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 119source "drivers/block/mtip32xx/Kconfig" 120 121config BLK_CPQ_DA 122 tristate "Compaq SMART2 support" 123 depends on PCI && VIRT_TO_BUS 124 help 125 This is the driver for Compaq Smart Array controllers. Everyone 126 using these boards should say Y here. See the file 127 <file:Documentation/blockdev/cpqarray.txt> for the current list of 128 boards supported by this driver, and for further information on the 129 use of this driver. 130 131config BLK_CPQ_CISS_DA 132 tristate "Compaq Smart Array 5xxx support" 133 depends on PCI 134 help 135 This is the driver for Compaq Smart Array 5xxx controllers. 136 Everyone using these boards should say Y here. 137 See <file:Documentation/blockdev/cciss.txt> for the current list of 138 boards supported by this driver, and for further information 139 on the use of this driver. 140 141config CISS_SCSI_TAPE 142 bool "SCSI tape drive support for Smart Array 5xxx" 143 depends on BLK_CPQ_CISS_DA && PROC_FS 144 depends on SCSI=y || SCSI=BLK_CPQ_CISS_DA 145 help 146 When enabled (Y), this option allows SCSI tape drives and SCSI medium 147 changers (tape robots) to be accessed via a Compaq 5xxx array 148 controller. (See <file:Documentation/blockdev/cciss.txt> for more details.) 149 150 "SCSI support" and "SCSI tape support" must also be enabled for this 151 option to work. 152 153 When this option is disabled (N), the SCSI portion of the driver 154 is not compiled. 155 156config BLK_DEV_DAC960 157 tristate "Mylex DAC960/DAC1100 PCI RAID Controller support" 158 depends on PCI 159 help 160 This driver adds support for the Mylex DAC960, AcceleRAID, and 161 eXtremeRAID PCI RAID controllers. See the file 162 <file:Documentation/blockdev/README.DAC960> for further information 163 about this driver. 164 165 To compile this driver as a module, choose M here: the 166 module will be called DAC960. 167 168config BLK_DEV_UMEM 169 tristate "Micro Memory MM5415 Battery Backed RAM support (EXPERIMENTAL)" 170 depends on PCI && EXPERIMENTAL 171 ---help--- 172 Saying Y here will include support for the MM5415 family of 173 battery backed (Non-volatile) RAM cards. 174 <http://www.umem.com/> 175 176 The cards appear as block devices that can be partitioned into 177 as many as 15 partitions. 178 179 To compile this driver as a module, choose M here: the 180 module will be called umem. 181 182 The umem driver has not yet been allocated a MAJOR number, so 183 one is chosen dynamically. 184 185config BLK_DEV_UBD 186 bool "Virtual block device" 187 depends on UML 188 ---help--- 189 The User-Mode Linux port includes a driver called UBD which will let 190 you access arbitrary files on the host computer as block devices. 191 Unless you know that you do not need such virtual block devices say 192 Y here. 193 194config BLK_DEV_UBD_SYNC 195 bool "Always do synchronous disk IO for UBD" 196 depends on BLK_DEV_UBD 197 ---help--- 198 Writes to the virtual block device are not immediately written to the 199 host's disk; this may cause problems if, for example, the User-Mode 200 Linux 'Virtual Machine' uses a journalling filesystem and the host 201 computer crashes. 202 203 Synchronous operation (i.e. always writing data to the host's disk 204 immediately) is configurable on a per-UBD basis by using a special 205 kernel command line option. Alternatively, you can say Y here to 206 turn on synchronous operation by default for all block devices. 207 208 If you're running a journalling file system (like reiserfs, for 209 example) in your virtual machine, you will want to say Y here. If 210 you care for the safety of the data in your virtual machine, Y is a 211 wise choice too. In all other cases (for example, if you're just 212 playing around with User-Mode Linux) you can choose N. 213 214config BLK_DEV_COW_COMMON 215 bool 216 default BLK_DEV_UBD 217 218config BLK_DEV_LOOP 219 tristate "Loopback device support" 220 ---help--- 221 Saying Y here will allow you to use a regular file as a block 222 device; you can then create a file system on that block device and 223 mount it just as you would mount other block devices such as hard 224 drive partitions, CD-ROM drives or floppy drives. The loop devices 225 are block special device files with major number 7 and typically 226 called /dev/loop0, /dev/loop1 etc. 227 228 This is useful if you want to check an ISO 9660 file system before 229 burning the CD, or if you want to use floppy images without first 230 writing them to floppy. Furthermore, some Linux distributions avoid 231 the need for a dedicated Linux partition by keeping their complete 232 root file system inside a DOS FAT file using this loop device 233 driver. 234 235 To use the loop device, you need the losetup utility, found in the 236 util-linux package, see 237 <ftp://ftp.kernel.org/pub/linux/utils/util-linux/>. 238 239 The loop device driver can also be used to "hide" a file system in 240 a disk partition, floppy, or regular file, either using encryption 241 (scrambling the data) or steganography (hiding the data in the low 242 bits of, say, a sound file). This is also safe if the file resides 243 on a remote file server. 244 245 There are several ways of encrypting disks. Some of these require 246 kernel patches. The vanilla kernel offers the cryptoloop option 247 and a Device Mapper target (which is superior, as it supports all 248 file systems). If you want to use the cryptoloop, say Y to both 249 LOOP and CRYPTOLOOP, and make sure you have a recent (version 2.12 250 or later) version of util-linux. Additionally, be aware that 251 the cryptoloop is not safe for storing journaled filesystems. 252 253 Note that this loop device has nothing to do with the loopback 254 device used for network connections from the machine to itself. 255 256 To compile this driver as a module, choose M here: the 257 module will be called loop. 258 259 Most users will answer N here. 260 261config BLK_DEV_LOOP_MIN_COUNT 262 int "Number of loop devices to pre-create at init time" 263 depends on BLK_DEV_LOOP 264 default 8 265 help 266 Static number of loop devices to be unconditionally pre-created 267 at init time. 268 269 This default value can be overwritten on the kernel command 270 line or with module-parameter loop.max_loop. 271 272 The historic default is 8. If a late 2011 version of losetup(8) 273 is used, it can be set to 0, since needed loop devices can be 274 dynamically allocated with the /dev/loop-control interface. 275 276config BLK_DEV_CRYPTOLOOP 277 tristate "Cryptoloop Support" 278 select CRYPTO 279 select CRYPTO_CBC 280 depends on BLK_DEV_LOOP 281 ---help--- 282 Say Y here if you want to be able to use the ciphers that are 283 provided by the CryptoAPI as loop transformation. This might be 284 used as hard disk encryption. 285 286 WARNING: This device is not safe for journaled file systems like 287 ext3 or Reiserfs. Please use the Device Mapper crypto module 288 instead, which can be configured to be on-disk compatible with the 289 cryptoloop device. 290 291source "drivers/block/drbd/Kconfig" 292 293config BLK_DEV_NBD 294 tristate "Network block device support" 295 depends on NET 296 ---help--- 297 Saying Y here will allow your computer to be a client for network 298 block devices, i.e. it will be able to use block devices exported by 299 servers (mount file systems on them etc.). Communication between 300 client and server works over TCP/IP networking, but to the client 301 program this is hidden: it looks like a regular local file access to 302 a block device special file such as /dev/nd0. 303 304 Network block devices also allows you to run a block-device in 305 userland (making server and client physically the same computer, 306 communicating using the loopback network device). 307 308 Read <file:Documentation/blockdev/nbd.txt> for more information, 309 especially about where to find the server code, which runs in user 310 space and does not need special kernel support. 311 312 Note that this has nothing to do with the network file systems NFS 313 or Coda; you can say N here even if you intend to use NFS or Coda. 314 315 To compile this driver as a module, choose M here: the 316 module will be called nbd. 317 318 If unsure, say N. 319 320config BLK_DEV_NVME 321 tristate "NVM Express block device" 322 depends on PCI 323 ---help--- 324 The NVM Express driver is for solid state drives directly 325 connected to the PCI or PCI Express bus. If you know you 326 don't have one of these, it is safe to answer N. 327 328 To compile this driver as a module, choose M here: the 329 module will be called nvme. 330 331config BLK_DEV_OSD 332 tristate "OSD object-as-blkdev support" 333 depends on SCSI_OSD_ULD 334 ---help--- 335 Saying Y or M here will allow the exporting of a single SCSI 336 OSD (object-based storage) object as a Linux block device. 337 338 For example, if you create a 2G object on an OSD device, 339 you can then use this module to present that 2G object as 340 a Linux block device. 341 342 To compile this driver as a module, choose M here: the 343 module will be called osdblk. 344 345 If unsure, say N. 346 347config BLK_DEV_SX8 348 tristate "Promise SATA SX8 support" 349 depends on PCI 350 ---help--- 351 Saying Y or M here will enable support for the 352 Promise SATA SX8 controllers. 353 354 Use devices /dev/sx8/$N and /dev/sx8/$Np$M. 355 356config BLK_DEV_UB 357 tristate "Low Performance USB Block driver" 358 depends on USB 359 help 360 This driver supports certain USB attached storage devices 361 such as flash keys. 362 363 If you enable this driver, it is recommended to avoid conflicts 364 with usb-storage by enabling USB_LIBUSUAL. 365 366 If unsure, say N. 367 368config BLK_DEV_RAM 369 tristate "RAM block device support" 370 ---help--- 371 Saying Y here will allow you to use a portion of your RAM memory as 372 a block device, so that you can make file systems on it, read and 373 write to it and do all the other things that you can do with normal 374 block devices (such as hard drives). It is usually used to load and 375 store a copy of a minimal root file system off of a floppy into RAM 376 during the initial install of Linux. 377 378 Note that the kernel command line option "ramdisk=XX" is now obsolete. 379 For details, read <file:Documentation/blockdev/ramdisk.txt>. 380 381 To compile this driver as a module, choose M here: the 382 module will be called rd. 383 384 Most normal users won't need the RAM disk functionality, and can 385 thus say N here. 386 387config BLK_DEV_RAM_COUNT 388 int "Default number of RAM disks" 389 default "16" 390 depends on BLK_DEV_RAM 391 help 392 The default value is 16 RAM disks. Change this if you know what you 393 are doing. If you boot from a filesystem that needs to be extracted 394 in memory, you will need at least one RAM disk (e.g. root on cramfs). 395 396config BLK_DEV_RAM_SIZE 397 int "Default RAM disk size (kbytes)" 398 depends on BLK_DEV_RAM 399 default "4096" 400 help 401 The default value is 4096 kilobytes. Only change this if you know 402 what you are doing. 403 404config BLK_DEV_XIP 405 bool "Support XIP filesystems on RAM block device" 406 depends on BLK_DEV_RAM 407 default n 408 help 409 Support XIP filesystems (such as ext2 with XIP support on) on 410 top of block ram device. This will slightly enlarge the kernel, and 411 will prevent RAM block device backing store memory from being 412 allocated from highmem (only a problem for highmem systems). 413 414config CDROM_PKTCDVD 415 tristate "Packet writing on CD/DVD media" 416 depends on !UML 417 help 418 If you have a CDROM/DVD drive that supports packet writing, say 419 Y to include support. It should work with any MMC/Mt Fuji 420 compliant ATAPI or SCSI drive, which is just about any newer 421 DVD/CD writer. 422 423 Currently only writing to CD-RW, DVD-RW, DVD+RW and DVDRAM discs 424 is possible. 425 DVD-RW disks must be in restricted overwrite mode. 426 427 See the file <file:Documentation/cdrom/packet-writing.txt> 428 for further information on the use of this driver. 429 430 To compile this driver as a module, choose M here: the 431 module will be called pktcdvd. 432 433config CDROM_PKTCDVD_BUFFERS 434 int "Free buffers for data gathering" 435 depends on CDROM_PKTCDVD 436 default "8" 437 help 438 This controls the maximum number of active concurrent packets. More 439 concurrent packets can increase write performance, but also require 440 more memory. Each concurrent packet will require approximately 64Kb 441 of non-swappable kernel memory, memory which will be allocated when 442 a disc is opened for writing. 443 444config CDROM_PKTCDVD_WCACHE 445 bool "Enable write caching (EXPERIMENTAL)" 446 depends on CDROM_PKTCDVD && EXPERIMENTAL 447 help 448 If enabled, write caching will be set for the CD-R/W device. For now 449 this option is dangerous unless the CD-RW media is known good, as we 450 don't do deferred write error handling yet. 451 452config ATA_OVER_ETH 453 tristate "ATA over Ethernet support" 454 depends on NET 455 help 456 This driver provides Support for ATA over Ethernet block 457 devices like the Coraid EtherDrive (R) Storage Blade. 458 459config MG_DISK 460 tristate "mGine mflash, gflash support" 461 depends on ARM && GPIOLIB 462 help 463 mGine mFlash(gFlash) block device driver 464 465config MG_DISK_RES 466 int "Size of reserved area before MBR" 467 depends on MG_DISK 468 default 0 469 help 470 Define size of reserved area that usually used for boot. Unit is KB. 471 All of the block device operation will be taken this value as start 472 offset 473 Examples: 474 1024 => 1 MB 475 476config SUNVDC 477 tristate "Sun Virtual Disk Client support" 478 depends on SUN_LDOMS 479 help 480 Support for virtual disk devices as a client under Sun 481 Logical Domains. 482 483source "drivers/s390/block/Kconfig" 484 485config XILINX_SYSACE 486 tristate "Xilinx SystemACE support" 487 depends on 4xx || MICROBLAZE 488 help 489 Include support for the Xilinx SystemACE CompactFlash interface 490 491config XEN_BLKDEV_FRONTEND 492 tristate "Xen virtual block device support" 493 depends on XEN 494 default y 495 select XEN_XENBUS_FRONTEND 496 help 497 This driver implements the front-end of the Xen virtual 498 block device driver. It communicates with a back-end driver 499 in another domain which drives the actual block device. 500 501config XEN_BLKDEV_BACKEND 502 tristate "Xen block-device backend driver" 503 depends on XEN_BACKEND 504 help 505 The block-device backend driver allows the kernel to export its 506 block devices to other guests via a high-performance shared-memory 507 interface. 508 509 The corresponding Linux frontend driver is enabled by the 510 CONFIG_XEN_BLKDEV_FRONTEND configuration option. 511 512 The backend driver attaches itself to a any block device specified 513 in the XenBus configuration. There are no limits to what the block 514 device as long as it has a major and minor. 515 516 If you are compiling a kernel to run in a Xen block backend driver 517 domain (often this is domain 0) you should say Y here. To 518 compile this driver as a module, chose M here: the module 519 will be called xen-blkback. 520 521 522config VIRTIO_BLK 523 tristate "Virtio block driver (EXPERIMENTAL)" 524 depends on EXPERIMENTAL && VIRTIO 525 ---help--- 526 This is the virtual block driver for virtio. It can be used with 527 lguest or QEMU based VMMs (like KVM or Xen). Say Y or M. 528 529config BLK_DEV_HD 530 bool "Very old hard disk (MFM/RLL/IDE) driver" 531 depends on HAVE_IDE 532 depends on !ARM || ARCH_RPC || ARCH_SHARK || BROKEN 533 help 534 This is a very old hard disk driver that lacks the enhanced 535 functionality of the newer ones. 536 537 It is required for systems with ancient MFM/RLL/ESDI drives. 538 539 If unsure, say N. 540 541config BLK_DEV_RBD 542 tristate "Rados block device (RBD)" 543 depends on INET && EXPERIMENTAL && BLOCK 544 select CEPH_LIB 545 select LIBCRC32C 546 select CRYPTO_AES 547 select CRYPTO 548 default n 549 help 550 Say Y here if you want include the Rados block device, which stripes 551 a block device over objects stored in the Ceph distributed object 552 store. 553 554 More information at http://ceph.newdream.net/. 555 556 If unsure, say N. 557 558endif # BLK_DEV 559