1 # Copyright (C) 2006-2012 OpenWrt.org
3 # This is free software, licensed under the GNU General Public License v2.
4 # See /LICENSE for more information.
7 mainmenu "OpenWrt Configuration"
13 config HAVE_DOT_CONFIG
17 source "target/Config.in"
21 menuconfig TARGET_ROOTFS_INITRAMFS
23 default y if USES_INITRAMFS
25 Embed the rootfs into the kernel (initramfs)
29 default TARGET_INITRAMFS_COMPRESSION_LZMA if TARGET_ar71xx
30 default TARGET_INITRAMFS_COMPRESSION_LZMA if TARGET_ramips
31 default TARGET_INITRAMFS_COMPRESSION_NONE
32 depends on TARGET_ROOTFS_INITRAMFS
34 Select ramdisk compression.
36 config TARGET_INITRAMFS_COMPRESSION_NONE
39 config TARGET_INITRAMFS_COMPRESSION_GZIP
42 config TARGET_INITRAMFS_COMPRESSION_BZIP2
45 config TARGET_INITRAMFS_COMPRESSION_LZMA
48 config TARGET_INITRAMFS_COMPRESSION_LZO
51 config TARGET_INITRAMFS_COMPRESSION_XZ
57 prompt "Use external cpio" if TARGET_ROOTFS_INITRAMFS
60 Kernel uses specified external cpio as INITRAMFS_SOURCE
62 comment "Root filesystem archives"
64 config TARGET_ROOTFS_CPIOGZ
66 default y if USES_CPIOGZ
68 Build a compressed cpio archive of the the root filesystem
70 config TARGET_ROOTFS_TARGZ
72 default y if USES_TARGZ
74 Build a compressed tar archive of the the root filesystem
76 comment "Root filesystem images"
78 config TARGET_ROOTFS_EXT4FS
80 default y if USES_EXT4
82 Ext4 file system with some free space for uml images
84 config TARGET_ROOTFS_ISO
87 depends on TARGET_x86_generic
89 Create some bootable ISO image
91 config TARGET_ROOTFS_JFFS2
93 default y if USES_JFFS2
95 Build a jffs2 root filesystem
97 config TARGET_ROOTFS_JFFS2_NAND
99 default y if USES_JFFS2_NAND
100 depends on USES_JFFS2_NAND
102 Build a jffs2 root filesystem for NAND flash
104 config TARGET_ROOTFS_SQUASHFS
106 default y if USES_SQUASHFS
108 Build a squashfs-lzma root filesystem
110 menuconfig TARGET_ROOTFS_UBIFS
112 default y if USES_UBIFS
113 depends on USES_UBIFS
115 Build a ubifs root filesystem
119 default TARGET_UBIFS_COMPRESSION_NONE
120 depends on TARGET_ROOTFS_UBIFS
122 Select compression type
124 config TARGET_UBIFS_COMPRESSION_NONE
127 config TARGET_UBIFS_COMPRESSION_LZO
130 config TARGET_UBIFS_COMPRESSION_ZLIB
134 config TARGET_UBIFS_FREE_SPACE_FIXUP
135 bool "free space fixup" if TARGET_ROOTFS_UBIFS
138 The file-system free space has to be fixed up on first mount
140 config TARGET_UBIFS_JOURNAL_SIZE
142 prompt "journal size" if TARGET_ROOTFS_UBIFS
145 config TARGET_UBIFS_SQUASH_UIDS
146 bool "squash uids" if TARGET_ROOTFS_UBIFS
149 Squash owners making all files owned by root
151 comment "Image Options"
153 source "target/linux/*/image/Config.in"
155 config TARGET_ROOTFS_PARTSIZE
156 int "Root filesystem partition size (in MB)"
157 depends on X86_GRUB_IMAGES || TARGET_ROOTFS_EXT4FS || TARGET_rb532
160 Allows you to change the root filesystem partition size
162 config TARGET_ROOTFS_MAXINODE
163 int "Maximum number of inodes in root filesystem"
164 depends on TARGET_ROOTFS_EXT4FS
167 Allows you to change the maximum number of inodes in the root filesystem
169 config TARGET_ROOTFS_RESERVED_PCT
170 int "Percentage of reserved blocks in root filesystem"
171 depends on TARGET_ROOTFS_EXT4FS
174 Allows you to change the percentage of reserved blocks in the root filesystem
176 config TARGET_ROOTFS_INCLUDE_KERNEL
177 bool "Include kernel in root filesystem"
178 depends on TARGET_ROOTFS_UBIFS || TARGET_ROOTFS_EXT4FS
179 default n if USES_UBIFS
181 Include the kernel image in the rootfs. Typically the image is placed
184 config TARGET_ROOTFS_INCLUDE_DTB
185 bool "Include DTB in root filesystem"
186 depends on TARGET_ROOTFS_UBIFS || TARGET_ROOTFS_EXT4FS
187 default n if USES_UBIFS
189 Include the device tree blob file(s) in the rootfs. Typically the DTBs
190 are placed below /boot.
194 config TARGET_IMAGE_FIT
195 bool "FIT image with kernel and DTB"
196 default y if USES_FIT
199 Create a u-boot FIT image containing kernel and DTB
203 menu "Global build settings"
206 bool "Select all packages by default"
209 comment "General build options"
211 config DISPLAY_SUPPORT
212 bool "Show packages that require graphics support (local or remote)"
215 config BUILD_PATENTED
217 bool "Compile with support for patented functionality"
219 When this option is disabled, software which provides patented functionality will not be built.
220 In case software provides optional support for patented functionality,
221 this optional support will get disabled for this package.
225 bool "Compile with full language support"
227 When this option is enabled, packages are built with the full versions of iconv and GNU gettext
228 instead of the default OpenWrt stubs. If uClibc is used, it is also built with locale support.
230 config BUILD_STATIC_TOOLS
232 bool "Attempt to link host utilities statically"
234 Linking host utilities like sed or firmware-utils statically increases the portability of the
235 generated ImageBuilder and SDK tarballs, however it may fail on some Linux distributions.
237 config SHADOW_PASSWORDS
239 prompt "Enable shadow password support"
242 Enable shadow password support.
246 prompt "Remove ipkg/opkg status data files in final images"
249 This removes all ipkg/opkg status data files from the target directory before building the root fs
251 config COLLECT_KERNEL_DEBUG
253 prompt "Collect kernel debug information"
254 select KERNEL_DEBUG_INFO
257 This collects debugging symbols from the kernel and all compiled modules.
258 Useful for release builds, so that kernel issues can be debugged offline later.
260 comment "Kernel build options"
262 config KERNEL_DEBUG_FS
263 bool "Compile the kernel with Debug FileSystem enabled"
266 debugfs is a virtual file system that kernel developers use to put
267 debugging files into. Enable this option to be able to read and
268 write to these files.
270 config KERNEL_PERF_EVENTS
274 config KERNEL_PROFILING
275 bool "Compile the kernel with profiling enabled"
277 select KERNEL_PERF_EVENTS
279 Enable the extended profiling support mechanisms used by profilers such
282 config KERNEL_KALLSYMS
283 bool "Compile the kernel with symbol table information"
286 This will give you more information in stack traces from kernel oopses
289 bool "Compile the kernel with tracing support"
292 config KERNEL_FTRACE_SYSCALLS
293 bool "Trace system calls"
294 depends on KERNEL_FTRACE
297 config KERNEL_ENABLE_DEFAULT_TRACERS
298 bool "Trace process context switches and events"
299 depends on KERNEL_FTRACE
302 config KERNEL_DEBUG_KERNEL
306 config KERNEL_DEBUG_INFO
307 bool "Compile the kernel with debug information"
309 select KERNEL_DEBUG_KERNEL
311 This will compile your kernel and modules with debug information.
313 config KERNEL_DEBUG_LL_UART_NONE
318 config KERNEL_DEBUG_LL
322 select KERNEL_DEBUG_LL_UART_NONE
324 ARM low level debugging
326 config KERNEL_EARLY_PRINTK
327 bool "Compile the kernel with early printk"
330 select KERNEL_DEBUG_KERNEL
331 select KERNEL_DEBUG_LL if arm
333 Compile the kernel with early printk support.
334 This is only useful for debugging purposes to send messages
335 over the serial console in early boot.
336 Enable this to debug early boot problems.
339 bool "Compile the kernel with asynchronous IO support"
342 config KERNEL_DIRECT_IO
343 bool "Compile the kernel with direct IO support"
346 config KERNEL_MAGIC_SYSRQ
347 bool "Compile the kernel with SysRq support"
350 config KERNEL_COREDUMP
353 config KERNEL_ELF_CORE
354 bool "Enable process core dump support"
355 select KERNEL_COREDUMP
358 config KERNEL_PROVE_LOCKING
359 bool "Enable kernel lock checking"
360 select KERNEL_DEBUG_KERNEL
363 config KERNEL_PRINTK_TIME
364 bool "Enable printk timestamps"
371 bool "Enable kexec support"
374 bool "Enable rfkill support"
375 default RFKILL_SUPPORT
378 # CGROUP support symbols
381 config KERNEL_CGROUPS
382 bool "Enable kernel cgroups"
387 config KERNEL_CGROUP_DEBUG
388 bool "Example debug cgroup subsystem"
391 This option enables a simple cgroup subsystem that
392 exports useful debugging information about the cgroups
395 config KERNEL_FREEZER
397 default y if KERNEL_CGROUP_FREEZER
399 config KERNEL_CGROUP_FREEZER
400 bool "Freezer cgroup subsystem"
403 Provides a way to freeze and unfreeze all tasks in a
406 config KERNEL_CGROUP_DEVICE
407 bool "Device controller for cgroups"
410 Provides a cgroup implementing whitelists for devices which
411 a process in the cgroup can mknod or open.
413 config KERNEL_CPUSETS
414 bool "Cpuset support"
417 This option will let you create and manage CPUSETs which
418 allow dynamically partitioning a system into sets of CPUs and
419 Memory Nodes and assigning tasks to run only within those sets.
420 This is primarily useful on large SMP or NUMA systems.
422 config KERNEL_PROC_PID_CPUSET
423 bool "Include legacy /proc/<pid>/cpuset file"
425 depends on KERNEL_CPUSETS
427 config KERNEL_CGROUP_CPUACCT
428 bool "Simple CPU accounting cgroup subsystem"
431 Provides a simple Resource Controller for monitoring the
432 total CPU consumed by the tasks in a cgroup.
434 config KERNEL_RESOURCE_COUNTERS
435 bool "Resource counters"
438 This option enables controller independent resource accounting
439 infrastructure that works with cgroups.
441 config KERNEL_MM_OWNER
443 default y if KERNEL_MEMCG
446 bool "Memory Resource Controller for Control Groups"
448 depends on KERNEL_RESOURCE_COUNTERS
450 Provides a memory resource controller that manages both anonymous
451 memory and page cache. (See Documentation/cgroups/memory.txt)
453 Note that setting this option increases fixed memory overhead
454 associated with each page of memory in the system. By this,
455 20(40)bytes/PAGE_SIZE on 32(64)bit system will be occupied by memory
456 usage tracking struct at boot. Total amount of this is printed out
459 Only enable when you're ok with these trade offs and really
460 sure you need the memory resource controller. Even when you enable
461 this, you can set "cgroup_disable=memory" at your boot option to
462 disable memory resource controller and you can avoid overheads.
463 (and lose benefits of memory resource controller)
465 This config option also selects MM_OWNER config option, which
466 could in turn add some fork/exit overhead.
468 config KERNEL_MEMCG_SWAP
469 bool "Memory Resource Controller Swap Extension"
471 depends on KERNEL_MEMCG
473 Add swap management feature to memory resource controller. When you
474 enable this, you can limit mem+swap usage per cgroup. In other words,
475 when you disable this, memory resource controller has no cares to
476 usage of swap...a process can exhaust all of the swap. This extension
477 is useful when you want to avoid exhaustion swap but this itself
478 adds more overheads and consumes memory for remembering information.
479 Especially if you use 32bit system or small memory system, please
480 be careful about enabling this. When memory resource controller
481 is disabled by boot option, this will be automatically disabled and
482 there will be no overhead from this. Even when you set this config=y,
483 if boot option "swapaccount=0" is set, swap will not be accounted.
484 Now, memory usage of swap_cgroup is 2 bytes per entry. If swap page
485 size is 4096bytes, 512k per 1Gbytes of swap.
487 config KERNEL_MEMCG_SWAP_ENABLED
488 bool "Memory Resource Controller Swap Extension enabled by default"
490 depends on KERNEL_MEMCG_SWAP
492 Memory Resource Controller Swap Extension comes with its price in
493 a bigger memory consumption. General purpose distribution kernels
494 which want to enable the feature but keep it disabled by default
495 and let the user enable it by swapaccount boot command line
496 parameter should have this option unselected.
497 For those who want to have the feature enabled by default should
498 select this option (if, for some reason, they need to disable it
499 then swapaccount=0 does the trick).
502 config KERNEL_MEMCG_KMEM
503 bool "Memory Resource Controller Kernel Memory accounting (EXPERIMENTAL)"
505 depends on KERNEL_MEMCG
507 The Kernel Memory extension for Memory Resource Controller can limit
508 the amount of memory used by kernel objects in the system. Those are
509 fundamentally different from the entities handled by the standard
510 Memory Controller, which are page-based, and can be swapped. Users of
511 the kmem extension can use it to guarantee that no group of processes
512 will ever exhaust kernel resources alone.
514 config KERNEL_CGROUP_PERF
515 bool "Enable perf_event per-cpu per-container group (cgroup) monitoring"
517 select KERNEL_PERF_EVENTS
519 This option extends the per-cpu mode to restrict monitoring to
520 threads which belong to the cgroup specified and run on the
523 menuconfig KERNEL_CGROUP_SCHED
524 bool "Group CPU scheduler"
527 This feature lets CPU scheduler recognize task groups and control CPU
528 bandwidth allocation to such task groups. It uses cgroups to group
531 if KERNEL_CGROUP_SCHED
533 config KERNEL_FAIR_GROUP_SCHED
534 bool "Group scheduling for SCHED_OTHER"
537 config KERNEL_CFS_BANDWIDTH
538 bool "CPU bandwidth provisioning for FAIR_GROUP_SCHED"
540 depends on KERNEL_FAIR_GROUP_SCHED
542 This option allows users to define CPU bandwidth rates (limits) for
543 tasks running within the fair group scheduler. Groups with no limit
544 set are considered to be unconstrained and will run with no
546 See tip/Documentation/scheduler/sched-bwc.txt for more information.
548 config KERNEL_RT_GROUP_SCHED
549 bool "Group scheduling for SCHED_RR/FIFO"
552 This feature lets you explicitly allocate real CPU bandwidth
553 to task groups. If enabled, it will also make it impossible to
554 schedule realtime tasks for non-root users until you allocate
555 realtime bandwidth for them.
559 config KERNEL_BLK_CGROUP
560 bool "Block IO controller"
563 Generic block IO controller cgroup interface. This is the common
564 cgroup interface which should be used by various IO controlling
567 Currently, CFQ IO scheduler uses it to recognize task groups and
568 control disk bandwidth allocation (proportional time slice allocation)
569 to such task groups. It is also used by bio throttling logic in
570 block layer to implement upper limit in IO rates on a device.
572 This option only enables generic Block IO controller infrastructure.
573 One needs to also enable actual IO controlling logic/policy. For
574 enabling proportional weight division of disk bandwidth in CFQ, set
575 CONFIG_CFQ_GROUP_IOSCHED=y; for enabling throttling policy, set
576 CONFIG_BLK_DEV_THROTTLING=y.
578 config KERNEL_DEBUG_BLK_CGROUP
579 bool "Enable Block IO controller debugging"
581 depends on KERNEL_BLK_CGROUP
583 Enable some debugging help. Currently it exports additional stat
584 files in a cgroup which can be useful for debugging.
586 config KERNEL_NET_CLS_CGROUP
587 bool "Control Group Classifier"
590 config KERNEL_NETPRIO_CGROUP
591 bool "Network priority cgroup"
597 # Namespace support symbols
600 config KERNEL_NAMESPACES
601 bool "Enable kernel namespaces"
610 In this namespace tasks see different info provided
611 with the uname() system call
617 In this namespace tasks work with IPC ids which correspond to
618 different IPC objects in different namespaces.
620 config KERNEL_USER_NS
621 bool "User namespace (EXPERIMENTAL)"
624 This allows containers, i.e. vservers, to use user namespaces
625 to provide different user info for different servers.
628 bool "PID Namespaces"
631 Support process id namespaces. This allows having multiple
632 processes with the same pid as long as they are in different
633 pid namespaces. This is a building block of containers.
636 bool "Network namespace"
639 Allow user space to create what appear to be multiple instances
640 of the network stack.
645 # LXC related symbols
648 config KERNEL_LXC_MISC
649 bool "Enable miscellaneous LXC related options"
654 config KERNEL_DEVPTS_MULTIPLE_INSTANCES
655 bool "Support multiple instances of devpts"
658 Enable support for multiple instances of devpts filesystem.
659 If you want to have isolated PTY namespaces (eg: in containers),
660 say Y here. Otherwise, say N. If enabled, each mount of devpts
661 filesystem with the '-o newinstance' option will create an
662 independent PTY namespace.
664 config KERNEL_POSIX_MQUEUE
665 bool "POSIX Message Queues"
668 POSIX variant of message queues is a part of IPC. In POSIX message
669 queues every message has a priority which decides about succession
670 of receiving it by a process. If you want to compile and run
671 programs written e.g. for Solaris with use of its POSIX message
672 queues (functions mq_*) say Y here.
674 POSIX message queues are visible as a filesystem called 'mqueue'
675 and can be mounted somewhere if you want to do filesystem
676 operations on message queues.
680 comment "Package build options"
684 prompt "Compile packages with debugging info"
687 Adds -g3 to the CFLAGS
691 prompt "Enable IPv6 support in packages"
694 Enable IPV6 support in packages (passes --enable-ipv6 to configure scripts).
696 config PKG_BUILD_PARALLEL
698 prompt "Compile certain packages parallelized"
701 This adds a -jX option to certain packages that are known to
702 behave well for parallel build. By default the package make processes
703 use the main jobserver, in which case this option only takes effect
704 when you add -jX to the make command.
706 If you are unsure, select N.
708 config PKG_BUILD_USE_JOBSERVER
710 prompt "Use top-level make jobserver for packages"
711 depends on PKG_BUILD_PARALLEL
714 This passes the main make process jobserver fds to package builds,
715 enabling full parallelization across different packages
717 Note that disabling this may overcommit CPU resources depending on the
718 -j level of the main make process, the number of package
719 submake jobs selected below and the number of actual CPUs present.
720 Example: If the main make is passed a -j4 and the submake -j
721 is also set to 4, we may end up with 16 parallel make processes
725 config PKG_BUILD_JOBS
727 prompt "Number of package submake jobs (2-512)"
730 depends on PKG_BUILD_PARALLEL && !PKG_BUILD_USE_JOBSERVER
732 The number of jobs (-jX) to pass to packages submake.
734 config PKG_DEFAULT_PARALLEL
736 prompt "Parallelize the default package build rule (May break build)"
737 depends on PKG_BUILD_PARALLEL
741 Always set the default package build rules to parallel build.
743 WARNING: This may break build or kill your cat, as it builds
744 packages with multiple jobs that are probably not tested in
745 a parallel build environment.
747 Only say Y, if you don't mind fixing broken packages.
748 Before reporting build bugs, set this to N and re-run the build.
750 comment "Stripping options"
753 prompt "Binary stripping method"
754 default USE_STRIP if EXTERNAL_TOOLCHAIN
755 default USE_STRIP if USE_GLIBC || USE_EGLIBC || USE_MUSL
758 Select the binary stripping method you wish to use.
763 This will install unstripped binaries (useful for native compiling/debugging)
768 This will install binaries stripped using strip from binutils
774 depends on !USE_GLIBC
775 depends on !USE_EGLIBC
777 This will install binaries stripped using sstrip
782 prompt "Strip arguments"
784 default "--strip-unneeded --remove-section=.comment --remove-section=.note" if DEBUG
785 default "--strip-all"
787 Specifies arguments passed to the strip command when stripping binaries
789 config STRIP_KERNEL_EXPORTS
790 bool "Strip unnecessary exports from the kernel image"
792 Reduces kernel size by stripping unused kernel exports from the kernel image
793 Note that this might make the kernel incompatible with any kernel modules that
794 were not selected at the time the kernel image was created
797 bool "Strip unnecessary functions from libraries"
799 Reduces libraries to only those functions that are necessary for using all
800 selected packages (including those selected as <M>)
801 Note that this will make the system libraries incompatible with most of the packages
802 that are not selected during the build process
805 prompt "Preferred standard C++ library"
806 default USE_LIBSTDCXX if USE_EGLIBC
809 Select the preferred standard C++ library for all packages that support this.
821 bool "Advanced configuration options (for developers)"
825 bool "Show broken platforms / packages" if DEVEL
828 config DOWNLOAD_FOLDER
829 string "Download folder" if DEVEL
833 string "Local mirror for source packages" if DEVEL
837 bool "Automatic rebuild of packages" if DEVEL
840 Automatically rebuild packages when their files change
843 string "Build suffix to append to the BUILD_DIR variable" if DEVEL
846 Build suffix to append to the BUILD_DIR variable, i.e: build_dir_suffix
848 config TARGET_ROOTFS_DIR
849 string "Override the default TARGET_ROOTFS_DIR variable" if DEVEL
852 Override the default TARGET_ROOTFS_DIR variable content $(BUILD_DIR) with custom path.
853 Use this option to re-define the location of the target root file system directory.
856 bool "Use ccache" if DEVEL
859 Compiler cache; see http://ccache.samba.org/
861 config EXTERNAL_KERNEL_TREE
862 string "Use external kernel tree" if DEVEL
865 config KERNEL_GIT_CLONE_URI
866 string "Enter git repository to clone" if DEVEL
869 Enter the full git repository path i.e.:
870 git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
871 This will create a git clone of the kernel in your build
874 config KERNEL_GIT_LOCAL_REPOSITORY
875 string "Enter path to local reference repository" if DEVEL
878 Enter a full pathname to a local reference git repository.
879 In this instance, the --refererence option of git clone will
880 be used thus creating a quick local clone of your repo.
883 bool "Enable log files during build process" if DEVEL
885 If enabled log files will be written to the ./log directory
887 config SRC_TREE_OVERRIDE
888 bool "Enable package source tree override" if DEVEL
890 If enabled, you can force a package to use a git tree as source
891 code instead of the normal tarball. Create a symlink 'git-src'
892 in the package directory, pointing to the .git tree that you want
893 to pull the source code from
895 config EXTRA_OPTIMIZATION
896 string "Additional compiler options" if DEVEL
897 default "-fno-caller-saves"
899 Extra Target-independent optimizations to use when building for the target.
901 menuconfig TARGET_OPTIONS
902 bool "Target Options" if DEVEL
904 config TARGET_OPTIMIZATION
905 string "Target Optimizations" if TARGET_OPTIONS
906 default DEFAULT_TARGET_OPTIMIZATION
908 Optimizations to use when building for the target host.
911 bool "Use software floating point by default" if TARGET_OPTIONS
913 depends on (arm || armeb || powerpc || mipsel || mips || mips64el || mips64) && !HAS_FPU
915 If your target CPU does not have a Floating Point Unit (FPU) or a
916 kernel FPU emulator, but you still wish to support floating point
917 functions, then everything will need to be compiled with soft floating
918 point support (-msoft-float).
920 Most people will answer N.
923 bool "Build packages with MIPS16 instructions" if TARGET_OPTIONS
924 depends on HAS_MIPS16
925 depends on !GCC_VERSION_4_6
928 If your target CPU does support the MIPS16 instruction set
929 and you want to use it for packages, enable this option.
930 MIPS16 produces smaller binaries thus reducing pressure on
933 Most people will answer N.
935 source "toolchain/Config.in"
937 source "target/imagebuilder/Config.in"
938 source "target/sdk/Config.in"
939 source "target/toolchain/Config.in"
941 source "tmp/.config-package.in"