linux/drivers/ide/Kconfig
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   1#
   2# IDE ATA ATAPI Block device driver configuration
   3#
   4# Andre Hedrick <andre@linux-ide.org>
   5#
   6
   7menuconfig IDE
   8        tristate "ATA/ATAPI/MFM/RLL support"
   9        depends on BLOCK
  10        depends on HAS_IOMEM
  11        ---help---
  12          If you say Y here, your kernel will be able to manage low cost mass
  13          storage units such as ATA/(E)IDE and ATAPI units. The most common
  14          cases are IDE hard drives and ATAPI CD-ROM drives.
  15
  16          If your system is pure SCSI and doesn't use these interfaces, you
  17          can say N here.
  18
  19          Integrated Disk Electronics (IDE aka ATA-1) is a connecting standard
  20          for mass storage units such as hard disks. It was designed by
  21          Western Digital and Compaq Computer in 1984. It was then named
  22          ST506. Quite a number of disks use the IDE interface.
  23
  24          AT Attachment (ATA) is the superset of the IDE specifications.
  25          ST506 was also called ATA-1.
  26
  27          Fast-IDE is ATA-2 (also named Fast ATA), Enhanced IDE (EIDE) is
  28          ATA-3. It provides support for larger disks (up to 8.4GB by means of
  29          the LBA standard), more disks (4 instead of 2) and for other mass
  30          storage units such as tapes and cdrom. UDMA/33 (aka UltraDMA/33) is
  31          ATA-4 and provides faster (and more CPU friendly) transfer modes
  32          than previous PIO (Programmed processor Input/Output) from previous
  33          ATA/IDE standards by means of fast DMA controllers.
  34
  35          ATA Packet Interface (ATAPI) is a protocol used by EIDE tape and
  36          CD-ROM drives, similar in many respects to the SCSI protocol.
  37
  38          SMART IDE (Self Monitoring, Analysis and Reporting Technology) was
  39          designed in order to prevent data corruption and disk crash by
  40          detecting pre hardware failure conditions (heat, access time, and
  41          the like...). Disks built since June 1995 may follow this standard.
  42          The kernel itself doesn't manage this; however there are quite a
  43          number of user programs such as smart that can query the status of
  44          SMART parameters from disk drives.
  45
  46          To compile this driver as a module, choose M here: the
  47          module will be called ide.
  48
  49          For further information, please read <file:Documentation/ide.txt>.
  50
  51          If unsure, say Y.
  52
  53if IDE
  54
  55config IDE_MAX_HWIFS
  56        int "Max IDE interfaces"
  57        depends on ALPHA || SUPERH || IA64 || EMBEDDED
  58        range 1 10
  59        default 4
  60        help
  61          This is the maximum number of IDE hardware interfaces that will
  62          be supported by the driver. Make sure it is at least as high as
  63          the number of IDE interfaces in your system.
  64
  65config BLK_DEV_IDE
  66        tristate "Enhanced IDE/MFM/RLL disk/cdrom/tape/floppy support"
  67        ---help---
  68          If you say Y here, you will use the full-featured IDE driver to
  69          control up to ten ATA/IDE interfaces, each being able to serve a
  70          "master" and a "slave" device, for a total of up to twenty ATA/IDE
  71          disk/cdrom/tape/floppy drives.
  72
  73          Useful information about large (>540 MB) IDE disks, multiple
  74          interfaces, what to do if ATA/IDE devices are not automatically
  75          detected, sound card ATA/IDE ports, module support, and other
  76          topics, is contained in <file:Documentation/ide.txt>. For detailed
  77          information about hard drives, consult the Disk-HOWTO and the
  78          Multi-Disk-HOWTO, available from
  79          <http://www.tldp.org/docs.html#howto>.
  80
  81          To fine-tune ATA/IDE drive/interface parameters for improved
  82          performance, look for the hdparm package at
  83          <ftp://ibiblio.org/pub/Linux/system/hardware/>.
  84
  85          To compile this driver as a module, choose M here and read
  86          <file:Documentation/ide.txt>. The module will be called ide-mod.
  87          Do not compile this driver as a module if your root file system (the
  88          one containing the directory /) is located on an IDE device.
  89
  90          If you have one or more IDE drives, say Y or M here. If your system
  91          has no IDE drives, or if memory requirements are really tight, you
  92          could say N here, and select the "Old hard disk driver" below
  93          instead to save about 13 KB of memory in the kernel.
  94
  95if BLK_DEV_IDE
  96
  97comment "Please see Documentation/ide.txt for help/info on IDE drives"
  98
  99config BLK_DEV_IDE_SATA
 100        bool "Support for SATA (deprecated; conflicts with libata SATA driver)"
 101        default n
 102        ---help---
 103          There are two drivers for Serial ATA controllers.
 104
 105          The main driver, "libata", uses the SCSI subsystem
 106          and supports most modern SATA controllers. In order to use it
 107          you may take a look at "Serial ATA (prod) and Parallel ATA
 108          (experimental) drivers".
 109
 110          The IDE driver (which you are currently configuring) supports
 111          a few first-generation SATA controllers.
 112
 113          In order to eliminate conflicts between the two subsystems,
 114          this config option enables the IDE driver's SATA support.
 115          Normally this is disabled, as it is preferred that libata
 116          supports SATA controllers, and this (IDE) driver supports
 117          PATA controllers.
 118
 119          If unsure, say N.
 120
 121config BLK_DEV_HD_IDE
 122        bool "Use old disk-only driver on primary interface"
 123        depends on (X86 || SH_MPC1211)
 124        ---help---
 125          There are two drivers for MFM/RLL/IDE disks.  Most people use just
 126          the new enhanced driver by itself.  This option however installs the
 127          old hard disk driver to control the primary IDE/disk interface in
 128          the system, leaving the new enhanced IDE driver to take care of only
 129          the 2nd/3rd/4th IDE interfaces.  Doing this will prevent you from
 130          having an IDE/ATAPI CD-ROM or tape drive connected to the primary
 131          IDE interface.  Choosing this option may be useful for older systems
 132          which have MFM/RLL/ESDI controller+drives at the primary port
 133          address (0x1f0), along with IDE drives at the secondary/3rd/4th port
 134          addresses.
 135
 136          Normally, just say N here; you will then use the new driver for all
 137          4 interfaces.
 138
 139config BLK_DEV_IDEDISK
 140        tristate "Include IDE/ATA-2 DISK support"
 141        ---help---
 142          This will include enhanced support for MFM/RLL/IDE hard disks.  If
 143          you have a MFM/RLL/IDE disk, and there is no special reason to use
 144          the old hard disk driver instead, say Y.  If you have an SCSI-only
 145          system, you can say N here.
 146
 147          To compile this driver as a module, choose M here: the
 148          module will be called ide-disk.
 149          Do not compile this driver as a module if your root file system
 150          (the one containing the directory /) is located on the IDE disk.
 151
 152          If unsure, say Y.
 153
 154config IDEDISK_MULTI_MODE
 155        bool "Use multiple sector mode for Programmed Input/Output by default"
 156        help
 157          This setting is irrelevant for most IDE disks, with direct memory
 158          access, to which multiple sector mode does not apply. Multiple sector
 159          mode is a feature of most modern IDE hard drives, permitting the
 160          transfer of multiple sectors per Programmed Input/Output interrupt,
 161          rather than the usual one sector per interrupt. When this feature is
 162          enabled, it can reduce operating system overhead for disk Programmed
 163          Input/Output. On some systems, it also can increase the data
 164          throughput of Programmed Input/Output. Some drives, however, seemed
 165          to run slower with multiple sector mode enabled. Some drives claimed
 166          to support multiple sector mode, but lost data at some settings.
 167          Under rare circumstances, such failures could result in massive
 168          filesystem corruption.
 169
 170          If you get the following error, try to say Y here:
 171
 172          hda: set_multmode: status=0x51 { DriveReady SeekComplete Error }
 173          hda: set_multmode: error=0x04 { DriveStatusError }
 174
 175          If in doubt, say N.
 176
 177config BLK_DEV_IDECS
 178        tristate "PCMCIA IDE support"
 179        depends on PCMCIA
 180        help
 181          Support for Compact Flash cards, outboard IDE disks, tape drives,
 182          and CD-ROM drives connected through a PCMCIA card.
 183
 184config BLK_DEV_DELKIN
 185        tristate "Cardbus IDE support (Delkin/ASKA/Workbit)"
 186        depends on CARDBUS && PCI
 187        help
 188          Support for Delkin, ASKA, and Workbit Cardbus CompactFlash
 189          Adapters.  This may also work for similar SD and XD adapters.
 190
 191config BLK_DEV_IDECD
 192        tristate "Include IDE/ATAPI CDROM support"
 193        ---help---
 194          If you have a CD-ROM drive using the ATAPI protocol, say Y. ATAPI is
 195          a newer protocol used by IDE CD-ROM and TAPE drives, similar to the
 196          SCSI protocol. Most new CD-ROM drives use ATAPI, including the
 197          NEC-260, Mitsumi FX400, Sony 55E, and just about all non-SCSI
 198          double(2X) or better speed drives.
 199
 200          If you say Y here, the CD-ROM drive will be identified at boot time
 201          along with other IDE devices, as "hdb" or "hdc", or something
 202          similar (check the boot messages with dmesg). If this is your only
 203          CD-ROM drive, you can say N to all other CD-ROM options, but be sure
 204          to say Y or M to "ISO 9660 CD-ROM file system support".
 205
 206          To compile this driver as a module, choose M here: the
 207          module will be called ide-cd.
 208
 209config BLK_DEV_IDETAPE
 210        tristate "Include IDE/ATAPI TAPE support (EXPERIMENTAL)"
 211        depends on EXPERIMENTAL
 212        help
 213          If you have an IDE tape drive using the ATAPI protocol, say Y.
 214          ATAPI is a newer protocol used by IDE tape and CD-ROM drives,
 215          similar to the SCSI protocol.  If you have an SCSI tape drive
 216          however, you can say N here.
 217
 218          You should also say Y if you have an OnStream DI-30 tape drive; this
 219          will not work with the SCSI protocol, until there is support for the
 220          SC-30 and SC-50 versions.
 221
 222          If you say Y here, the tape drive will be identified at boot time
 223          along with other IDE devices, as "hdb" or "hdc", or something
 224          similar, and will be mapped to a character device such as "ht0"
 225          (check the boot messages with dmesg).  Be sure to consult the
 226          <file:drivers/ide/ide-tape.c> and <file:Documentation/ide.txt> files
 227          for usage information.
 228
 229          To compile this driver as a module, choose M here: the
 230          module will be called ide-tape.
 231
 232config BLK_DEV_IDEFLOPPY
 233        tristate "Include IDE/ATAPI FLOPPY support"
 234        ---help---
 235          If you have an IDE floppy drive which uses the ATAPI protocol,
 236          answer Y.  ATAPI is a newer protocol used by IDE CD-ROM/tape/floppy
 237          drives, similar to the SCSI protocol.
 238
 239          The LS-120 and the IDE/ATAPI Iomega ZIP drive are also supported by
 240          this driver. For information about jumper settings and the question
 241          of when a ZIP drive uses a partition table, see
 242          <http://www.win.tue.nl/~aeb/linux/zip/zip-1.html>.
 243          (ATAPI PD-CD/CDR drives are not supported by this driver; support
 244          for PD-CD/CDR drives is available if you answer Y to
 245          "SCSI emulation support", below).
 246
 247          If you say Y here, the FLOPPY drive will be identified along with
 248          other IDE devices, as "hdb" or "hdc", or something similar (check
 249          the boot messages with dmesg).
 250
 251          To compile this driver as a module, choose M here: the
 252          module will be called ide-floppy.
 253
 254config BLK_DEV_IDESCSI
 255        tristate "SCSI emulation support"
 256        depends on SCSI
 257        ---help---
 258          WARNING: ide-scsi is no longer needed for cd writing applications!
 259          The 2.6 kernel supports direct writing to ide-cd, which eliminates
 260          the need for ide-scsi + the entire scsi stack just for writing a
 261          cd. The new method is more efficient in every way.
 262
 263          This will provide SCSI host adapter emulation for IDE ATAPI devices,
 264          and will allow you to use a SCSI device driver instead of a native
 265          ATAPI driver.
 266
 267          This is useful if you have an ATAPI device for which no native
 268          driver has been written (for example, an ATAPI PD-CD drive);
 269          you can then use this emulation together with an appropriate SCSI
 270          device driver. In order to do this, say Y here and to "SCSI support"
 271          and "SCSI generic support", below. You must then provide the kernel
 272          command line "hdx=ide-scsi" (try "man bootparam" or see the
 273          documentation of your boot loader (lilo or loadlin) about how to
 274          pass options to the kernel at boot time) for devices if you want the
 275          native EIDE sub-drivers to skip over the native support, so that
 276          this SCSI emulation can be used instead.
 277
 278          Note that this option does NOT allow you to attach SCSI devices to a
 279          box that doesn't have a SCSI host adapter installed.
 280
 281          If both this SCSI emulation and native ATAPI support are compiled
 282          into the kernel, the native support will be used.
 283
 284config BLK_DEV_IDEACPI
 285        bool "IDE ACPI support"
 286        depends on ACPI
 287        ---help---
 288          Implement ACPI support for generic IDE devices. On modern
 289          machines ACPI support is required to properly handle ACPI S3 states.
 290
 291config IDE_TASK_IOCTL
 292        bool "IDE Taskfile Access"
 293        help
 294          This is a direct raw access to the media.  It is a complex but
 295          elegant solution to test and validate the domain of the hardware and
 296          perform below the driver data recovery if needed.  This is the most
 297          basic form of media-forensics.
 298
 299          If you are unsure, say N here.
 300
 301config IDE_PROC_FS
 302        bool "legacy /proc/ide/ support"
 303        depends on IDE && PROC_FS
 304        default y
 305        help
 306          This option enables support for the various files in
 307          /proc/ide.  In Linux 2.6 this has been superseded by
 308          files in sysfs but many legacy applications rely on this.
 309
 310          If unsure say Y.
 311
 312comment "IDE chipset support/bugfixes"
 313
 314config IDE_GENERIC
 315        tristate "generic/default IDE chipset support"
 316        help
 317          If unsure, say N.
 318
 319config BLK_DEV_PLATFORM
 320        tristate "Platform driver for IDE interfaces"
 321        help
 322          This is the platform IDE driver, used mostly for Memory Mapped
 323          IDE devices, like Compact Flashes running in True IDE mode.
 324
 325          If unsure, say N.
 326
 327config BLK_DEV_CMD640
 328        bool "CMD640 chipset bugfix/support"
 329        depends on X86
 330        ---help---
 331          The CMD-Technologies CMD640 IDE chip is used on many common 486 and
 332          Pentium motherboards, usually in combination with a "Neptune" or
 333          "SiS" chipset. Unfortunately, it has a number of rather nasty
 334          design flaws that can cause severe data corruption under many common
 335          conditions. Say Y here to include code which tries to automatically
 336          detect and correct the problems under Linux. This option also
 337          enables access to the secondary IDE ports in some CMD640 based
 338          systems.
 339
 340          This driver will work automatically in PCI based systems (most new
 341          systems have PCI slots). But if your system uses VESA local bus
 342          (VLB) instead of PCI, you must also supply a kernel boot parameter
 343          to enable the CMD640 bugfix/support: "ide0=cmd640_vlb". (Try "man
 344          bootparam" or see the documentation of your boot loader about how to
 345          pass options to the kernel.)
 346
 347          The CMD640 chip is also used on add-in cards by Acculogic, and on
 348          the "CSA-6400E PCI to IDE controller" that some people have. For
 349          details, read <file:Documentation/ide.txt>.
 350
 351config BLK_DEV_CMD640_ENHANCED
 352        bool "CMD640 enhanced support"
 353        depends on BLK_DEV_CMD640
 354        help
 355          This option includes support for setting/autotuning PIO modes and
 356          prefetch on CMD640 IDE interfaces.  For details, read
 357          <file:Documentation/ide.txt>. If you have a CMD640 IDE interface
 358          and your BIOS does not already do this for you, then say Y here.
 359          Otherwise say N.
 360
 361config BLK_DEV_IDEPNP
 362        bool "PNP EIDE support"
 363        depends on PNP
 364        select IDE_GENERIC
 365        help
 366          If you have a PnP (Plug and Play) compatible EIDE card and
 367          would like the kernel to automatically detect and activate
 368          it, say Y here.
 369
 370if PCI
 371
 372comment "PCI IDE chipsets support"
 373
 374config BLK_DEV_IDEPCI
 375        bool
 376
 377config IDEPCI_SHARE_IRQ
 378        bool "Sharing PCI IDE interrupts support"
 379        depends on BLK_DEV_IDEPCI
 380        help
 381          Some ATA/IDE chipsets have hardware support which allows for
 382          sharing a single IRQ with other cards. To enable support for
 383          this in the ATA/IDE driver, say Y here.
 384
 385          It is safe to say Y to this question, in most cases.
 386          If unsure, say N.
 387
 388config IDEPCI_PCIBUS_ORDER
 389        def_bool BLK_DEV_IDE=y && BLK_DEV_IDEPCI
 390
 391# TODO: split it on per host driver config options (or module parameters)
 392config BLK_DEV_OFFBOARD
 393        bool "Boot off-board chipsets first support (DEPRECATED)"
 394        depends on BLK_DEV_IDEPCI && (BLK_DEV_AEC62XX || BLK_DEV_GENERIC || BLK_DEV_HPT34X || BLK_DEV_HPT366 || BLK_DEV_PDC202XX_NEW || BLK_DEV_PDC202XX_OLD || BLK_DEV_TC86C001)
 395        help
 396          Normally, IDE controllers built into the motherboard (on-board
 397          controllers) are assigned to ide0 and ide1 while those on add-in PCI
 398          cards (off-board controllers) are relegated to ide2 and ide3.
 399          Answering Y here will allow you to reverse the situation, with
 400          off-board controllers on ide0/1 and on-board controllers on ide2/3.
 401          This can improve the usability of some boot managers such as lilo
 402          when booting from a drive on an off-board controller.
 403
 404          If you say Y here, and you actually want to reverse the device scan
 405          order as explained above, you also need to issue the kernel command
 406          line option "ide=reverse". (Try "man bootparam" or see the
 407          documentation of your boot loader (lilo or loadlin) about how to
 408          pass options to the kernel at boot time.)
 409
 410          Note that, if you do this, the order of the hd* devices will be
 411          rearranged which may require modification of fstab and other files.
 412
 413          Please also note that this method of assuring stable naming of
 414          IDE devices is unreliable and use other means for achieving it
 415          (i.e. udev).
 416
 417          If in doubt, say N.
 418
 419config BLK_DEV_GENERIC
 420        tristate "Generic PCI IDE Chipset Support"
 421        select BLK_DEV_IDEPCI
 422        help
 423          This option provides generic support for various PCI IDE Chipsets
 424          which otherwise might not be supported.
 425
 426config BLK_DEV_OPTI621
 427        tristate "OPTi 82C621 chipset enhanced support (EXPERIMENTAL)"
 428        depends on EXPERIMENTAL
 429        select BLK_DEV_IDEPCI
 430        help
 431          This is a driver for the OPTi 82C621 EIDE controller.
 432          Please read the comments at the top of <file:drivers/ide/pci/opti621.c>.
 433
 434config BLK_DEV_RZ1000
 435        tristate "RZ1000 chipset bugfix/support"
 436        depends on X86
 437        select BLK_DEV_IDEPCI
 438        help
 439          The PC-Technologies RZ1000 IDE chip is used on many common 486 and
 440          Pentium motherboards, usually along with the "Neptune" chipset.
 441          Unfortunately, it has a rather nasty design flaw that can cause
 442          severe data corruption under many conditions. Say Y here to include
 443          code which automatically detects and corrects the problem under
 444          Linux. This may slow disk throughput by a few percent, but at least
 445          things will operate 100% reliably.
 446
 447config BLK_DEV_IDEDMA_PCI
 448        bool
 449        select BLK_DEV_IDEPCI
 450
 451config BLK_DEV_AEC62XX
 452        tristate "AEC62XX chipset support"
 453        select BLK_DEV_IDEDMA_PCI
 454        help
 455          This driver adds explicit support for Acard AEC62xx (Artop ATP8xx)
 456          IDE controllers. This allows the kernel to change PIO, DMA and UDMA
 457          speeds and to configure the chip to optimum performance.
 458
 459config BLK_DEV_ALI15X3
 460        tristate "ALI M15x3 chipset support"
 461        select BLK_DEV_IDEDMA_PCI
 462        help
 463          This driver ensures (U)DMA support for ALI 1533, 1543 and 1543C
 464          onboard chipsets.  It also tests for Simplex mode and enables
 465          normal dual channel support.
 466
 467          If you say Y here, you also need to say Y to "Use DMA by default
 468          when available", above.  Please read the comments at the top of
 469          <file:drivers/ide/pci/alim15x3.c>.
 470
 471          If unsure, say N.
 472
 473config WDC_ALI15X3
 474        bool "ALI M15x3 WDC support (DANGEROUS)"
 475        depends on BLK_DEV_ALI15X3
 476        ---help---
 477          This allows for UltraDMA support for WDC drives that ignore CRC
 478          checking. You are a fool for enabling this option, but there have
 479          been requests. DO NOT COMPLAIN IF YOUR DRIVE HAS FS CORRUPTION, IF
 480          YOU ENABLE THIS! No one will listen, just laugh for ignoring this
 481          SERIOUS WARNING.
 482
 483          Using this option can allow WDC drives to run at ATA-4/5 transfer
 484          rates with only an ATA-2 support structure.
 485
 486          SAY N!
 487
 488config BLK_DEV_AMD74XX
 489        tristate "AMD and nVidia IDE support"
 490        depends on !ARM
 491        select BLK_DEV_IDEDMA_PCI
 492        help
 493          This driver adds explicit support for AMD-7xx and AMD-8111 chips
 494          and also for the nVidia nForce chip.  This allows the kernel to
 495          change PIO, DMA and UDMA speeds and to configure the chip to
 496          optimum performance.
 497
 498config BLK_DEV_ATIIXP
 499        tristate "ATI IXP chipset IDE support"
 500        depends on X86
 501        select BLK_DEV_IDEDMA_PCI
 502        help
 503          This driver adds explicit support for ATI IXP chipset.
 504          This allows the kernel to change PIO, DMA and UDMA speeds
 505          and to configure the chip to optimum performance.
 506
 507          Say Y here if you have an ATI IXP chipset IDE controller.
 508
 509config BLK_DEV_CMD64X
 510        tristate "CMD64{3|6|8|9} chipset support"
 511        select BLK_DEV_IDEDMA_PCI
 512        help
 513          Say Y here if you have an IDE controller which uses any of these
 514          chipsets: CMD643, CMD646, or CMD648.
 515
 516config BLK_DEV_TRIFLEX
 517        tristate "Compaq Triflex IDE support"
 518        select BLK_DEV_IDEDMA_PCI
 519        help
 520          Say Y here if you have a Compaq Triflex IDE controller, such
 521          as those commonly found on Compaq Pentium-Pro systems
 522
 523config BLK_DEV_CY82C693
 524        tristate "CY82C693 chipset support"
 525        select BLK_DEV_IDEDMA_PCI
 526        help
 527          This driver adds detection and support for the CY82C693 chipset
 528          used on Digital's PC-Alpha 164SX boards.
 529
 530          If you say Y here, you need to say Y to "Use DMA by default
 531          when available" as well.
 532
 533config BLK_DEV_CS5520
 534        tristate "Cyrix CS5510/20 MediaGX chipset support (VERY EXPERIMENTAL)"
 535        depends on EXPERIMENTAL
 536        select BLK_DEV_IDEDMA_PCI
 537        help
 538          Include support for PIO tuning and virtual DMA on the Cyrix MediaGX
 539          5510/5520 chipset. This will automatically be detected and
 540          configured if found.
 541
 542          It is safe to say Y to this question.
 543
 544config BLK_DEV_CS5530
 545        tristate "Cyrix/National Semiconductor CS5530 MediaGX chipset support"
 546        select BLK_DEV_IDEDMA_PCI
 547        help
 548          Include support for UDMA on the Cyrix MediaGX 5530 chipset. This
 549          will automatically be detected and configured if found.
 550
 551          It is safe to say Y to this question.
 552
 553config BLK_DEV_CS5535
 554        tristate "AMD CS5535 chipset support"
 555        depends on X86 && !X86_64
 556        select BLK_DEV_IDEDMA_PCI
 557        help
 558          Include support for UDMA on the NSC/AMD CS5535 companion chipset.
 559          This will automatically be detected and configured if found.
 560
 561          It is safe to say Y to this question.
 562
 563config BLK_DEV_HPT34X
 564        tristate "HPT34X chipset support"
 565        select BLK_DEV_IDEDMA_PCI
 566        help
 567          This driver adds up to 4 more EIDE devices sharing a single
 568          interrupt. The HPT343 chipset in its current form is a non-bootable
 569          controller; the HPT345/HPT363 chipset is a bootable (needs BIOS FIX)
 570          PCI UDMA controllers. This driver requires dynamic tuning of the
 571          chipset during the ide-probe at boot time. It is reported to support
 572          DVD II drives, by the manufacturer.
 573
 574config HPT34X_AUTODMA
 575        bool "HPT34X AUTODMA support (EXPERIMENTAL)"
 576        depends on BLK_DEV_HPT34X && EXPERIMENTAL
 577        help
 578          This is a dangerous thing to attempt currently! Please read the
 579          comments at the top of <file:drivers/ide/pci/hpt34x.c>.  If you say Y
 580          here, then say Y to "Use DMA by default when available" as well.
 581
 582          If unsure, say N.
 583
 584config BLK_DEV_HPT366
 585        tristate "HPT36X/37X chipset support"
 586        select BLK_DEV_IDEDMA_PCI
 587        help
 588          HPT366 is an Ultra DMA chipset for ATA-66.
 589          HPT368 is an Ultra DMA chipset for ATA-66 RAID Based.
 590          HPT370 is an Ultra DMA chipset for ATA-100.
 591          HPT372 is an Ultra DMA chipset for ATA-100.
 592          HPT374 is an Ultra DMA chipset for ATA-100.
 593
 594          This driver adds up to 4 more EIDE devices sharing a single
 595          interrupt.
 596
 597          The HPT366 chipset in its current form is bootable. One solution
 598          for this problem are special LILO commands for redirecting the
 599          reference to device 0x80. The other solution is to say Y to "Boot
 600          off-board chipsets first support" (CONFIG_BLK_DEV_OFFBOARD) unless
 601          your mother board has the chipset natively mounted. Regardless one
 602          should use the fore mentioned option and call at LILO or include
 603          "ide=reverse" in LILO's append-line.
 604
 605          This driver requires dynamic tuning of the chipset during the
 606          ide-probe at boot. It is reported to support DVD II drives, by the
 607          manufacturer.
 608
 609config BLK_DEV_JMICRON
 610        tristate "JMicron JMB36x support"
 611        select BLK_DEV_IDEDMA_PCI
 612        help
 613          Basic support for the JMicron ATA controllers. For full support
 614          use the libata drivers.
 615
 616config BLK_DEV_SC1200
 617        tristate "National SCx200 chipset support"
 618        select BLK_DEV_IDEDMA_PCI
 619        help
 620          This driver adds support for the built in IDE on the National
 621          SCx200 series of embedded x86 "Geode" systems
 622
 623config BLK_DEV_PIIX
 624        tristate "Intel PIIXn chipsets support"
 625        select BLK_DEV_IDEDMA_PCI
 626        help
 627          This driver adds explicit support for Intel PIIX and ICH chips
 628          and also for the Efar Victory66 (slc90e66) chip.  This allows
 629          the kernel to change PIO, DMA and UDMA speeds and to configure
 630          the chip to optimum performance.
 631
 632config BLK_DEV_IT8213
 633        tristate "IT8213 IDE support"
 634        select BLK_DEV_IDEDMA_PCI
 635        help
 636         This driver adds support for the ITE 8213 IDE controller.
 637
 638config BLK_DEV_IT821X
 639        tristate "IT821X IDE support"
 640        select BLK_DEV_IDEDMA_PCI
 641        help
 642          This driver adds support for the ITE 8211 IDE controller and the
 643          IT 8212 IDE RAID controller in both RAID and pass-through mode.
 644
 645config BLK_DEV_NS87415
 646        tristate "NS87415 chipset support"
 647        select BLK_DEV_IDEDMA_PCI
 648        help
 649          This driver adds detection and support for the NS87415 chip
 650          (used mainly on SPARC64 and PA-RISC machines).
 651
 652          Please read the comments at the top of <file:drivers/ide/pci/ns87415.c>.
 653
 654config BLK_DEV_PDC202XX_OLD
 655        tristate "PROMISE PDC202{46|62|65|67} support"
 656        select BLK_DEV_IDEDMA_PCI
 657        help
 658          Promise Ultra33 or PDC20246
 659          Promise Ultra66 or PDC20262
 660          Promise Ultra100 or PDC20265/PDC20267/PDC20268
 661
 662          This driver adds up to 4 more EIDE devices sharing a single
 663          interrupt. This add-on card is a bootable PCI UDMA controller. Since
 664          multiple cards can be installed and there are BIOS ROM problems that
 665          happen if the BIOS revisions of all installed cards (three-max) do
 666          not match, the driver attempts to do dynamic tuning of the chipset
 667          at boot-time for max-speed.  Ultra33 BIOS 1.25 or newer is required
 668          for more than one card. This card may require that you say Y to
 669          "Special UDMA Feature".
 670
 671          If you say Y here, you need to say Y to "Use DMA by default when
 672          available" as well.
 673
 674          Please read the comments at the top of
 675          <file:drivers/ide/pci/pdc202xx_old.c>.
 676
 677          If unsure, say N.
 678
 679config PDC202XX_BURST
 680        bool "Special UDMA Feature"
 681        depends on BLK_DEV_PDC202XX_OLD
 682        help
 683          This option causes the pdc202xx driver to enable UDMA modes on the
 684          PDC202xx even when the PDC202xx BIOS has not done so.
 685
 686          It was originally designed for the PDC20246/Ultra33, whose BIOS will
 687          only setup UDMA on the first two PDC20246 cards.  It has also been
 688          used successfully on a PDC20265/Ultra100, allowing use of UDMA modes
 689          when the PDC20265 BIOS has been disabled (for faster boot up).
 690
 691          Please read the comments at the top of
 692          <file:drivers/ide/pci/pdc202xx_old.c>.
 693
 694          If unsure, say N.
 695
 696config BLK_DEV_PDC202XX_NEW
 697        tristate "PROMISE PDC202{68|69|70|71|75|76|77} support"
 698        select BLK_DEV_IDEDMA_PCI
 699
 700config BLK_DEV_SVWKS
 701        tristate "ServerWorks OSB4/CSB5/CSB6 chipsets support"
 702        select BLK_DEV_IDEDMA_PCI
 703        help
 704          This driver adds PIO/(U)DMA support for the ServerWorks OSB4/CSB5
 705          chipsets.
 706
 707config BLK_DEV_SGIIOC4
 708        tristate "Silicon Graphics IOC4 chipset ATA/ATAPI support"
 709        depends on (IA64_SGI_SN2 || IA64_GENERIC) && SGI_IOC4
 710        select IDEPCI_SHARE_IRQ
 711        select BLK_DEV_IDEDMA_PCI
 712        help
 713          This driver adds PIO & MultiMode DMA-2 support for the SGI IOC4
 714          chipset, which has one channel and can support two devices.
 715          Please say Y here if you have an Altix System from SGI.
 716
 717config BLK_DEV_SIIMAGE
 718        tristate "Silicon Image chipset support"
 719        select BLK_DEV_IDEDMA_PCI
 720        help
 721          This driver adds PIO/(U)DMA support for the SI CMD680 and SII
 722          3112 (Serial ATA) chips.
 723
 724config BLK_DEV_SIS5513
 725        tristate "SiS5513 chipset support"
 726        depends on X86
 727        select BLK_DEV_IDEDMA_PCI
 728        help
 729          This driver ensures (U)DMA support for SIS5513 chipset family based
 730          mainboards.
 731
 732          The following chipsets are supported:
 733          ATA16:  SiS5511, SiS5513
 734          ATA33:  SiS5591, SiS5597, SiS5598, SiS5600
 735          ATA66:  SiS530, SiS540, SiS620, SiS630, SiS640
 736          ATA100: SiS635, SiS645, SiS650, SiS730, SiS735, SiS740,
 737          SiS745, SiS750
 738
 739          If you say Y here, you need to say Y to "Use DMA by default when
 740          available" as well.
 741
 742          Please read the comments at the top of <file:drivers/ide/pci/sis5513.c>.
 743
 744config BLK_DEV_SL82C105
 745        tristate "Winbond SL82c105 support"
 746        depends on (PPC || ARM)
 747        select BLK_DEV_IDEDMA_PCI
 748        help
 749          If you have a Winbond SL82c105 IDE controller, say Y here to enable
 750          special configuration for this chip. This is common on various CHRP
 751          motherboards, but could be used elsewhere. If in doubt, say Y.
 752
 753config BLK_DEV_SLC90E66
 754        tristate "SLC90E66 chipset support"
 755        select BLK_DEV_IDEDMA_PCI
 756        help
 757          This driver ensures (U)DMA support for Victory66 SouthBridges for
 758          SMsC with Intel NorthBridges.  This is an Ultra66 based chipset.
 759          The nice thing about it is that you can mix Ultra/DMA/PIO devices
 760          and it will handle timing cycles.  Since this is an improved
 761          look-a-like to the PIIX4 it should be a nice addition.
 762
 763          If you say Y here, you need to say Y to "Use DMA by default when
 764          available" as well.
 765
 766          Please read the comments at the top of
 767          <file:drivers/ide/pci/slc90e66.c>.
 768
 769config BLK_DEV_TRM290
 770        tristate "Tekram TRM290 chipset support"
 771        select BLK_DEV_IDEDMA_PCI
 772        help
 773          This driver adds support for bus master DMA transfers
 774          using the Tekram TRM290 PCI IDE chip. Volunteers are
 775          needed for further tweaking and development.
 776          Please read the comments at the top of <file:drivers/ide/pci/trm290.c>.
 777
 778config BLK_DEV_VIA82CXXX
 779        tristate "VIA82CXXX chipset support"
 780        select BLK_DEV_IDEDMA_PCI
 781        help
 782          This driver adds explicit support for VIA BusMastering IDE chips.
 783          This allows the kernel to change PIO, DMA and UDMA speeds and to
 784          configure the chip to optimum performance.
 785
 786config BLK_DEV_TC86C001
 787        tristate "Toshiba TC86C001 support"
 788        select BLK_DEV_IDEDMA_PCI
 789        help
 790        This driver adds support for Toshiba TC86C001 GOKU-S chip.
 791
 792config BLK_DEV_CELLEB
 793        tristate "Toshiba's Cell Reference Set IDE support"
 794        depends on PPC_CELLEB
 795        select BLK_DEV_IDEDMA_PCI
 796        help
 797          This driver provides support for the built-in IDE controller on
 798          Toshiba Cell Reference Board.
 799          If unsure, say Y.
 800
 801endif
 802
 803config BLK_DEV_IDE_PMAC
 804        bool "Builtin PowerMac IDE support"
 805        depends on PPC_PMAC && IDE=y && BLK_DEV_IDE=y
 806        help
 807          This driver provides support for the built-in IDE controller on
 808          most of the recent Apple Power Macintoshes and PowerBooks.
 809          If unsure, say Y.
 810
 811config BLK_DEV_IDE_PMAC_ATA100FIRST
 812        bool "Probe internal ATA/100 (Kauai) first"
 813        depends on BLK_DEV_IDE_PMAC
 814        help
 815          This option will cause the ATA/100 controller found in UniNorth2
 816          based machines (Windtunnel PowerMac, Aluminium PowerBooks, ...)
 817          to be probed before the ATA/66 and ATA/33 controllers. Without
 818          these, those machine used to have the hard disk on hdc and the
 819          CD-ROM on hda. This option changes this to more natural hda for
 820          hard disk and hdc for CD-ROM.
 821
 822config BLK_DEV_IDEDMA_PMAC
 823        bool "PowerMac IDE DMA support"
 824        depends on BLK_DEV_IDE_PMAC
 825        select BLK_DEV_IDEDMA_PCI
 826        help
 827          This option allows the driver for the built-in IDE controller on
 828          Power Macintoshes and PowerBooks to use DMA (direct memory access)
 829          to transfer data to and from memory.  Saying Y is safe and improves
 830          performance.
 831
 832config BLK_DEV_IDE_SWARM
 833        tristate "IDE for Sibyte evaluation boards"
 834        depends on SIBYTE_SB1xxx_SOC
 835
 836config BLK_DEV_IDE_AU1XXX
 837       bool "IDE for AMD Alchemy Au1200"
 838       depends on SOC_AU1200
 839choice
 840       prompt "IDE Mode for AMD Alchemy Au1200"
 841       default CONFIG_BLK_DEV_IDE_AU1XXX_PIO_DBDMA
 842       depends on SOC_AU1200 && BLK_DEV_IDE_AU1XXX
 843
 844config BLK_DEV_IDE_AU1XXX_PIO_DBDMA
 845       bool "PIO+DbDMA IDE for AMD Alchemy Au1200"
 846
 847config BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA
 848       bool "MDMA2+DbDMA IDE for AMD Alchemy Au1200"
 849       depends on SOC_AU1200 && BLK_DEV_IDE_AU1XXX
 850endchoice
 851
 852config BLK_DEV_IDE_AU1XXX_SEQTS_PER_RQ
 853       int "Maximum transfer size (KB) per request (up to 128)"
 854       default "128"
 855       depends on BLK_DEV_IDE_AU1XXX
 856
 857config IDE_ARM
 858        def_bool ARM && (ARCH_CLPS7500 || ARCH_RPC || ARCH_SHARK)
 859        select IDE_GENERIC
 860
 861config BLK_DEV_IDE_ICSIDE
 862        tristate "ICS IDE interface support"
 863        depends on ARM && ARCH_ACORN
 864        help
 865          On Acorn systems, say Y here if you wish to use the ICS IDE
 866          interface card.  This is not required for ICS partition support.
 867          If you are unsure, say N to this.
 868
 869config BLK_DEV_IDEDMA_ICS
 870        bool "ICS DMA support"
 871        depends on BLK_DEV_IDE_ICSIDE
 872        help
 873          Say Y here if you want to add DMA (Direct Memory Access) support to
 874          the ICS IDE driver.
 875
 876config BLK_DEV_IDE_RAPIDE
 877        tristate "RapIDE interface support"
 878        depends on ARM && ARCH_ACORN
 879        help
 880          Say Y here if you want to support the Yellowstone RapIDE controller
 881          manufactured for use with Acorn computers.
 882
 883config BLK_DEV_IDE_BAST
 884        tristate "Simtec BAST / Thorcom VR1000 IDE support"
 885        depends on ARM && (ARCH_BAST || MACH_VR1000)
 886        help
 887          Say Y here if you want to support the onboard IDE channels on the
 888          Simtec BAST or the Thorcom VR1000
 889
 890config ETRAX_IDE
 891        bool "ETRAX IDE support"
 892        depends on CRIS && BROKEN
 893        select BLK_DEV_IDEDMA
 894        select IDE_GENERIC
 895        help
 896          Enables the ETRAX IDE driver.
 897
 898          You can't use parallel ports or SCSI ports at the same time.
 899
 900config ETRAX_IDE_DELAY
 901        int "Delay for drives to regain consciousness"
 902        depends on ETRAX_IDE && ETRAX_ARCH_V10
 903        default 15
 904        help
 905          Number of seconds to wait for IDE drives to spin up after an IDE
 906          reset.
 907
 908choice
 909        prompt "IDE reset pin"
 910        depends on ETRAX_IDE && ETRAX_ARCH_V10
 911        default ETRAX_IDE_PB7_RESET
 912
 913config ETRAX_IDE_PB7_RESET
 914        bool "Port_PB_Bit_7"
 915        help
 916          IDE reset on pin 7 on port B
 917
 918config ETRAX_IDE_G27_RESET
 919        bool "Port_G_Bit_27"
 920        help
 921          IDE reset on pin 27 on port G
 922
 923endchoice
 924
 925config IDE_H8300
 926        bool "H8300 IDE support"
 927        depends on H8300
 928        select IDE_GENERIC
 929        default y
 930        help
 931          Enables the H8300 IDE driver.
 932
 933config BLK_DEV_GAYLE
 934        bool "Amiga Gayle IDE interface support"
 935        depends on AMIGA
 936        select IDE_GENERIC
 937        help
 938          This is the IDE driver for the Amiga Gayle IDE interface. It supports
 939          both the `A1200 style' and `A4000 style' of the Gayle IDE interface,
 940          This includes builtin IDE interfaces on some Amiga models (A600,
 941          A1200, A4000, and A4000T), and IDE interfaces on the Zorro expansion
 942          bus (M-Tech E-Matrix 530 expansion card).
 943          Say Y if you have an Amiga with a Gayle IDE interface and want to use
 944          IDE devices (hard disks, CD-ROM drives, etc.) that are connected to
 945          it.
 946          Note that you also have to enable Zorro bus support if you want to
 947          use Gayle IDE interfaces on the Zorro expansion bus.
 948
 949config BLK_DEV_IDEDOUBLER
 950        bool "Amiga IDE Doubler support (EXPERIMENTAL)"
 951        depends on BLK_DEV_GAYLE && EXPERIMENTAL
 952        ---help---
 953          This driver provides support for the so-called `IDE doublers' (made
 954          by various manufacturers, e.g. Eyetech) that can be connected to the
 955          builtin IDE interface of some Amiga models. Using such an IDE
 956          doubler, you can connect up to four instead of two IDE devices on
 957          the Amiga's builtin IDE interface.
 958
 959          Note that the normal Amiga Gayle IDE driver may not work correctly
 960          if you have an IDE doubler and don't enable this driver!
 961
 962          Say Y if you have an IDE doubler.  The driver is enabled at kernel
 963          runtime using the "ide=doubler" kernel boot parameter.
 964
 965config BLK_DEV_BUDDHA
 966        bool "Buddha/Catweasel/X-Surf IDE interface support (EXPERIMENTAL)"
 967        depends on ZORRO && EXPERIMENTAL
 968        select IDE_GENERIC
 969        help
 970          This is the IDE driver for the IDE interfaces on the Buddha, 
 971          Catweasel and X-Surf expansion boards.  It supports up to two interfaces 
 972          on the Buddha, three on the Catweasel and two on the X-Surf.
 973
 974          Say Y if you have a Buddha or Catweasel expansion board and want to
 975          use IDE devices (hard disks, CD-ROM drives, etc.) that are connected
 976          to one of its IDE interfaces.
 977
 978config BLK_DEV_FALCON_IDE
 979        bool "Falcon IDE interface support"
 980        depends on ATARI
 981        select IDE_GENERIC
 982        help
 983          This is the IDE driver for the builtin IDE interface on the Atari
 984          Falcon. Say Y if you have a Falcon and want to use IDE devices (hard
 985          disks, CD-ROM drives, etc.) that are connected to the builtin IDE
 986          interface.
 987
 988config BLK_DEV_MAC_IDE
 989        bool "Macintosh Quadra/Powerbook IDE interface support"
 990        depends on MAC
 991        select IDE_GENERIC
 992        help
 993          This is the IDE driver for the builtin IDE interface on some m68k
 994          Macintosh models. It supports both the `Quadra style' (used in
 995          Quadra/ Centris 630 and Performa 588 models) and `Powerbook style'
 996          (used in the Powerbook 150 and 190 models) IDE interface.
 997
 998          Say Y if you have such an Macintosh model and want to use IDE
 999          devices (hard disks, CD-ROM drives, etc.) that are connected to the
1000          builtin IDE interface.
1001
1002config BLK_DEV_Q40IDE
1003        bool "Q40/Q60 IDE interface support"
1004        depends on Q40
1005        select IDE_GENERIC
1006        help
1007          Enable the on-board IDE controller in the Q40/Q60.  This should
1008          normally be on; disable it only if you are running a custom hard
1009          drive subsystem through an expansion card.
1010
1011config BLK_DEV_MPC8xx_IDE
1012        bool "MPC8xx IDE support"
1013        depends on 8xx && (LWMON || IVMS8 || IVML24 || TQM8xxL) && IDE=y && BLK_DEV_IDE=y && !PPC_MERGE
1014        select IDE_GENERIC
1015        help
1016          This option provides support for IDE on Motorola MPC8xx Systems.
1017          Please see 'Type of MPC8xx IDE interface' for details.
1018
1019          If unsure, say N.
1020
1021choice
1022        prompt "Type of MPC8xx IDE interface"
1023        depends on BLK_DEV_MPC8xx_IDE
1024        default IDE_8xx_PCCARD
1025
1026config IDE_8xx_PCCARD
1027        bool "8xx_PCCARD"
1028        ---help---
1029          Select how the IDE devices are connected to the MPC8xx system:
1030
1031          8xx_PCCARD uses the 8xx internal PCMCIA interface in combination
1032          with a PC Card (e.g. ARGOSY portable Hard Disk Adapter),
1033          ATA PC Card HDDs or ATA PC Flash Cards (example: TQM8xxL
1034          systems)
1035
1036          8xx_DIRECT is used for directly connected IDE devices using the 8xx
1037          internal PCMCIA interface (example: IVMS8 systems)
1038
1039          EXT_DIRECT is used for IDE devices directly connected to the 8xx
1040          bus using some glue logic, but _not_ the 8xx internal
1041          PCMCIA interface (example: IDIF860 systems)
1042
1043config IDE_8xx_DIRECT
1044        bool "8xx_DIRECT"
1045
1046config IDE_EXT_DIRECT
1047        bool "EXT_DIRECT"
1048
1049endchoice
1050
1051# no isa -> no vlb
1052if ISA
1053
1054comment "Other IDE chipsets support"
1055comment "Note: most of these also require special kernel boot parameters"
1056
1057config BLK_DEV_4DRIVES
1058        bool "Generic 4 drives/port support"
1059        help
1060          Certain older chipsets, including the Tekram 690CD, use a single set
1061          of I/O ports at 0x1f0 to control up to four drives, instead of the
1062          customary two drives per port. Support for this can be enabled at
1063          runtime using the "ide0=four" kernel boot parameter if you say Y
1064          here.
1065
1066config BLK_DEV_ALI14XX
1067        tristate "ALI M14xx support"
1068        help
1069          This driver is enabled at runtime using the "ali14xx.probe" kernel
1070          boot parameter.  It enables support for the secondary IDE interface
1071          of the ALI M1439/1443/1445/1487/1489 chipsets, and permits faster
1072          I/O speeds to be set as well.  See the files
1073          <file:Documentation/ide.txt> and <file:drivers/ide/legacy/ali14xx.c> for
1074          more info.
1075
1076config BLK_DEV_DTC2278
1077        tristate "DTC-2278 support"
1078        help
1079          This driver is enabled at runtime using the "dtc2278.probe" kernel
1080          boot parameter. It enables support for the secondary IDE interface
1081          of the DTC-2278 card, and permits faster I/O speeds to be set as
1082          well. See the <file:Documentation/ide.txt> and
1083          <file:drivers/ide/legacy/dtc2278.c> files for more info.
1084
1085config BLK_DEV_HT6560B
1086        tristate "Holtek HT6560B support"
1087        help
1088          This driver is enabled at runtime using the "ht6560b.probe" kernel
1089          boot parameter. It enables support for the secondary IDE interface
1090          of the Holtek card, and permits faster I/O speeds to be set as well.
1091          See the <file:Documentation/ide.txt> and
1092          <file:drivers/ide/legacy/ht6560b.c> files for more info.
1093
1094config BLK_DEV_QD65XX
1095        tristate "QDI QD65xx support"
1096        help
1097          This driver is enabled at runtime using the "qd65xx.probe" kernel
1098          boot parameter.  It permits faster I/O speeds to be set.  See the
1099          <file:Documentation/ide.txt> and <file:drivers/ide/legacy/qd65xx.c> for
1100          more info.
1101
1102config BLK_DEV_UMC8672
1103        tristate "UMC-8672 support"
1104        help
1105          This driver is enabled at runtime using the "umc8672.probe" kernel
1106          boot parameter. It enables support for the secondary IDE interface
1107          of the UMC-8672, and permits faster I/O speeds to be set as well.
1108          See the files <file:Documentation/ide.txt> and
1109          <file:drivers/ide/legacy/umc8672.c> for more info.
1110
1111endif
1112
1113config BLK_DEV_IDEDMA
1114        def_bool BLK_DEV_IDEDMA_PCI || BLK_DEV_IDEDMA_PMAC || BLK_DEV_IDEDMA_ICS || BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA
1115
1116config IDE_ARCH_OBSOLETE_INIT
1117        def_bool ALPHA || (ARM && !ARCH_L7200) || BLACKFIN || X86 || IA64 || M32R || MIPS || PARISC || PPC || (SUPERH64 && BLK_DEV_IDEPCI) || SPARC
1118
1119endif
1120
1121config BLK_DEV_HD_ONLY
1122        bool "Old hard disk (MFM/RLL/IDE) driver"
1123        depends on BLK_DEV_IDE=n
1124        help
1125          There are two drivers for MFM/RLL/IDE hard disks. Most people use
1126          the newer enhanced driver, but this old one is still around for two
1127          reasons. Some older systems have strange timing problems and seem to
1128          work only with the old driver (which itself does not work with some
1129          newer systems). The other reason is that the old driver is smaller,
1130          since it lacks the enhanced functionality of the new one. This makes
1131          it a good choice for systems with very tight memory restrictions, or
1132          for systems with only older MFM/RLL/ESDI drives. Choosing the old
1133          driver can save 13 KB or so of kernel memory.
1134
1135          If you are unsure, then just choose the Enhanced IDE/MFM/RLL driver
1136          instead of this one. For more detailed information, read the
1137          Disk-HOWTO, available from
1138          <http://www.tldp.org/docs.html#howto>.
1139
1140config BLK_DEV_HD
1141        def_bool BLK_DEV_HD_IDE || BLK_DEV_HD_ONLY
1142
1143endif # IDE
1144
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