1# 2# Block device driver configuration 3# 4 5menuconfig BLK_DEV 6 bool "Block devices" 7 depends on BLOCK 8 default y 9 ---help--- 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. 12 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. 15 16if BLK_DEV 17 18config BLK_DEV_FD 19 tristate "Normal floppy disk support" 20 depends on ARCH_MAY_HAVE_PC_FDC 21 ---help--- 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. 29 30 To compile this driver as a module, choose M here: the 31 module will be called floppy. 32 33config AMIGA_FLOPPY 34 tristate "Amiga floppy support" 35 depends on AMIGA 36 37config ATARI_FLOPPY 38 tristate "Atari floppy support" 39 depends on ATARI 40 41config MAC_FLOPPY 42 tristate "Support for PowerMac floppy" 43 depends on PPC_PMAC && !PPC_PMAC64 44 help 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. 47 48config BLK_DEV_SWIM 49 tristate "Support for SWIM Macintosh floppy" 50 depends on M68K && MAC 51 help 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. 54 55config AMIGA_Z2RAM 56 tristate "Amiga Zorro II ramdisk support" 57 depends on ZORRO 58 help 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 61 driver in the kernel. 62 63 To compile this driver as a module, choose M here: the 64 module will be called z2ram. 65 66config BLK_DEV_XD 67 tristate "XT hard disk support" 68 depends on ISA && ISA_DMA_API 69 select CHECK_SIGNATURE 70 help 71 Very old 8 bit hard disk controllers used in the IBM XT computer 72 will be supported if you say Y here. 73 74 To compile this driver as a module, choose M here: the 75 module will be called xd. 76 77 It's pretty unlikely that you have one of these: say N. 78 79config GDROM 80 tristate "SEGA Dreamcast GD-ROM drive" 81 depends on SH_DREAMCAST 82 help 83 A standard SEGA Dreamcast comes with a modified CD ROM drive called a 84 "GD-ROM" by SEGA to signify it is capable of reading special disks 85 with up to 1 GB of data. This drive will also read standard CD ROM 86 disks. Select this option to access any disks in your GD ROM drive. 87 Most users will want to say "Y" here. 88 You can also build this as a module which will be called gdrom. 89 90config PARIDE 91 tristate "Parallel port IDE device support" 92 depends on PARPORT_PC 93 ---help--- 94 There are many external CD-ROM and disk devices that connect through 95 your computer's parallel port. Most of them are actually IDE devices 96 using a parallel port IDE adapter. This option enables the PARIDE 97 subsystem which contains drivers for many of these external drives. 98 Read <file:Documentation/blockdev/paride.txt> for more information. 99 100 If you have said Y to the "Parallel-port support" configuration 101 option, you may share a single port between your printer and other 102 parallel port devices. Answer Y to build PARIDE support into your 103 kernel, or M if you would like to build it as a loadable module. If 104 your parallel port support is in a loadable module, you must build 105 PARIDE as a module. If you built PARIDE support into your kernel, 106 you may still build the individual protocol modules and high-level 107 drivers as loadable modules. If you build this support as a module, 108 it will be called paride. 109 110 To use the PARIDE support, you must say Y or M here and also to at 111 least one high-level driver (e.g. "Parallel port IDE disks", 112 "Parallel port ATAPI CD-ROMs", "Parallel port ATAPI disks" etc.) and 113 to at least one protocol driver (e.g. "ATEN EH-100 protocol", 114 "MicroSolutions backpack protocol", "DataStor Commuter protocol" 115 etc.). 116 117source "drivers/block/paride/Kconfig" 118 119config BLK_CPQ_DA 120 tristate "Compaq SMART2 support" 121 depends on PCI && VIRT_TO_BUS 122 help 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 127 use of this driver. 128 129config BLK_CPQ_CISS_DA 130 tristate "Compaq Smart Array 5xxx support" 131 depends on PCI 132 help 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. 138 139config 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 143 help 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.) 147 148 "SCSI support" and "SCSI tape support" must also be enabled for this 149 option to work. 150 151 When this option is disabled (N), the SCSI portion of the driver 152 is not compiled. 153 154config BLK_DEV_DAC960 155 tristate "Mylex DAC960/DAC1100 PCI RAID Controller support" 156 depends on PCI 157 help 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 161 about this driver. 162 163 To compile this driver as a module, choose M here: the 164 module will be called DAC960. 165 166config BLK_DEV_UMEM 167 tristate "Micro Memory MM5415 Battery Backed RAM support (EXPERIMENTAL)" 168 depends on PCI && EXPERIMENTAL 169 ---help--- 170 Saying Y here will include support for the MM5415 family of 171 battery backed (Non-volatile) RAM cards. 172 <http://www.umem.com/> 173 174 The cards appear as block devices that can be partitioned into 175 as many as 15 partitions. 176 177 To compile this driver as a module, choose M here: the 178 module will be called umem. 179 180 The umem driver has not yet been allocated a MAJOR number, so 181 one is chosen dynamically. 182 183config BLK_DEV_UBD 184 bool "Virtual block device" 185 depends on UML 186 ---help--- 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 190 Y here. 191 192config BLK_DEV_UBD_SYNC 193 bool "Always do synchronous disk IO for UBD" 194 depends on BLK_DEV_UBD 195 ---help--- 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 199 computer crashes. 200 201 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. 205 206 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. 211 212config BLK_DEV_COW_COMMON 213 bool 214 default BLK_DEV_UBD 215 216config BLK_DEV_LOOP 217 tristate "Loopback device support" 218 ---help--- 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. 225 226 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 231 driver. 232 233 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/>. 236 237 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. 242 243 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. 250 251 Note that this loop device has nothing to do with the loopback 252 device used for network connections from the machine to itself. 253 254 To compile this driver as a module, choose M here: the 255 module will be called loop. 256 257 Most users will answer N here. 258 259config BLK_DEV_LOOP_MIN_COUNT 260 int "Number of loop devices to pre-create at init time" 261 depends on BLK_DEV_LOOP 262 default 8 263 help 264 Static number of loop devices to be unconditionally pre-created 265 at init time. 266 267 This default value can be overwritten on the kernel command 268 line or with module-parameter loop.max_loop. 269 270 The historic default is 8. If a late 2011 version of losetup(8) 271 is used, it can be set to 0, since needed loop devices can be 272 dynamically allocated with the /dev/loop-control interface. 273 274config BLK_DEV_CRYPTOLOOP 275 tristate "Cryptoloop Support" 276 select CRYPTO 277 select CRYPTO_CBC 278 depends on BLK_DEV_LOOP 279 ---help--- 280 Say Y here if you want to be able to use the ciphers that are 281 provided by the CryptoAPI as loop transformation. This might be 282 used as hard disk encryption. 283 284 WARNING: This device is not safe for journaled file systems like 285 ext3 or Reiserfs. Please use the Device Mapper crypto module 286 instead, which can be configured to be on-disk compatible with the 287 cryptoloop device. 288 289source "drivers/block/drbd/Kconfig" 290 291config BLK_DEV_NBD 292 tristate "Network block device support" 293 depends on NET 294 ---help--- 295 Saying Y here will allow your computer to be a client for network 296 block devices, i.e. it will be able to use block devices exported by 297 servers (mount file systems on them etc.). Communication between 298 client and server works over TCP/IP networking, but to the client 299 program this is hidden: it looks like a regular local file access to 300 a block device special file such as /dev/nd0. 301 302 Network block devices also allows you to run a block-device in 303 userland (making server and client physically the same computer, 304 communicating using the loopback network device). 305 306 Read <file:Documentation/blockdev/nbd.txt> for more information, 307 especially about where to find the server code, which runs in user 308 space and does not need special kernel support. 309 310 Note that this has nothing to do with the network file systems NFS 311 or Coda; you can say N here even if you intend to use NFS or Coda. 312 313 To compile this driver as a module, choose M here: the 314 module will be called nbd. 315 316 If unsure, say N. 317 318config BLK_DEV_OSD 319 tristate "OSD object-as-blkdev support" 320 depends on SCSI_OSD_ULD 321 ---help--- 322 Saying Y or M here will allow the exporting of a single SCSI 323 OSD (object-based storage) object as a Linux block device. 324 325 For example, if you create a 2G object on an OSD device, 326 you can then use this module to present that 2G object as 327 a Linux block device. 328 329 To compile this driver as a module, choose M here: the 330 module will be called osdblk. 331 332 If unsure, say N. 333 334config BLK_DEV_SX8 335 tristate "Promise SATA SX8 support" 336 depends on PCI 337 ---help--- 338 Saying Y or M here will enable support for the 339 Promise SATA SX8 controllers. 340 341 Use devices /dev/sx8/$N and /dev/sx8/$Np$M. 342 343config BLK_DEV_UB 344 tristate "Low Performance USB Block driver" 345 depends on USB 346 help 347 This driver supports certain USB attached storage devices 348 such as flash keys. 349 350 If you enable this driver, it is recommended to avoid conflicts 351 with usb-storage by enabling USB_LIBUSUAL. 352 353 If unsure, say N. 354 355config BLK_DEV_RAM 356 tristate "RAM block device support" 357 ---help--- 358 Saying Y here will allow you to use a portion of your RAM memory as 359 a block device, so that you can make file systems on it, read and 360 write to it and do all the other things that you can do with normal 361 block devices (such as hard drives). It is usually used to load and 362 store a copy of a minimal root file system off of a floppy into RAM 363 during the initial install of Linux. 364 365 Note that the kernel command line option "ramdisk=XX" is now obsolete. 366 For details, read <file:Documentation/blockdev/ramdisk.txt>. 367 368 To compile this driver as a module, choose M here: the 369 module will be called rd. 370 371 Most normal users won't need the RAM disk functionality, and can 372 thus say N here. 373 374config BLK_DEV_RAM_COUNT 375 int "Default number of RAM disks" 376 default "16" 377 depends on BLK_DEV_RAM 378 help 379 The default value is 16 RAM disks. Change this if you know what you 380 are doing. If you boot from a filesystem that needs to be extracted 381 in memory, you will need at least one RAM disk (e.g. root on cramfs). 382 383config BLK_DEV_RAM_SIZE 384 int "Default RAM disk size (kbytes)" 385 depends on BLK_DEV_RAM 386 default "4096" 387 help 388 The default value is 4096 kilobytes. Only change this if you know 389 what you are doing. 390 391config BLK_DEV_XIP 392 bool "Support XIP filesystems on RAM block device" 393 depends on BLK_DEV_RAM 394 default n 395 help 396 Support XIP filesystems (such as ext2 with XIP support on) on 397 top of block ram device. This will slightly enlarge the kernel, and 398 will prevent RAM block device backing store memory from being 399 allocated from highmem (only a problem for highmem systems). 400 401config CDROM_PKTCDVD 402 tristate "Packet writing on CD/DVD media" 403 depends on !UML 404 help 405 If you have a CDROM/DVD drive that supports packet writing, say 406 Y to include support. It should work with any MMC/Mt Fuji 407 compliant ATAPI or SCSI drive, which is just about any newer 408 DVD/CD writer. 409 410 Currently only writing to CD-RW, DVD-RW, DVD+RW and DVDRAM discs 411 is possible. 412 DVD-RW disks must be in restricted overwrite mode. 413 414 See the file <file:Documentation/cdrom/packet-writing.txt> 415 for further information on the use of this driver. 416 417 To compile this driver as a module, choose M here: the 418 module will be called pktcdvd. 419 420config CDROM_PKTCDVD_BUFFERS 421 int "Free buffers for data gathering" 422 depends on CDROM_PKTCDVD 423 default "8" 424 help 425 This controls the maximum number of active concurrent packets. More 426 concurrent packets can increase write performance, but also require 427 more memory. Each concurrent packet will require approximately 64Kb 428 of non-swappable kernel memory, memory which will be allocated when 429 a disc is opened for writing. 430 431config CDROM_PKTCDVD_WCACHE 432 bool "Enable write caching (EXPERIMENTAL)" 433 depends on CDROM_PKTCDVD && EXPERIMENTAL 434 help 435 If enabled, write caching will be set for the CD-R/W device. For now 436 this option is dangerous unless the CD-RW media is known good, as we 437 don't do deferred write error handling yet. 438 439config ATA_OVER_ETH 440 tristate "ATA over Ethernet support" 441 depends on NET 442 help 443 This driver provides Support for ATA over Ethernet block 444 devices like the Coraid EtherDrive (R) Storage Blade. 445 446config MG_DISK 447 tristate "mGine mflash, gflash support" 448 depends on ARM && GPIOLIB 449 help 450 mGine mFlash(gFlash) block device driver 451 452config MG_DISK_RES 453 int "Size of reserved area before MBR" 454 depends on MG_DISK 455 default 0 456 help 457 Define size of reserved area that usually used for boot. Unit is KB. 458 All of the block device operation will be taken this value as start 459 offset 460 Examples: 461 1024 => 1 MB 462 463config SUNVDC 464 tristate "Sun Virtual Disk Client support" 465 depends on SUN_LDOMS 466 help 467 Support for virtual disk devices as a client under Sun 468 Logical Domains. 469 470source "drivers/s390/block/Kconfig" 471 472config XILINX_SYSACE 473 tristate "Xilinx SystemACE support" 474 depends on 4xx || MICROBLAZE 475 help 476 Include support for the Xilinx SystemACE CompactFlash interface 477 478config XEN_BLKDEV_FRONTEND 479 tristate "Xen virtual block device support" 480 depends on XEN 481 default y 482 select XEN_XENBUS_FRONTEND 483 help 484 This driver implements the front-end of the Xen virtual 485 block device driver. It communicates with a back-end driver 486 in another domain which drives the actual block device. 487 488config XEN_BLKDEV_BACKEND 489 tristate "Xen block-device backend driver" 490 depends on XEN_BACKEND 491 help 492 The block-device backend driver allows the kernel to export its 493 block devices to other guests via a high-performance shared-memory 494 interface. 495 496 The corresponding Linux frontend driver is enabled by the 497 CONFIG_XEN_BLKDEV_FRONTEND configuration option. 498 499 The backend driver attaches itself to a any block device specified 500 in the XenBus configuration. There are no limits to what the block 501 device as long as it has a major and minor. 502 503 If you are compiling a kernel to run in a Xen block backend driver 504 domain (often this is domain 0) you should say Y here. To 505 compile this driver as a module, chose M here: the module 506 will be called xen-blkback. 507 508 509config VIRTIO_BLK 510 tristate "Virtio block driver (EXPERIMENTAL)" 511 depends on EXPERIMENTAL && VIRTIO 512 ---help--- 513 This is the virtual block driver for virtio. It can be used with 514 lguest or QEMU based VMMs (like KVM or Xen). Say Y or M. 515 516config BLK_DEV_HD 517 bool "Very old hard disk (MFM/RLL/IDE) driver" 518 depends on HAVE_IDE 519 depends on !ARM || ARCH_RPC || ARCH_SHARK || BROKEN 520 help 521 This is a very old hard disk driver that lacks the enhanced 522 functionality of the newer ones. 523 524 It is required for systems with ancient MFM/RLL/ESDI drives. 525 526 If unsure, say N. 527 528config BLK_DEV_RBD 529 tristate "Rados block device (RBD)" 530 depends on INET && EXPERIMENTAL && BLOCK 531 select CEPH_LIB 532 select LIBCRC32C 533 select CRYPTO_AES 534 select CRYPTO 535 default n 536 help 537 Say Y here if you want include the Rados block device, which stripes 538 a block device over objects stored in the Ceph distributed object 539 store. 540 541 More information at http://ceph.newdream.net/. 542 543 If unsure, say N. 544 545endif # BLK_DEV 546