2 # For a description of the syntax of this configuration file,
3 # see Documentation/kbuild/kconfig-language.txt.
6 mainmenu "Linux Kernel Configuration"
15 select SYS_SUPPORTS_APM_EMULATION
16 select GENERIC_ATOMIC64 if (!CPU_32v6K)
17 select HAVE_OPROFILE if (HAVE_PERF_EVENTS)
19 select HAVE_KPROBES if (!XIP_KERNEL)
20 select HAVE_KRETPROBES if (HAVE_KPROBES)
21 select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
22 select HAVE_GENERIC_DMA_COHERENT
23 select HAVE_KERNEL_GZIP
24 select HAVE_KERNEL_LZO
25 select HAVE_KERNEL_LZMA
26 select HAVE_PERF_EVENTS
27 select PERF_USE_VMALLOC
28 select HAVE_REGS_AND_STACK_ACCESS_API
30 The ARM series is a line of low-power-consumption RISC chip designs
31 licensed by ARM Ltd and targeted at embedded applications and
32 handhelds such as the Compaq IPAQ. ARM-based PCs are no longer
33 manufactured, but legacy ARM-based PC hardware remains popular in
34 Europe. There is an ARM Linux project with a web page at
35 <http://www.arm.linux.org.uk/>.
40 config SYS_SUPPORTS_APM_EMULATION
46 config ARCH_USES_GETTIMEOFFSET
50 config GENERIC_CLOCKEVENTS
53 config GENERIC_CLOCKEVENTS_BROADCAST
55 depends on GENERIC_CLOCKEVENTS
60 select GENERIC_ALLOCATOR
71 The Extended Industry Standard Architecture (EISA) bus was
72 developed as an open alternative to the IBM MicroChannel bus.
74 The EISA bus provided some of the features of the IBM MicroChannel
75 bus while maintaining backward compatibility with cards made for
76 the older ISA bus. The EISA bus saw limited use between 1988 and
77 1995 when it was made obsolete by the PCI bus.
79 Say Y here if you are building a kernel for an EISA-based machine.
89 MicroChannel Architecture is found in some IBM PS/2 machines and
90 laptops. It is a bus system similar to PCI or ISA. See
91 <file:Documentation/mca.txt> (and especially the web page given
92 there) before attempting to build an MCA bus kernel.
94 config GENERIC_HARDIRQS
98 config STACKTRACE_SUPPORT
102 config HAVE_LATENCYTOP_SUPPORT
107 config LOCKDEP_SUPPORT
111 config TRACE_IRQFLAGS_SUPPORT
115 config HARDIRQS_SW_RESEND
119 config GENERIC_IRQ_PROBE
123 config GENERIC_LOCKBREAK
126 depends on SMP && PREEMPT
128 config RWSEM_GENERIC_SPINLOCK
132 config RWSEM_XCHGADD_ALGORITHM
135 config ARCH_HAS_ILOG2_U32
138 config ARCH_HAS_ILOG2_U64
141 config ARCH_HAS_CPUFREQ
144 Internal node to signify that the ARCH has CPUFREQ support
145 and that the relevant menu configurations are displayed for
148 config GENERIC_HWEIGHT
152 config GENERIC_CALIBRATE_DELAY
156 config ARCH_MAY_HAVE_PC_FDC
162 config NEED_DMA_MAP_STATE
165 config GENERIC_ISA_DMA
174 config GENERIC_HARDIRQS_NO__DO_IRQ
177 config ARM_L1_CACHE_SHIFT_6
180 Setting ARM L1 cache line size to 64 Bytes.
184 default 0xffff0000 if MMU || CPU_HIGH_VECTOR
185 default DRAM_BASE if REMAP_VECTORS_TO_RAM
188 The base address of exception vectors.
190 source "init/Kconfig"
192 source "kernel/Kconfig.freezer"
197 bool "MMU-based Paged Memory Management Support"
200 Select if you want MMU-based virtualised addressing space
201 support by paged memory management. If unsure, say 'Y'.
204 # The "ARM system type" choice list is ordered alphabetically by option
205 # text. Please add new entries in the option alphabetic order.
208 prompt "ARM system type"
209 default ARCH_VERSATILE
212 bool "Agilent AAEC-2000 based"
216 select ARCH_USES_GETTIMEOFFSET
218 This enables support for systems based on the Agilent AAEC-2000
220 config ARCH_INTEGRATOR
221 bool "ARM Ltd. Integrator family"
223 select ARCH_HAS_CPUFREQ
226 select GENERIC_CLOCKEVENTS
227 select PLAT_VERSATILE
229 Support for ARM's Integrator platform.
232 bool "ARM Ltd. RealView family"
236 select GENERIC_CLOCKEVENTS
237 select ARCH_WANT_OPTIONAL_GPIOLIB
238 select PLAT_VERSATILE
239 select ARM_TIMER_SP804
240 select GPIO_PL061 if GPIOLIB
242 This enables support for ARM Ltd RealView boards.
244 config ARCH_VERSATILE
245 bool "ARM Ltd. Versatile family"
250 select GENERIC_CLOCKEVENTS
251 select ARCH_WANT_OPTIONAL_GPIOLIB
252 select PLAT_VERSATILE
253 select ARM_TIMER_SP804
255 This enables support for ARM Ltd Versatile board.
258 bool "ARM Ltd. Versatile Express family"
259 select ARCH_WANT_OPTIONAL_GPIOLIB
261 select ARM_TIMER_SP804
263 select GENERIC_CLOCKEVENTS
266 select PLAT_VERSATILE
268 This enables support for the ARM Ltd Versatile Express boards.
272 select ARCH_REQUIRE_GPIOLIB
274 select ARCH_USES_GETTIMEOFFSET
276 This enables support for systems based on the Atmel AT91RM9200,
277 AT91SAM9 and AT91CAP9 processors.
280 bool "Broadcom BCMRING"
285 select GENERIC_CLOCKEVENTS
286 select ARCH_WANT_OPTIONAL_GPIOLIB
288 Support for Broadcom's BCMRing platform.
291 bool "Cirrus Logic CLPS711x/EP721x-based"
293 select ARCH_USES_GETTIMEOFFSET
295 Support for Cirrus Logic 711x/721x based boards.
298 bool "Cavium Networks CNS3XXX family"
300 select GENERIC_CLOCKEVENTS
302 select PCI_DOMAINS if PCI
304 Support for Cavium Networks CNS3XXX platform.
307 bool "Cortina Systems Gemini"
309 select ARCH_REQUIRE_GPIOLIB
310 select ARCH_USES_GETTIMEOFFSET
312 Support for the Cortina Systems Gemini family SoCs
319 select ARCH_USES_GETTIMEOFFSET
321 This is an evaluation board for the StrongARM processor available
322 from Digital. It has limited hardware on-board, including an
323 Ethernet interface, two PCMCIA sockets, two serial ports and a
332 select ARCH_REQUIRE_GPIOLIB
333 select ARCH_HAS_HOLES_MEMORYMODEL
334 select ARCH_USES_GETTIMEOFFSET
336 This enables support for the Cirrus EP93xx series of CPUs.
338 config ARCH_FOOTBRIDGE
342 select ARCH_USES_GETTIMEOFFSET
344 Support for systems based on the DC21285 companion chip
345 ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder.
348 bool "Freescale MXC/iMX-based"
349 select GENERIC_CLOCKEVENTS
350 select ARCH_REQUIRE_GPIOLIB
353 Support for Freescale MXC/iMX-based family of processors
356 bool "Freescale STMP3xxx"
359 select ARCH_REQUIRE_GPIOLIB
360 select GENERIC_CLOCKEVENTS
361 select USB_ARCH_HAS_EHCI
363 Support for systems based on the Freescale 3xxx CPUs.
366 bool "Hilscher NetX based"
369 select GENERIC_CLOCKEVENTS
371 This enables support for systems based on the Hilscher NetX Soc
374 bool "Hynix HMS720x-based"
377 select ARCH_USES_GETTIMEOFFSET
379 This enables support for systems based on the Hynix HMS720x
387 select ARCH_SUPPORTS_MSI
390 Support for Intel's IOP13XX (XScale) family of processors.
398 select ARCH_REQUIRE_GPIOLIB
400 Support for Intel's 80219 and IOP32X (XScale) family of
409 select ARCH_REQUIRE_GPIOLIB
411 Support for Intel's IOP33X (XScale) family of processors.
418 select ARCH_USES_GETTIMEOFFSET
420 Support for Intel's IXP23xx (XScale) family of processors.
423 bool "IXP2400/2800-based"
427 select ARCH_USES_GETTIMEOFFSET
429 Support for Intel's IXP2400/2800 (XScale) family of processors.
436 select GENERIC_CLOCKEVENTS
437 select DMABOUNCE if PCI
439 Support for Intel's IXP4XX (XScale) family of processors.
444 select ARCH_REQUIRE_GPIOLIB
445 select GENERIC_CLOCKEVENTS
448 Support for the Marvell Dove SoC 88AP510
451 bool "Marvell Kirkwood"
454 select ARCH_REQUIRE_GPIOLIB
455 select GENERIC_CLOCKEVENTS
458 Support for the following Marvell Kirkwood series SoCs:
459 88F6180, 88F6192 and 88F6281.
462 bool "Marvell Loki (88RC8480)"
464 select GENERIC_CLOCKEVENTS
467 Support for the Marvell Loki (88RC8480) SoC.
472 select ARCH_REQUIRE_GPIOLIB
475 select USB_ARCH_HAS_OHCI
478 select GENERIC_CLOCKEVENTS
480 Support for the NXP LPC32XX family of processors
483 bool "Marvell MV78xx0"
486 select ARCH_REQUIRE_GPIOLIB
487 select GENERIC_CLOCKEVENTS
490 Support for the following Marvell MV78xx0 series SoCs:
498 select ARCH_REQUIRE_GPIOLIB
499 select GENERIC_CLOCKEVENTS
502 Support for the following Marvell Orion 5x series SoCs:
503 Orion-1 (5181), Orion-VoIP (5181L), Orion-NAS (5182),
504 Orion-2 (5281), Orion-1-90 (6183).
507 bool "Marvell PXA168/910/MMP2"
509 select ARCH_REQUIRE_GPIOLIB
511 select GENERIC_CLOCKEVENTS
515 Support for Marvell's PXA168/PXA910(MMP) and MMP2 processor line.
518 bool "Micrel/Kendin KS8695"
520 select ARCH_REQUIRE_GPIOLIB
521 select ARCH_USES_GETTIMEOFFSET
523 Support for Micrel/Kendin KS8695 "Centaur" (ARM922T) based
524 System-on-Chip devices.
527 bool "NetSilicon NS9xxx"
530 select GENERIC_CLOCKEVENTS
533 Say Y here if you intend to run this kernel on a NetSilicon NS9xxx
536 <http://www.digi.com/products/microprocessors/index.jsp>
539 bool "Nuvoton W90X900 CPU"
541 select ARCH_REQUIRE_GPIOLIB
543 select GENERIC_CLOCKEVENTS
545 Support for Nuvoton (Winbond logic dept.) ARM9 processor,
546 At present, the w90x900 has been renamed nuc900, regarding
547 the ARM series product line, you can login the following
548 link address to know more.
550 <http://www.nuvoton.com/hq/enu/ProductAndSales/ProductLines/
551 ConsumerElectronicsIC/ARMMicrocontroller/ARMMicrocontroller>
554 bool "Nuvoton NUC93X CPU"
558 Support for Nuvoton (Winbond logic dept.) NUC93X MCU,The NUC93X is a
559 low-power and high performance MPEG-4/JPEG multimedia controller chip.
564 select GENERIC_CLOCKEVENTS
568 select ARCH_HAS_BARRIERS if CACHE_L2X0
570 This enables support for NVIDIA Tegra based systems (Tegra APX,
571 Tegra 6xx and Tegra 2 series).
574 bool "Philips Nexperia PNX4008 Mobile"
577 select ARCH_USES_GETTIMEOFFSET
579 This enables support for Philips PNX4008 mobile platform.
582 bool "PXA2xx/PXA3xx-based"
585 select ARCH_HAS_CPUFREQ
587 select ARCH_REQUIRE_GPIOLIB
588 select GENERIC_CLOCKEVENTS
592 Support for Intel/Marvell's PXA2xx/PXA3xx processor line.
597 select GENERIC_CLOCKEVENTS
598 select ARCH_REQUIRE_GPIOLIB
600 Support for Qualcomm MSM/QSD based systems. This runs on the
601 apps processor of the MSM/QSD and depends on a shared memory
602 interface to the modem processor which runs the baseband
603 stack and controls some vital subsystems
604 (clock and power control, etc).
607 bool "Renesas SH-Mobile"
609 Support for Renesas's SH-Mobile ARM platforms
616 select ARCH_MAY_HAVE_PC_FDC
617 select HAVE_PATA_PLATFORM
620 select ARCH_SPARSEMEM_ENABLE
621 select ARCH_USES_GETTIMEOFFSET
623 On the Acorn Risc-PC, Linux can support the internal IDE disk and
624 CD-ROM interface, serial and parallel port, and the floppy drive.
630 select ARCH_SPARSEMEM_ENABLE
632 select ARCH_HAS_CPUFREQ
634 select GENERIC_CLOCKEVENTS
637 select ARCH_REQUIRE_GPIOLIB
639 Support for StrongARM 11x0 based boards.
642 bool "Samsung S3C2410, S3C2412, S3C2413, S3C2416, S3C2440, S3C2442, S3C2443, S3C2450"
644 select ARCH_HAS_CPUFREQ
646 select ARCH_USES_GETTIMEOFFSET
647 select HAVE_S3C2410_I2C
649 Samsung S3C2410X CPU based systems, such as the Simtec Electronics
650 BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or
651 the Samsung SMDK2410 development board (and derivatives).
653 Note, the S3C2416 and the S3C2450 are so close that they even share
654 the same SoC ID code. This means that there is no seperate machine
655 directory (no arch/arm/mach-s3c2450) as the S3C2416 was first.
658 bool "Samsung S3C64XX"
664 select ARCH_USES_GETTIMEOFFSET
665 select ARCH_HAS_CPUFREQ
666 select ARCH_REQUIRE_GPIOLIB
667 select SAMSUNG_CLKSRC
668 select SAMSUNG_IRQ_VIC_TIMER
669 select SAMSUNG_IRQ_UART
670 select S3C_GPIO_TRACK
671 select S3C_GPIO_PULL_UPDOWN
672 select S3C_GPIO_CFG_S3C24XX
673 select S3C_GPIO_CFG_S3C64XX
675 select USB_ARCH_HAS_OHCI
676 select SAMSUNG_GPIOLIB_4BIT
677 select HAVE_S3C2410_I2C
678 select HAVE_S3C2410_WATCHDOG
680 Samsung S3C64XX series based systems
683 bool "Samsung S5P6440"
687 select HAVE_S3C2410_WATCHDOG
688 select ARCH_USES_GETTIMEOFFSET
689 select HAVE_S3C2410_I2C
692 Samsung S5P6440 CPU based systems
695 bool "Samsung S5P6442"
699 select ARCH_USES_GETTIMEOFFSET
700 select HAVE_S3C2410_WATCHDOG
702 Samsung S5P6442 CPU based systems
705 bool "Samsung S5PC100"
709 select ARM_L1_CACHE_SHIFT_6
710 select ARCH_USES_GETTIMEOFFSET
711 select HAVE_S3C2410_I2C
713 select HAVE_S3C2410_WATCHDOG
715 Samsung S5PC100 series based systems
718 bool "Samsung S5PV210/S5PC110"
722 select ARM_L1_CACHE_SHIFT_6
723 select ARCH_USES_GETTIMEOFFSET
724 select HAVE_S3C2410_I2C
726 select HAVE_S3C2410_WATCHDOG
728 Samsung S5PV210/S5PC110 series based systems
731 bool "Samsung S5PV310/S5PC210"
735 select GENERIC_CLOCKEVENTS
737 Samsung S5PV310 series based systems
746 select ARCH_USES_GETTIMEOFFSET
748 Support for the StrongARM based Digital DNARD machine, also known
749 as "Shark" (<http://www.shark-linux.de/shark.html>).
752 bool "Telechips TCC ARM926-based systems"
756 select GENERIC_CLOCKEVENTS
758 Support for Telechips TCC ARM926-based systems.
763 select ARCH_SPARSEMEM_ENABLE if !LH7A40X_CONTIGMEM
764 select ARCH_USES_GETTIMEOFFSET
766 Say Y here for systems based on one of the Sharp LH7A40X
767 System on a Chip processors. These CPUs include an ARM922T
768 core with a wide array of integrated devices for
769 hand-held and low-power applications.
772 bool "ST-Ericsson U300 Series"
778 select GENERIC_CLOCKEVENTS
782 Support for ST-Ericsson U300 series mobile platforms.
785 bool "ST-Ericsson U8500 Series"
788 select GENERIC_CLOCKEVENTS
790 select ARCH_REQUIRE_GPIOLIB
792 Support for ST-Ericsson's Ux500 architecture
795 bool "STMicroelectronics Nomadik"
800 select GENERIC_CLOCKEVENTS
801 select ARCH_REQUIRE_GPIOLIB
803 Support for the Nomadik platform by ST-Ericsson
807 select GENERIC_CLOCKEVENTS
808 select ARCH_REQUIRE_GPIOLIB
812 select GENERIC_ALLOCATOR
813 select ARCH_HAS_HOLES_MEMORYMODEL
815 Support for TI's DaVinci platform.
820 select ARCH_REQUIRE_GPIOLIB
821 select ARCH_HAS_CPUFREQ
822 select GENERIC_CLOCKEVENTS
823 select ARCH_HAS_HOLES_MEMORYMODEL
825 Support for TI's OMAP platform (OMAP1 and OMAP2).
830 select ARCH_REQUIRE_GPIOLIB
832 select GENERIC_CLOCKEVENTS
835 Support for ST's SPEAr platform (SPEAr3xx, SPEAr6xx and SPEAr13xx).
840 # This is sorted alphabetically by mach-* pathname. However, plat-*
841 # Kconfigs may be included either alphabetically (according to the
842 # plat- suffix) or along side the corresponding mach-* source.
844 source "arch/arm/mach-aaec2000/Kconfig"
846 source "arch/arm/mach-at91/Kconfig"
848 source "arch/arm/mach-bcmring/Kconfig"
850 source "arch/arm/mach-clps711x/Kconfig"
852 source "arch/arm/mach-cns3xxx/Kconfig"
854 source "arch/arm/mach-davinci/Kconfig"
856 source "arch/arm/mach-dove/Kconfig"
858 source "arch/arm/mach-ep93xx/Kconfig"
860 source "arch/arm/mach-footbridge/Kconfig"
862 source "arch/arm/mach-gemini/Kconfig"
864 source "arch/arm/mach-h720x/Kconfig"
866 source "arch/arm/mach-integrator/Kconfig"
868 source "arch/arm/mach-iop32x/Kconfig"
870 source "arch/arm/mach-iop33x/Kconfig"
872 source "arch/arm/mach-iop13xx/Kconfig"
874 source "arch/arm/mach-ixp4xx/Kconfig"
876 source "arch/arm/mach-ixp2000/Kconfig"
878 source "arch/arm/mach-ixp23xx/Kconfig"
880 source "arch/arm/mach-kirkwood/Kconfig"
882 source "arch/arm/mach-ks8695/Kconfig"
884 source "arch/arm/mach-lh7a40x/Kconfig"
886 source "arch/arm/mach-loki/Kconfig"
888 source "arch/arm/mach-lpc32xx/Kconfig"
890 source "arch/arm/mach-msm/Kconfig"
892 source "arch/arm/mach-mv78xx0/Kconfig"
894 source "arch/arm/plat-mxc/Kconfig"
896 source "arch/arm/mach-netx/Kconfig"
898 source "arch/arm/mach-nomadik/Kconfig"
899 source "arch/arm/plat-nomadik/Kconfig"
901 source "arch/arm/mach-ns9xxx/Kconfig"
903 source "arch/arm/mach-nuc93x/Kconfig"
905 source "arch/arm/plat-omap/Kconfig"
907 source "arch/arm/mach-omap1/Kconfig"
909 source "arch/arm/mach-omap2/Kconfig"
911 source "arch/arm/mach-orion5x/Kconfig"
913 source "arch/arm/mach-pxa/Kconfig"
914 source "arch/arm/plat-pxa/Kconfig"
916 source "arch/arm/mach-mmp/Kconfig"
918 source "arch/arm/mach-realview/Kconfig"
920 source "arch/arm/mach-sa1100/Kconfig"
922 source "arch/arm/plat-samsung/Kconfig"
923 source "arch/arm/plat-s3c24xx/Kconfig"
924 source "arch/arm/plat-s5p/Kconfig"
926 source "arch/arm/plat-spear/Kconfig"
928 source "arch/arm/plat-tcc/Kconfig"
931 source "arch/arm/mach-s3c2400/Kconfig"
932 source "arch/arm/mach-s3c2410/Kconfig"
933 source "arch/arm/mach-s3c2412/Kconfig"
934 source "arch/arm/mach-s3c2416/Kconfig"
935 source "arch/arm/mach-s3c2440/Kconfig"
936 source "arch/arm/mach-s3c2443/Kconfig"
940 source "arch/arm/mach-s3c64xx/Kconfig"
943 source "arch/arm/mach-s5p6440/Kconfig"
945 source "arch/arm/mach-s5p6442/Kconfig"
947 source "arch/arm/mach-s5pc100/Kconfig"
949 source "arch/arm/mach-s5pv210/Kconfig"
951 source "arch/arm/mach-s5pv310/Kconfig"
953 source "arch/arm/mach-shmobile/Kconfig"
955 source "arch/arm/plat-stmp3xxx/Kconfig"
957 source "arch/arm/mach-tegra/Kconfig"
959 source "arch/arm/mach-u300/Kconfig"
961 source "arch/arm/mach-ux500/Kconfig"
963 source "arch/arm/mach-versatile/Kconfig"
965 source "arch/arm/mach-vexpress/Kconfig"
967 source "arch/arm/mach-w90x900/Kconfig"
969 # Definitions to make life easier
975 select GENERIC_CLOCKEVENTS
983 config PLAT_VERSATILE
986 config ARM_TIMER_SP804
989 source arch/arm/mm/Kconfig
992 bool "Enable iWMMXt support"
993 depends on CPU_XSCALE || CPU_XSC3 || CPU_MOHAWK
994 default y if PXA27x || PXA3xx || ARCH_MMP
996 Enable support for iWMMXt context switching at run time if
997 running on a CPU that supports it.
999 # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER
1002 depends on CPU_XSCALE && !XSCALE_PMU_TIMER
1006 depends on (CPU_V6 || CPU_V7 || XSCALE_PMU) && \
1007 (!ARCH_OMAP3 || OMAP3_EMU)
1012 source "arch/arm/Kconfig-nommu"
1015 config ARM_ERRATA_411920
1016 bool "ARM errata: Invalidation of the Instruction Cache operation can fail"
1017 depends on CPU_V6 && !SMP
1019 Invalidation of the Instruction Cache operation can
1020 fail. This erratum is present in 1136 (before r1p4), 1156 and 1176.
1021 It does not affect the MPCore. This option enables the ARM Ltd.
1022 recommended workaround.
1024 config ARM_ERRATA_430973
1025 bool "ARM errata: Stale prediction on replaced interworking branch"
1028 This option enables the workaround for the 430973 Cortex-A8
1029 (r1p0..r1p2) erratum. If a code sequence containing an ARM/Thumb
1030 interworking branch is replaced with another code sequence at the
1031 same virtual address, whether due to self-modifying code or virtual
1032 to physical address re-mapping, Cortex-A8 does not recover from the
1033 stale interworking branch prediction. This results in Cortex-A8
1034 executing the new code sequence in the incorrect ARM or Thumb state.
1035 The workaround enables the BTB/BTAC operations by setting ACTLR.IBE
1036 and also flushes the branch target cache at every context switch.
1037 Note that setting specific bits in the ACTLR register may not be
1038 available in non-secure mode.
1040 config ARM_ERRATA_458693
1041 bool "ARM errata: Processor deadlock when a false hazard is created"
1044 This option enables the workaround for the 458693 Cortex-A8 (r2p0)
1045 erratum. For very specific sequences of memory operations, it is
1046 possible for a hazard condition intended for a cache line to instead
1047 be incorrectly associated with a different cache line. This false
1048 hazard might then cause a processor deadlock. The workaround enables
1049 the L1 caching of the NEON accesses and disables the PLD instruction
1050 in the ACTLR register. Note that setting specific bits in the ACTLR
1051 register may not be available in non-secure mode.
1053 config ARM_ERRATA_460075
1054 bool "ARM errata: Data written to the L2 cache can be overwritten with stale data"
1057 This option enables the workaround for the 460075 Cortex-A8 (r2p0)
1058 erratum. Any asynchronous access to the L2 cache may encounter a
1059 situation in which recent store transactions to the L2 cache are lost
1060 and overwritten with stale memory contents from external memory. The
1061 workaround disables the write-allocate mode for the L2 cache via the
1062 ACTLR register. Note that setting specific bits in the ACTLR register
1063 may not be available in non-secure mode.
1065 config PL310_ERRATA_588369
1066 bool "Clean & Invalidate maintenance operations do not invalidate clean lines"
1067 depends on CACHE_L2X0 && ARCH_OMAP4
1069 The PL310 L2 cache controller implements three types of Clean &
1070 Invalidate maintenance operations: by Physical Address
1071 (offset 0x7F0), by Index/Way (0x7F8) and by Way (0x7FC).
1072 They are architecturally defined to behave as the execution of a
1073 clean operation followed immediately by an invalidate operation,
1074 both performing to the same memory location. This functionality
1075 is not correctly implemented in PL310 as clean lines are not
1076 invalidated as a result of these operations. Note that this errata
1077 uses Texas Instrument's secure monitor api.
1079 config ARM_ERRATA_720789
1080 bool "ARM errata: TLBIASIDIS and TLBIMVAIS operations can broadcast a faulty ASID"
1081 depends on CPU_V7 && SMP
1083 This option enables the workaround for the 720789 Cortex-A9 (prior to
1084 r2p0) erratum. A faulty ASID can be sent to the other CPUs for the
1085 broadcasted CP15 TLB maintenance operations TLBIASIDIS and TLBIMVAIS.
1086 As a consequence of this erratum, some TLB entries which should be
1087 invalidated are not, resulting in an incoherency in the system page
1088 tables. The workaround changes the TLB flushing routines to invalidate
1089 entries regardless of the ASID.
1092 source "arch/arm/common/Kconfig"
1102 Find out whether you have ISA slots on your motherboard. ISA is the
1103 name of a bus system, i.e. the way the CPU talks to the other stuff
1104 inside your box. Other bus systems are PCI, EISA, MicroChannel
1105 (MCA) or VESA. ISA is an older system, now being displaced by PCI;
1106 newer boards don't support it. If you have ISA, say Y, otherwise N.
1108 # Select ISA DMA controller support
1113 # Select ISA DMA interface
1118 bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB || ARCH_IXP4XX || ARCH_KS8695 || MACH_ARMCORE || ARCH_CNS3XXX
1120 Find out whether you have a PCI motherboard. PCI is the name of a
1121 bus system, i.e. the way the CPU talks to the other stuff inside
1122 your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
1123 VESA. If you have PCI, say Y, otherwise N.
1132 # Select the host bridge type
1133 config PCI_HOST_VIA82C505
1135 depends on PCI && ARCH_SHARK
1138 config PCI_HOST_ITE8152
1140 depends on PCI && MACH_ARMCORE
1144 source "drivers/pci/Kconfig"
1146 source "drivers/pcmcia/Kconfig"
1150 menu "Kernel Features"
1152 source "kernel/time/Kconfig"
1155 bool "Symmetric Multi-Processing (EXPERIMENTAL)"
1156 depends on EXPERIMENTAL && (REALVIEW_EB_ARM11MP || REALVIEW_EB_A9MP ||\
1157 MACH_REALVIEW_PB11MP || MACH_REALVIEW_PBX || ARCH_OMAP4 ||\
1158 ARCH_S5PV310 || ARCH_TEGRA || ARCH_U8500 || ARCH_VEXPRESS_CA9X4)
1159 depends on GENERIC_CLOCKEVENTS
1160 select USE_GENERIC_SMP_HELPERS
1161 select HAVE_ARM_SCU if ARCH_REALVIEW || ARCH_OMAP4 || ARCH_S5PV310 ||\
1162 ARCH_TEGRA || ARCH_U8500 || ARCH_VEXPRESS_CA9X4
1164 This enables support for systems with more than one CPU. If you have
1165 a system with only one CPU, like most personal computers, say N. If
1166 you have a system with more than one CPU, say Y.
1168 If you say N here, the kernel will run on single and multiprocessor
1169 machines, but will use only one CPU of a multiprocessor machine. If
1170 you say Y here, the kernel will run on many, but not all, single
1171 processor machines. On a single processor machine, the kernel will
1172 run faster if you say N here.
1174 See also <file:Documentation/i386/IO-APIC.txt>,
1175 <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at
1176 <http://www.linuxdoc.org/docs.html#howto>.
1178 If you don't know what to do here, say N.
1184 This option enables support for the ARM system coherency unit
1190 This options enables support for the ARM timer and watchdog unit
1193 prompt "Memory split"
1196 Select the desired split between kernel and user memory.
1198 If you are not absolutely sure what you are doing, leave this
1202 bool "3G/1G user/kernel split"
1204 bool "2G/2G user/kernel split"
1206 bool "1G/3G user/kernel split"
1211 default 0x40000000 if VMSPLIT_1G
1212 default 0x80000000 if VMSPLIT_2G
1216 int "Maximum number of CPUs (2-32)"
1222 bool "Support for hot-pluggable CPUs (EXPERIMENTAL)"
1223 depends on SMP && HOTPLUG && EXPERIMENTAL
1225 Say Y here to experiment with turning CPUs off and on. CPUs
1226 can be controlled through /sys/devices/system/cpu.
1229 bool "Use local timer interrupts"
1230 depends on SMP && (REALVIEW_EB_ARM11MP || MACH_REALVIEW_PB11MP || \
1231 REALVIEW_EB_A9MP || MACH_REALVIEW_PBX || ARCH_OMAP4 || \
1232 ARCH_S5PV310 || ARCH_TEGRA || ARCH_U8500 || ARCH_VEXPRESS_CA9X4)
1234 select HAVE_ARM_TWD if ARCH_REALVIEW || ARCH_OMAP4 || ARCH_S5PV310 || \
1235 ARCH_TEGRA || ARCH_U8500 || ARCH_VEXPRESS
1237 Enable support for local timers on SMP platforms, rather then the
1238 legacy IPI broadcast method. Local timers allows the system
1239 accounting to be spread across the timer interval, preventing a
1240 "thundering herd" at every timer tick.
1242 source kernel/Kconfig.preempt
1246 default 200 if ARCH_EBSA110 || ARCH_S3C2410 || ARCH_S5P6440 || \
1247 ARCH_S5P6442 || ARCH_S5PV210 || ARCH_S5PV310
1248 default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER
1249 default AT91_TIMER_HZ if ARCH_AT91
1250 default SHMOBILE_TIMER_HZ if ARCH_SHMOBILE
1253 config THUMB2_KERNEL
1254 bool "Compile the kernel in Thumb-2 mode"
1255 depends on CPU_V7 && EXPERIMENTAL
1257 select ARM_ASM_UNIFIED
1259 By enabling this option, the kernel will be compiled in
1260 Thumb-2 mode. A compiler/assembler that understand the unified
1261 ARM-Thumb syntax is needed.
1265 config ARM_ASM_UNIFIED
1269 bool "Use the ARM EABI to compile the kernel"
1271 This option allows for the kernel to be compiled using the latest
1272 ARM ABI (aka EABI). This is only useful if you are using a user
1273 space environment that is also compiled with EABI.
1275 Since there are major incompatibilities between the legacy ABI and
1276 EABI, especially with regard to structure member alignment, this
1277 option also changes the kernel syscall calling convention to
1278 disambiguate both ABIs and allow for backward compatibility support
1279 (selected with CONFIG_OABI_COMPAT).
1281 To use this you need GCC version 4.0.0 or later.
1284 bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)"
1285 depends on AEABI && EXPERIMENTAL
1288 This option preserves the old syscall interface along with the
1289 new (ARM EABI) one. It also provides a compatibility layer to
1290 intercept syscalls that have structure arguments which layout
1291 in memory differs between the legacy ABI and the new ARM EABI
1292 (only for non "thumb" binaries). This option adds a tiny
1293 overhead to all syscalls and produces a slightly larger kernel.
1294 If you know you'll be using only pure EABI user space then you
1295 can say N here. If this option is not selected and you attempt
1296 to execute a legacy ABI binary then the result will be
1297 UNPREDICTABLE (in fact it can be predicted that it won't work
1298 at all). If in doubt say Y.
1300 config ARCH_HAS_HOLES_MEMORYMODEL
1303 config ARCH_SPARSEMEM_ENABLE
1306 config ARCH_SPARSEMEM_DEFAULT
1307 def_bool ARCH_SPARSEMEM_ENABLE
1309 config ARCH_SELECT_MEMORY_MODEL
1310 def_bool ARCH_SPARSEMEM_ENABLE
1313 bool "High Memory Support (EXPERIMENTAL)"
1314 depends on MMU && EXPERIMENTAL
1316 The address space of ARM processors is only 4 Gigabytes large
1317 and it has to accommodate user address space, kernel address
1318 space as well as some memory mapped IO. That means that, if you
1319 have a large amount of physical memory and/or IO, not all of the
1320 memory can be "permanently mapped" by the kernel. The physical
1321 memory that is not permanently mapped is called "high memory".
1323 Depending on the selected kernel/user memory split, minimum
1324 vmalloc space and actual amount of RAM, you may not need this
1325 option which should result in a slightly faster kernel.
1330 bool "Allocate 2nd-level pagetables from highmem"
1332 depends on !OUTER_CACHE
1334 config HW_PERF_EVENTS
1335 bool "Enable hardware performance counter support for perf events"
1336 depends on PERF_EVENTS && CPU_HAS_PMU
1339 Enable hardware performance counter support for perf events. If
1340 disabled, perf events will use software events only.
1345 This enables support for sparse irqs. This is useful in general
1346 as most CPUs have a fairly sparse array of IRQ vectors, which
1347 the irq_desc then maps directly on to. Systems with a high
1348 number of off-chip IRQs will want to treat this as
1349 experimental until they have been independently verified.
1353 config FORCE_MAX_ZONEORDER
1354 int "Maximum zone order" if ARCH_SHMOBILE
1355 range 11 64 if ARCH_SHMOBILE
1356 default "9" if SA1111
1359 The kernel memory allocator divides physically contiguous memory
1360 blocks into "zones", where each zone is a power of two number of
1361 pages. This option selects the largest power of two that the kernel
1362 keeps in the memory allocator. If you need to allocate very large
1363 blocks of physically contiguous memory, then you may need to
1364 increase this value.
1366 This config option is actually maximum order plus one. For example,
1367 a value of 11 means that the largest free memory block is 2^10 pages.
1370 bool "Timer and CPU usage LEDs"
1371 depends on ARCH_CDB89712 || ARCH_EBSA110 || \
1372 ARCH_EBSA285 || ARCH_INTEGRATOR || \
1373 ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \
1374 ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \
1375 ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \
1376 ARCH_AT91 || ARCH_DAVINCI || \
1377 ARCH_KS8695 || MACH_RD88F5182 || ARCH_REALVIEW
1379 If you say Y here, the LEDs on your machine will be used
1380 to provide useful information about your current system status.
1382 If you are compiling a kernel for a NetWinder or EBSA-285, you will
1383 be able to select which LEDs are active using the options below. If
1384 you are compiling a kernel for the EBSA-110 or the LART however, the
1385 red LED will simply flash regularly to indicate that the system is
1386 still functional. It is safe to say Y here if you have a CATS
1387 system, but the driver will do nothing.
1390 bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \
1391 OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1392 || MACH_OMAP_PERSEUS2
1394 depends on !GENERIC_CLOCKEVENTS
1395 default y if ARCH_EBSA110
1397 If you say Y here, one of the system LEDs (the green one on the
1398 NetWinder, the amber one on the EBSA285, or the red one on the LART)
1399 will flash regularly to indicate that the system is still
1400 operational. This is mainly useful to kernel hackers who are
1401 debugging unstable kernels.
1403 The LART uses the same LED for both Timer LED and CPU usage LED
1404 functions. You may choose to use both, but the Timer LED function
1405 will overrule the CPU usage LED.
1408 bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \
1410 || OMAP_OSK_MISTRAL || MACH_OMAP_H2 \
1411 || MACH_OMAP_PERSEUS2
1414 If you say Y here, the red LED will be used to give a good real
1415 time indication of CPU usage, by lighting whenever the idle task
1416 is not currently executing.
1418 The LART uses the same LED for both Timer LED and CPU usage LED
1419 functions. You may choose to use both, but the Timer LED function
1420 will overrule the CPU usage LED.
1422 config ALIGNMENT_TRAP
1424 depends on CPU_CP15_MMU
1425 default y if !ARCH_EBSA110
1426 select HAVE_PROC_CPU if PROC_FS
1428 ARM processors cannot fetch/store information which is not
1429 naturally aligned on the bus, i.e., a 4 byte fetch must start at an
1430 address divisible by 4. On 32-bit ARM processors, these non-aligned
1431 fetch/store instructions will be emulated in software if you say
1432 here, which has a severe performance impact. This is necessary for
1433 correct operation of some network protocols. With an IP-only
1434 configuration it is safe to say N, otherwise say Y.
1436 config UACCESS_WITH_MEMCPY
1437 bool "Use kernel mem{cpy,set}() for {copy_to,clear}_user() (EXPERIMENTAL)"
1438 depends on MMU && EXPERIMENTAL
1439 default y if CPU_FEROCEON
1441 Implement faster copy_to_user and clear_user methods for CPU
1442 cores where a 8-word STM instruction give significantly higher
1443 memory write throughput than a sequence of individual 32bit stores.
1445 A possible side effect is a slight increase in scheduling latency
1446 between threads sharing the same address space if they invoke
1447 such copy operations with large buffers.
1449 However, if the CPU data cache is using a write-allocate mode,
1450 this option is unlikely to provide any performance gain.
1452 config CC_STACKPROTECTOR
1453 bool "Enable -fstack-protector buffer overflow detection (EXPERIMENTAL)"
1455 This option turns on the -fstack-protector GCC feature. This
1456 feature puts, at the beginning of functions, a canary value on
1457 the stack just before the return address, and validates
1458 the value just before actually returning. Stack based buffer
1459 overflows (that need to overwrite this return address) now also
1460 overwrite the canary, which gets detected and the attack is then
1461 neutralized via a kernel panic.
1462 This feature requires gcc version 4.2 or above.
1464 config DEPRECATED_PARAM_STRUCT
1465 bool "Provide old way to pass kernel parameters"
1467 This was deprecated in 2001 and announced to live on for 5 years.
1468 Some old boot loaders still use this way.
1474 # Compressed boot loader in ROM. Yes, we really want to ask about
1475 # TEXT and BSS so we preserve their values in the config files.
1476 config ZBOOT_ROM_TEXT
1477 hex "Compressed ROM boot loader base address"
1480 The physical address at which the ROM-able zImage is to be
1481 placed in the target. Platforms which normally make use of
1482 ROM-able zImage formats normally set this to a suitable
1483 value in their defconfig file.
1485 If ZBOOT_ROM is not enabled, this has no effect.
1487 config ZBOOT_ROM_BSS
1488 hex "Compressed ROM boot loader BSS address"
1491 The base address of an area of read/write memory in the target
1492 for the ROM-able zImage which must be available while the
1493 decompressor is running. It must be large enough to hold the
1494 entire decompressed kernel plus an additional 128 KiB.
1495 Platforms which normally make use of ROM-able zImage formats
1496 normally set this to a suitable value in their defconfig file.
1498 If ZBOOT_ROM is not enabled, this has no effect.
1501 bool "Compressed boot loader in ROM/flash"
1502 depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS
1504 Say Y here if you intend to execute your compressed kernel image
1505 (zImage) directly from ROM or flash. If unsure, say N.
1508 string "Default kernel command string"
1511 On some architectures (EBSA110 and CATS), there is currently no way
1512 for the boot loader to pass arguments to the kernel. For these
1513 architectures, you should supply some command-line options at build
1514 time by entering them here. As a minimum, you should specify the
1515 memory size and the root device (e.g., mem=64M root=/dev/nfs).
1517 config CMDLINE_FORCE
1518 bool "Always use the default kernel command string"
1519 depends on CMDLINE != ""
1521 Always use the default kernel command string, even if the boot
1522 loader passes other arguments to the kernel.
1523 This is useful if you cannot or don't want to change the
1524 command-line options your boot loader passes to the kernel.
1529 bool "Kernel Execute-In-Place from ROM"
1530 depends on !ZBOOT_ROM
1532 Execute-In-Place allows the kernel to run from non-volatile storage
1533 directly addressable by the CPU, such as NOR flash. This saves RAM
1534 space since the text section of the kernel is not loaded from flash
1535 to RAM. Read-write sections, such as the data section and stack,
1536 are still copied to RAM. The XIP kernel is not compressed since
1537 it has to run directly from flash, so it will take more space to
1538 store it. The flash address used to link the kernel object files,
1539 and for storing it, is configuration dependent. Therefore, if you
1540 say Y here, you must know the proper physical address where to
1541 store the kernel image depending on your own flash memory usage.
1543 Also note that the make target becomes "make xipImage" rather than
1544 "make zImage" or "make Image". The final kernel binary to put in
1545 ROM memory will be arch/arm/boot/xipImage.
1549 config XIP_PHYS_ADDR
1550 hex "XIP Kernel Physical Location"
1551 depends on XIP_KERNEL
1552 default "0x00080000"
1554 This is the physical address in your flash memory the kernel will
1555 be linked for and stored to. This address is dependent on your
1559 bool "Kexec system call (EXPERIMENTAL)"
1560 depends on EXPERIMENTAL
1562 kexec is a system call that implements the ability to shutdown your
1563 current kernel, and to start another kernel. It is like a reboot
1564 but it is independent of the system firmware. And like a reboot
1565 you can start any kernel with it, not just Linux.
1567 It is an ongoing process to be certain the hardware in a machine
1568 is properly shutdown, so do not be surprised if this code does not
1569 initially work for you. It may help to enable device hotplugging
1573 bool "Export atags in procfs"
1577 Should the atags used to boot the kernel be exported in an "atags"
1578 file in procfs. Useful with kexec.
1580 config AUTO_ZRELADDR
1581 bool "Auto calculation of the decompressed kernel image address"
1582 depends on !ZBOOT_ROM && !ARCH_U300
1584 ZRELADDR is the physical address where the decompressed kernel
1585 image will be placed. If AUTO_ZRELADDR is selected, the address
1586 will be determined at run-time by masking the current IP with
1587 0xf8000000. This assumes the zImage being placed in the first 128MB
1588 from start of memory.
1592 menu "CPU Power Management"
1596 source "drivers/cpufreq/Kconfig"
1598 config CPU_FREQ_SA1100
1601 config CPU_FREQ_SA1110
1604 config CPU_FREQ_INTEGRATOR
1605 tristate "CPUfreq driver for ARM Integrator CPUs"
1606 depends on ARCH_INTEGRATOR && CPU_FREQ
1609 This enables the CPUfreq driver for ARM Integrator CPUs.
1611 For details, take a look at <file:Documentation/cpu-freq>.
1617 depends on CPU_FREQ && ARCH_PXA && PXA25x
1619 select CPU_FREQ_DEFAULT_GOV_USERSPACE
1621 config CPU_FREQ_S3C64XX
1622 bool "CPUfreq support for Samsung S3C64XX CPUs"
1623 depends on CPU_FREQ && CPU_S3C6410
1628 Internal configuration node for common cpufreq on Samsung SoC
1630 config CPU_FREQ_S3C24XX
1631 bool "CPUfreq driver for Samsung S3C24XX series CPUs"
1632 depends on ARCH_S3C2410 && CPU_FREQ && EXPERIMENTAL
1635 This enables the CPUfreq driver for the Samsung S3C24XX family
1638 For details, take a look at <file:Documentation/cpu-freq>.
1642 config CPU_FREQ_S3C24XX_PLL
1643 bool "Support CPUfreq changing of PLL frequency"
1644 depends on CPU_FREQ_S3C24XX && EXPERIMENTAL
1646 Compile in support for changing the PLL frequency from the
1647 S3C24XX series CPUfreq driver. The PLL takes time to settle
1648 after a frequency change, so by default it is not enabled.
1650 This also means that the PLL tables for the selected CPU(s) will
1651 be built which may increase the size of the kernel image.
1653 config CPU_FREQ_S3C24XX_DEBUG
1654 bool "Debug CPUfreq Samsung driver core"
1655 depends on CPU_FREQ_S3C24XX
1657 Enable s3c_freq_dbg for the Samsung S3C CPUfreq core
1659 config CPU_FREQ_S3C24XX_IODEBUG
1660 bool "Debug CPUfreq Samsung driver IO timing"
1661 depends on CPU_FREQ_S3C24XX
1663 Enable s3c_freq_iodbg for the Samsung S3C CPUfreq core
1665 config CPU_FREQ_S3C24XX_DEBUGFS
1666 bool "Export debugfs for CPUFreq"
1667 depends on CPU_FREQ_S3C24XX && DEBUG_FS
1669 Export status information via debugfs.
1673 source "drivers/cpuidle/Kconfig"
1677 menu "Floating point emulation"
1679 comment "At least one emulation must be selected"
1682 bool "NWFPE math emulation"
1683 depends on !AEABI || OABI_COMPAT
1685 Say Y to include the NWFPE floating point emulator in the kernel.
1686 This is necessary to run most binaries. Linux does not currently
1687 support floating point hardware so you need to say Y here even if
1688 your machine has an FPA or floating point co-processor podule.
1690 You may say N here if you are going to load the Acorn FPEmulator
1691 early in the bootup.
1694 bool "Support extended precision"
1695 depends on FPE_NWFPE
1697 Say Y to include 80-bit support in the kernel floating-point
1698 emulator. Otherwise, only 32 and 64-bit support is compiled in.
1699 Note that gcc does not generate 80-bit operations by default,
1700 so in most cases this option only enlarges the size of the
1701 floating point emulator without any good reason.
1703 You almost surely want to say N here.
1706 bool "FastFPE math emulation (EXPERIMENTAL)"
1707 depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL
1709 Say Y here to include the FAST floating point emulator in the kernel.
1710 This is an experimental much faster emulator which now also has full
1711 precision for the mantissa. It does not support any exceptions.
1712 It is very simple, and approximately 3-6 times faster than NWFPE.
1714 It should be sufficient for most programs. It may be not suitable
1715 for scientific calculations, but you have to check this for yourself.
1716 If you do not feel you need a faster FP emulation you should better
1720 bool "VFP-format floating point maths"
1721 depends on CPU_V6 || CPU_ARM926T || CPU_V7 || CPU_FEROCEON
1723 Say Y to include VFP support code in the kernel. This is needed
1724 if your hardware includes a VFP unit.
1726 Please see <file:Documentation/arm/VFP/release-notes.txt> for
1727 release notes and additional status information.
1729 Say N if your target does not have VFP hardware.
1737 bool "Advanced SIMD (NEON) Extension support"
1738 depends on VFPv3 && CPU_V7
1740 Say Y to include support code for NEON, the ARMv7 Advanced SIMD
1745 menu "Userspace binary formats"
1747 source "fs/Kconfig.binfmt"
1750 tristate "RISC OS personality"
1753 Say Y here to include the kernel code necessary if you want to run
1754 Acorn RISC OS/Arthur binaries under Linux. This code is still very
1755 experimental; if this sounds frightening, say N and sleep in peace.
1756 You can also say M here to compile this support as a module (which
1757 will be called arthur).
1761 menu "Power management options"
1763 source "kernel/power/Kconfig"
1765 config ARCH_SUSPEND_POSSIBLE
1770 source "net/Kconfig"
1772 source "drivers/Kconfig"
1776 source "arch/arm/Kconfig.debug"
1778 source "security/Kconfig"
1780 source "crypto/Kconfig"
1782 source "lib/Kconfig"