11da177e4SLinus Torvalds# 21da177e4SLinus Torvalds# For a description of the syntax of this configuration file, 31da177e4SLinus Torvalds# see Documentation/kbuild/kconfig-language.txt. 41da177e4SLinus Torvalds# 51da177e4SLinus Torvalds 61da177e4SLinus Torvaldsmainmenu "Linux Kernel Configuration" 71da177e4SLinus Torvalds 81da177e4SLinus Torvaldsconfig ARM 91da177e4SLinus Torvalds bool 101da177e4SLinus Torvalds default y 11*12b824fbSAlessandro Zummo select RTC_LIB 121da177e4SLinus Torvalds help 131da177e4SLinus Torvalds The ARM series is a line of low-power-consumption RISC chip designs 14f6c8965aSMartin Michlmayr licensed by ARM Ltd and targeted at embedded applications and 151da177e4SLinus Torvalds handhelds such as the Compaq IPAQ. ARM-based PCs are no longer 161da177e4SLinus Torvalds manufactured, but legacy ARM-based PC hardware remains popular in 171da177e4SLinus Torvalds Europe. There is an ARM Linux project with a web page at 181da177e4SLinus Torvalds <http://www.arm.linux.org.uk/>. 191da177e4SLinus Torvalds 201da177e4SLinus Torvaldsconfig MMU 211da177e4SLinus Torvalds bool 221da177e4SLinus Torvalds default y 231da177e4SLinus Torvalds 241da177e4SLinus Torvaldsconfig EISA 251da177e4SLinus Torvalds bool 261da177e4SLinus Torvalds ---help--- 271da177e4SLinus Torvalds The Extended Industry Standard Architecture (EISA) bus was 281da177e4SLinus Torvalds developed as an open alternative to the IBM MicroChannel bus. 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds The EISA bus provided some of the features of the IBM MicroChannel 311da177e4SLinus Torvalds bus while maintaining backward compatibility with cards made for 321da177e4SLinus Torvalds the older ISA bus. The EISA bus saw limited use between 1988 and 331da177e4SLinus Torvalds 1995 when it was made obsolete by the PCI bus. 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds Say Y here if you are building a kernel for an EISA-based machine. 361da177e4SLinus Torvalds 371da177e4SLinus Torvalds Otherwise, say N. 381da177e4SLinus Torvalds 391da177e4SLinus Torvaldsconfig SBUS 401da177e4SLinus Torvalds bool 411da177e4SLinus Torvalds 421da177e4SLinus Torvaldsconfig MCA 431da177e4SLinus Torvalds bool 441da177e4SLinus Torvalds help 451da177e4SLinus Torvalds MicroChannel Architecture is found in some IBM PS/2 machines and 461da177e4SLinus Torvalds laptops. It is a bus system similar to PCI or ISA. See 471da177e4SLinus Torvalds <file:Documentation/mca.txt> (and especially the web page given 481da177e4SLinus Torvalds there) before attempting to build an MCA bus kernel. 491da177e4SLinus Torvalds 501da177e4SLinus Torvaldsconfig RWSEM_GENERIC_SPINLOCK 511da177e4SLinus Torvalds bool 521da177e4SLinus Torvalds default y 531da177e4SLinus Torvalds 541da177e4SLinus Torvaldsconfig RWSEM_XCHGADD_ALGORITHM 551da177e4SLinus Torvalds bool 561da177e4SLinus Torvalds 57b89c3b16SAkinobu Mitaconfig GENERIC_HWEIGHT 58b89c3b16SAkinobu Mita bool 59b89c3b16SAkinobu Mita default y 60b89c3b16SAkinobu Mita 611da177e4SLinus Torvaldsconfig GENERIC_CALIBRATE_DELAY 621da177e4SLinus Torvalds bool 631da177e4SLinus Torvalds default y 641da177e4SLinus Torvalds 651da177e4SLinus Torvaldsconfig GENERIC_BUST_SPINLOCK 661da177e4SLinus Torvalds bool 671da177e4SLinus Torvalds 68a08b6b79Sviro@ZenIV.linux.org.ukconfig ARCH_MAY_HAVE_PC_FDC 69a08b6b79Sviro@ZenIV.linux.org.uk bool 70a08b6b79Sviro@ZenIV.linux.org.uk 711da177e4SLinus Torvaldsconfig GENERIC_ISA_DMA 721da177e4SLinus Torvalds bool 731da177e4SLinus Torvalds 741da177e4SLinus Torvaldsconfig FIQ 751da177e4SLinus Torvalds bool 761da177e4SLinus Torvalds 77034d2f5aSAl Viroconfig ARCH_MTD_XIP 78034d2f5aSAl Viro bool 79034d2f5aSAl Viro 801da177e4SLinus Torvaldssource "init/Kconfig" 811da177e4SLinus Torvalds 821da177e4SLinus Torvaldsmenu "System Type" 831da177e4SLinus Torvalds 841da177e4SLinus Torvaldschoice 851da177e4SLinus Torvalds prompt "ARM system type" 866a0e2430SCatalin Marinas default ARCH_VERSATILE 871da177e4SLinus Torvalds 881da177e4SLinus Torvaldsconfig ARCH_CLPS7500 891da177e4SLinus Torvalds bool "Cirrus-CL-PS7500FE" 901da177e4SLinus Torvalds select TIMER_ACORN 91f7e68bbfSRussell King select ISA 92f999b8bdSMartin Michlmayr help 93f999b8bdSMartin Michlmayr Support for the Cirrus Logic PS7500FE system-on-a-chip. 941da177e4SLinus Torvalds 951da177e4SLinus Torvaldsconfig ARCH_CLPS711X 961da177e4SLinus Torvalds bool "CLPS711x/EP721x-based" 97f999b8bdSMartin Michlmayr help 98f999b8bdSMartin Michlmayr Support for Cirrus Logic 711x/721x based boards. 991da177e4SLinus Torvalds 1001da177e4SLinus Torvaldsconfig ARCH_CO285 1011da177e4SLinus Torvalds bool "Co-EBSA285" 1021da177e4SLinus Torvalds select FOOTBRIDGE 1031da177e4SLinus Torvalds select FOOTBRIDGE_ADDIN 104f999b8bdSMartin Michlmayr help 105f999b8bdSMartin Michlmayr Support for Intel's EBSA285 companion chip. 1061da177e4SLinus Torvalds 1071da177e4SLinus Torvaldsconfig ARCH_EBSA110 1081da177e4SLinus Torvalds bool "EBSA-110" 109f7e68bbfSRussell King select ISA 1101da177e4SLinus Torvalds help 1111da177e4SLinus Torvalds This is an evaluation board for the StrongARM processor available 112f6c8965aSMartin Michlmayr from Digital. It has limited hardware on-board, including an 1131da177e4SLinus Torvalds Ethernet interface, two PCMCIA sockets, two serial ports and a 1141da177e4SLinus Torvalds parallel port. 1151da177e4SLinus Torvalds 116e7736d47SLennert Buytenhekconfig ARCH_EP93XX 117e7736d47SLennert Buytenhek bool "EP93xx-based" 118e7736d47SLennert Buytenhek select ARM_AMBA 119e7736d47SLennert Buytenhek select ARM_VIC 120e7736d47SLennert Buytenhek help 121e7736d47SLennert Buytenhek This enables support for the Cirrus EP93xx series of CPUs. 122e7736d47SLennert Buytenhek 1231da177e4SLinus Torvaldsconfig ARCH_FOOTBRIDGE 1241da177e4SLinus Torvalds bool "FootBridge" 1251da177e4SLinus Torvalds select FOOTBRIDGE 126f999b8bdSMartin Michlmayr help 127f999b8bdSMartin Michlmayr Support for systems based on the DC21285 companion chip 128f999b8bdSMartin Michlmayr ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder. 1291da177e4SLinus Torvalds 1301da177e4SLinus Torvaldsconfig ARCH_INTEGRATOR 1311da177e4SLinus Torvalds bool "Integrator" 1321da177e4SLinus Torvalds select ARM_AMBA 1331da177e4SLinus Torvalds select ICST525 134f999b8bdSMartin Michlmayr help 135f999b8bdSMartin Michlmayr Support for ARM's Integrator platform. 1361da177e4SLinus Torvalds 1371da177e4SLinus Torvaldsconfig ARCH_IOP3XX 1381da177e4SLinus Torvalds bool "IOP3xx-based" 139f7e68bbfSRussell King select PCI 140f999b8bdSMartin Michlmayr help 141f999b8bdSMartin Michlmayr Support for Intel's IOP3XX (XScale) family of processors. 1421da177e4SLinus Torvalds 1431da177e4SLinus Torvaldsconfig ARCH_IXP4XX 1441da177e4SLinus Torvalds bool "IXP4xx-based" 1451da177e4SLinus Torvalds select DMABOUNCE 146f7e68bbfSRussell King select PCI 147f999b8bdSMartin Michlmayr help 148f999b8bdSMartin Michlmayr Support for Intel's IXP4XX (XScale) family of processors. 1491da177e4SLinus Torvalds 1501da177e4SLinus Torvaldsconfig ARCH_IXP2000 1511da177e4SLinus Torvalds bool "IXP2400/2800-based" 152f7e68bbfSRussell King select PCI 153f999b8bdSMartin Michlmayr help 154f999b8bdSMartin Michlmayr Support for Intel's IXP2400/2800 (XScale) family of processors. 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvaldsconfig ARCH_L7200 1571da177e4SLinus Torvalds bool "LinkUp-L7200" 1581da177e4SLinus Torvalds select FIQ 1591da177e4SLinus Torvalds help 1601da177e4SLinus Torvalds Say Y here if you intend to run this kernel on a LinkUp Systems 1611da177e4SLinus Torvalds L7200 Software Development Board which uses an ARM720T processor. 1621da177e4SLinus Torvalds Information on this board can be obtained at: 1631da177e4SLinus Torvalds 1641da177e4SLinus Torvalds <http://www.linkupsys.com/> 1651da177e4SLinus Torvalds 1661da177e4SLinus Torvalds If you have any questions or comments about the Linux kernel port 1671da177e4SLinus Torvalds to this board, send e-mail to <sjhill@cotw.com>. 1681da177e4SLinus Torvalds 1691da177e4SLinus Torvaldsconfig ARCH_PXA 1701da177e4SLinus Torvalds bool "PXA2xx-based" 171034d2f5aSAl Viro select ARCH_MTD_XIP 172f999b8bdSMartin Michlmayr help 173f999b8bdSMartin Michlmayr Support for Intel's PXA2XX processor line. 1741da177e4SLinus Torvalds 1751da177e4SLinus Torvaldsconfig ARCH_RPC 1761da177e4SLinus Torvalds bool "RiscPC" 1771da177e4SLinus Torvalds select ARCH_ACORN 1781da177e4SLinus Torvalds select FIQ 1791da177e4SLinus Torvalds select TIMER_ACORN 180a08b6b79Sviro@ZenIV.linux.org.uk select ARCH_MAY_HAVE_PC_FDC 181065909b9SRussell King select ISA_DMA_API 1821da177e4SLinus Torvalds help 1831da177e4SLinus Torvalds On the Acorn Risc-PC, Linux can support the internal IDE disk and 1841da177e4SLinus Torvalds CD-ROM interface, serial and parallel port, and the floppy drive. 1851da177e4SLinus Torvalds 1861da177e4SLinus Torvaldsconfig ARCH_SA1100 1871da177e4SLinus Torvalds bool "SA1100-based" 188f7e68bbfSRussell King select ISA 1893cd9e19eSRussell King select ARCH_DISCONTIGMEM_ENABLE 190034d2f5aSAl Viro select ARCH_MTD_XIP 191f999b8bdSMartin Michlmayr help 192f999b8bdSMartin Michlmayr Support for StrongARM 11x0 based boards. 1931da177e4SLinus Torvalds 1941da177e4SLinus Torvaldsconfig ARCH_S3C2410 1951da177e4SLinus Torvalds bool "Samsung S3C2410" 1961da177e4SLinus Torvalds help 1971da177e4SLinus Torvalds Samsung S3C2410X CPU based systems, such as the Simtec Electronics 1981da177e4SLinus Torvalds BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or 199f6c8965aSMartin Michlmayr the Samsung SMDK2410 development board (and derivatives). 2001da177e4SLinus Torvalds 2011da177e4SLinus Torvaldsconfig ARCH_SHARK 2021da177e4SLinus Torvalds bool "Shark" 203f7e68bbfSRussell King select ISA 204f7e68bbfSRussell King select ISA_DMA 205f7e68bbfSRussell King select PCI 206f999b8bdSMartin Michlmayr help 207f999b8bdSMartin Michlmayr Support for the StrongARM based Digital DNARD machine, also known 208f999b8bdSMartin Michlmayr as "Shark" (<http://www.shark-linux.de/shark.html>). 2091da177e4SLinus Torvalds 2101da177e4SLinus Torvaldsconfig ARCH_LH7A40X 2111da177e4SLinus Torvalds bool "Sharp LH7A40X" 2121da177e4SLinus Torvalds help 2131da177e4SLinus Torvalds Say Y here for systems based on one of the Sharp LH7A40X 2141da177e4SLinus Torvalds System on a Chip processors. These CPUs include an ARM922T 2151da177e4SLinus Torvalds core with a wide array of integrated devices for 2161da177e4SLinus Torvalds hand-held and low-power applications. 2171da177e4SLinus Torvalds 2181da177e4SLinus Torvaldsconfig ARCH_OMAP 2191da177e4SLinus Torvalds bool "TI OMAP" 220f999b8bdSMartin Michlmayr help 221f999b8bdSMartin Michlmayr Support for TI's OMAP platform (OMAP1 and OMAP2). 2221da177e4SLinus Torvalds 2231da177e4SLinus Torvaldsconfig ARCH_VERSATILE 2241da177e4SLinus Torvalds bool "Versatile" 2251da177e4SLinus Torvalds select ARM_AMBA 226fa0fe48fSRussell King select ARM_VIC 2271da177e4SLinus Torvalds select ICST307 2281da177e4SLinus Torvalds help 2291da177e4SLinus Torvalds This enables support for ARM Ltd Versatile board. 2301da177e4SLinus Torvalds 2318ad68bbfSCatalin Marinasconfig ARCH_REALVIEW 2328ad68bbfSCatalin Marinas bool "RealView" 2338ad68bbfSCatalin Marinas select ARM_AMBA 2348ad68bbfSCatalin Marinas select ICST307 2358ad68bbfSCatalin Marinas help 2368ad68bbfSCatalin Marinas This enables support for ARM Ltd RealView boards. 2378ad68bbfSCatalin Marinas 2381da177e4SLinus Torvaldsconfig ARCH_IMX 2391da177e4SLinus Torvalds bool "IMX" 240f999b8bdSMartin Michlmayr help 241f999b8bdSMartin Michlmayr Support for Motorola's i.MX family of processors (MX1, MXL). 2421da177e4SLinus Torvalds 2431da177e4SLinus Torvaldsconfig ARCH_H720X 2441da177e4SLinus Torvalds bool "Hynix-HMS720x-based" 245065909b9SRussell King select ISA_DMA_API 2461da177e4SLinus Torvalds help 2471da177e4SLinus Torvalds This enables support for systems based on the Hynix HMS720x 2481da177e4SLinus Torvalds 249038c5b60SBellido Nicolasconfig ARCH_AAEC2000 250038c5b60SBellido Nicolas bool "Agilent AAEC-2000 based" 251049eb329SBellido Nicolas select ARM_AMBA 252038c5b60SBellido Nicolas help 253038c5b60SBellido Nicolas This enables support for systems based on the Agilent AAEC-2000 254038c5b60SBellido Nicolas 25573a59c1cSSAN Peopleconfig ARCH_AT91RM9200 25673a59c1cSSAN People bool "AT91RM9200" 25773a59c1cSSAN People help 258f999b8bdSMartin Michlmayr Say Y here if you intend to run this kernel on an Atmel 259f999b8bdSMartin Michlmayr AT91RM9200-based board. 26073a59c1cSSAN People 2611da177e4SLinus Torvaldsendchoice 2621da177e4SLinus Torvalds 2631da177e4SLinus Torvaldssource "arch/arm/mach-clps711x/Kconfig" 2641da177e4SLinus Torvalds 265e7736d47SLennert Buytenheksource "arch/arm/mach-ep93xx/Kconfig" 266e7736d47SLennert Buytenhek 2671da177e4SLinus Torvaldssource "arch/arm/mach-footbridge/Kconfig" 2681da177e4SLinus Torvalds 2691da177e4SLinus Torvaldssource "arch/arm/mach-integrator/Kconfig" 2701da177e4SLinus Torvalds 2711da177e4SLinus Torvaldssource "arch/arm/mach-iop3xx/Kconfig" 2721da177e4SLinus Torvalds 2731da177e4SLinus Torvaldssource "arch/arm/mach-ixp4xx/Kconfig" 2741da177e4SLinus Torvalds 2751da177e4SLinus Torvaldssource "arch/arm/mach-ixp2000/Kconfig" 2761da177e4SLinus Torvalds 2771da177e4SLinus Torvaldssource "arch/arm/mach-pxa/Kconfig" 2781da177e4SLinus Torvalds 2791da177e4SLinus Torvaldssource "arch/arm/mach-sa1100/Kconfig" 2801da177e4SLinus Torvalds 281d48af15eSTony Lindgrensource "arch/arm/plat-omap/Kconfig" 282d48af15eSTony Lindgren 283d48af15eSTony Lindgrensource "arch/arm/mach-omap1/Kconfig" 2841da177e4SLinus Torvalds 2851dbae815STony Lindgrensource "arch/arm/mach-omap2/Kconfig" 2861dbae815STony Lindgren 2871da177e4SLinus Torvaldssource "arch/arm/mach-s3c2410/Kconfig" 2881da177e4SLinus Torvalds 2891da177e4SLinus Torvaldssource "arch/arm/mach-lh7a40x/Kconfig" 2901da177e4SLinus Torvalds 2911da177e4SLinus Torvaldssource "arch/arm/mach-imx/Kconfig" 2921da177e4SLinus Torvalds 2931da177e4SLinus Torvaldssource "arch/arm/mach-h720x/Kconfig" 2941da177e4SLinus Torvalds 2951da177e4SLinus Torvaldssource "arch/arm/mach-versatile/Kconfig" 2961da177e4SLinus Torvalds 297038c5b60SBellido Nicolassource "arch/arm/mach-aaec2000/Kconfig" 298038c5b60SBellido Nicolas 2998ad68bbfSCatalin Marinassource "arch/arm/mach-realview/Kconfig" 3008ad68bbfSCatalin Marinas 30173a59c1cSSAN Peoplesource "arch/arm/mach-at91rm9200/Kconfig" 30273a59c1cSSAN People 3031da177e4SLinus Torvalds# Definitions to make life easier 3041da177e4SLinus Torvaldsconfig ARCH_ACORN 3051da177e4SLinus Torvalds bool 3061da177e4SLinus Torvalds 3071da177e4SLinus Torvaldssource arch/arm/mm/Kconfig 3081da177e4SLinus Torvalds 3091da177e4SLinus Torvalds# bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER 3101da177e4SLinus Torvaldsconfig XSCALE_PMU 3111da177e4SLinus Torvalds bool 3121da177e4SLinus Torvalds depends on CPU_XSCALE && !XSCALE_PMU_TIMER 3131da177e4SLinus Torvalds default y 3141da177e4SLinus Torvalds 3151da177e4SLinus Torvaldsendmenu 3161da177e4SLinus Torvalds 3171da177e4SLinus Torvaldssource "arch/arm/common/Kconfig" 3181da177e4SLinus Torvalds 3191da177e4SLinus Torvaldsconfig FORCE_MAX_ZONEORDER 3201da177e4SLinus Torvalds int 3211da177e4SLinus Torvalds depends on SA1111 3221da177e4SLinus Torvalds default "9" 3231da177e4SLinus Torvalds 3241da177e4SLinus Torvaldsmenu "Bus support" 3251da177e4SLinus Torvalds 3261da177e4SLinus Torvaldsconfig ARM_AMBA 3271da177e4SLinus Torvalds bool 3281da177e4SLinus Torvalds 3291da177e4SLinus Torvaldsconfig ISA 3301da177e4SLinus Torvalds bool 3311da177e4SLinus Torvalds help 3321da177e4SLinus Torvalds Find out whether you have ISA slots on your motherboard. ISA is the 3331da177e4SLinus Torvalds name of a bus system, i.e. the way the CPU talks to the other stuff 3341da177e4SLinus Torvalds inside your box. Other bus systems are PCI, EISA, MicroChannel 3351da177e4SLinus Torvalds (MCA) or VESA. ISA is an older system, now being displaced by PCI; 3361da177e4SLinus Torvalds newer boards don't support it. If you have ISA, say Y, otherwise N. 3371da177e4SLinus Torvalds 338065909b9SRussell King# Select ISA DMA controller support 3391da177e4SLinus Torvaldsconfig ISA_DMA 3401da177e4SLinus Torvalds bool 341065909b9SRussell King select ISA_DMA_API 3421da177e4SLinus Torvalds 343065909b9SRussell King# Select ISA DMA interface 3445cae841bSAl Viroconfig ISA_DMA_API 3455cae841bSAl Viro bool 3465cae841bSAl Viro 3471da177e4SLinus Torvaldsconfig PCI 348c0da085aSCatalin Marinas bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB 3491da177e4SLinus Torvalds help 3501da177e4SLinus Torvalds Find out whether you have a PCI motherboard. PCI is the name of a 3511da177e4SLinus Torvalds bus system, i.e. the way the CPU talks to the other stuff inside 3521da177e4SLinus Torvalds your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or 3531da177e4SLinus Torvalds VESA. If you have PCI, say Y, otherwise N. 3541da177e4SLinus Torvalds 3551da177e4SLinus Torvalds The PCI-HOWTO, available from 3561da177e4SLinus Torvalds <http://www.tldp.org/docs.html#howto>, contains valuable 3571da177e4SLinus Torvalds information about which PCI hardware does work under Linux and which 3581da177e4SLinus Torvalds doesn't. 3591da177e4SLinus Torvalds 3601da177e4SLinus Torvalds# Select the host bridge type 3611da177e4SLinus Torvaldsconfig PCI_HOST_VIA82C505 3621da177e4SLinus Torvalds bool 3631da177e4SLinus Torvalds depends on PCI && ARCH_SHARK 3641da177e4SLinus Torvalds default y 3651da177e4SLinus Torvalds 3661da177e4SLinus Torvaldssource "drivers/pci/Kconfig" 3671da177e4SLinus Torvalds 3681da177e4SLinus Torvaldssource "drivers/pcmcia/Kconfig" 3691da177e4SLinus Torvalds 3701da177e4SLinus Torvaldsendmenu 3711da177e4SLinus Torvalds 3721da177e4SLinus Torvaldsmenu "Kernel Features" 3731da177e4SLinus Torvalds 3741da177e4SLinus Torvaldsconfig SMP 3751da177e4SLinus Torvalds bool "Symmetric Multi-Processing (EXPERIMENTAL)" 376f6db449cSRussell King depends on EXPERIMENTAL && REALVIEW_MPCORE 3771da177e4SLinus Torvalds help 3781da177e4SLinus Torvalds This enables support for systems with more than one CPU. If you have 3791da177e4SLinus Torvalds a system with only one CPU, like most personal computers, say N. If 3801da177e4SLinus Torvalds you have a system with more than one CPU, say Y. 3811da177e4SLinus Torvalds 3821da177e4SLinus Torvalds If you say N here, the kernel will run on single and multiprocessor 3831da177e4SLinus Torvalds machines, but will use only one CPU of a multiprocessor machine. If 3841da177e4SLinus Torvalds you say Y here, the kernel will run on many, but not all, single 3851da177e4SLinus Torvalds processor machines. On a single processor machine, the kernel will 3861da177e4SLinus Torvalds run faster if you say N here. 3871da177e4SLinus Torvalds 38812c62c2eSArthur Othieno See also the <file:Documentation/smp.txt>, 38912c62c2eSArthur Othieno <file:Documentation/i386/IO-APIC.txt>, 3901da177e4SLinus Torvalds <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at 3911da177e4SLinus Torvalds <http://www.linuxdoc.org/docs.html#howto>. 3921da177e4SLinus Torvalds 3931da177e4SLinus Torvalds If you don't know what to do here, say N. 3941da177e4SLinus Torvalds 3951da177e4SLinus Torvaldsconfig NR_CPUS 3961da177e4SLinus Torvalds int "Maximum number of CPUs (2-32)" 3971da177e4SLinus Torvalds range 2 32 3981da177e4SLinus Torvalds depends on SMP 3991da177e4SLinus Torvalds default "4" 4001da177e4SLinus Torvalds 401a054a811SRussell Kingconfig HOTPLUG_CPU 402a054a811SRussell King bool "Support for hot-pluggable CPUs (EXPERIMENTAL)" 403a054a811SRussell King depends on SMP && HOTPLUG && EXPERIMENTAL 404a054a811SRussell King help 405a054a811SRussell King Say Y here to experiment with turning CPUs off and on. CPUs 406a054a811SRussell King can be controlled through /sys/devices/system/cpu. 407a054a811SRussell King 40837ee16aeSRussell Kingconfig LOCAL_TIMERS 40937ee16aeSRussell King bool "Use local timer interrupts" 4102a98beb6SRussell King depends on SMP && REALVIEW_MPCORE 41137ee16aeSRussell King default y 41237ee16aeSRussell King help 41337ee16aeSRussell King Enable support for local timers on SMP platforms, rather then the 41437ee16aeSRussell King legacy IPI broadcast method. Local timers allows the system 41537ee16aeSRussell King accounting to be spread across the timer interval, preventing a 41637ee16aeSRussell King "thundering herd" at every timer tick. 41737ee16aeSRussell King 4181da177e4SLinus Torvaldsconfig PREEMPT 4191da177e4SLinus Torvalds bool "Preemptible Kernel (EXPERIMENTAL)" 4201da177e4SLinus Torvalds depends on EXPERIMENTAL 4211da177e4SLinus Torvalds help 4221da177e4SLinus Torvalds This option reduces the latency of the kernel when reacting to 4231da177e4SLinus Torvalds real-time or interactive events by allowing a low priority process to 4241da177e4SLinus Torvalds be preempted even if it is in kernel mode executing a system call. 4251da177e4SLinus Torvalds This allows applications to run more reliably even when the system is 4261da177e4SLinus Torvalds under load. 4271da177e4SLinus Torvalds 4281da177e4SLinus Torvalds Say Y here if you are building a kernel for a desktop, embedded 4291da177e4SLinus Torvalds or real-time system. Say N if you are unsure. 4301da177e4SLinus Torvalds 4318749af68SRussell Kingconfig NO_IDLE_HZ 4328749af68SRussell King bool "Dynamic tick timer" 4338749af68SRussell King help 4348749af68SRussell King Select this option if you want to disable continuous timer ticks 4358749af68SRussell King and have them programmed to occur as required. This option saves 4368749af68SRussell King power as the system can remain in idle state for longer. 4378749af68SRussell King 4388749af68SRussell King By default dynamic tick is disabled during the boot, and can be 4398749af68SRussell King manually enabled with: 4408749af68SRussell King 4418749af68SRussell King echo 1 > /sys/devices/system/timer/timer0/dyn_tick 4428749af68SRussell King 4438749af68SRussell King Alternatively, if you want dynamic tick automatically enabled 4448749af68SRussell King during boot, pass "dyntick=enable" via the kernel command string. 4458749af68SRussell King 446f2be64b3STony Lindgren Please note that dynamic tick may affect the accuracy of 447f2be64b3STony Lindgren timekeeping on some platforms depending on the implementation. 448569d2c34SNicolas Pitre Currently at least OMAP, PXA2xx and SA11x0 platforms are known 449569d2c34SNicolas Pitre to have accurate timekeeping with dynamic tick. 450f2be64b3STony Lindgren 451f8065813SRussell Kingconfig HZ 452f8065813SRussell King int 453f8065813SRussell King default 128 if ARCH_L7200 454f8065813SRussell King default 200 if ARCH_EBSA110 || ARCH_S3C2410 455bfe65704SRussell King default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER 456f8065813SRussell King default 100 457f8065813SRussell King 458704bdda0SNicolas Pitreconfig AEABI 459704bdda0SNicolas Pitre bool "Use the ARM EABI to compile the kernel" 460704bdda0SNicolas Pitre help 461704bdda0SNicolas Pitre This option allows for the kernel to be compiled using the latest 462704bdda0SNicolas Pitre ARM ABI (aka EABI). This is only useful if you are using a user 463704bdda0SNicolas Pitre space environment that is also compiled with EABI. 464704bdda0SNicolas Pitre 465704bdda0SNicolas Pitre Since there are major incompatibilities between the legacy ABI and 466704bdda0SNicolas Pitre EABI, especially with regard to structure member alignment, this 467704bdda0SNicolas Pitre option also changes the kernel syscall calling convention to 468704bdda0SNicolas Pitre disambiguate both ABIs and allow for backward compatibility support 469704bdda0SNicolas Pitre (selected with CONFIG_OABI_COMPAT). 470704bdda0SNicolas Pitre 471704bdda0SNicolas Pitre To use this you need GCC version 4.0.0 or later. 472704bdda0SNicolas Pitre 4736c90c872SNicolas Pitreconfig OABI_COMPAT 474a73a3ff1SRussell King bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)" 47561c484d4SNicolas Pitre depends on AEABI && EXPERIMENTAL 4766c90c872SNicolas Pitre default y 4776c90c872SNicolas Pitre help 4786c90c872SNicolas Pitre This option preserves the old syscall interface along with the 4796c90c872SNicolas Pitre new (ARM EABI) one. It also provides a compatibility layer to 4806c90c872SNicolas Pitre intercept syscalls that have structure arguments which layout 4816c90c872SNicolas Pitre in memory differs between the legacy ABI and the new ARM EABI 4826c90c872SNicolas Pitre (only for non "thumb" binaries). This option adds a tiny 4836c90c872SNicolas Pitre overhead to all syscalls and produces a slightly larger kernel. 4846c90c872SNicolas Pitre If you know you'll be using only pure EABI user space then you 4856c90c872SNicolas Pitre can say N here. If this option is not selected and you attempt 4866c90c872SNicolas Pitre to execute a legacy ABI binary then the result will be 4876c90c872SNicolas Pitre UNPREDICTABLE (in fact it can be predicted that it won't work 4886c90c872SNicolas Pitre at all). If in doubt say Y. 4896c90c872SNicolas Pitre 4903f22ab27SDave Hansenconfig ARCH_DISCONTIGMEM_ENABLE 4911da177e4SLinus Torvalds bool 492f7e68bbfSRussell King default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM) 4931da177e4SLinus Torvalds help 4941da177e4SLinus Torvalds Say Y to support efficient handling of discontiguous physical memory, 4951da177e4SLinus Torvalds for architectures which are either NUMA (Non-Uniform Memory Access) 4961da177e4SLinus Torvalds or have huge holes in the physical address space for other reasons. 4971da177e4SLinus Torvalds See <file:Documentation/vm/numa> for more. 4981da177e4SLinus Torvalds 4993f22ab27SDave Hansensource "mm/Kconfig" 5003f22ab27SDave Hansen 5011da177e4SLinus Torvaldsconfig LEDS 5021da177e4SLinus Torvalds bool "Timer and CPU usage LEDs" 5031da177e4SLinus Torvalds depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \ 5041da177e4SLinus Torvalds ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \ 5051da177e4SLinus Torvalds ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \ 5061da177e4SLinus Torvalds ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \ 50773a59c1cSSAN People ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \ 50873a59c1cSSAN People ARCH_AT91RM9200 5091da177e4SLinus Torvalds help 5101da177e4SLinus Torvalds If you say Y here, the LEDs on your machine will be used 5111da177e4SLinus Torvalds to provide useful information about your current system status. 5121da177e4SLinus Torvalds 5131da177e4SLinus Torvalds If you are compiling a kernel for a NetWinder or EBSA-285, you will 5141da177e4SLinus Torvalds be able to select which LEDs are active using the options below. If 5151da177e4SLinus Torvalds you are compiling a kernel for the EBSA-110 or the LART however, the 5161da177e4SLinus Torvalds red LED will simply flash regularly to indicate that the system is 5171da177e4SLinus Torvalds still functional. It is safe to say Y here if you have a CATS 5181da177e4SLinus Torvalds system, but the driver will do nothing. 5191da177e4SLinus Torvalds 5201da177e4SLinus Torvaldsconfig LEDS_TIMER 5211da177e4SLinus Torvalds bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \ 5221da177e4SLinus Torvalds MACH_OMAP_H2 || MACH_OMAP_PERSEUS2 5231da177e4SLinus Torvalds depends on LEDS 5241da177e4SLinus Torvalds default y if ARCH_EBSA110 5251da177e4SLinus Torvalds help 5261da177e4SLinus Torvalds If you say Y here, one of the system LEDs (the green one on the 5271da177e4SLinus Torvalds NetWinder, the amber one on the EBSA285, or the red one on the LART) 5281da177e4SLinus Torvalds will flash regularly to indicate that the system is still 5291da177e4SLinus Torvalds operational. This is mainly useful to kernel hackers who are 5301da177e4SLinus Torvalds debugging unstable kernels. 5311da177e4SLinus Torvalds 5321da177e4SLinus Torvalds The LART uses the same LED for both Timer LED and CPU usage LED 5331da177e4SLinus Torvalds functions. You may choose to use both, but the Timer LED function 5341da177e4SLinus Torvalds will overrule the CPU usage LED. 5351da177e4SLinus Torvalds 5361da177e4SLinus Torvaldsconfig LEDS_CPU 5371da177e4SLinus Torvalds bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \ 5381da177e4SLinus Torvalds !ARCH_OMAP) || MACH_OMAP_H2 || MACH_OMAP_PERSEUS2 5391da177e4SLinus Torvalds depends on LEDS 5401da177e4SLinus Torvalds help 5411da177e4SLinus Torvalds If you say Y here, the red LED will be used to give a good real 5421da177e4SLinus Torvalds time indication of CPU usage, by lighting whenever the idle task 5431da177e4SLinus Torvalds is not currently executing. 5441da177e4SLinus Torvalds 5451da177e4SLinus Torvalds The LART uses the same LED for both Timer LED and CPU usage LED 5461da177e4SLinus Torvalds functions. You may choose to use both, but the Timer LED function 5471da177e4SLinus Torvalds will overrule the CPU usage LED. 5481da177e4SLinus Torvalds 5491da177e4SLinus Torvaldsconfig ALIGNMENT_TRAP 5501da177e4SLinus Torvalds bool 5511da177e4SLinus Torvalds default y if !ARCH_EBSA110 5521da177e4SLinus Torvalds help 5531da177e4SLinus Torvalds ARM processors can not fetch/store information which is not 5541da177e4SLinus Torvalds naturally aligned on the bus, i.e., a 4 byte fetch must start at an 5551da177e4SLinus Torvalds address divisible by 4. On 32-bit ARM processors, these non-aligned 5561da177e4SLinus Torvalds fetch/store instructions will be emulated in software if you say 5571da177e4SLinus Torvalds here, which has a severe performance impact. This is necessary for 5581da177e4SLinus Torvalds correct operation of some network protocols. With an IP-only 5591da177e4SLinus Torvalds configuration it is safe to say N, otherwise say Y. 5601da177e4SLinus Torvalds 5611da177e4SLinus Torvaldsendmenu 5621da177e4SLinus Torvalds 5631da177e4SLinus Torvaldsmenu "Boot options" 5641da177e4SLinus Torvalds 5651da177e4SLinus Torvalds# Compressed boot loader in ROM. Yes, we really want to ask about 5661da177e4SLinus Torvalds# TEXT and BSS so we preserve their values in the config files. 5671da177e4SLinus Torvaldsconfig ZBOOT_ROM_TEXT 5681da177e4SLinus Torvalds hex "Compressed ROM boot loader base address" 5691da177e4SLinus Torvalds default "0" 5701da177e4SLinus Torvalds help 5711da177e4SLinus Torvalds The physical address at which the ROM-able zImage is to be 5721da177e4SLinus Torvalds placed in the target. Platforms which normally make use of 5731da177e4SLinus Torvalds ROM-able zImage formats normally set this to a suitable 5741da177e4SLinus Torvalds value in their defconfig file. 5751da177e4SLinus Torvalds 5761da177e4SLinus Torvalds If ZBOOT_ROM is not enabled, this has no effect. 5771da177e4SLinus Torvalds 5781da177e4SLinus Torvaldsconfig ZBOOT_ROM_BSS 5791da177e4SLinus Torvalds hex "Compressed ROM boot loader BSS address" 5801da177e4SLinus Torvalds default "0" 5811da177e4SLinus Torvalds help 5821da177e4SLinus Torvalds The base address of 64KiB of read/write memory in the target 5831da177e4SLinus Torvalds for the ROM-able zImage, which must be available while the 5841da177e4SLinus Torvalds decompressor is running. Platforms which normally make use of 5851da177e4SLinus Torvalds ROM-able zImage formats normally set this to a suitable 5861da177e4SLinus Torvalds value in their defconfig file. 5871da177e4SLinus Torvalds 5881da177e4SLinus Torvalds If ZBOOT_ROM is not enabled, this has no effect. 5891da177e4SLinus Torvalds 5901da177e4SLinus Torvaldsconfig ZBOOT_ROM 5911da177e4SLinus Torvalds bool "Compressed boot loader in ROM/flash" 5921da177e4SLinus Torvalds depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS 5931da177e4SLinus Torvalds help 5941da177e4SLinus Torvalds Say Y here if you intend to execute your compressed kernel image 5951da177e4SLinus Torvalds (zImage) directly from ROM or flash. If unsure, say N. 5961da177e4SLinus Torvalds 5971da177e4SLinus Torvaldsconfig CMDLINE 5981da177e4SLinus Torvalds string "Default kernel command string" 5991da177e4SLinus Torvalds default "" 6001da177e4SLinus Torvalds help 6011da177e4SLinus Torvalds On some architectures (EBSA110 and CATS), there is currently no way 6021da177e4SLinus Torvalds for the boot loader to pass arguments to the kernel. For these 6031da177e4SLinus Torvalds architectures, you should supply some command-line options at build 6041da177e4SLinus Torvalds time by entering them here. As a minimum, you should specify the 6051da177e4SLinus Torvalds memory size and the root device (e.g., mem=64M root=/dev/nfs). 6061da177e4SLinus Torvalds 6071da177e4SLinus Torvaldsconfig XIP_KERNEL 6081da177e4SLinus Torvalds bool "Kernel Execute-In-Place from ROM" 6091da177e4SLinus Torvalds depends on !ZBOOT_ROM 6101da177e4SLinus Torvalds help 6111da177e4SLinus Torvalds Execute-In-Place allows the kernel to run from non-volatile storage 6121da177e4SLinus Torvalds directly addressable by the CPU, such as NOR flash. This saves RAM 6131da177e4SLinus Torvalds space since the text section of the kernel is not loaded from flash 6141da177e4SLinus Torvalds to RAM. Read-write sections, such as the data section and stack, 6151da177e4SLinus Torvalds are still copied to RAM. The XIP kernel is not compressed since 6161da177e4SLinus Torvalds it has to run directly from flash, so it will take more space to 6171da177e4SLinus Torvalds store it. The flash address used to link the kernel object files, 6181da177e4SLinus Torvalds and for storing it, is configuration dependent. Therefore, if you 6191da177e4SLinus Torvalds say Y here, you must know the proper physical address where to 6201da177e4SLinus Torvalds store the kernel image depending on your own flash memory usage. 6211da177e4SLinus Torvalds 6221da177e4SLinus Torvalds Also note that the make target becomes "make xipImage" rather than 6231da177e4SLinus Torvalds "make zImage" or "make Image". The final kernel binary to put in 6241da177e4SLinus Torvalds ROM memory will be arch/arm/boot/xipImage. 6251da177e4SLinus Torvalds 6261da177e4SLinus Torvalds If unsure, say N. 6271da177e4SLinus Torvalds 6281da177e4SLinus Torvaldsconfig XIP_PHYS_ADDR 6291da177e4SLinus Torvalds hex "XIP Kernel Physical Location" 6301da177e4SLinus Torvalds depends on XIP_KERNEL 6311da177e4SLinus Torvalds default "0x00080000" 6321da177e4SLinus Torvalds help 6331da177e4SLinus Torvalds This is the physical address in your flash memory the kernel will 6341da177e4SLinus Torvalds be linked for and stored to. This address is dependent on your 6351da177e4SLinus Torvalds own flash usage. 6361da177e4SLinus Torvalds 6371da177e4SLinus Torvaldsendmenu 6381da177e4SLinus Torvalds 639ec6bced6STony Lindgrenif (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP1) 6401da177e4SLinus Torvalds 6411da177e4SLinus Torvaldsmenu "CPU Frequency scaling" 6421da177e4SLinus Torvalds 6431da177e4SLinus Torvaldssource "drivers/cpufreq/Kconfig" 6441da177e4SLinus Torvalds 6451da177e4SLinus Torvaldsconfig CPU_FREQ_SA1100 6461da177e4SLinus Torvalds bool 64707c6d48fSVincent Sanders depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT) 6481da177e4SLinus Torvalds default y 6491da177e4SLinus Torvalds 6501da177e4SLinus Torvaldsconfig CPU_FREQ_SA1110 6511da177e4SLinus Torvalds bool 6521da177e4SLinus Torvalds depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3) 6531da177e4SLinus Torvalds default y 6541da177e4SLinus Torvalds 6551da177e4SLinus Torvaldsconfig CPU_FREQ_INTEGRATOR 6561da177e4SLinus Torvalds tristate "CPUfreq driver for ARM Integrator CPUs" 6571da177e4SLinus Torvalds depends on ARCH_INTEGRATOR && CPU_FREQ 6581da177e4SLinus Torvalds default y 6591da177e4SLinus Torvalds help 6601da177e4SLinus Torvalds This enables the CPUfreq driver for ARM Integrator CPUs. 6611da177e4SLinus Torvalds 6621da177e4SLinus Torvalds For details, take a look at <file:Documentation/cpu-freq>. 6631da177e4SLinus Torvalds 6641da177e4SLinus Torvalds If in doubt, say Y. 6651da177e4SLinus Torvalds 6661da177e4SLinus Torvaldsendmenu 6671da177e4SLinus Torvalds 6681da177e4SLinus Torvaldsendif 6691da177e4SLinus Torvalds 6701da177e4SLinus Torvaldsmenu "Floating point emulation" 6711da177e4SLinus Torvalds 6721da177e4SLinus Torvaldscomment "At least one emulation must be selected" 6731da177e4SLinus Torvalds 6741da177e4SLinus Torvaldsconfig FPE_NWFPE 6751da177e4SLinus Torvalds bool "NWFPE math emulation" 6768993a44cSNicolas Pitre depends on !AEABI || OABI_COMPAT 6771da177e4SLinus Torvalds ---help--- 6781da177e4SLinus Torvalds Say Y to include the NWFPE floating point emulator in the kernel. 6791da177e4SLinus Torvalds This is necessary to run most binaries. Linux does not currently 6801da177e4SLinus Torvalds support floating point hardware so you need to say Y here even if 6811da177e4SLinus Torvalds your machine has an FPA or floating point co-processor podule. 6821da177e4SLinus Torvalds 6831da177e4SLinus Torvalds You may say N here if you are going to load the Acorn FPEmulator 6841da177e4SLinus Torvalds early in the bootup. 6851da177e4SLinus Torvalds 6861da177e4SLinus Torvaldsconfig FPE_NWFPE_XP 6871da177e4SLinus Torvalds bool "Support extended precision" 688bedf142bSLennert Buytenhek depends on FPE_NWFPE 6891da177e4SLinus Torvalds help 6901da177e4SLinus Torvalds Say Y to include 80-bit support in the kernel floating-point 6911da177e4SLinus Torvalds emulator. Otherwise, only 32 and 64-bit support is compiled in. 6921da177e4SLinus Torvalds Note that gcc does not generate 80-bit operations by default, 6931da177e4SLinus Torvalds so in most cases this option only enlarges the size of the 6941da177e4SLinus Torvalds floating point emulator without any good reason. 6951da177e4SLinus Torvalds 6961da177e4SLinus Torvalds You almost surely want to say N here. 6971da177e4SLinus Torvalds 6981da177e4SLinus Torvaldsconfig FPE_FASTFPE 6991da177e4SLinus Torvalds bool "FastFPE math emulation (EXPERIMENTAL)" 7008993a44cSNicolas Pitre depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL 7011da177e4SLinus Torvalds ---help--- 7021da177e4SLinus Torvalds Say Y here to include the FAST floating point emulator in the kernel. 7031da177e4SLinus Torvalds This is an experimental much faster emulator which now also has full 7041da177e4SLinus Torvalds precision for the mantissa. It does not support any exceptions. 7051da177e4SLinus Torvalds It is very simple, and approximately 3-6 times faster than NWFPE. 7061da177e4SLinus Torvalds 7071da177e4SLinus Torvalds It should be sufficient for most programs. It may be not suitable 7081da177e4SLinus Torvalds for scientific calculations, but you have to check this for yourself. 7091da177e4SLinus Torvalds If you do not feel you need a faster FP emulation you should better 7101da177e4SLinus Torvalds choose NWFPE. 7111da177e4SLinus Torvalds 7121da177e4SLinus Torvaldsconfig VFP 7131da177e4SLinus Torvalds bool "VFP-format floating point maths" 7141da177e4SLinus Torvalds depends on CPU_V6 || CPU_ARM926T 7151da177e4SLinus Torvalds help 7161da177e4SLinus Torvalds Say Y to include VFP support code in the kernel. This is needed 7171da177e4SLinus Torvalds if your hardware includes a VFP unit. 7181da177e4SLinus Torvalds 7191da177e4SLinus Torvalds Please see <file:Documentation/arm/VFP/release-notes.txt> for 7201da177e4SLinus Torvalds release notes and additional status information. 7211da177e4SLinus Torvalds 7221da177e4SLinus Torvalds Say N if your target does not have VFP hardware. 7231da177e4SLinus Torvalds 7241da177e4SLinus Torvaldsendmenu 7251da177e4SLinus Torvalds 7261da177e4SLinus Torvaldsmenu "Userspace binary formats" 7271da177e4SLinus Torvalds 7281da177e4SLinus Torvaldssource "fs/Kconfig.binfmt" 7291da177e4SLinus Torvalds 7301da177e4SLinus Torvaldsconfig ARTHUR 7311da177e4SLinus Torvalds tristate "RISC OS personality" 732704bdda0SNicolas Pitre depends on !AEABI 7331da177e4SLinus Torvalds help 7341da177e4SLinus Torvalds Say Y here to include the kernel code necessary if you want to run 7351da177e4SLinus Torvalds Acorn RISC OS/Arthur binaries under Linux. This code is still very 7361da177e4SLinus Torvalds experimental; if this sounds frightening, say N and sleep in peace. 7371da177e4SLinus Torvalds You can also say M here to compile this support as a module (which 7381da177e4SLinus Torvalds will be called arthur). 7391da177e4SLinus Torvalds 7401da177e4SLinus Torvaldsendmenu 7411da177e4SLinus Torvalds 7421da177e4SLinus Torvaldsmenu "Power management options" 7431da177e4SLinus Torvalds 744eceab4acSRussell Kingsource "kernel/power/Kconfig" 7451da177e4SLinus Torvalds 7461da177e4SLinus Torvaldsconfig APM 7471da177e4SLinus Torvalds tristate "Advanced Power Management Emulation" 7481da177e4SLinus Torvalds ---help--- 7491da177e4SLinus Torvalds APM is a BIOS specification for saving power using several different 7501da177e4SLinus Torvalds techniques. This is mostly useful for battery powered laptops with 7511da177e4SLinus Torvalds APM compliant BIOSes. If you say Y here, the system time will be 7521da177e4SLinus Torvalds reset after a RESUME operation, the /proc/apm device will provide 7531da177e4SLinus Torvalds battery status information, and user-space programs will receive 7541da177e4SLinus Torvalds notification of APM "events" (e.g. battery status change). 7551da177e4SLinus Torvalds 7561da177e4SLinus Torvalds In order to use APM, you will need supporting software. For location 7571da177e4SLinus Torvalds and more information, read <file:Documentation/pm.txt> and the 7581da177e4SLinus Torvalds Battery Powered Linux mini-HOWTO, available from 7591da177e4SLinus Torvalds <http://www.tldp.org/docs.html#howto>. 7601da177e4SLinus Torvalds 7611da177e4SLinus Torvalds This driver does not spin down disk drives (see the hdparm(8) 7621da177e4SLinus Torvalds manpage ("man 8 hdparm") for that), and it doesn't turn off 7631da177e4SLinus Torvalds VESA-compliant "green" monitors. 7641da177e4SLinus Torvalds 7651da177e4SLinus Torvalds Generally, if you don't have a battery in your machine, there isn't 7661da177e4SLinus Torvalds much point in using this driver and you should say N. If you get 7671da177e4SLinus Torvalds random kernel OOPSes or reboots that don't seem to be related to 7681da177e4SLinus Torvalds anything, try disabling/enabling this option (or disabling/enabling 7691da177e4SLinus Torvalds APM in your BIOS). 7701da177e4SLinus Torvalds 7711da177e4SLinus Torvaldsendmenu 7721da177e4SLinus Torvalds 773d5950b43SSam Ravnborgsource "net/Kconfig" 774d5950b43SSam Ravnborg 7751da177e4SLinus Torvaldsmenu "Device Drivers" 7761da177e4SLinus Torvalds 7771da177e4SLinus Torvaldssource "drivers/base/Kconfig" 7781da177e4SLinus Torvalds 779c35bf4a5SPavel Macheksource "drivers/connector/Kconfig" 780c35bf4a5SPavel Machek 7811da177e4SLinus Torvaldsif ALIGNMENT_TRAP 7821da177e4SLinus Torvaldssource "drivers/mtd/Kconfig" 7831da177e4SLinus Torvaldsendif 7841da177e4SLinus Torvalds 7851da177e4SLinus Torvaldssource "drivers/parport/Kconfig" 7861da177e4SLinus Torvalds 7871da177e4SLinus Torvaldssource "drivers/pnp/Kconfig" 7881da177e4SLinus Torvalds 7891da177e4SLinus Torvaldssource "drivers/block/Kconfig" 7901da177e4SLinus Torvalds 7911da177e4SLinus Torvaldssource "drivers/acorn/block/Kconfig" 7921da177e4SLinus Torvalds 793bb011b8eSDavid Brownellif PCMCIA || ARCH_CLPS7500 || ARCH_IOP3XX || ARCH_IXP4XX \ 794bb011b8eSDavid Brownell || ARCH_L7200 || ARCH_LH7A40X || ARCH_PXA || ARCH_RPC \ 795d56c524aSRussell King || ARCH_S3C2410 || ARCH_SA1100 || ARCH_SHARK || FOOTBRIDGE 7961da177e4SLinus Torvaldssource "drivers/ide/Kconfig" 7971da177e4SLinus Torvaldsendif 7981da177e4SLinus Torvalds 7991da177e4SLinus Torvaldssource "drivers/scsi/Kconfig" 8001da177e4SLinus Torvalds 8011da177e4SLinus Torvaldssource "drivers/md/Kconfig" 8021da177e4SLinus Torvalds 8031da177e4SLinus Torvaldssource "drivers/message/fusion/Kconfig" 8041da177e4SLinus Torvalds 8051da177e4SLinus Torvaldssource "drivers/ieee1394/Kconfig" 8061da177e4SLinus Torvalds 8071da177e4SLinus Torvaldssource "drivers/message/i2o/Kconfig" 8081da177e4SLinus Torvalds 809d5950b43SSam Ravnborgsource "drivers/net/Kconfig" 8101da177e4SLinus Torvalds 8111da177e4SLinus Torvaldssource "drivers/isdn/Kconfig" 8121da177e4SLinus Torvalds 8131da177e4SLinus Torvalds# input before char - char/joystick depends on it. As does USB. 8141da177e4SLinus Torvalds 8151da177e4SLinus Torvaldssource "drivers/input/Kconfig" 8161da177e4SLinus Torvalds 8171da177e4SLinus Torvaldssource "drivers/char/Kconfig" 8181da177e4SLinus Torvalds 8191da177e4SLinus Torvaldssource "drivers/i2c/Kconfig" 8201da177e4SLinus Torvalds 8218ae12a0dSDavid Brownellsource "drivers/spi/Kconfig" 8228ae12a0dSDavid Brownell 82304916c0eSAlessandro Zummosource "drivers/w1/Kconfig" 82404916c0eSAlessandro Zummo 825ad2f931dSJean Delvaresource "drivers/hwmon/Kconfig" 826ad2f931dSJean Delvare 8271da177e4SLinus Torvalds#source "drivers/l3/Kconfig" 8281da177e4SLinus Torvalds 8291da177e4SLinus Torvaldssource "drivers/misc/Kconfig" 8301da177e4SLinus Torvalds 831a4e137abSRussell Kingsource "drivers/mfd/Kconfig" 832a4e137abSRussell King 8331da177e4SLinus Torvaldssource "drivers/media/Kconfig" 8341da177e4SLinus Torvalds 8351da177e4SLinus Torvaldssource "drivers/video/Kconfig" 8361da177e4SLinus Torvalds 8371da177e4SLinus Torvaldssource "sound/Kconfig" 8381da177e4SLinus Torvalds 8391da177e4SLinus Torvaldssource "drivers/usb/Kconfig" 8401da177e4SLinus Torvalds 8411da177e4SLinus Torvaldssource "drivers/mmc/Kconfig" 8421da177e4SLinus Torvalds 843*12b824fbSAlessandro Zummosource "drivers/rtc/Kconfig" 844*12b824fbSAlessandro Zummo 8451da177e4SLinus Torvaldsendmenu 8461da177e4SLinus Torvalds 8471da177e4SLinus Torvaldssource "fs/Kconfig" 8481da177e4SLinus Torvalds 8491da177e4SLinus Torvaldssource "arch/arm/oprofile/Kconfig" 8501da177e4SLinus Torvalds 8511da177e4SLinus Torvaldssource "arch/arm/Kconfig.debug" 8521da177e4SLinus Torvalds 8531da177e4SLinus Torvaldssource "security/Kconfig" 8541da177e4SLinus Torvalds 8551da177e4SLinus Torvaldssource "crypto/Kconfig" 8561da177e4SLinus Torvalds 8571da177e4SLinus Torvaldssource "lib/Kconfig" 858