Kconfig revision 61d48c2c31799ab9dbddbbcfccfd8042a5c6b75a
11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds# 21da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds# Block device driver configuration 31da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds# 41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 59361401eb7619c033e2394e4f9f6d410d6719ac7David Howellsif BLOCK 69361401eb7619c033e2394e4f9f6d410d6719ac7David Howells 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmenu "Block devices" 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig BLK_DEV_FD 101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tristate "Normal floppy disk support" 11a08b6b7968e7a6afc75e365ac31830867275abdcAl Viro depends on ARCH_MAY_HAVE_PC_FDC 121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ---help--- 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds If you want to use the floppy disk drive(s) of your PC under Linux, 141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds say Y. Information about this driver, especially important for IBM 151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Thinkpad users, is contained in <file:Documentation/floppy.txt>. 161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds That file also contains the location of the Floppy driver FAQ as 171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds well as location of the fdutils package used to configure additional 181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds parameters of the driver at run time. 191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds To compile this driver as a module, choose M here: the 211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds module will be called floppy. 221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig AMIGA_FLOPPY 241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tristate "Amiga floppy support" 251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds depends on AMIGA 261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig ATARI_FLOPPY 281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tristate "Atari floppy support" 291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds depends on ATARI 301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig MAC_FLOPPY 321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tristate "Support for PowerMac floppy" 331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds depends on PPC_PMAC && !PPC_PMAC64 341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds help 351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds If you have a SWIM-3 (Super Woz Integrated Machine 3; from Apple) 361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds floppy controller, say Y here. Most commonly found in PowerMacs. 371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig BLK_DEV_PS2 391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tristate "PS/2 ESDI hard disk support" 401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds depends on MCA && MCA_LEGACY && BROKEN 411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds help 421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Say Y here if you have a PS/2 machine with a MCA bus and an ESDI 431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds hard disk. 441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds To compile this driver as a module, choose M here: the 461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds module will be called ps2esdi. 471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig AMIGA_Z2RAM 491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tristate "Amiga Zorro II ramdisk support" 501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds depends on ZORRO 511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds help 521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds This enables support for using Chip RAM and Zorro II RAM as a 531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ramdisk or as a swap partition. Say Y if you want to include this 541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds driver in the kernel. 551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds To compile this driver as a module, choose M here: the 571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds module will be called z2ram. 581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig ATARI_ACSI 601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tristate "Atari ACSI support" 611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds depends on ATARI && BROKEN 621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ---help--- 631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds This enables support for the Atari ACSI interface. The driver 641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds supports hard disks and CD-ROMs, which have 512-byte sectors, or can 651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds be switched to that mode. Due to the ACSI command format, only disks 661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds up to 1 GB are supported. Special support for certain ACSI to SCSI 671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds adapters, which could relax that, isn't included yet. The ACSI 681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds driver is also the basis for certain other drivers for devices 691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds attached to the ACSI bus: Atari SLM laser printer, BioNet-100 701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Ethernet, and PAMsNet Ethernet. If you want to use one of these 711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds devices, you need ACSI support, too. 721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds To compile this driver as a module, choose M here: the 741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds module will be called acsi. 751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldscomment "Some devices (e.g. CD jukebox) support multiple LUNs" 771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds depends on ATARI && ATARI_ACSI 781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig ACSI_MULTI_LUN 801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds bool "Probe all LUNs on each ACSI device" 811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds depends on ATARI_ACSI 821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds help 831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds If you have a ACSI device that supports more than one LUN (Logical 841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Unit Number), e.g. a CD jukebox, you should say Y here so that all 851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds will be found by the ACSI driver. An ACSI device with multiple LUNs 861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds acts logically like multiple ACSI devices. The vast majority of ACSI 871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds devices have only one LUN, and so most people can say N here and 881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds should in fact do so, because it is safer. 891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig ATARI_SLM 911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tristate "Atari SLM laser printer support" 921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds depends on ATARI && ATARI_ACSI!=n 931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds help 941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds If you have an Atari SLM laser printer, say Y to include support for 951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds it in the kernel. Otherwise, say N. This driver is also available as 961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds a module ( = code which can be inserted in and removed from the 971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds running kernel whenever you want). The module will be called 981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds acsi_slm. Be warned: the driver needs much ST-RAM and can cause 991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds problems due to that fact! 1001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig BLK_DEV_XD 1021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tristate "XT hard disk support" 103a553260618d88c4790daec7975c88f3db1080b5bAl Viro depends on ISA && ISA_DMA_API 1041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds help 1051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Very old 8 bit hard disk controllers used in the IBM XT computer 1061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds will be supported if you say Y here. 1071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds To compile this driver as a module, choose M here: the 1091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds module will be called xd. 1101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds It's pretty unlikely that you have one of these: say N. 1121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig PARIDE 1141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tristate "Parallel port IDE device support" 1156a19b41b35bf45fc27a46dccf26005b3f44c1aa1Marko Kohtala depends on PARPORT_PC 1161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ---help--- 1171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds There are many external CD-ROM and disk devices that connect through 1181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds your computer's parallel port. Most of them are actually IDE devices 1191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds using a parallel port IDE adapter. This option enables the PARIDE 1201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds subsystem which contains drivers for many of these external drives. 1211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Read <file:Documentation/paride.txt> for more information. 1221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds If you have said Y to the "Parallel-port support" configuration 1241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds option, you may share a single port between your printer and other 1251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds parallel port devices. Answer Y to build PARIDE support into your 1261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kernel, or M if you would like to build it as a loadable module. If 1271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds your parallel port support is in a loadable module, you must build 1281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds PARIDE as a module. If you built PARIDE support into your kernel, 1291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds you may still build the individual protocol modules and high-level 1301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds drivers as loadable modules. If you build this support as a module, 1311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds it will be called paride. 1321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds To use the PARIDE support, you must say Y or M here and also to at 1341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds least one high-level driver (e.g. "Parallel port IDE disks", 1351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "Parallel port ATAPI CD-ROMs", "Parallel port ATAPI disks" etc.) and 1361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds to at least one protocol driver (e.g. "ATEN EH-100 protocol", 1371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "MicroSolutions backpack protocol", "DataStor Commuter protocol" 1381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds etc.). 1391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldssource "drivers/block/paride/Kconfig" 1411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig BLK_CPQ_DA 1431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tristate "Compaq SMART2 support" 1441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds depends on PCI 1451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds help 1461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds This is the driver for Compaq Smart Array controllers. Everyone 1471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds using these boards should say Y here. See the file 1481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds <file:Documentation/cpqarray.txt> for the current list of boards 1491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds supported by this driver, and for further information on the use of 1501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds this driver. 1511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig BLK_CPQ_CISS_DA 1531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tristate "Compaq Smart Array 5xxx support" 1541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds depends on PCI 1551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds help 1561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds This is the driver for Compaq Smart Array 5xxx controllers. 1571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Everyone using these boards should say Y here. 1581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds See <file:Documentation/cciss.txt> for the current list of 1591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds boards supported by this driver, and for further information 1601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds on the use of this driver. 1611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig CISS_SCSI_TAPE 1631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds bool "SCSI tape drive support for Smart Array 5xxx" 1643e29fe837a512229f4757cd93fdd7163d027d103Randy Dunlap depends on BLK_CPQ_CISS_DA && PROC_FS 1653e29fe837a512229f4757cd93fdd7163d027d103Randy Dunlap depends on SCSI=y || SCSI=BLK_CPQ_CISS_DA 1661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds help 1671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds When enabled (Y), this option allows SCSI tape drives and SCSI medium 1681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds changers (tape robots) to be accessed via a Compaq 5xxx array 1691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds controller. (See <file:Documentation/cciss.txt> for more details.) 1701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds "SCSI support" and "SCSI tape support" must also be enabled for this 1721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds option to work. 1731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds When this option is disabled (N), the SCSI portion of the driver 1751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds is not compiled. 1761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig BLK_DEV_DAC960 1781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tristate "Mylex DAC960/DAC1100 PCI RAID Controller support" 1791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds depends on PCI 1801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds help 1811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds This driver adds support for the Mylex DAC960, AcceleRAID, and 1821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds eXtremeRAID PCI RAID controllers. See the file 1831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds <file:Documentation/README.DAC960> for further information about 1841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds this driver. 1851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds To compile this driver as a module, choose M here: the 1871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds module will be called DAC960. 1881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig BLK_DEV_UMEM 1901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tristate "Micro Memory MM5415 Battery Backed RAM support (EXPERIMENTAL)" 1911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds depends on PCI && EXPERIMENTAL 1921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ---help--- 1931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Saying Y here will include support for the MM5415 family of 1941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds battery backed (Non-volatile) RAM cards. 1951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds <http://www.umem.com/> 1961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds The cards appear as block devices that can be partitioned into 1981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds as many as 15 partitions. 1991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds To compile this driver as a module, choose M here: the 2011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds module will be called umem. 2021da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds The umem driver has not yet been allocated a MAJOR number, so 204bf6ee0ae494596aaf311e8430684db85d1d2f25cAdrian Bunk one is chosen dynamically. 2051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig BLK_DEV_UBD 2071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds bool "Virtual block device" 2081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds depends on UML 2091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ---help--- 2101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds The User-Mode Linux port includes a driver called UBD which will let 2111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds you access arbitrary files on the host computer as block devices. 2121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Unless you know that you do not need such virtual block devices say 2131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Y here. 2141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig BLK_DEV_UBD_SYNC 2161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds bool "Always do synchronous disk IO for UBD" 2171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds depends on BLK_DEV_UBD 2181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ---help--- 2191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Writes to the virtual block device are not immediately written to the 2201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds host's disk; this may cause problems if, for example, the User-Mode 2211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Linux 'Virtual Machine' uses a journalling filesystem and the host 2221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds computer crashes. 2231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Synchronous operation (i.e. always writing data to the host's disk 2251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds immediately) is configurable on a per-UBD basis by using a special 2261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kernel command line option. Alternatively, you can say Y here to 2271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds turn on synchronous operation by default for all block devices. 2281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds If you're running a journalling file system (like reiserfs, for 2301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds example) in your virtual machine, you will want to say Y here. If 2311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds you care for the safety of the data in your virtual machine, Y is a 2321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds wise choice too. In all other cases (for example, if you're just 2331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds playing around with User-Mode Linux) you can choose N. 2341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig BLK_DEV_COW_COMMON 2361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds bool 2371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds default BLK_DEV_UBD 2381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig MMAPPER 2401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tristate "Example IO memory driver (BROKEN)" 2411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds depends on UML && BROKEN 2421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ---help--- 2431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds The User-Mode Linux port can provide support for IO Memory 2441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds emulation with this option. This allows a host file to be 2451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds specified as an I/O region on the kernel command line. That file 2461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds will be mapped into UML's kernel address space where a driver can 2471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds locate it and do whatever it wants with the memory, including 2481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds providing an interface to it for UML processes to use. 2491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds For more information, see 2511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds <http://user-mode-linux.sourceforge.net/iomem.html>. 2521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds If you'd like to be able to provide a simulated IO port space for 2541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds User-Mode Linux processes, say Y. If unsure, say N. 2551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig BLK_DEV_LOOP 2571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tristate "Loopback device support" 2581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ---help--- 2591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Saying Y here will allow you to use a regular file as a block 2601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds device; you can then create a file system on that block device and 2611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds mount it just as you would mount other block devices such as hard 2621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds drive partitions, CD-ROM drives or floppy drives. The loop devices 2631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds are block special device files with major number 7 and typically 2641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds called /dev/loop0, /dev/loop1 etc. 2651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds This is useful if you want to check an ISO 9660 file system before 2671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds burning the CD, or if you want to use floppy images without first 2681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds writing them to floppy. Furthermore, some Linux distributions avoid 2691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds the need for a dedicated Linux partition by keeping their complete 2701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds root file system inside a DOS FAT file using this loop device 2711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds driver. 2721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds To use the loop device, you need the losetup utility, found in the 2741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds util-linux package, see 2751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds <ftp://ftp.kernel.org/pub/linux/utils/util-linux/>. 2761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds The loop device driver can also be used to "hide" a file system in 2781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds a disk partition, floppy, or regular file, either using encryption 2791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds (scrambling the data) or steganography (hiding the data in the low 2801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds bits of, say, a sound file). This is also safe if the file resides 2811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds on a remote file server. 2821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds There are several ways of encrypting disks. Some of these require 2841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds kernel patches. The vanilla kernel offers the cryptoloop option 2851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds and a Device Mapper target (which is superior, as it supports all 2861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds file systems). If you want to use the cryptoloop, say Y to both 2871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds LOOP and CRYPTOLOOP, and make sure you have a recent (version 2.12 2881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds or later) version of util-linux. Additionally, be aware that 2891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds the cryptoloop is not safe for storing journaled filesystems. 2901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Note that this loop device has nothing to do with the loopback 2921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds device used for network connections from the machine to itself. 2931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds To compile this driver as a module, choose M here: the 2951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds module will be called loop. 2961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Most users will answer N here. 2981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2991da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig BLK_DEV_CRYPTOLOOP 3001da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tristate "Cryptoloop Support" 3011da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds select CRYPTO 3028df3b0a219967080d9dc4b604b5fecacb6967af0Herbert Xu select CRYPTO_CBC 3031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds depends on BLK_DEV_LOOP 3041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ---help--- 3051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Say Y here if you want to be able to use the ciphers that are 3061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds provided by the CryptoAPI as loop transformation. This might be 3071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds used as hard disk encryption. 3081da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds WARNING: This device is not safe for journaled file systems like 3101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ext3 or Reiserfs. Please use the Device Mapper crypto module 3111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds instead, which can be configured to be on-disk compatible with the 3121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds cryptoloop device. 3131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig BLK_DEV_NBD 3151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tristate "Network block device support" 3161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds depends on NET 3171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ---help--- 3181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Saying Y here will allow your computer to be a client for network 3191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds block devices, i.e. it will be able to use block devices exported by 3201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds servers (mount file systems on them etc.). Communication between 3211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds client and server works over TCP/IP networking, but to the client 3221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds program this is hidden: it looks like a regular local file access to 3231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds a block device special file such as /dev/nd0. 3241da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Network block devices also allows you to run a block-device in 3261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds userland (making server and client physically the same computer, 3271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds communicating using the loopback network device). 3281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Read <file:Documentation/nbd.txt> for more information, especially 3301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds about where to find the server code, which runs in user space and 3311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds does not need special kernel support. 3321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Note that this has nothing to do with the network file systems NFS 3341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds or Coda; you can say N here even if you intend to use NFS or Coda. 3351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3361da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds To compile this driver as a module, choose M here: the 3371da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds module will be called nbd. 3381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds If unsure, say N. 3401da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig BLK_DEV_SX8 3421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tristate "Promise SATA SX8 support" 3431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds depends on PCI 3441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ---help--- 3451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Saying Y or M here will enable support for the 3461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Promise SATA SX8 controllers. 3471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Use devices /dev/sx8/$N and /dev/sx8/$Np$M. 3491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig BLK_DEV_UB 3511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tristate "Low Performance USB Block driver" 3521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds depends on USB 3531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds help 3541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds This driver supports certain USB attached storage devices 3551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds such as flash keys. 3561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 357a00828e9ac62caed7b830d631914d7748817ccd1Pete Zaitcev If you enable this driver, it is recommended to avoid conflicts 358a00828e9ac62caed7b830d631914d7748817ccd1Pete Zaitcev with usb-storage by enabling USB_LIBUSUAL. 3591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds If unsure, say N. 3611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3621da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig BLK_DEV_RAM 3631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tristate "RAM disk support" 3641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds ---help--- 3651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Saying Y here will allow you to use a portion of your RAM memory as 3661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds a block device, so that you can make file systems on it, read and 3671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds write to it and do all the other things that you can do with normal 3681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds block devices (such as hard drives). It is usually used to load and 3691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds store a copy of a minimal root file system off of a floppy into RAM 3701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds during the initial install of Linux. 3711da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Note that the kernel command line option "ramdisk=XX" is now 3731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds obsolete. For details, read <file:Documentation/ramdisk.txt>. 3741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds To compile this driver as a module, choose M here: the 3761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds module will be called rd. 3771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Most normal users won't need the RAM disk functionality, and can 3791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds thus say N here. 3801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig BLK_DEV_RAM_COUNT 382a687fb18cbd061de2092632cf77e6b9dc93cf7cdAdrian Bunk int "Default number of RAM disks" 3831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds default "16" 384a687fb18cbd061de2092632cf77e6b9dc93cf7cdAdrian Bunk depends on BLK_DEV_RAM 3851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds help 3861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds The default value is 16 RAM disks. Change this if you know what 3871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds are doing. If you boot from a filesystem that needs to be extracted 3881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds in memory, you will need at least one RAM disk (e.g. root on cramfs). 3891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig BLK_DEV_RAM_SIZE 3911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int "Default RAM disk size (kbytes)" 3921da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds depends on BLK_DEV_RAM 3931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds default "4096" 3941da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds help 3951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds The default value is 4096 kilobytes. Only change this if you know 3961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds what are you doing. If you are using IBM S/390, then set this to 3971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 8192. 3981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 399bef317e364f065717819fbbe7965d4401820286cNathan Scottconfig BLK_DEV_RAM_BLOCKSIZE 400bef317e364f065717819fbbe7965d4401820286cNathan Scott int "Default RAM disk block size (bytes)" 401bef317e364f065717819fbbe7965d4401820286cNathan Scott depends on BLK_DEV_RAM 402bef317e364f065717819fbbe7965d4401820286cNathan Scott default "1024" 403bef317e364f065717819fbbe7965d4401820286cNathan Scott help 40473cf9630683e8b9f58485b75a13a21ac9ff33aefChristian Borntraeger The default value is 1024 bytes. PAGE_SIZE is a much more 405bef317e364f065717819fbbe7965d4401820286cNathan Scott efficient choice however. The default is kept to ensure initrd 406bef317e364f065717819fbbe7965d4401820286cNathan Scott setups function - apparently needed by the rd_load_image routine 407bef317e364f065717819fbbe7965d4401820286cNathan Scott that supposes the filesystem in the image uses a 1024 blocksize. 408bef317e364f065717819fbbe7965d4401820286cNathan Scott 4091da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig CDROM_PKTCDVD 4101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tristate "Packet writing on CD/DVD media" 4111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds depends on !UML 4121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds help 4132d4eeec563a0472b68de3597c17f2d3b11c49c00Thomas Maier If you have a CDROM/DVD drive that supports packet writing, say 4142d4eeec563a0472b68de3597c17f2d3b11c49c00Thomas Maier Y to include support. It should work with any MMC/Mt Fuji 4152d4eeec563a0472b68de3597c17f2d3b11c49c00Thomas Maier compliant ATAPI or SCSI drive, which is just about any newer 4162d4eeec563a0472b68de3597c17f2d3b11c49c00Thomas Maier DVD/CD writer. 4171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4182d4eeec563a0472b68de3597c17f2d3b11c49c00Thomas Maier Currently only writing to CD-RW, DVD-RW, DVD+RW and DVDRAM discs 4192d4eeec563a0472b68de3597c17f2d3b11c49c00Thomas Maier is possible. 4201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds DVD-RW disks must be in restricted overwrite mode. 4211da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4222d4eeec563a0472b68de3597c17f2d3b11c49c00Thomas Maier See the file <file:Documentation/cdrom/packet-writing.txt> 4232d4eeec563a0472b68de3597c17f2d3b11c49c00Thomas Maier for further information on the use of this driver. 4242d4eeec563a0472b68de3597c17f2d3b11c49c00Thomas Maier 4251da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds To compile this driver as a module, choose M here: the 4261da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds module will be called pktcdvd. 4271da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig CDROM_PKTCDVD_BUFFERS 4291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds int "Free buffers for data gathering" 4301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds depends on CDROM_PKTCDVD 4311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds default "8" 4321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds help 4331da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds This controls the maximum number of active concurrent packets. More 4341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds concurrent packets can increase write performance, but also require 4351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds more memory. Each concurrent packet will require approximately 64Kb 436e1bc89bc9991e994f2b3c60d9ad2fdb5ad9b10fcPeter Osterlund of non-swappable kernel memory, memory which will be allocated when 437e1bc89bc9991e994f2b3c60d9ad2fdb5ad9b10fcPeter Osterlund a disc is opened for writing. 4381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig CDROM_PKTCDVD_WCACHE 440b566ccefd7814e4fa403de81aea299bdc11ceed5Adrian Bunk bool "Enable write caching (EXPERIMENTAL)" 441b566ccefd7814e4fa403de81aea299bdc11ceed5Adrian Bunk depends on CDROM_PKTCDVD && EXPERIMENTAL 4421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds help 4431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds If enabled, write caching will be set for the CD-R/W device. For now 4441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds this option is dangerous unless the CD-RW media is known good, as we 4451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds don't do deferred write error handling yet. 4461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconfig ATA_OVER_ETH 4481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds tristate "ATA over Ethernet support" 4491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds depends on NET 4501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds help 4511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds This driver provides Support for ATA over Ethernet block 4521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds devices like the Coraid EtherDrive (R) Storage Blade. 4531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 45461d48c2c31799ab9dbddbbcfccfd8042a5c6b75aMartin Schwidefskysource "drivers/s390/block/Kconfig" 45561d48c2c31799ab9dbddbbcfccfd8042a5c6b75aMartin Schwidefsky 4561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsendmenu 4579361401eb7619c033e2394e4f9f6d410d6719ac7David Howells 4589361401eb7619c033e2394e4f9f6d410d6719ac7David Howellsendif 459