menu "System configuration" # Note on package/skeleton: usually, it is not safe to 'select' a # provider of a virtual package. But below we have an exception: each # init system may select one of the virtual skeleton-init-* packages. # As only one init system may be enabled, only one skeleton-init-* may # be selected. So this is a safe situation. choice prompt "Root FS skeleton" config BR2_ROOTFS_SKELETON_DEFAULT bool "default target skeleton" help Use default target skeleton for selected init system. config BR2_ROOTFS_SKELETON_CUSTOM bool "custom target skeleton" select BR2_PACKAGE_SKELETON_CUSTOM help Use custom target skeleton. # skeleton from br2-external trees, if any source "$BR2_BASE_DIR/.br2-external.in.skeleton" endchoice if BR2_ROOTFS_SKELETON_CUSTOM config BR2_ROOTFS_SKELETON_CUSTOM_PATH string "custom target skeleton path" help Path to custom target skeleton. endif if BR2_ROOTFS_SKELETON_DEFAULT config BR2_TARGET_GENERIC_HOSTNAME string "System hostname" default "buildroot" help Select system hostname to be stored in /etc/hostname. Leave empty to not create /etc/hostname, or to keep the one from a custom skeleton. config BR2_TARGET_GENERIC_ISSUE string "System banner" default "Welcome to Buildroot" help Select system banner (/etc/issue) to be displayed at login. Leave empty to not create /etc/issue, or to keep the one from a custom skeleton. endif choice bool "Passwords encoding" default BR2_TARGET_GENERIC_PASSWD_SHA256 help Choose the password encoding scheme to use when Buildroot needs to encode a password (eg. the root password, below). Note: this is used at build-time, and *not* at runtime. config BR2_TARGET_GENERIC_PASSWD_SHA256 bool "sha-256" help Use SHA256 to encode passwords which is stronger than MD5. config BR2_TARGET_GENERIC_PASSWD_SHA512 bool "sha-512" help Use SHA512 to encode passwords which is stronger than SHA256 endchoice # Passwd encoding config BR2_TARGET_GENERIC_PASSWD_METHOD string default "sha-256" if BR2_TARGET_GENERIC_PASSWD_SHA256 default "sha-512" if BR2_TARGET_GENERIC_PASSWD_SHA512 # See comment at the top of the file, about selecting individual # skeletons, which are providers of the virtual skeleton package. choice prompt "Init system" default BR2_INIT_BUSYBOX config BR2_INIT_BUSYBOX bool "BusyBox" select BR2_PACKAGE_BUSYBOX select BR2_PACKAGE_INITSCRIPTS select BR2_PACKAGE_SKELETON_INIT_SYSV if BR2_ROOTFS_SKELETON_DEFAULT config BR2_INIT_SYSV bool "systemV" depends on BR2_USE_MMU # sysvinit select BR2_PACKAGE_BUSYBOX_SHOW_OTHERS # sysvinit select BR2_PACKAGE_INITSCRIPTS select BR2_PACKAGE_SYSVINIT select BR2_PACKAGE_SKELETON_INIT_SYSV if BR2_ROOTFS_SKELETON_DEFAULT config BR2_INIT_OPENRC bool "OpenRC" depends on BR2_USE_MMU depends on !BR2_STATIC_LIBS depends on !BR2_TOOLCHAIN_USES_UCLIBC # openrc select BR2_PACKAGE_OPENRC select BR2_PACKAGE_SKELETON_INIT_OPENRC if BR2_ROOTFS_SKELETON_DEFAULT comment "openrc needs a glibc or musl toolchain w/ dynamic library" depends on BR2_USE_MMU depends on BR2_STATIC_LIBS && BR2_TOOLCHAIN_USES_UCLIBC # In Buildroot, we decided not to support a split-usr when systemd is # used as an init system. This is a design decision, not a systemd # issue. Thus the select is with BR2_INIT_SYSTEMD (below) rather than # with BR2_PACKAGE_SYSTEMD. config BR2_INIT_SYSTEMD bool "systemd" depends on BR2_PACKAGE_SYSTEMD_ARCH_SUPPORTS depends on BR2_USE_MMU depends on !BR2_STATIC_LIBS depends on BR2_TOOLCHAIN_USES_GLIBC depends on BR2_TOOLCHAIN_HAS_SSP depends on BR2_TOOLCHAIN_HAS_THREADS depends on BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_14 depends on BR2_TOOLCHAIN_GCC_AT_LEAST_5 depends on BR2_HOST_GCC_AT_LEAST_5 select BR2_ROOTFS_MERGED_USR select BR2_PACKAGE_SYSTEMD select BR2_PACKAGE_SKELETON_INIT_SYSTEMD if BR2_ROOTFS_SKELETON_DEFAULT comment "systemd needs a glibc toolchain w/ SSP, headers >= 4.14, host and target gcc >= 5" depends on BR2_PACKAGE_SYSTEMD_ARCH_SUPPORTS depends on BR2_USE_MMU depends on !BR2_TOOLCHAIN_USES_GLIBC || \ !BR2_TOOLCHAIN_HAS_SSP || \ !BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_14 || \ !BR2_TOOLCHAIN_GCC_AT_LEAST_5 || \ !BR2_HOST_GCC_AT_LEAST_5 comment "systemd highly recommends Linux >= 4.15" depends on BR2_INIT_SYSTEMD depends on !BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_15 config BR2_INIT_NONE bool "None" select BR2_PACKAGE_SKELETON_INIT_NONE if BR2_ROOTFS_SKELETON_DEFAULT help Buildroot will not install any init system. You will have to provide your own, either with a new package or with a rootfs-overlay. # Init systems from br2-external trees, if any source "$BR2_BASE_DIR/.br2-external.in.init" endchoice if BR2_INIT_SYSTEMD choice bool "/var management" default BR2_INIT_SYSTEMD_VAR_FACTORY # legacy depends on !BR2_TARGET_GENERIC_REMOUNT_ROOTFS_RW help Select how Buildroot provides a read-write /var when the rootfs is not remounted read-write. Note: Buildroot uses a tmpfs, either as a mount point or as the upper of an overlayfs, so as to at least make the system bootable out of the box; mounting a filesystem from actual storage is left to the integration, as it is too specific and may need preparatory work like partitionning a device and/or formatting a filesystem first, which falls out of the scope of Buildroot. config BR2_INIT_SYSTEMD_VAR_FACTORY bool "build a factory to populate a tmpfs" help Build a factory of the content of /var as installed by packages, mount a tmpfs on /var at runtime, so that systemd-tmpfiles can populate it from the factory. This may help on a read-only rootfs. It probably does not play very well with triggering a call to systemd-tmpfiles at build time (below). To use persistent storage, provide a systemd dropin for the var.mount unit, that overrides the What and Type, and possibly the Options and After, fields. config BR2_INIT_SYSTEMD_VAR_OVERLAYFS bool "mount an overlayfs backed by a tmpfs" select BR2_INIT_SYSTEMD_POPULATE_TMPFILES help Mount an overlayfs on /var, with the upper as a tmpfs. To use a persistent storage, provide either a mount unit or a fstab line to mount it on /run/buildroot/mounts/var, e.g. /dev/sdc1 /run/buildroot/mounts/var ext4 defaults config BR2_INIT_SYSTEMD_VAR_NONE bool "do nothing" help Choose this if you have custom dispositions (like one or more of a post-build script, a fakeroot script, systemd units, an initramfs, or something else) that prepare /var to be writable on a read-only rootfs. endchoice config BR2_INIT_SYSTEMD_POPULATE_TMPFILES bool "trigger systemd-tmpfiles during build" default y # legacy help Act on the systemd-tmpfiles.d database at build time, when assembling the root filesystems. This may help on a read-only filesystem. It probably does not play very well with the /var factory (above). config BR2_PACKAGE_SYSTEMD_DEFAULT_TARGET string "The default unit systemd starts at bootup" default "multi-user.target" help Specify the name of the unit configuration file to be started at bootup by systemd. Should end in ".target". ex: multi-user.target https://www.freedesktop.org/software/systemd/man/systemd.special.html#default.target endif # BR2_INIT_SYSTEMD choice prompt "/dev management" if !BR2_INIT_SYSTEMD default BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_DEVTMPFS config BR2_ROOTFS_DEVICE_CREATION_STATIC bool "Static using device table" config BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_DEVTMPFS bool "Dynamic using devtmpfs only" config BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_MDEV bool "Dynamic using devtmpfs + mdev" select BR2_PACKAGE_BUSYBOX config BR2_ROOTFS_DEVICE_CREATION_DYNAMIC_EUDEV bool "Dynamic using devtmpfs + eudev" depends on BR2_USE_WCHAR # eudev depends on !BR2_STATIC_LIBS depends on BR2_USE_MMU # eudev select BR2_PACKAGE_EUDEV comment "eudev needs a toolchain w/ wchar, dynamic library" depends on BR2_USE_MMU depends on !BR2_USE_WCHAR || BR2_STATIC_LIBS endchoice comment "/dev management using udev (from systemd)" depends on BR2_INIT_SYSTEMD config BR2_ROOTFS_DEVICE_TABLE string "Path to the permission tables" default "system/device_table.txt" help Specify a space-separated list of permission table locations, that will be passed to the makedevs utility to assign correct owners and permissions on various files in the target filesystem. See package/makedevs/README for details on the usage and syntax of these files. config BR2_ROOTFS_STATIC_DEVICE_TABLE string "Path to the device tables" default "system/device_table_dev.txt" depends on BR2_ROOTFS_DEVICE_CREATION_STATIC help Specify a space-separated list of device table locations, that will be passed to the makedevs utility to create all the special device files under /dev. See package/makedevs/README for details on the usage and syntax of these files. config BR2_ROOTFS_DEVICE_TABLE_SUPPORTS_EXTENDED_ATTRIBUTES bool "support extended attributes in device tables" help Support extended attributes handling in device tables config BR2_ROOTFS_MERGED_USR bool "Use symlinks to /usr for /bin, /sbin and /lib" help If you say 'n' here, then /bin, /sbin and /lib and their counterparts in /usr will be separate directories. This is the historical UNIX way. In this case, /usr can be a filesystem on a partition separate from / . If you say 'y' here, then /bin, /sbin and /lib will be symlinks to their counterparts in /usr. In this case, /usr can not be a separate filesystem. if BR2_ROOTFS_SKELETON_DEFAULT config BR2_TARGET_ENABLE_ROOT_LOGIN bool "Enable root login with password" default y select BR2_PACKAGE_HOST_MKPASSWD if BR2_TARGET_GENERIC_ROOT_PASSWD != "" help Allow root to log in with a password. If not enabled, root will not be able to log in with a password. However, if you have an ssh server and you add an ssh key, you can still allow root to log in. Alternatively, you can use sudo to become root. config BR2_TARGET_GENERIC_ROOT_PASSWD string "Root password" default "" depends on BR2_TARGET_ENABLE_ROOT_LOGIN help Set the initial root password. If set to empty (the default), then no root password will be set, and root will need no password to log in. If the password starts with any of $1$, $5$ or $6$, it is considered to be already crypt-encoded with respectively md5, sha256 or sha512. Any other value is taken to be a clear-text value, and is crypt-encoded as per the "Passwords encoding" scheme, above. Note: "$" signs in the hashed password must be doubled. For example, if the hashed password is "$1$longsalt$v35DIIeMo4yUfI23yditq0", then you must enter it as "$$1$$longsalt$$v35DIIeMo4yUfI23yditq0" (this is necessary otherwise make would attempt to interpret the $ as a variable expansion). WARNING! WARNING! The password appears as-is in the .config file, and may appear in the build log! Avoid using a valuable password if either the .config file or the build log may be distributed, or at the very least use a strong cryptographic hash for your password! choice bool "/bin/sh" default BR2_SYSTEM_BIN_SH_DASH if !BR2_PACKAGE_BUSYBOX help Select which shell will provide /bin/sh. # busybox has shells that work on noMMU config BR2_SYSTEM_BIN_SH_BUSYBOX bool "busybox' default shell" depends on BR2_PACKAGE_BUSYBOX config BR2_SYSTEM_BIN_SH_BASH bool "bash" depends on BR2_USE_MMU # bash depends on BR2_PACKAGE_BUSYBOX_SHOW_OTHERS select BR2_PACKAGE_BASH config BR2_SYSTEM_BIN_SH_DASH bool "dash" depends on BR2_USE_MMU # dash depends on BR2_PACKAGE_BUSYBOX_SHOW_OTHERS select BR2_PACKAGE_DASH config BR2_SYSTEM_BIN_SH_MKSH bool "mksh" depends on BR2_USE_MMU # mksh depends on BR2_PACKAGE_BUSYBOX_SHOW_OTHERS select BR2_PACKAGE_MKSH config BR2_SYSTEM_BIN_SH_ZSH bool "zsh" depends on BR2_USE_MMU # zsh depends on BR2_PACKAGE_BUSYBOX_SHOW_OTHERS select BR2_PACKAGE_ZSH comment "bash, dash, mksh, zsh need BR2_PACKAGE_BUSYBOX_SHOW_OTHERS" depends on !BR2_PACKAGE_BUSYBOX_SHOW_OTHERS && BR2_PACKAGE_BUSYBOX config BR2_SYSTEM_BIN_SH_NONE bool "none" endchoice # /bin/sh config BR2_SYSTEM_BIN_SH string default "bash" if BR2_SYSTEM_BIN_SH_BASH default "dash" if BR2_SYSTEM_BIN_SH_DASH default "mksh" if BR2_SYSTEM_BIN_SH_MKSH default "zsh" if BR2_SYSTEM_BIN_SH_ZSH menuconfig BR2_TARGET_GENERIC_GETTY bool "Run a getty (login prompt) after boot" default y if !BR2_PACKAGE_PETITBOOT if BR2_TARGET_GENERIC_GETTY config BR2_TARGET_GENERIC_GETTY_PORT string "TTY port" default "console" help Specify a port to run a getty on. choice prompt "Baudrate" default BR2_TARGET_GENERIC_GETTY_BAUDRATE_KEEP help Select a baudrate to use. config BR2_TARGET_GENERIC_GETTY_BAUDRATE_KEEP bool "keep kernel default" config BR2_TARGET_GENERIC_GETTY_BAUDRATE_9600 bool "9600" config BR2_TARGET_GENERIC_GETTY_BAUDRATE_19200 bool "19200" config BR2_TARGET_GENERIC_GETTY_BAUDRATE_38400 bool "38400" config BR2_TARGET_GENERIC_GETTY_BAUDRATE_57600 bool "57600" config BR2_TARGET_GENERIC_GETTY_BAUDRATE_115200 bool "115200" endchoice config BR2_TARGET_GENERIC_GETTY_BAUDRATE string default "0" if BR2_TARGET_GENERIC_GETTY_BAUDRATE_KEEP default "9600" if BR2_TARGET_GENERIC_GETTY_BAUDRATE_9600 default "19200" if BR2_TARGET_GENERIC_GETTY_BAUDRATE_19200 default "38400" if BR2_TARGET_GENERIC_GETTY_BAUDRATE_38400 default "57600" if BR2_TARGET_GENERIC_GETTY_BAUDRATE_57600 default "115200" if BR2_TARGET_GENERIC_GETTY_BAUDRATE_115200 config BR2_TARGET_GENERIC_GETTY_TERM string "TERM environment variable" default "vt100" # currently observed by all but systemd depends on !BR2_INIT_SYSTEMD help Specify a TERM type. config BR2_TARGET_GENERIC_GETTY_OPTIONS string "other options to pass to getty" default "" # currently observed by all but systemd depends on !BR2_INIT_SYSTEMD help Any other flags you want to pass to getty, Refer to getty --help for details. endif config BR2_TARGET_GENERIC_REMOUNT_ROOTFS_RW bool "remount root filesystem read-write during boot" default y help The root filesystem is typically mounted read-only at boot. By default, buildroot remounts it in read-write mode early during the boot process. Say no here if you would rather like your root filesystem to remain read-only. If unsure, say Y. config BR2_SYSTEM_DHCP string "Network interface to configure through DHCP" default "" depends on BR2_PACKAGE_BUSYBOX || BR2_PACKAGE_IFUPDOWN || \ BR2_PACKAGE_SYSTEMD_NETWORKD || BR2_PACKAGE_NETIFRC help Enter here the name of the network interface (E.G. eth0) to automatically configure through DHCP at bootup. If left empty, no automatic DHCP requests will take place. For more complicated network setups use an overlay to overwrite /etc/network/interfaces or add a networkd configuration file. comment "automatic network configuration via DHCP needs ifupdown or busybox or networkd or netifrc" depends on !(BR2_PACKAGE_BUSYBOX || BR2_PACKAGE_IFUPDOWN || \ BR2_PACKAGE_SYSTEMD_NETWORKD || BR2_PACKAGE_NETIFRC) endif # BR2_ROOTFS_SKELETON_DEFAULT config BR2_SYSTEM_DEFAULT_PATH string "Set the system's default PATH" default "/usr/bin:/usr/sbin" if BR2_ROOTFS_MERGED_USR default "/bin:/sbin:/usr/bin:/usr/sbin" if !BR2_ROOTFS_MERGED_USR help Sets the system's default PATH. It is being used in /etc/profile in the skeleton-init-common package and by some daemons. The default should work in most cases. config BR2_ENABLE_LOCALE_PURGE bool "Purge unwanted locales" default y help Explicitly specify what locales to install on target. If N then all locales supported by packages are installed. config BR2_ENABLE_LOCALE_WHITELIST string "Locales to keep" default "C en_US" depends on BR2_ENABLE_LOCALE_PURGE help Whitespace separated list of locales to allow on target. Locales not listed here will be removed from the target. See 'locale -a' on your host for a list of locales available on your build host, or have a look in /usr/share/locale in the target file system for available locales. Notice that listing a locale here doesn't guarantee that it will be available on the target - That purely depends on the support for that locale in the selected packages. config BR2_GENERATE_LOCALE string "Generate locale data" default "" depends on \ (BR2_TOOLCHAIN_BUILDROOT_UCLIBC && BR2_ENABLE_LOCALE) || \ BR2_TOOLCHAIN_USES_GLIBC help Generate support for a list of locales. Locales can be specified with or without encoding, when no encoding is specified, UTF-8 is assumed. Examples of locales: en_US, fr_FR.UTF-8. config BR2_SYSTEM_ENABLE_NLS bool "Enable Native Language Support (NLS)" depends on BR2_USE_WCHAR # - glibc has built-in NLS support, but anyway doesn't # support static linking # - musl and uclibc support static linking, but they don't # have built-in NLS support, which is provided by the # libintl library from gettext. The fact that it is a # separate library causes too many problems for static # linking. depends on !BR2_STATIC_LIBS select BR2_PACKAGE_GETTEXT if !BR2_TOOLCHAIN_HAS_FULL_GETTEXT help This option will enable Native Language Support, which will allow software packages to support translations. comment "NLS support needs a toolchain w/ wchar, dynamic library" depends on !BR2_USE_WCHAR || BR2_STATIC_LIBS config BR2_TARGET_TZ_INFO bool "Install timezone info" select BR2_PACKAGE_TZDATA if BR2_TOOLCHAIN_USES_GLIBC select BR2_PACKAGE_TZDATA if BR2_TOOLCHAIN_USES_MUSL select BR2_PACKAGE_TZ if BR2_TOOLCHAIN_USES_UCLIBC help Say 'y' here to install timezone info. if BR2_TARGET_TZ_INFO config BR2_TARGET_TZ_ZONELIST string "timezone list" default "default" help Space-separated list of time zones to compile. The value "default" includes all commonly used time zones. Note that this set consumes around 5.5M for glibc and 2.1M for uClibc. The full list is the list of files in the time zone database source, not including the build and .tab files. config BR2_TARGET_LOCALTIME string "default local time" default "Etc/UTC" help The time zone to install as the default local time, expressed as a tzdata location, such as: Etc/UTC (the default) GMT Europe/Paris America/New_York Pacific/Wallis ... Set to empty to not install a default time zone. endif # BR2_TARGET_TZ_INFO config BR2_ROOTFS_USERS_TABLES string "Path to the users tables" help Specify a space-separated list of users table locations, that will be passed to the mkusers utility to create users on the system, with home directory, password, etc. See manual for details on the usage and syntax of these files. config BR2_ROOTFS_OVERLAY string "Root filesystem overlay directories" default "" help Specify a list of directories that are copied over the target root filesystem after the build has finished and before it is packed into the selected filesystem images. They are copied as-is into the rootfs, excluding files ending with ~ and .git, .svn and .hg directories. config BR2_ROOTFS_PRE_BUILD_SCRIPT string "Custom scripts to run before commencing the build" default "" help Specify a space-separated list of scripts to be run before the build commences. This gives users the opportunity to do board-specific preparations before starting the build. config BR2_ROOTFS_POST_BUILD_SCRIPT string "Custom scripts to run before creating filesystem images" default "" help Specify a space-separated list of scripts to be run after the build has finished and before Buildroot starts packing the files into selected filesystem images. This gives users the opportunity to do board-specific cleanups, add-ons and the like, so the generated files can be used directly without further processing. These scripts are called with the target directory name as first argument. Make sure the exit code of those scripts are 0, otherwise make will stop after calling them. config BR2_ROOTFS_POST_FAKEROOT_SCRIPT string "Custom scripts to run inside the fakeroot environment" default "" help Specify a space-separated list of scripts to be run at the end of the fakeroot script right before the image(s) are actually generated. This gives users the opportunity to do customisations of the content of the rootfs, which would otherwise require root rights. These scripts are called with the target directory name as first argument. The build will fail on the first scripts that exits with a non-zero exit code. Note that Buildroot already provides mechanisms to customise the content of the rootfs: - BR2_ROOTFS_STATIC_DEVICE_TABLE to create arbitrary entries statically in /dev - BR2_ROOTFS_DEVICE_TABLE to set arbitrary permissions as well as extended attributes (such as capabilities) on files and directories, - BR2_ROOTFS_USERS_TABLES: to create arbitrary users and their home directories It is highly recommended to use those mechanisms if possible, rather than using custom fakeroot scripts. config BR2_ROOTFS_POST_IMAGE_SCRIPT string "Custom scripts to run after creating filesystem images" default "" help Specify a space-separated list of scripts to be run after the build has finished and after Buildroot has packed the files into selected filesystem images. This can for example be used to call a tool building a firmware image from different images generated by Buildroot, or automatically extract the tarball root filesystem image into some location exported by NFS, or any other custom action. These scripts are called with the images directory name as first argument. The script is executed from the main Buildroot source directory as the current directory. config BR2_ROOTFS_POST_SCRIPT_ARGS string "Extra arguments passed to custom scripts" depends on BR2_ROOTFS_POST_BUILD_SCRIPT != "" \ || BR2_ROOTFS_POST_FAKEROOT_SCRIPT != "" \ || BR2_ROOTFS_POST_IMAGE_SCRIPT != "" help Pass these additional arguments to each post-build or post-image scripts. Note that all the post-build and post-image scripts will be passed the same set of arguments, you can not pass different arguments to each script. Note also, as stated in their respective help text, that the first argument to each post-build or post-image script is the target directory / images directory. The arguments in this option will be passed *after* those. endmenu