2 # For a description of the syntax of this configuration file,
3 # see scripts/kbuild/config-language.txt.
6 menu "Linux System Utilities"
12 dmesg is used to examine or control the kernel ring buffer. When the
13 Linux kernel prints messages to the system log, they are stored in
14 the kernel ring buffer. You can use dmesg to print the kernel's ring
15 buffer, clear the kernel ring buffer, change the size of the kernel
16 ring buffer, and change the priority level at which kernel messages
17 are also logged to the system console. Enable this option if you
18 wish to enable the 'dmesg' utility.
20 config FEATURE_DMESG_PRETTY
21 bool "Pretty dmesg output"
25 If you wish to scrub the syslog level from the output, say 'Y' here.
26 The syslog level is a string prefixed to every line with the form "<#>".
28 With this option you will see:
30 Linux version 2.6.17.4 .....
31 BIOS-provided physical RAM map:
32 BIOS-e820: 0000000000000000 - 000000000009f000 (usable)
34 Without this option you will see:
36 <5>Linux version 2.6.17.4 .....
37 <6>BIOS-provided physical RAM map:
38 <6> BIOS-e820: 0000000000000000 - 000000000009f000 (usable)
44 fbset is used to show or change the settings of a Linux frame buffer
45 device. The frame buffer device provides a simple and unique
46 interface to access a graphics display. Enable this option
47 if you wish to enable the 'fbset' utility.
49 config FEATURE_FBSET_FANCY
50 bool "Turn on extra fbset options"
54 This option enables extended fbset options, allowing one to set the
55 framebuffer size, color depth, etc. interface to access a graphics
56 display. Enable this option if you wish to enable extended fbset
59 config FEATURE_FBSET_READMODE
60 bool "Turn on fbset readmode support"
64 This option allows fbset to read the video mode database stored by
65 default as /etc/fb.modes, which can be used to set frame buffer
66 device to pre-defined video modes.
72 fdflush is only needed when changing media on slightly-broken
73 removable media drives. It is used to make Linux believe that a
74 hardware disk-change switch has been actuated, which causes Linux to
75 forget anything it has cached from the previous media. If you have
76 such a slightly-broken drive, you will need to run fdflush every time
77 you change a disk. Most people have working hardware and can safely
84 fdformat is used to low-level format a floppy disk.
90 The fdisk utility is used to divide hard disks into one or more
91 logical disks, which are generally called partitions. This utility
92 can be used to list and edit the set of partitions or BSD style
93 'disk slices' that are defined on a hard drive.
95 config FDISK_SUPPORT_LARGE_DISKS
96 bool "Support over 4GB disks"
100 Enable this option to support large disks > 4GB.
102 config FEATURE_FDISK_WRITABLE
107 Enabling this option allows you to create or change a partition table
108 and write those changes out to disk. If you leave this option
109 disabled, you will only be able to view the partition table.
111 config FEATURE_AIX_LABEL
112 bool "Support AIX disklabels"
114 depends on FDISK && FEATURE_FDISK_WRITABLE
116 Enabling this option allows you to create or change AIX disklabels.
117 Most people can safely leave this option disabled.
119 config FEATURE_SGI_LABEL
120 bool "Support SGI disklabels"
122 depends on FDISK && FEATURE_FDISK_WRITABLE
124 Enabling this option allows you to create or change SGI disklabels.
125 Most people can safely leave this option disabled.
127 config FEATURE_SUN_LABEL
128 bool "Support SUN disklabels"
130 depends on FDISK && FEATURE_FDISK_WRITABLE
132 Enabling this option allows you to create or change SUN disklabels.
133 Most people can safely leave this option disabled.
135 config FEATURE_OSF_LABEL
136 bool "Support BSD disklabels"
138 depends on FDISK && FEATURE_FDISK_WRITABLE
140 Enabling this option allows you to create or change BSD disklabels
141 and define and edit BSD disk slices.
143 config FEATURE_FDISK_ADVANCED
144 bool "Support expert mode"
146 depends on FDISK && FEATURE_FDISK_WRITABLE
148 Enabling this option allows you to do terribly unsafe things like
149 define arbitrary drive geometry, move the beginning of data in a
150 partition, and similarly evil things. Unless you have a very good
151 reason you would be wise to leave this disabled.
158 This is similar to the findfs program that is part of the e2fsprogs
159 package. However, the e2fsprogs version only support ext2/3. This
160 version supports those in addition to FAT, swap, and ReiserFS.
162 With all submodules selected, it will add ~8k to busybox.
168 Linux allows you to create ramdisks. This utility allows you to
169 delete them and completely free all memory that was used for the
170 ramdisk. For example, if you boot Linux into a ramdisk and later
171 pivot_root, you may want to free the memory that is allocated to the
172 ramdisk. If you have no use for freeing memory from a ramdisk, leave
179 The minix filesystem is a nice, small, compact, read-write filesystem
180 with little overhead. It is not a journaling filesystem however and
181 can experience corruption if it is not properly unmounted or if the
182 power goes off in the middle of a write. This utility allows you to
183 check for and attempt to repair any corruption that occurs to a minix
190 The minix filesystem is a nice, small, compact, read-write filesystem
191 with little overhead. If you wish to be able to create minix filesystems
192 this utility will do the job for you.
194 comment "Minix filesystem support"
195 depends on FSCK_MINIX || MKFS_MINIX
197 config FEATURE_MINIX2
198 bool "Support Minix fs v2 (fsck_minix/mkfs_minix)"
200 depends on FSCK_MINIX || MKFS_MINIX
202 If you wish to be able to create version 2 minix filesystems, enable this.
203 If you enabled 'mkfs_minix' then you almost certainly want to be using the
204 version 2 filesystem support.
210 The getopt utility is used to break up (parse) options in command
211 lines to make it easy to write complex shell scripts that also check
212 for legal (and illegal) options. If you want to write horribly
213 complex shell scripts, or use some horribly complex shell script
214 written by others, this utility may be for you. Most people will
215 wisely leave this disabled.
221 The hexdump utility is used to display binary data in a readable
222 way that is comparable to the output from most hex editors.
224 config FEATURE_HEXDUMP_REVERSE
225 bool "Support -R, reverse of 'hexdump -Cv'"
229 The hexdump utility is used to display binary data in an ascii
230 readable way. This option creates binary data from an ascii input.
231 NB: this option is non-standard. It's unwise to use it in scripts
232 aimed to be portable.
239 hd is an alias to hexdump -C.
245 The hwclock utility is used to read and set the hardware clock
246 on a system. This is primarily used to set the current time on
247 shutdown in the hardware clock, so the hardware will keep the
248 correct time when Linux is _not_ running.
250 config FEATURE_HWCLOCK_LONG_OPTIONS
251 bool "Support long options (--hctosys,...)"
253 depends on HWCLOCK && GETOPT_LONG
255 By default, the hwclock utility only uses short options. If you
256 are overly fond of its long options, such as --hctosys, --utc, etc)
257 then enable this option.
259 config FEATURE_HWCLOCK_ADJTIME_FHS
260 bool "Use FHS /var/lib/hwclock/adjtime"
264 Starting with FHS 2.3, the adjtime state file is supposed to exist
265 at /var/lib/hwclock/adjtime instead of /etc/adjtime. If you wish
266 to use the FHS behavior, answer Y here, otherwise answer N for the
267 classic /etc/adjtime path.
269 http://www.pathname.com/fhs/pub/fhs-2.3.html#VARLIBHWCLOCKSTATEDIRECTORYFORHWCLO
276 The ipcrm utility allows the removal of System V interprocess
277 communication (IPC) objects and the associated data structures
285 The ipcs utility is used to provide information on the currently
286 allocated System V interprocess (IPC) objects in the system.
292 losetup is used to associate or detach a loop device with a regular
293 file or block device, and to query the status of a loop device. This
294 version does not currently support enabling data encryption.
300 mdev is a mini-udev implementation for dynamically creating device
301 nodes in the /dev directory.
303 For more information, please see docs/mdev.txt
305 config FEATURE_MDEV_CONF
306 bool "Support /etc/mdev.conf"
310 Add support for the mdev config file to control ownership and
311 permissions of the device nodes.
313 For more information, please see docs/mdev.txt
315 config FEATURE_MDEV_RENAME
316 bool "Support subdirs/symlinks"
318 depends on FEATURE_MDEV_CONF
320 Add support for renaming devices and creating symlinks.
322 For more information, please see docs/mdev.txt
324 config FEATURE_MDEV_EXEC
325 bool "Support command execution at device addition/removal"
327 depends on FEATURE_MDEV_CONF
329 This adds support for an optional field to /etc/mdev.conf for
330 executing commands when devices are created/removed.
332 For more information, please see docs/mdev.txt
334 config FEATURE_MDEV_LOAD_FIRMWARE
335 bool "Support loading of firmwares"
339 Some devices need to load firmware before they can be usable.
341 These devices will request userspace look up the files in
342 /lib/firmware/ and if it exists, send it to the kernel for
343 loading into the hardware.
349 The mkswap utility is used to configure a file or disk partition as
350 Linux swap space. This allows Linux to use the entire file or
351 partition as if it were additional RAM, which can greatly increase
352 the capability of low-memory machines. This additional memory is
353 much slower than real RAM, but can be very helpful at preventing your
354 applications being killed by the Linux out of memory (OOM) killer.
355 Once you have created swap space using 'mkswap' you need to enable
356 the swap space using the 'swapon' utility.
358 config FEATURE_MKSWAP_V0
359 bool "Version 0 support"
362 # depends on MKSWAP && DEPRECATED
364 Enable support for the old v0 style.
365 If your kernel is older than 2.1.117, then v0 support is the
372 more is a simple utility which allows you to read text one screen
373 sized page at a time. If you want to read text that is larger than
374 the screen, and you are using anything faster than a 300 baud modem,
375 you will probably find this utility very helpful. If you don't have
376 any need to reading text files, you can leave this disabled.
378 config FEATURE_USE_TERMIOS
379 bool "Use termios to manipulate the screen"
381 depends on MORE || TOP
383 This option allows utilities such as 'more' and 'top' to determine
384 the size of the screen. If you leave this disabled, your utilities
385 that display things on the screen will be especially primitive and
386 will be unable to determine the current screen size, and will be
387 unable to move the cursor.
390 bool "Routines for detecting label and uuid on common filesystems"
395 config FEATURE_VOLUMEID_EXT
396 bool "Ext filesystem"
402 config FEATURE_VOLUMEID_REISERFS
403 bool "Reiser filesystem"
409 config FEATURE_VOLUMEID_FAT
410 bool "fat filesystem"
416 config FEATURE_VOLUMEID_HFS
417 bool "hfs filesystem"
423 config FEATURE_VOLUMEID_JFS
424 bool "jfs filesystem"
430 ### config FEATURE_VOLUMEID_UFS
431 ### bool "ufs filesystem"
433 ### depends on VOLUMEID
437 config FEATURE_VOLUMEID_XFS
438 bool "xfs filesystem"
444 config FEATURE_VOLUMEID_NTFS
445 bool "ntfs filesystem"
451 config FEATURE_VOLUMEID_ISO9660
452 bool "iso9660 filesystem"
458 config FEATURE_VOLUMEID_UDF
459 bool "udf filesystem"
465 config FEATURE_VOLUMEID_LUKS
466 bool "luks filesystem"
472 config FEATURE_VOLUMEID_LINUXSWAP
473 bool "linux swap filesystem"
479 ### config FEATURE_VOLUMEID_LVM
482 ### depends on VOLUMEID
486 config FEATURE_VOLUMEID_CRAMFS
487 bool "cramfs filesystem"
493 ### config FEATURE_VOLUMEID_HPFS
494 ### bool "hpfs filesystem"
496 ### depends on VOLUMEID
500 config FEATURE_VOLUMEID_ROMFS
501 bool "romfs filesystem"
507 config FEATURE_VOLUMEID_SYSV
508 bool "sysv filesystem"
514 ### config FEATURE_VOLUMEID_MINIX
515 ### bool "minix filesystem"
517 ### depends on VOLUMEID
521 ### These only detect partition tables - not used (yet?)
522 ### config FEATURE_VOLUMEID_MAC
523 ### bool "mac filesystem"
525 ### depends on VOLUMEID
529 ### config FEATURE_VOLUMEID_MSDOS
530 ### bool "msdos filesystem"
532 ### depends on VOLUMEID
536 config FEATURE_VOLUMEID_OCFS2
537 bool "ocfs2 filesystem"
543 ### config FEATURE_VOLUMEID_HIGHPOINTRAID
544 ### bool "highpoint raid"
546 ### depends on VOLUMEID
550 ### config FEATURE_VOLUMEID_ISWRAID
551 ### bool "intel raid"
553 ### depends on VOLUMEID
557 ### config FEATURE_VOLUMEID_LSIRAID
560 ### depends on VOLUMEID
564 ### config FEATURE_VOLUMEID_VIARAID
567 ### depends on VOLUMEID
571 ### config FEATURE_VOLUMEID_SILICONRAID
572 ### bool "silicon raid"
574 ### depends on VOLUMEID
578 ### config FEATURE_VOLUMEID_NVIDIARAID
579 ### bool "nvidia raid"
581 ### depends on VOLUMEID
585 ### config FEATURE_VOLUMEID_PROMISERAID
586 ### bool "promise raid"
588 ### depends on VOLUMEID
592 config FEATURE_VOLUMEID_LINUXRAID
603 All files and filesystems in Unix are arranged into one big directory
604 tree. The 'mount' utility is used to graft a filesystem onto a
605 particular part of the tree. A filesystem can either live on a block
606 device, or it can be accessible over the network, as is the case with
607 NFS filesystems. Most people using BusyBox will also want to enable
610 config FEATURE_MOUNT_FAKE
611 bool "Support option -f"
615 Enable support for faking a file system mount.
617 config FEATURE_MOUNT_VERBOSE
618 bool "Support option -v"
622 Enable multi-level -v[vv...] verbose messages. Useful if you
623 debug mount problems and want to see what is exactly passed
626 config FEATURE_MOUNT_HELPERS
627 bool "Support mount helpers"
631 Enable mounting of virtual file systems via external helpers.
632 E.g. "mount obexfs#-b00.11.22.33.44.55 /mnt" will in effect call
633 "obexfs -b00.11.22.33.44.55 /mnt"
634 Also "mount -t sometype [-o opts] fs /mnt" will try
635 "sometype [-o opts] fs /mnt" if simple mount syscall fails.
636 The idea is to use such virtual filesystems in /etc/fstab.
638 config FEATURE_MOUNT_LABEL
639 bool "Support specifiying devices by label or UUID"
644 This allows for specifying a device by label or uuid, rather than by
645 name. This feature utilizes the same functionality as findfs.
647 config FEATURE_MOUNT_NFS
648 bool "Support mounting NFS file systems"
651 select FEATURE_HAVE_RPC
652 select FEATURE_SYSLOG
654 Enable mounting of NFS file systems.
656 config FEATURE_MOUNT_CIFS
657 bool "Support mounting CIFS/SMB file systems"
661 Enable support for samba mounts.
663 config FEATURE_MOUNT_FLAGS
665 bool "Support lots of -o flags in mount"
668 Without this, mount only supports ro/rw/remount. With this, it
669 supports nosuid, suid, dev, nodev, exec, noexec, sync, async, atime,
670 noatime, diratime, nodiratime, loud, bind, move, shared, slave,
671 private, unbindable, rshared, rslave, rprivate, and runbindable.
673 config FEATURE_MOUNT_FSTAB
675 bool "Support /etc/fstab and -a"
678 Support mount all and looking for files in /etc/fstab.
684 The pivot_root utility swaps the mount points for the root filesystem
685 with some other mounted filesystem. This allows you to do all sorts
686 of wild and crazy things with your Linux system and is far more
687 powerful than 'chroot'.
689 Note: This is for initrd in linux 2.4. Under initramfs (introduced
690 in linux 2.6) use switch_root instead.
696 The rdate utility allows you to synchronize the date and time of your
697 system clock with the date and time of a remote networked system using
698 the RFC868 protocol, which is built into the inetd daemon on most
705 This allows you to parse /proc/profile for basic profiling.
711 Enter a system sleep state until specified wakeup time.
717 The linux32 utility is used to create a 32bit environment for the
718 specified program (usually a shell). It only makes sense to have
719 this util on a system that supports both 64bit and 32bit userland
720 (like amd64/x86, ppc64/ppc, sparc64/sparc, etc...).
726 This option enables both the 'swapon' and the 'swapoff' utilities.
727 Once you have created some swap space using 'mkswap', you also need
728 to enable your swap space with the 'swapon' utility. The 'swapoff'
729 utility is used, typically at system shutdown, to disable any swap
730 space. If you are not using any swap space, you can leave this
737 The switch_root utility is used from initramfs to select a new
738 root device. Under initramfs, you have to use this instead of
739 pivot_root. (Stop reading here if you don't care why.)
741 Booting with initramfs extracts a gzipped cpio archive into rootfs
742 (which is a variant of ramfs/tmpfs). Because rootfs can't be moved
743 or unmounted*, pivot_root will not work from initramfs. Instead,
744 switch_root deletes everything out of rootfs (including itself),
745 does a mount --move that overmounts rootfs with the new root, and
746 then execs the specified init program.
748 * Because the Linux kernel uses rootfs internally as the starting
749 and ending point for searching through the kernel's doubly linked
750 list of active mount points. That's why.
756 When you want to remove a mounted filesystem from its current mount point,
757 for example when you are shutting down the system, the 'umount' utility is
758 the tool to use. If you enabled the 'mount' utility, you almost certainly
759 also want to enable 'umount'.
761 config FEATURE_UMOUNT_ALL
762 bool "Support option -a"
766 Support -a option to unmount all currently mounted filesystems.
768 comment "Common options for mount/umount"
769 depends on MOUNT || UMOUNT
771 config FEATURE_MOUNT_LOOP
772 bool "Support loopback mounts"
774 depends on MOUNT || UMOUNT
776 Enabling this feature allows automatic mounting of files (containing
777 filesystem images) via the linux kernel's loopback devices. The mount
778 command will detect you are trying to mount a file instead of a block
779 device, and transparently associate the file with a loopback device.
780 The umount command will also free that loopback device.
782 You can still use the 'losetup' utility (to manually associate files
783 with loop devices) if you need to do something advanced, such as
784 specify an offset or cryptographic options to the loopback device.
785 (If you don't want umount to free the loop device, use "umount -D".)
787 config FEATURE_MTAB_SUPPORT
788 bool "Support for the old /etc/mtab file"
790 depends on MOUNT || UMOUNT
791 select FEATURE_MOUNT_FAKE
793 Historically, Unix systems kept track of the currently mounted
794 partitions in the file "/etc/mtab". These days, the kernel exports
795 the list of currently mounted partitions in "/proc/mounts", rendering
796 the old mtab file obsolete. (In modern systems, /etc/mtab should be
797 a symlink to /proc/mounts.)
799 The only reason to have mount maintain an /etc/mtab file itself is if
800 your stripped-down embedded system does not have a /proc directory.
801 If you must use this, keep in mind it's inherently brittle (for
802 example a mount under chroot won't update it), can't handle modern
803 features like separate per-process filesystem namespaces, requires
804 that your /etc directory be writeable, tends to get easily confused
805 by --bind or --move mounts, won't update if you rename a directory
806 that contains a mount point, and so on. (In brief: avoid.)
808 About the only reason to use this is if you've removed /proc from