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
81 depends on !TARGET_ROOTFS_INITRAMFS
83 Ext4 file system with some free space for uml images
85 config TARGET_ROOTFS_ISO
88 depends on TARGET_x86_generic
89 depends on !TARGET_ROOTFS_INITRAMFS
91 Create some bootable ISO image
93 config TARGET_ROOTFS_JFFS2
95 default y if USES_JFFS2
96 depends on !TARGET_ROOTFS_INITRAMFS
98 Build a jffs2 root filesystem
100 config TARGET_ROOTFS_SQUASHFS
102 default y if USES_SQUASHFS
103 depends on !TARGET_ROOTFS_INITRAMFS
105 Build a squashfs-lzma root filesystem
107 config TARGET_ROOTFS_UBIFS
109 default y if USES_UBIFS
110 depends on !TARGET_ROOTFS_INITRAMFS && USES_UBIFS
112 Build a ubifs root filesystem
114 comment "Image Options"
116 source "target/linux/*/image/Config.in"
118 config TARGET_ROOTFS_PARTSIZE
119 int "Root filesystem partition size (in MB)"
120 depends on X86_GRUB_IMAGES || TARGET_ROOTFS_EXT4FS || TARGET_rb532
123 Allows you to change the root filesystem partition size
125 config TARGET_ROOTFS_MAXINODE
126 int "Maximum number of inodes in root filesystem"
127 depends on TARGET_ROOTFS_EXT4FS
130 Allows you to change the maximum number of inodes in the root filesystem
132 config TARGET_ROOTFS_RESERVED_PCT
133 int "Percentage of reserved blocks in root filesystem"
134 depends on TARGET_ROOTFS_EXT4FS
137 Allows you to change the percentage of reserved blocks in the root filesystem
141 menu "Global build settings"
144 bool "Select all packages by default"
147 comment "General build options"
149 config DISPLAY_SUPPORT
150 bool "Show packages that require graphics support (local or remote)"
153 config BUILD_PATENTED
155 bool "Compile with support for patented functionality"
157 When this option is disabled, software which provides patented functionality will not be built.
158 In case software provides optional support for patented functionality,
159 this optional support will get disabled for this package.
163 bool "Compile with full language support"
165 When this option is enabled, packages are built with the full versions of iconv and GNU gettext
166 instead of the default OpenWrt stubs. If uClibc is used, it is also built with locale support.
168 config BUILD_STATIC_TOOLS
170 bool "Attempt to link host utilities statically"
172 Linking host utilities like sed or firmware-utils statically increases the portability of the
173 generated ImageBuilder and SDK tarballs, however it may fail on some Linux distributions.
175 config SHADOW_PASSWORDS
177 prompt "Enable shadow password support"
180 Enable shadow password support.
184 prompt "Remove ipkg/opkg status data files in final images"
187 This removes all ipkg/opkg status data files from the target directory before building the root fs
189 config COLLECT_KERNEL_DEBUG
191 prompt "Collect kernel debug information"
192 select KERNEL_DEBUG_INFO
195 This collects debugging symbols from the kernel and all compiled modules.
196 Useful for release builds, so that kernel issues can be debugged offline later.
198 comment "Kernel build options"
200 config KERNEL_DEBUG_FS
201 bool "Compile the kernel with Debug FileSystem enabled"
204 debugfs is a virtual file system that kernel developers use to put
205 debugging files into. Enable this option to be able to read and
206 write to these files.
208 config KERNEL_PERF_EVENTS
212 config KERNEL_PROFILING
213 bool "Compile the kernel with profiling enabled"
215 select KERNEL_PERF_EVENTS
217 Enable the extended profiling support mechanisms used by profilers such
220 config KERNEL_KALLSYMS
221 bool "Compile the kernel with symbol table information"
224 This will give you more information in stack traces from kernel oopses
227 bool "Compile the kernel with tracing support"
230 config KERNEL_ENABLE_DEFAULT_TRACERS
231 bool "Trace process context switches and events"
232 depends on KERNEL_FTRACE
235 config KERNEL_DEBUG_KERNEL
239 config KERNEL_DEBUG_INFO
240 bool "Compile the kernel with debug information"
242 select KERNEL_DEBUG_KERNEL
244 This will compile your kernel and modules with debug information.
246 config KERNEL_DEBUG_LL_UART_NONE
251 config KERNEL_DEBUG_LL
255 select KERNEL_DEBUG_LL_UART_NONE
257 ARM low level debugging
259 config KERNEL_EARLY_PRINTK
260 bool "Compile the kernel with early printk"
263 select KERNEL_DEBUG_KERNEL
264 select KERNEL_DEBUG_LL if arm
266 Compile the kernel with early printk support.
267 This is only useful for debugging purposes to send messages
268 over the serial console in early boot.
269 Enable this to debug early boot problems.
272 bool "Compile the kernel with asynchronous IO support"
275 config KERNEL_DIRECT_IO
276 bool "Compile the kernel with direct IO support"
279 config KERNEL_MAGIC_SYSRQ
280 bool "Compile the kernel with SysRq support"
283 config KERNEL_COREDUMP
286 config KERNEL_ELF_CORE
287 bool "Enable process core dump support"
288 select KERNEL_COREDUMP
291 config KERNEL_PROVE_LOCKING
292 bool "Enable kernel lock checking"
293 select KERNEL_DEBUG_KERNEL
296 config KERNEL_PRINTK_TIME
297 bool "Enable printk timestamps"
304 # CGROUP support symbols
307 config KERNEL_CGROUPS
308 bool "Enable kernel cgroups"
313 config KERNEL_CGROUP_DEBUG
314 bool "Example debug cgroup subsystem"
317 This option enables a simple cgroup subsystem that
318 exports useful debugging information about the cgroups
321 config KERNEL_FREEZER
323 default y if KERNEL_CGROUP_FREEZER
325 config KERNEL_CGROUP_FREEZER
326 bool "Freezer cgroup subsystem"
329 Provides a way to freeze and unfreeze all tasks in a
332 config KERNEL_CGROUP_DEVICE
333 bool "Device controller for cgroups"
336 Provides a cgroup implementing whitelists for devices which
337 a process in the cgroup can mknod or open.
339 config KERNEL_CPUSETS
340 bool "Cpuset support"
343 This option will let you create and manage CPUSETs which
344 allow dynamically partitioning a system into sets of CPUs and
345 Memory Nodes and assigning tasks to run only within those sets.
346 This is primarily useful on large SMP or NUMA systems.
348 config KERNEL_PROC_PID_CPUSET
349 bool "Include legacy /proc/<pid>/cpuset file"
351 depends on KERNEL_CPUSETS
353 config KERNEL_CGROUP_CPUACCT
354 bool "Simple CPU accounting cgroup subsystem"
357 Provides a simple Resource Controller for monitoring the
358 total CPU consumed by the tasks in a cgroup.
360 config KERNEL_RESOURCE_COUNTERS
361 bool "Resource counters"
364 This option enables controller independent resource accounting
365 infrastructure that works with cgroups.
367 config KERNEL_MM_OWNER
369 default y if KERNEL_MEMCG
372 bool "Memory Resource Controller for Control Groups"
374 depends on KERNEL_RESOURCE_COUNTERS
376 Provides a memory resource controller that manages both anonymous
377 memory and page cache. (See Documentation/cgroups/memory.txt)
379 Note that setting this option increases fixed memory overhead
380 associated with each page of memory in the system. By this,
381 20(40)bytes/PAGE_SIZE on 32(64)bit system will be occupied by memory
382 usage tracking struct at boot. Total amount of this is printed out
385 Only enable when you're ok with these trade offs and really
386 sure you need the memory resource controller. Even when you enable
387 this, you can set "cgroup_disable=memory" at your boot option to
388 disable memory resource controller and you can avoid overheads.
389 (and lose benefits of memory resource controller)
391 This config option also selects MM_OWNER config option, which
392 could in turn add some fork/exit overhead.
394 config KERNEL_MEMCG_SWAP
395 bool "Memory Resource Controller Swap Extension"
397 depends on KERNEL_MEMCG
399 Add swap management feature to memory resource controller. When you
400 enable this, you can limit mem+swap usage per cgroup. In other words,
401 when you disable this, memory resource controller has no cares to
402 usage of swap...a process can exhaust all of the swap. This extension
403 is useful when you want to avoid exhaustion swap but this itself
404 adds more overheads and consumes memory for remembering information.
405 Especially if you use 32bit system or small memory system, please
406 be careful about enabling this. When memory resource controller
407 is disabled by boot option, this will be automatically disabled and
408 there will be no overhead from this. Even when you set this config=y,
409 if boot option "swapaccount=0" is set, swap will not be accounted.
410 Now, memory usage of swap_cgroup is 2 bytes per entry. If swap page
411 size is 4096bytes, 512k per 1Gbytes of swap.
413 config KERNEL_MEMCG_SWAP_ENABLED
414 bool "Memory Resource Controller Swap Extension enabled by default"
416 depends on KERNEL_MEMCG_SWAP
418 Memory Resource Controller Swap Extension comes with its price in
419 a bigger memory consumption. General purpose distribution kernels
420 which want to enable the feature but keep it disabled by default
421 and let the user enable it by swapaccount boot command line
422 parameter should have this option unselected.
423 For those who want to have the feature enabled by default should
424 select this option (if, for some reason, they need to disable it
425 then swapaccount=0 does the trick).
428 config KERNEL_MEMCG_KMEM
429 bool "Memory Resource Controller Kernel Memory accounting (EXPERIMENTAL)"
431 depends on KERNEL_MEMCG
433 The Kernel Memory extension for Memory Resource Controller can limit
434 the amount of memory used by kernel objects in the system. Those are
435 fundamentally different from the entities handled by the standard
436 Memory Controller, which are page-based, and can be swapped. Users of
437 the kmem extension can use it to guarantee that no group of processes
438 will ever exhaust kernel resources alone.
440 config KERNEL_PERF_EVENTS
442 default y if KERNEL_CGROUP_PERF
444 config KERNEL_CGROUP_PERF
445 bool "Enable perf_event per-cpu per-container group (cgroup) monitoring"
448 This option extends the per-cpu mode to restrict monitoring to
449 threads which belong to the cgroup specified and run on the
452 menuconfig KERNEL_CGROUP_SCHED
453 bool "Group CPU scheduler"
456 This feature lets CPU scheduler recognize task groups and control CPU
457 bandwidth allocation to such task groups. It uses cgroups to group
460 if KERNEL_CGROUP_SCHED
462 config KERNEL_FAIR_GROUP_SCHED
463 bool "Group scheduling for SCHED_OTHER"
466 config KERNEL_CFS_BANDWIDTH
467 bool "CPU bandwidth provisioning for FAIR_GROUP_SCHED"
469 depends on KERNEL_FAIR_GROUP_SCHED
471 This option allows users to define CPU bandwidth rates (limits) for
472 tasks running within the fair group scheduler. Groups with no limit
473 set are considered to be unconstrained and will run with no
475 See tip/Documentation/scheduler/sched-bwc.txt for more information.
477 config KERNEL_RT_GROUP_SCHED
478 bool "Group scheduling for SCHED_RR/FIFO"
481 This feature lets you explicitly allocate real CPU bandwidth
482 to task groups. If enabled, it will also make it impossible to
483 schedule realtime tasks for non-root users until you allocate
484 realtime bandwidth for them.
488 config KERNEL_BLK_CGROUP
489 bool "Block IO controller"
492 Generic block IO controller cgroup interface. This is the common
493 cgroup interface which should be used by various IO controlling
496 Currently, CFQ IO scheduler uses it to recognize task groups and
497 control disk bandwidth allocation (proportional time slice allocation)
498 to such task groups. It is also used by bio throttling logic in
499 block layer to implement upper limit in IO rates on a device.
501 This option only enables generic Block IO controller infrastructure.
502 One needs to also enable actual IO controlling logic/policy. For
503 enabling proportional weight division of disk bandwidth in CFQ, set
504 CONFIG_CFQ_GROUP_IOSCHED=y; for enabling throttling policy, set
505 CONFIG_BLK_DEV_THROTTLING=y.
507 config KERNEL_DEBUG_BLK_CGROUP
508 bool "Enable Block IO controller debugging"
510 depends on KERNEL_BLK_CGROUP
512 Enable some debugging help. Currently it exports additional stat
513 files in a cgroup which can be useful for debugging.
515 config KERNEL_NET_CLS_CGROUP
516 bool "Control Group Classifier"
519 config KERNEL_NETPRIO_CGROUP
520 bool "Network priority cgroup"
526 # Namespace support symbols
529 config KERNEL_NAMESPACES
530 bool "Enable kernel namespaces"
539 In this namespace tasks see different info provided
540 with the uname() system call
546 In this namespace tasks work with IPC ids which correspond to
547 different IPC objects in different namespaces.
549 config KERNEL_USER_NS
550 bool "User namespace (EXPERIMENTAL)"
553 This allows containers, i.e. vservers, to use user namespaces
554 to provide different user info for different servers.
557 bool "PID Namespaces"
560 Support process id namespaces. This allows having multiple
561 processes with the same pid as long as they are in different
562 pid namespaces. This is a building block of containers.
565 bool "Network namespace"
568 Allow user space to create what appear to be multiple instances
569 of the network stack.
571 config KERNEL_DEVPTS_MULTIPLE_INSTANCES
572 bool "Support multiple instances of devpts"
575 Enable support for multiple instances of devpts filesystem.
576 If you want to have isolated PTY namespaces (eg: in containers),
577 say Y here. Otherwise, say N. If enabled, each mount of devpts
578 filesystem with the '-o newinstance' option will create an
579 independent PTY namespace.
583 comment "Package build options"
587 prompt "Compile packages with debugging info"
590 Adds -g3 to the CFLAGS
594 prompt "Enable IPv6 support in packages"
597 Enable IPV6 support in packages (passes --enable-ipv6 to configure scripts).
599 config PKG_BUILD_PARALLEL
601 prompt "Compile certain packages parallelized"
604 This adds a -jX option to certain packages that are known to
605 behave well for parallel build. By default the package make processes
606 use the main jobserver, in which case this option only takes effect
607 when you add -jX to the make command.
609 If you are unsure, select N.
611 config PKG_BUILD_USE_JOBSERVER
613 prompt "Use top-level make jobserver for packages"
614 depends on PKG_BUILD_PARALLEL
617 This passes the main make process jobserver fds to package builds,
618 enabling full parallelization across different packages
620 Note that disabling this may overcommit CPU resources depending on the
621 -j level of the main make process, the number of package
622 submake jobs selected below and the number of actual CPUs present.
623 Example: If the main make is passed a -j4 and the submake -j
624 is also set to 4, we may end up with 16 parallel make processes
628 config PKG_BUILD_JOBS
630 prompt "Number of package submake jobs (2-512)"
633 depends on PKG_BUILD_PARALLEL && !PKG_BUILD_USE_JOBSERVER
635 The number of jobs (-jX) to pass to packages submake.
637 config PKG_DEFAULT_PARALLEL
639 prompt "Parallelize the default package build rule (May break build)"
640 depends on PKG_BUILD_PARALLEL
644 Always set the default package build rules to parallel build.
646 WARNING: This may break build or kill your cat, as it builds
647 packages with multiple jobs that are probably not tested in
648 a parallel build environment.
650 Only say Y, if you don't mind fixing broken packages.
651 Before reporting build bugs, set this to N and re-run the build.
653 comment "Stripping options"
656 prompt "Binary stripping method"
657 default USE_STRIP if EXTERNAL_TOOLCHAIN
658 default USE_STRIP if USE_GLIBC || USE_EGLIBC || USE_MUSL
661 Select the binary stripping method you wish to use.
666 This will install unstripped binaries (useful for native compiling/debugging)
671 This will install binaries stripped using strip from binutils
677 depends on !USE_GLIBC
678 depends on !USE_EGLIBC
680 This will install binaries stripped using sstrip
685 prompt "Strip arguments"
687 default "--strip-unneeded --remove-section=.comment --remove-section=.note" if DEBUG
688 default "--strip-all"
690 Specifies arguments passed to the strip command when stripping binaries
692 config STRIP_KERNEL_EXPORTS
693 bool "Strip unnecessary exports from the kernel image"
695 Reduces kernel size by stripping unused kernel exports from the kernel image
696 Note that this might make the kernel incompatible with any kernel modules that
697 were not selected at the time the kernel image was created
700 bool "Strip unnecessary functions from libraries"
702 Reduces libraries to only those functions that are necessary for using all
703 selected packages (including those selected as <M>)
704 Note that this will make the system libraries incompatible with most of the packages
705 that are not selected during the build process
708 prompt "Preferred standard C++ library"
709 default USE_LIBSTDCXX if USE_EGLIBC
712 Select the preferred standard C++ library for all packages that support this.
724 bool "Advanced configuration options (for developers)"
728 bool "Show broken platforms / packages" if DEVEL
731 config DOWNLOAD_FOLDER
732 string "Download folder" if DEVEL
736 string "Local mirror for source packages" if DEVEL
740 bool "Automatic rebuild of packages" if DEVEL
743 Automatically rebuild packages when their files change
746 string "Build suffix to append to the BUILD_DIR variable" if DEVEL
749 Build suffix to append to the BUILD_DIR variable, i.e: build_dir_suffix
751 config TARGET_ROOTFS_DIR
752 string "Override the default TARGET_ROOTFS_DIR variable" if DEVEL
755 Override the default TARGET_ROOTFS_DIR variable content $(BUILD_DIR) with custom path.
756 Use this option to re-define the location of the target root file system directory.
759 bool "Use ccache" if DEVEL
762 Compiler cache; see http://ccache.samba.org/
764 config EXTERNAL_KERNEL_TREE
765 string "Use external kernel tree" if DEVEL
768 config KERNEL_GIT_CLONE_URI
769 string "Enter git repository to clone" if DEVEL
772 Enter the full git repository path i.e.:
773 git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git
774 This will create a git clone of the kernel in your build
777 config KERNEL_GIT_LOCAL_REPOSITORY
778 string "Enter path to local reference repository" if DEVEL
781 Enter a full pathname to a local reference git repository.
782 In this instance, the --refererence option of git clone will
783 be used thus creating a quick local clone of your repo.
786 bool "Enable log files during build process" if DEVEL
788 If enabled log files will be written to the ./log directory
790 config SRC_TREE_OVERRIDE
791 bool "Enable package source tree override" if DEVEL
793 If enabled, you can force a package to use a git tree as source
794 code instead of the normal tarball. Create a symlink 'git-src'
795 in the package directory, pointing to the .git tree that you want
796 to pull the source code from
798 menuconfig TARGET_OPTIONS
799 bool "Target Options" if DEVEL
801 config TARGET_OPTIMIZATION
802 string "Target Optimizations" if TARGET_OPTIONS
803 default DEFAULT_TARGET_OPTIMIZATION
805 Optimizations to use when building for the target host.
808 bool "Use software floating point by default" if TARGET_OPTIONS
810 depends on (arm || armeb || powerpc || mipsel || mips || mips64el || mips64) && !HAS_FPU
812 If your target CPU does not have a Floating Point Unit (FPU) or a
813 kernel FPU emulator, but you still wish to support floating point
814 functions, then everything will need to be compiled with soft floating
815 point support (-msoft-float).
817 Most people will answer N.
820 bool "Build packages with MIPS16 instructions" if TARGET_OPTIONS
821 depends on HAS_MIPS16
823 If your target CPU does support the MIPS16 instruction set
824 and you want to use it for packages, enable this option.
825 MIPS16 produces smaller binaries thus reducing pressure on
828 Most people will answer N.
830 source "toolchain/Config.in"
832 source "target/imagebuilder/Config.in"
833 source "target/sdk/Config.in"
834 source "target/toolchain/Config.in"
836 source "tmp/.config-package.in"