Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 1 | # |
| 2 | # For a description of the syntax of this configuration file, |
| 3 | # see scripts/kbuild/config-language.txt. |
| 4 | # |
| 5 | |
| 6 | menu "Linux System Utilities" |
| 7 | |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 8 | config CONFIG_DMESG |
| 9 | bool "dmesg" |
| 10 | default n |
| 11 | help |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 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. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 19 | |
| 20 | config CONFIG_FBSET |
| 21 | bool "fbset" |
| 22 | default n |
| 23 | help |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 24 | fbset is used to show or change the settings of a Linux frame buffer |
| 25 | device. The frame buffer device provides a simple and unique |
Eric Andersen | 88c916b | 2003-10-22 09:58:56 +0000 | [diff] [blame] | 26 | interface to access a graphics display. Enable this option |
| 27 | if you wish to enable the 'fbset' utility. |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 28 | |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 29 | config CONFIG_FEATURE_FBSET_FANCY |
| 30 | bool " Turn on extra fbset options" |
| 31 | default n |
| 32 | depends on CONFIG_FBSET |
| 33 | help |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 34 | This option enables extended fbset options, allowing one to set the |
Eric Andersen | 88c916b | 2003-10-22 09:58:56 +0000 | [diff] [blame] | 35 | framebuffer size, color depth, etc. interface to access a graphics |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 36 | display. Enable this option if you wish to enable extended fbset |
| 37 | options. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 38 | |
| 39 | config CONFIG_FEATURE_FBSET_READMODE |
| 40 | bool " Turn on fbset readmode support" |
| 41 | default n |
| 42 | depends on CONFIG_FBSET |
| 43 | help |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 44 | This option allows fbset to read the video mode database stored by |
| 45 | default as /etc/fb.modes, which can be used to set frame buffer |
| 46 | device to pre-defined video modes. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 47 | |
| 48 | config CONFIG_FDFLUSH |
| 49 | bool "fdflush" |
| 50 | default n |
| 51 | help |
Eric Andersen | 88c916b | 2003-10-22 09:58:56 +0000 | [diff] [blame] | 52 | fdflush is only needed when changing media on slightly-broken |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 53 | removable media drives. It is used to make Linux believe that a |
| 54 | hardware disk-change switch has been actuated, which causes Linux to |
| 55 | forget anything it has cached from the previous media. If you have |
| 56 | such a slightly-broken drive, you will need to run fdflush every time |
| 57 | you change a disk. Most people have working hardware and can safely |
Eric Andersen | 88c916b | 2003-10-22 09:58:56 +0000 | [diff] [blame] | 58 | leave this disabled. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 59 | |
Eric Andersen | 01c3d40 | 2003-07-05 07:51:31 +0000 | [diff] [blame] | 60 | config CONFIG_FDFORMAT |
| 61 | bool "fdformat" |
| 62 | default n |
| 63 | help |
Eric Andersen | 88c916b | 2003-10-22 09:58:56 +0000 | [diff] [blame] | 64 | fdformat is used to low-level format a floppy disk. |
Eric Andersen | 01c3d40 | 2003-07-05 07:51:31 +0000 | [diff] [blame] | 65 | |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 66 | config CONFIG_FDISK |
| 67 | bool "fdisk" |
| 68 | default n |
| 69 | help |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 70 | The fdisk utility is used to divide hard disks into one or more |
| 71 | logical disks, which are generally called partitions. This utility |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 72 | can be used to list and edit the set of partitions or BSD style |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 73 | 'disk slices' that are defined on a hard drive. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 74 | |
Eric Andersen | 84bdea8 | 2004-05-19 10:49:17 +0000 | [diff] [blame] | 75 | config FDISK_SUPPORT_LARGE_DISKS |
| 76 | bool " support over 4GB disks" |
| 77 | default y |
| 78 | depends on CONFIG_FDISK |
Eric Andersen | 84bdea8 | 2004-05-19 10:49:17 +0000 | [diff] [blame] | 79 | help |
| 80 | Enable this option to support large disks > 4GB. |
| 81 | |
Glenn L McGrath | 4dcc2dd | 2003-01-04 11:56:06 +0000 | [diff] [blame] | 82 | config CONFIG_FEATURE_FDISK_WRITABLE |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 83 | bool " Write support" |
Glenn L McGrath | 4dcc2dd | 2003-01-04 11:56:06 +0000 | [diff] [blame] | 84 | default y |
| 85 | depends on CONFIG_FDISK |
| 86 | help |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 87 | Enabling this option allows you to create or change a partition table |
| 88 | and write those changes out to disk. If you leave this option |
| 89 | disabled, you will only be able to view the partition table. |
Glenn L McGrath | 4dcc2dd | 2003-01-04 11:56:06 +0000 | [diff] [blame] | 90 | |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 91 | config CONFIG_FEATURE_AIX_LABEL |
| 92 | bool " Support AIX disklabels" |
| 93 | default n |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 94 | depends on CONFIG_FDISK && CONFIG_FEATURE_FDISK_WRITABLE |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 95 | help |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 96 | Enabling this option allows you to create or change AIX disklabels. |
| 97 | Most people can safely leave this option disabled. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 98 | |
| 99 | config CONFIG_FEATURE_SGI_LABEL |
| 100 | bool " Support SGI disklabels" |
| 101 | default n |
Glenn L McGrath | 4dcc2dd | 2003-01-04 11:56:06 +0000 | [diff] [blame] | 102 | depends on CONFIG_FDISK && CONFIG_FEATURE_FDISK_WRITABLE |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 103 | help |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 104 | Enabling this option allows you to create or change SGI disklabels. |
| 105 | Most people can safely leave this option disabled. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 106 | |
| 107 | config CONFIG_FEATURE_SUN_LABEL |
| 108 | bool " Support SUN disklabels" |
| 109 | default n |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 110 | depends on CONFIG_FDISK && CONFIG_FEATURE_FDISK_WRITABLE |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 111 | help |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 112 | Enabling this option allows you to create or change SUN disklabels. |
| 113 | Most people can safely leave this option disabled. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 114 | |
| 115 | config CONFIG_FEATURE_OSF_LABEL |
| 116 | bool " Support BSD disklabels" |
| 117 | default n |
Glenn L McGrath | 4dcc2dd | 2003-01-04 11:56:06 +0000 | [diff] [blame] | 118 | depends on CONFIG_FDISK && CONFIG_FEATURE_FDISK_WRITABLE |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 119 | help |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 120 | Enabling this option allows you to create or change BSD disklabels |
| 121 | and define and edit BSD disk slices. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 122 | |
| 123 | config CONFIG_FEATURE_FDISK_ADVANCED |
| 124 | bool " Support expert mode" |
| 125 | default n |
Glenn L McGrath | 4dcc2dd | 2003-01-04 11:56:06 +0000 | [diff] [blame] | 126 | depends on CONFIG_FDISK && CONFIG_FEATURE_FDISK_WRITABLE |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 127 | help |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 128 | Enabling this option allows you to do terribly unsafe things like |
| 129 | define arbitrary drive geometry, move the beginning of data in a |
| 130 | partition, and similarly evil things. Unless you have a very good |
| 131 | reason you would be wise to leave this disabled. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 132 | |
| 133 | config CONFIG_FREERAMDISK |
| 134 | bool "freeramdisk" |
| 135 | default n |
| 136 | help |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 137 | Linux allows you to create ramdisks. This utility allows you to |
| 138 | delete them and completely free all memory that was used for the |
| 139 | ramdisk. For example, if you boot Linux into a ramdisk and later |
| 140 | pivot_root, you may want to free the memory that is allocated to the |
| 141 | ramdisk. If you have no use for freeing memory from a ramdisk, leave |
| 142 | this disabled. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 143 | |
| 144 | config CONFIG_FSCK_MINIX |
| 145 | bool "fsck_minix" |
| 146 | default n |
| 147 | help |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 148 | The minix filesystem is a nice, small, compact, read-write filesystem |
| 149 | with little overhead. It is not a journaling filesystem however and |
Eric Andersen | 88c916b | 2003-10-22 09:58:56 +0000 | [diff] [blame] | 150 | can experience corruption if it is not properly unmounted or if the |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 151 | power goes off in the middle of a write. This utility allows you to |
| 152 | check for and attempt to repair any corruption that occurs to a minix |
| 153 | filesystem. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 154 | |
| 155 | config CONFIG_MKFS_MINIX |
| 156 | bool "mkfs_minix" |
| 157 | default n |
| 158 | help |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 159 | The minix filesystem is a nice, small, compact, read-write filesystem |
| 160 | with little overhead. If you wish to be able to create minix filesystems |
| 161 | this utility will do the job for you. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 162 | |
| 163 | comment "Minix filesystem support" |
| 164 | depends on CONFIG_FSCK_MINIX || CONFIG_MKFS_MINIX |
| 165 | |
| 166 | config CONFIG_FEATURE_MINIX2 |
| 167 | bool " Support Minix fs v2 (fsck_minix/mkfs_minix)" |
| 168 | default y |
| 169 | depends on CONFIG_FSCK_MINIX || CONFIG_MKFS_MINIX |
| 170 | help |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 171 | If you wish to be able to create version 2 minix filesystems, enable this. |
| 172 | If you enabled 'mkfs_minix' then you almost certainly want to be using the |
| 173 | version 2 filesystem support. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 174 | |
| 175 | config CONFIG_GETOPT |
| 176 | bool "getopt" |
| 177 | default n |
| 178 | help |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 179 | The getopt utility is used to break up (parse) options in command |
| 180 | lines to make it easy to write complex shell scripts that also check |
| 181 | for legal (and illegal) options. If you want to write horribly |
| 182 | complex shell scripts, or use some horribly complex shell script |
| 183 | written by others, this utility may be for you. Most people will |
| 184 | wisely leave this disabled. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 185 | |
| 186 | config CONFIG_HEXDUMP |
| 187 | bool "hexdump" |
| 188 | default n |
| 189 | help |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 190 | The hexdump utility is used to display binary data in a readable |
| 191 | way that is comparable to the output from most hex editors. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 192 | |
| 193 | config CONFIG_HWCLOCK |
| 194 | bool "hwclock" |
| 195 | default n |
| 196 | help |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 197 | The hwclock utility is used to read and set the hardware clock |
Eric Andersen | 88c916b | 2003-10-22 09:58:56 +0000 | [diff] [blame] | 198 | on a system. This is primarily used to set the current time on |
| 199 | shutdown in the hardware clock, so the hardware will keep the |
| 200 | correct time when Linux is _not_ running. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 201 | |
| 202 | config CONFIG_FEATURE_HWCLOCK_LONGOPTIONS |
| 203 | bool " Support long options (--hctosys,...)" |
| 204 | default n |
| 205 | depends on CONFIG_HWCLOCK |
| 206 | help |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 207 | By default, the hwclock utility only uses short options. If you |
Eric Andersen | 88c916b | 2003-10-22 09:58:56 +0000 | [diff] [blame] | 208 | are overly fond of its long options, such as --hctosys, --utc, etc) |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 209 | then enable this option. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 210 | |
Mike Frysinger | 747fc5d | 2005-09-28 03:21:21 +0000 | [diff] [blame] | 211 | config CONFIG_FEATURE_HWCLOCK_ADJTIME_FHS |
| 212 | bool " Use FHS /var/lib/hwclock/adjtime" |
| 213 | default y |
| 214 | depends on CONFIG_HWCLOCK |
| 215 | help |
| 216 | Starting with FHS 2.3, the adjtime state file is supposed to exist |
Tim Riker | c1ef7bd | 2006-01-25 00:08:53 +0000 | [diff] [blame] | 217 | at /var/lib/hwclock/adjtime instead of /etc/adjtime. If you wish |
Mike Frysinger | 747fc5d | 2005-09-28 03:21:21 +0000 | [diff] [blame] | 218 | to use the FHS behavior, answer Y here, otherwise answer N for the |
| 219 | classic /etc/adjtime path. |
| 220 | |
| 221 | http://www.pathname.com/fhs/pub/fhs-2.3.html#VARLIBHWCLOCKSTATEDIRECTORYFORHWCLO |
| 222 | |
Rob Landley | 6eb1e41 | 2005-06-20 04:30:36 +0000 | [diff] [blame] | 223 | config CONFIG_IPCRM |
| 224 | bool "ipcrm" |
| 225 | default n |
Eric Andersen | 576db48 | 2005-06-23 18:58:57 +0000 | [diff] [blame] | 226 | select CONFIG_FEATURE_SUID |
Rob Landley | 6eb1e41 | 2005-06-20 04:30:36 +0000 | [diff] [blame] | 227 | help |
| 228 | The ipcrm utility allows the removal of System V interprocess |
| 229 | communication (IPC) objects and the associated data structures |
| 230 | from the system. |
| 231 | |
| 232 | config CONFIG_IPCS |
| 233 | bool "ipcs" |
| 234 | default n |
Eric Andersen | 576db48 | 2005-06-23 18:58:57 +0000 | [diff] [blame] | 235 | select CONFIG_FEATURE_SUID |
Rob Landley | 6eb1e41 | 2005-06-20 04:30:36 +0000 | [diff] [blame] | 236 | help |
| 237 | The ipcs utility is used to provide information on the currently |
| 238 | allocated System V interprocess (IPC) objects in the system. |
| 239 | |
Mike Frysinger | 75aa192 | 2005-09-24 23:12:38 +0000 | [diff] [blame] | 240 | config CONFIG_LOSETUP |
| 241 | bool "losetup" |
| 242 | default n |
| 243 | help |
| 244 | losetup is used to associate or detach a loop device with a regular |
| 245 | file or block device, and to query the status of a loop device. This |
| 246 | version does not currently support enabling data encryption. |
| 247 | |
Rob Landley | 70f7ef7 | 2005-12-13 08:21:33 +0000 | [diff] [blame] | 248 | config CONFIG_MDEV |
| 249 | bool "mdev" |
| 250 | default n |
| 251 | help |
| 252 | mdev is a mini-udev implementation: call it with -s to populate |
| 253 | /dev from /sys, then "echo /sbin/mdev > /sys/kernel/hotplug" to |
| 254 | have it handle hotplug events afterwards. Device names are taken |
| 255 | from sysfs. |
| 256 | |
Rob Landley | b56c285 | 2005-12-17 10:52:30 +0000 | [diff] [blame] | 257 | config CONFIG_FEATURE_MDEV_CONF |
Rob Landley | 70f7ef7 | 2005-12-13 08:21:33 +0000 | [diff] [blame] | 258 | bool " Support /etc/mdev.conf" |
| 259 | default n |
| 260 | depends on CONFIG_MDEV |
| 261 | help |
| 262 | The mdev config file contains lines that look like: |
| 263 | |
| 264 | hd[a-z][0-9]* 0:3 660 |
| 265 | |
| 266 | That's device name (with regex match), uid:gid, and permissions. |
| 267 | |
| 268 | Optionally, that can be followed (on the same line) by an asterisk |
| 269 | and a command line to run after creating the corresponding device(s), |
| 270 | ala: |
| 271 | |
| 272 | hdc root:cdrom 660 *ln -s hdc cdrom |
| 273 | |
| 274 | Config file parsing stops on the first matching line. If no config |
| 275 | entry is matched, devices are created with default 0:0 660. (Make |
| 276 | the last line match .* to override this.) |
| 277 | |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 278 | config CONFIG_MKSWAP |
| 279 | bool "mkswap" |
| 280 | default n |
| 281 | help |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 282 | The mkswap utility is used to configure a file or disk partition as |
| 283 | Linux swap space. This allows Linux to use the entire file or |
| 284 | partition as if it were additional RAM, which can greatly increase |
| 285 | the capability of low-memory machines. This additional memory is |
| 286 | much slower than real RAM, but can be very helpful at preventing your |
Eric Andersen | 88c916b | 2003-10-22 09:58:56 +0000 | [diff] [blame] | 287 | applications being killed by the Linux out of memory (OOM) killer. |
| 288 | Once you have created swap space using 'mkswap' you need to enable |
| 289 | the swap space using the 'swapon' utility. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 290 | |
| 291 | config CONFIG_MORE |
| 292 | bool "more" |
| 293 | default n |
| 294 | help |
Eric Andersen | 88c916b | 2003-10-22 09:58:56 +0000 | [diff] [blame] | 295 | more is a simple utility which allows you to read text one screen |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 296 | sized page at a time. If you want to read text that is larger than |
| 297 | the screen, and you are using anything faster than a 300 baud modem, |
| 298 | you will probably find this utility very helpful. If you don't have |
| 299 | any need to reading text files, you can leave this disabled. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 300 | |
| 301 | config CONFIG_FEATURE_USE_TERMIOS |
| 302 | bool " Use termios to manipulate the screen" |
| 303 | default y |
| 304 | depends on CONFIG_MORE |
| 305 | help |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 306 | This option allows utilities such as 'more' and 'top' to determine |
| 307 | the size of the screen. If you leave this disabled, your utilities |
Eric Andersen | 88c916b | 2003-10-22 09:58:56 +0000 | [diff] [blame] | 308 | that display things on the screen will be especially primitive and |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 309 | will be unable to determine the current screen size, and will be |
| 310 | unable to move the cursor. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 311 | |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 312 | config CONFIG_PIVOT_ROOT |
| 313 | bool "pivot_root" |
| 314 | default n |
| 315 | help |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 316 | The pivot_root utility swaps the mount points for the root filesystem |
| 317 | with some other mounted filesystem. This allows you to do all sorts |
| 318 | of wild and crazy things with your Linux system and is far more |
| 319 | powerful than 'chroot'. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 320 | |
Rob Landley | 0f34a82 | 2005-10-27 22:55:50 +0000 | [diff] [blame] | 321 | Note: This is for initrd in linux 2.4. Under initramfs (introduced |
| 322 | in linux 2.6) use switch_root instead. |
| 323 | |
| 324 | config CONFIG_SWITCH_ROOT |
| 325 | bool "switch_root" |
| 326 | default n |
| 327 | help |
| 328 | The switch_root utility is used from initramfs to select a new |
| 329 | root device. Under initramfs, you have to use this instead of |
| 330 | pivot_root. (Stop reading here if you don't care why.) |
| 331 | |
| 332 | Booting with initramfs extracts a gzipped cpio archive into rootfs |
| 333 | (which is a variant of ramfs/tmpfs). Because rootfs can't be moved |
| 334 | or unmounted*, pivot_root will not work from initramfs. Instead, |
| 335 | switch_root deletes everything out of rootfs (including itself), |
| 336 | does a mount --move that overmounts rootfs with the new root, and |
| 337 | then execs the specified init program. |
| 338 | |
| 339 | * Because the Linux kernel uses rootfs internally as the starting |
| 340 | and ending point for searching through the kernel's doubly linked |
| 341 | list of active mount points. That's why. |
| 342 | |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 343 | config CONFIG_RDATE |
| 344 | bool "rdate" |
| 345 | default n |
| 346 | help |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 347 | The rdate utility allows you to synchronize the date and time of your |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 348 | system clock with the date and time of a remote networked system using |
| 349 | the RFC868 protocol, which is built into the inetd daemon on most |
| 350 | systems. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 351 | |
Mike Frysinger | 75aa192 | 2005-09-24 23:12:38 +0000 | [diff] [blame] | 352 | config CONFIG_READPROFILE |
| 353 | bool "readprofile" |
| 354 | default n |
| 355 | help |
| 356 | This allows you to parse /proc/profile for basic profiling. |
| 357 | |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 358 | config CONFIG_SWAPONOFF |
| 359 | bool "swaponoff" |
| 360 | default n |
| 361 | help |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 362 | This option enables both the 'swapon' and the 'swapoff' utilities. |
| 363 | Once you have created some swap space using 'mkswap', you also need |
| 364 | to enable your swap space with the 'swapon' utility. The 'swapoff' |
| 365 | utility is used, typically at system shutdown, to disable any swap |
| 366 | space. If you are not using any swap space, you can leave this |
| 367 | option disabled. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 368 | |
| 369 | config CONFIG_MOUNT |
| 370 | bool "mount" |
| 371 | default n |
| 372 | help |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 373 | All files and filesystems in Unix are arranged into one big directory |
| 374 | tree. The 'mount' utility is used to graft a filesystem onto a |
| 375 | particular part of the tree. A filesystem can either live on a block |
| 376 | device, or it can be accessible over the network, as is the case with |
| 377 | NFS filesystems. Most people using BusyBox will also want to enable |
| 378 | the 'mount' utility. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 379 | |
Rob Landley | 4a7252b | 2005-10-08 18:49:45 +0000 | [diff] [blame] | 380 | config CONFIG_FEATURE_MOUNT_NFS |
Eric Andersen | 88c916b | 2003-10-22 09:58:56 +0000 | [diff] [blame] | 381 | bool " Support mounting NFS file systems" |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 382 | default n |
| 383 | depends on CONFIG_MOUNT |
| 384 | help |
Eric Andersen | e5920a2 | 2003-07-03 10:00:15 +0000 | [diff] [blame] | 385 | Enable mounting of NFS file systems. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 386 | |
| 387 | config CONFIG_UMOUNT |
| 388 | bool "umount" |
| 389 | default n |
| 390 | help |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 391 | When you want to remove a mounted filesystem from its current mount point, |
| 392 | for example when you are shutting down the system, the 'umount' utility is |
| 393 | the tool to use. If you enabled the 'mount' utility, you almost certainly |
| 394 | also want to enable 'umount'. |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 395 | |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 396 | comment "Common options for mount/umount" |
| 397 | depends on CONFIG_MOUNT || CONFIG_UMOUNT |
| 398 | |
| 399 | config CONFIG_FEATURE_MOUNT_LOOP |
Rob Landley | 6a6798b | 2005-08-10 20:35:54 +0000 | [diff] [blame] | 400 | bool " Support loopback mounts" |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 401 | default n |
| 402 | depends on CONFIG_MOUNT || CONFIG_UMOUNT |
| 403 | help |
Rob Landley | 6a6798b | 2005-08-10 20:35:54 +0000 | [diff] [blame] | 404 | Enabling this feature allows automatic mounting of files (containing |
| 405 | filesystem images) via the linux kernel's loopback devices. The mount |
| 406 | command will detect you are trying to mount a file instead of a block |
| 407 | device, and transparently associate the file with a loopback device. |
| 408 | The umount command will also free that loopback device. |
Tim Riker | c1ef7bd | 2006-01-25 00:08:53 +0000 | [diff] [blame] | 409 | |
Rob Landley | 6a6798b | 2005-08-10 20:35:54 +0000 | [diff] [blame] | 410 | You can still use the 'losetup' utility (to manually associate files |
| 411 | with loop devices) if you need to do something advanced, such as |
| 412 | specify an offset or cryptographic options to the loopback device. |
| 413 | (If you don't want umount to free the loop device, use "umount -D".) |
Paul Fox | 3f6f317 | 2005-07-19 20:55:37 +0000 | [diff] [blame] | 414 | |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 415 | config CONFIG_FEATURE_MTAB_SUPPORT |
Rob Landley | 6a6798b | 2005-08-10 20:35:54 +0000 | [diff] [blame] | 416 | bool " Support for the old /etc/mtab file" |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 417 | default n |
| 418 | depends on CONFIG_MOUNT || CONFIG_UMOUNT |
| 419 | help |
Rob Landley | 6a6798b | 2005-08-10 20:35:54 +0000 | [diff] [blame] | 420 | Historically, Unix systems kept track of the currently mounted |
| 421 | partitions in the file "/etc/mtab". These days, the kernel exports |
| 422 | the list of currently mounted partitions in "/proc/mounts", rendering |
| 423 | the old mtab file obsolete. (In modern systems, /etc/mtab should be |
| 424 | a symlink to /proc/mounts.) |
Eric Andersen | a0ac452 | 2003-02-27 03:14:04 +0000 | [diff] [blame] | 425 | |
Rob Landley | 6a6798b | 2005-08-10 20:35:54 +0000 | [diff] [blame] | 426 | The only reason to have mount maintain an /etc/mtab file itself is if |
| 427 | your stripped-down embedded system does not have a /proc directory. |
| 428 | If you must use this, keep in mind it's inherently brittle (for |
| 429 | example a mount under chroot won't update it), can't handle modern |
| 430 | features like separate per-process filesystem namespaces, requires |
| 431 | that your /etc directory be writeable, tends to get easily confused |
| 432 | by --bind or --move mounts, and so on. (In brief: avoid.) |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 433 | |
Eric Andersen | c9f20d9 | 2002-12-05 08:41:41 +0000 | [diff] [blame] | 434 | endmenu |
| 435 | |