of these: say N.
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/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"
110 tristate "Compaq SMART2 support"
111 depends on PCI && VIRT_TO_BUS
113 This is the driver for Compaq Smart Array controllers. Everyone
114 using these boards should say Y here. See the file
115 <file:Documentation/cpqarray.txt> for the current list of boards
116 supported by this driver, and for further information on the use of
119 config BLK_CPQ_CISS_DA
120 tristate "Compaq Smart Array 5xxx support"
123 This is the driver for Compaq Smart Array 5xxx controllers.
124 Everyone using these boards should say Y here.
125 See <file:Documentation/cciss.txt> for the current list of
126 boards supported by this driver, and for further information
127 on the use of this driver.
129 config CISS_SCSI_TAPE
130 bool "SCSI tape drive support for Smart Array 5xxx"
131 depends on BLK_CPQ_CISS_DA && PROC_FS
132 depends on SCSI=y || SCSI=BLK_CPQ_CISS_DA
134 When enabled (Y), this option allows SCSI tape drives and SCSI medium
135 changers (tape robots) to be accessed via a Compaq 5xxx array
136 controller. (See <file:Documentation/cciss.txt> for more details.)
138 "SCSI support" and "SCSI tape support" must also be enabled for this
141 When this option is disabled (N), the SCSI portion of the driver
144 config BLK_DEV_DAC960
145 tristate "Mylex DAC960/DAC1100 PCI RAID Controller support"
148 This driver adds support for the Mylex DAC960, AcceleRAID, and
149 eXtremeRAID PCI RAID controllers. See the file
150 <file:Documentation/README.DAC960> for further information about
153 To compile this driver as a module, choose M here: the
154 module will be called DAC960.
157 tristate "Micro Memory MM5415 Battery Backed RAM support (EXPERIMENTAL)"
158 depends on PCI && EXPERIMENTAL
160 Saying Y here will include support for the MM5415 family of
161 battery backed (Non-volatile) RAM cards.
162 <http://www.umem.com/>
164 The cards appear as block devices that can be partitioned into
165 as many as 15 partitions.
167 To compile this driver as a module, choose M here: the
168 module will be called umem.
170 The umem driver has not yet been allocated a MAJOR number, so
171 one is chosen dynamically.
174 bool "Virtual block device"
177 The User-Mode Linux port includes a driver called UBD which will let
178 you access arbitrary files on the host computer as block devices.
179 Unless you know that you do not need such virtual block devices say
182 config BLK_DEV_UBD_SYNC
183 bool "Always do synchronous disk IO for UBD"
184 depends on BLK_DEV_UBD
186 Writes to the virtual block device are not immediately written to the
187 host's disk; this may cause problems if, for example, the User-Mode
188 Linux 'Virtual Machine' uses a journalling filesystem and the host
191 Synchronous operation (i.e. always writing data to the host's disk
192 immediately) is configurable on a per-UBD basis by using a special
193 kernel command line option. Alternatively, you can say Y here to
194 turn on synchronous operation by default for all block devices.
196 If you're running a journalling file system (like reiserfs, for
197 example) in your virtual machine, you will want to say Y here. If
198 you care for the safety of the data in your virtual machine, Y is a
199 wise choice too. In all other cases (for example, if you're just
200 playing around with User-Mode Linux) you can choose N.
202 config BLK_DEV_COW_COMMON
207 tristate "Example IO memory driver (BROKEN)"
208 depends on UML && BROKEN
210 The User-Mode Linux port can provide support for IO Memory
211 emulation with this option. This allows a host file to be
212 specified as an I/O region on the kernel command line. That file
213 will be mapped into UML's kernel address space where a driver can
214 locate it and do whatever it wants with the memory, including
215 providing an interface to it for UML processes to use.
217 For more information, see
218 <http://user-mode-linux.sourceforge.net/iomem.html>.
220 If you'd like to be able to provide a simulated IO port space for
221 User-Mode Linux processes, say Y. If unsure, say N.
224 tristate "Loopback device support"
226 Saying Y here will allow you to use a regular file as a block
227 device; you can then create a file system on that block device and
228 mount it just as you would mount other block devices such as hard
229 drive partitions, CD-ROM drives or floppy drives. The loop devices
230 are block special device files with major number 7 and typically
231 called /dev/loop0, /dev/loop1 etc.
233 This is useful if you want to check an ISO 9660 file system before
234 burning the CD, or if you want to use floppy images without first
235 writing them to floppy. Furthermore, some Linux distributions avoid
236 the need for a dedicated Linux partition by keeping their complete
237 root file system inside a DOS FAT file using this loop device
240 To use the loop device, you need the losetup utility, found in the
241 util-linux package, see
242 <ftp://ftp.kernel.org/pub/linux/utils/util-linux/>.
244 The loop device driver can also be used to "hide" a file system in
245 a disk partition, floppy, or regular file, either using encryption
246 (scrambling the data) or steganography (hiding the data in the low
247 bits of, say, a sound file). This is also safe if the file resides
248 on a remote file server.
250 There are several ways of encrypting disks. Some of these require
251 kernel patches. The vanilla kernel offers the cryptoloop option
252 and a Device Mapper target (which is superior, as it supports all
253 file systems). If you want to use the cryptoloop, say Y to both
254 LOOP and CRYPTOLOOP, and make sure you have a recent (version 2.12
255 or later) version of util-linux. Additionally, be aware that
256 the cryptoloop is not safe for storing journaled filesystems.
258 Note that this loop device has nothing to do with the loopback
259 device used for network connections from the machine to itself.
261 To compile this driver as a module, choose M here: the
262 module will be called loop.
264 Most users will answer N here.
266 config BLK_DEV_CRYPTOLOOP
267 tristate "Cryptoloop Support"
270 depends on BLK_DEV_LOOP
272 Say Y here if you want to be able to use the ciphers that are
273 provided by the CryptoAPI as loop transformation. This might be
274 used as hard disk encryption.
276 WARNING: This device is not safe for journaled file systems like
277 ext3 or Reiserfs. Please use the Device Mapper crypto module
278 instead, which can be configured to be on-disk compatible with the
282 tristate "Network block device support"
285 Saying Y here will allow your computer to be a client for network
286 block devices, i.e. it will be able to use block devices exported by
287 servers (mount file systems on them etc.). Communication between
288 client and server works over TCP/IP networking, but to the client
289 program this is hidden: it looks like a regular local file access to
290 a block device special file such as /dev/nd0.
292 Network block devices also allows you to run a block-device in
293 userland (making server and client physically the same computer,
294 communicating using the loopback network device).
296 Read <file:Documentation/nbd.txt> for more information, especially
297 about where to find the server code, which runs in user space and
298 does not need special kernel support.
300 Note that this has nothing to do with the network file systems NFS
301 or Coda; you can say N here even if you intend to use NFS or Coda.
303 To compile this driver as a module, choose M here: the
304 module will be called nbd.
309 tristate "Promise SATA SX8 support"
312 Saying Y or M here will enable support for the
313 Promise SATA SX8 controllers.
315 Use devices /dev/sx8/$N and /dev/sx8/$Np$M.
318 tristate "Low Performance USB Block driver"
321 This driver supports certain USB attached storage devices
324 If you enable this driver, it is recommended to avoid conflicts
325 with usb-storage by enabling USB_LIBUSUAL.
330 tristate "RAM disk support"
332 Saying Y here will allow you to use a portion of your RAM memory as
333 a block device, so that you can make file systems on it, read and
334 write to it and do all the other things that you can do with normal
335 block devices (such as hard drives). It is usually used to load and
336 store a copy of a minimal root file system off of a floppy into RAM
337 during the initial install of Linux.
339 Note that the kernel command line option "ramdisk=XX" is now
340 obsolete. For details, read <file:Documentation/ramdisk.txt>.
342 To compile this driver as a module, choose M here: the
343 module will be called rd.
345 Most normal users won't need the RAM disk functionality, and can
348 config BLK_DEV_RAM_COUNT
349 int "Default number of RAM disks"
351 depends on BLK_DEV_RAM
353 The default value is 16 RAM disks. Change this if you know what
354 are doing. If you boot from a filesystem that needs to be extracted
355 in memory, you will need at least one RAM disk (e.g. root on cramfs).
357 config BLK_DEV_RAM_SIZE
358 int "Default RAM disk size (kbytes)"
359 depends on BLK_DEV_RAM
362 The default value is 4096 kilobytes. Only change this if you know
363 what are you doing. If you are using IBM S/390, then set this to
366 config BLK_DEV_RAM_BLOCKSIZE
367 int "Default RAM disk block size (bytes)"
368 depends on BLK_DEV_RAM
371 The default value is 1024 bytes. PAGE_SIZE is a much more
372 efficient choice however. The default is kept to ensure initrd
373 setups function - apparently needed by the rd_load_image routine
374 that supposes the filesystem in the image uses a 1024 blocksize.
377 tristate "Packet writing on CD/DVD media"
380 If you have a CDROM/DVD drive that supports packet writing, say
381 Y to include support. It should work with any MMC/Mt Fuji
382 compliant ATAPI or SCSI drive, which is just about any newer
385 Currently only writing to CD-RW, DVD-RW, DVD+RW and DVDRAM discs
387 DVD-RW disks must be in restricted overwrite mode.
389 See the file <file:Documentation/cdrom/packet-writing.txt>
390 for further information on the use of this driver.
392 To compile this driver as a module, choose M here: the
393 module will be called pktcdvd.
395 config CDROM_PKTCDVD_BUFFERS
396 int "Free buffers for data gathering"
397 depends on CDROM_PKTCDVD
400 This controls the maximum number of active concurrent packets. More
401 concurrent packets can increase write performance, but also require
402 more memory. Each concurrent packet will require approximately 64Kb
403 of non-swappable kernel memory, memory which will be allocated when
404 a disc is opened for writing.
406 config CDROM_PKTCDVD_WCACHE
407 bool "Enable write caching (EXPERIMENTAL)"
408 depends on CDROM_PKTCDVD && EXPERIMENTAL
410 If enabled, write caching will be set for the CD-R/W device. For now
411 this option is dangerous unless the CD-RW media is known good, as we
412 don't do deferred write error handling yet.
415 tristate "ATA over Ethernet support"
418 This driver provides Support for ATA over Ethernet block
419 devices like the Coraid EtherDrive (R) Storage Blade.
422 tristate "Sun Virtual Disk Client support"
425 Support for virtual disk devices as a client under Sun
428 source "drivers/s390/block/Kconfig"
431 tristate "Xilinx SystemACE support"
434 Include support for the Xilinx SystemACE CompactFlash interface
436 config XEN_BLKDEV_FRONTEND
437 tristate "Xen virtual block device support"
441 This driver implements the front-end of the Xen virtual
442 block device driver. It communicates with a back-end driver
443 in another domain which drives the actual block device.