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 111da177e4SLinus Torvalds help 121da177e4SLinus Torvalds The ARM series is a line of low-power-consumption RISC chip designs 13f6c8965aSMartin Michlmayr licensed by ARM Ltd and targeted at embedded applications and 141da177e4SLinus Torvalds handhelds such as the Compaq IPAQ. ARM-based PCs are no longer 151da177e4SLinus Torvalds manufactured, but legacy ARM-based PC hardware remains popular in 161da177e4SLinus Torvalds Europe. There is an ARM Linux project with a web page at 171da177e4SLinus Torvalds <http://www.arm.linux.org.uk/>. 181da177e4SLinus Torvalds 191da177e4SLinus Torvaldsconfig MMU 201da177e4SLinus Torvalds bool 211da177e4SLinus Torvalds default y 221da177e4SLinus Torvalds 231da177e4SLinus Torvaldsconfig EISA 241da177e4SLinus Torvalds bool 251da177e4SLinus Torvalds ---help--- 261da177e4SLinus Torvalds The Extended Industry Standard Architecture (EISA) bus was 271da177e4SLinus Torvalds developed as an open alternative to the IBM MicroChannel bus. 281da177e4SLinus Torvalds 291da177e4SLinus Torvalds The EISA bus provided some of the features of the IBM MicroChannel 301da177e4SLinus Torvalds bus while maintaining backward compatibility with cards made for 311da177e4SLinus Torvalds the older ISA bus. The EISA bus saw limited use between 1988 and 321da177e4SLinus Torvalds 1995 when it was made obsolete by the PCI bus. 331da177e4SLinus Torvalds 341da177e4SLinus Torvalds Say Y here if you are building a kernel for an EISA-based machine. 351da177e4SLinus Torvalds 361da177e4SLinus Torvalds Otherwise, say N. 371da177e4SLinus Torvalds 381da177e4SLinus Torvaldsconfig SBUS 391da177e4SLinus Torvalds bool 401da177e4SLinus Torvalds 411da177e4SLinus Torvaldsconfig MCA 421da177e4SLinus Torvalds bool 431da177e4SLinus Torvalds help 441da177e4SLinus Torvalds MicroChannel Architecture is found in some IBM PS/2 machines and 451da177e4SLinus Torvalds laptops. It is a bus system similar to PCI or ISA. See 461da177e4SLinus Torvalds <file:Documentation/mca.txt> (and especially the web page given 471da177e4SLinus Torvalds there) before attempting to build an MCA bus kernel. 481da177e4SLinus Torvalds 491da177e4SLinus Torvaldsconfig RWSEM_GENERIC_SPINLOCK 501da177e4SLinus Torvalds bool 511da177e4SLinus Torvalds default y 521da177e4SLinus Torvalds 531da177e4SLinus Torvaldsconfig RWSEM_XCHGADD_ALGORITHM 541da177e4SLinus Torvalds bool 551da177e4SLinus Torvalds 56*b89c3b16SAkinobu Mitaconfig GENERIC_HWEIGHT 57*b89c3b16SAkinobu Mita bool 58*b89c3b16SAkinobu Mita default y 59*b89c3b16SAkinobu Mita 601da177e4SLinus Torvaldsconfig GENERIC_CALIBRATE_DELAY 611da177e4SLinus Torvalds bool 621da177e4SLinus Torvalds default y 631da177e4SLinus Torvalds 641da177e4SLinus Torvaldsconfig GENERIC_BUST_SPINLOCK 651da177e4SLinus Torvalds bool 661da177e4SLinus Torvalds 67a08b6b79Sviro@ZenIV.linux.org.ukconfig ARCH_MAY_HAVE_PC_FDC 68a08b6b79Sviro@ZenIV.linux.org.uk bool 69a08b6b79Sviro@ZenIV.linux.org.uk 701da177e4SLinus Torvaldsconfig GENERIC_ISA_DMA 711da177e4SLinus Torvalds bool 721da177e4SLinus Torvalds 731da177e4SLinus Torvaldsconfig FIQ 741da177e4SLinus Torvalds bool 751da177e4SLinus Torvalds 76034d2f5aSAl Viroconfig ARCH_MTD_XIP 77034d2f5aSAl Viro bool 78034d2f5aSAl Viro 791da177e4SLinus Torvaldssource "init/Kconfig" 801da177e4SLinus Torvalds 811da177e4SLinus Torvaldsmenu "System Type" 821da177e4SLinus Torvalds 831da177e4SLinus Torvaldschoice 841da177e4SLinus Torvalds prompt "ARM system type" 856a0e2430SCatalin Marinas default ARCH_VERSATILE 861da177e4SLinus Torvalds 871da177e4SLinus Torvaldsconfig ARCH_CLPS7500 881da177e4SLinus Torvalds bool "Cirrus-CL-PS7500FE" 891da177e4SLinus Torvalds select TIMER_ACORN 90f7e68bbfSRussell King select ISA 91f999b8bdSMartin Michlmayr help 92f999b8bdSMartin Michlmayr Support for the Cirrus Logic PS7500FE system-on-a-chip. 931da177e4SLinus Torvalds 941da177e4SLinus Torvaldsconfig ARCH_CLPS711X 951da177e4SLinus Torvalds bool "CLPS711x/EP721x-based" 96f999b8bdSMartin Michlmayr help 97f999b8bdSMartin Michlmayr Support for Cirrus Logic 711x/721x based boards. 981da177e4SLinus Torvalds 991da177e4SLinus Torvaldsconfig ARCH_CO285 1001da177e4SLinus Torvalds bool "Co-EBSA285" 1011da177e4SLinus Torvalds select FOOTBRIDGE 1021da177e4SLinus Torvalds select FOOTBRIDGE_ADDIN 103f999b8bdSMartin Michlmayr help 104f999b8bdSMartin Michlmayr Support for Intel's EBSA285 companion chip. 1051da177e4SLinus Torvalds 1061da177e4SLinus Torvaldsconfig ARCH_EBSA110 1071da177e4SLinus Torvalds bool "EBSA-110" 108f7e68bbfSRussell King select ISA 1091da177e4SLinus Torvalds help 1101da177e4SLinus Torvalds This is an evaluation board for the StrongARM processor available 111f6c8965aSMartin Michlmayr from Digital. It has limited hardware on-board, including an 1121da177e4SLinus Torvalds Ethernet interface, two PCMCIA sockets, two serial ports and a 1131da177e4SLinus Torvalds parallel port. 1141da177e4SLinus Torvalds 115e7736d47SLennert Buytenhekconfig ARCH_EP93XX 116e7736d47SLennert Buytenhek bool "EP93xx-based" 117e7736d47SLennert Buytenhek select ARM_AMBA 118e7736d47SLennert Buytenhek select ARM_VIC 119e7736d47SLennert Buytenhek help 120e7736d47SLennert Buytenhek This enables support for the Cirrus EP93xx series of CPUs. 121e7736d47SLennert Buytenhek 1221da177e4SLinus Torvaldsconfig ARCH_FOOTBRIDGE 1231da177e4SLinus Torvalds bool "FootBridge" 1241da177e4SLinus Torvalds select FOOTBRIDGE 125f999b8bdSMartin Michlmayr help 126f999b8bdSMartin Michlmayr Support for systems based on the DC21285 companion chip 127f999b8bdSMartin Michlmayr ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder. 1281da177e4SLinus Torvalds 1291da177e4SLinus Torvaldsconfig ARCH_INTEGRATOR 1301da177e4SLinus Torvalds bool "Integrator" 1311da177e4SLinus Torvalds select ARM_AMBA 1321da177e4SLinus Torvalds select ICST525 133f999b8bdSMartin Michlmayr help 134f999b8bdSMartin Michlmayr Support for ARM's Integrator platform. 1351da177e4SLinus Torvalds 1361da177e4SLinus Torvaldsconfig ARCH_IOP3XX 1371da177e4SLinus Torvalds bool "IOP3xx-based" 138f7e68bbfSRussell King select PCI 139f999b8bdSMartin Michlmayr help 140f999b8bdSMartin Michlmayr Support for Intel's IOP3XX (XScale) family of processors. 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvaldsconfig ARCH_IXP4XX 1431da177e4SLinus Torvalds bool "IXP4xx-based" 1441da177e4SLinus Torvalds select DMABOUNCE 145f7e68bbfSRussell King select PCI 146f999b8bdSMartin Michlmayr help 147f999b8bdSMartin Michlmayr Support for Intel's IXP4XX (XScale) family of processors. 1481da177e4SLinus Torvalds 1491da177e4SLinus Torvaldsconfig ARCH_IXP2000 1501da177e4SLinus Torvalds bool "IXP2400/2800-based" 151f7e68bbfSRussell King select PCI 152f999b8bdSMartin Michlmayr help 153f999b8bdSMartin Michlmayr Support for Intel's IXP2400/2800 (XScale) family of processors. 1541da177e4SLinus Torvalds 1551da177e4SLinus Torvaldsconfig ARCH_L7200 1561da177e4SLinus Torvalds bool "LinkUp-L7200" 1571da177e4SLinus Torvalds select FIQ 1581da177e4SLinus Torvalds help 1591da177e4SLinus Torvalds Say Y here if you intend to run this kernel on a LinkUp Systems 1601da177e4SLinus Torvalds L7200 Software Development Board which uses an ARM720T processor. 1611da177e4SLinus Torvalds Information on this board can be obtained at: 1621da177e4SLinus Torvalds 1631da177e4SLinus Torvalds <http://www.linkupsys.com/> 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds If you have any questions or comments about the Linux kernel port 1661da177e4SLinus Torvalds to this board, send e-mail to <sjhill@cotw.com>. 1671da177e4SLinus Torvalds 1681da177e4SLinus Torvaldsconfig ARCH_PXA 1691da177e4SLinus Torvalds bool "PXA2xx-based" 170034d2f5aSAl Viro select ARCH_MTD_XIP 171f999b8bdSMartin Michlmayr help 172f999b8bdSMartin Michlmayr Support for Intel's PXA2XX processor line. 1731da177e4SLinus Torvalds 1741da177e4SLinus Torvaldsconfig ARCH_RPC 1751da177e4SLinus Torvalds bool "RiscPC" 1761da177e4SLinus Torvalds select ARCH_ACORN 1771da177e4SLinus Torvalds select FIQ 1781da177e4SLinus Torvalds select TIMER_ACORN 179a08b6b79Sviro@ZenIV.linux.org.uk select ARCH_MAY_HAVE_PC_FDC 180065909b9SRussell King select ISA_DMA_API 1811da177e4SLinus Torvalds help 1821da177e4SLinus Torvalds On the Acorn Risc-PC, Linux can support the internal IDE disk and 1831da177e4SLinus Torvalds CD-ROM interface, serial and parallel port, and the floppy drive. 1841da177e4SLinus Torvalds 1851da177e4SLinus Torvaldsconfig ARCH_SA1100 1861da177e4SLinus Torvalds bool "SA1100-based" 187f7e68bbfSRussell King select ISA 1883cd9e19eSRussell King select ARCH_DISCONTIGMEM_ENABLE 189034d2f5aSAl Viro select ARCH_MTD_XIP 190f999b8bdSMartin Michlmayr help 191f999b8bdSMartin Michlmayr Support for StrongARM 11x0 based boards. 1921da177e4SLinus Torvalds 1931da177e4SLinus Torvaldsconfig ARCH_S3C2410 1941da177e4SLinus Torvalds bool "Samsung S3C2410" 1951da177e4SLinus Torvalds help 1961da177e4SLinus Torvalds Samsung S3C2410X CPU based systems, such as the Simtec Electronics 1971da177e4SLinus Torvalds BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or 198f6c8965aSMartin Michlmayr the Samsung SMDK2410 development board (and derivatives). 1991da177e4SLinus Torvalds 2001da177e4SLinus Torvaldsconfig ARCH_SHARK 2011da177e4SLinus Torvalds bool "Shark" 202f7e68bbfSRussell King select ISA 203f7e68bbfSRussell King select ISA_DMA 204f7e68bbfSRussell King select PCI 205f999b8bdSMartin Michlmayr help 206f999b8bdSMartin Michlmayr Support for the StrongARM based Digital DNARD machine, also known 207f999b8bdSMartin Michlmayr as "Shark" (<http://www.shark-linux.de/shark.html>). 2081da177e4SLinus Torvalds 2091da177e4SLinus Torvaldsconfig ARCH_LH7A40X 2101da177e4SLinus Torvalds bool "Sharp LH7A40X" 2111da177e4SLinus Torvalds help 2121da177e4SLinus Torvalds Say Y here for systems based on one of the Sharp LH7A40X 2131da177e4SLinus Torvalds System on a Chip processors. These CPUs include an ARM922T 2141da177e4SLinus Torvalds core with a wide array of integrated devices for 2151da177e4SLinus Torvalds hand-held and low-power applications. 2161da177e4SLinus Torvalds 2171da177e4SLinus Torvaldsconfig ARCH_OMAP 2181da177e4SLinus Torvalds bool "TI OMAP" 219f999b8bdSMartin Michlmayr help 220f999b8bdSMartin Michlmayr Support for TI's OMAP platform (OMAP1 and OMAP2). 2211da177e4SLinus Torvalds 2221da177e4SLinus Torvaldsconfig ARCH_VERSATILE 2231da177e4SLinus Torvalds bool "Versatile" 2241da177e4SLinus Torvalds select ARM_AMBA 225fa0fe48fSRussell King select ARM_VIC 2261da177e4SLinus Torvalds select ICST307 2271da177e4SLinus Torvalds help 2281da177e4SLinus Torvalds This enables support for ARM Ltd Versatile board. 2291da177e4SLinus Torvalds 2308ad68bbfSCatalin Marinasconfig ARCH_REALVIEW 2318ad68bbfSCatalin Marinas bool "RealView" 2328ad68bbfSCatalin Marinas select ARM_AMBA 2338ad68bbfSCatalin Marinas select ICST307 2348ad68bbfSCatalin Marinas help 2358ad68bbfSCatalin Marinas This enables support for ARM Ltd RealView boards. 2368ad68bbfSCatalin Marinas 2371da177e4SLinus Torvaldsconfig ARCH_IMX 2381da177e4SLinus Torvalds bool "IMX" 239f999b8bdSMartin Michlmayr help 240f999b8bdSMartin Michlmayr Support for Motorola's i.MX family of processors (MX1, MXL). 2411da177e4SLinus Torvalds 2421da177e4SLinus Torvaldsconfig ARCH_H720X 2431da177e4SLinus Torvalds bool "Hynix-HMS720x-based" 244065909b9SRussell King select ISA_DMA_API 2451da177e4SLinus Torvalds help 2461da177e4SLinus Torvalds This enables support for systems based on the Hynix HMS720x 2471da177e4SLinus Torvalds 248038c5b60SBellido Nicolasconfig ARCH_AAEC2000 249038c5b60SBellido Nicolas bool "Agilent AAEC-2000 based" 250049eb329SBellido Nicolas select ARM_AMBA 251038c5b60SBellido Nicolas help 252038c5b60SBellido Nicolas This enables support for systems based on the Agilent AAEC-2000 253038c5b60SBellido Nicolas 25473a59c1cSSAN Peopleconfig ARCH_AT91RM9200 25573a59c1cSSAN People bool "AT91RM9200" 25673a59c1cSSAN People help 257f999b8bdSMartin Michlmayr Say Y here if you intend to run this kernel on an Atmel 258f999b8bdSMartin Michlmayr AT91RM9200-based board. 25973a59c1cSSAN People 2601da177e4SLinus Torvaldsendchoice 2611da177e4SLinus Torvalds 2621da177e4SLinus Torvaldssource "arch/arm/mach-clps711x/Kconfig" 2631da177e4SLinus Torvalds 264e7736d47SLennert Buytenheksource "arch/arm/mach-ep93xx/Kconfig" 265e7736d47SLennert Buytenhek 2661da177e4SLinus Torvaldssource "arch/arm/mach-footbridge/Kconfig" 2671da177e4SLinus Torvalds 2681da177e4SLinus Torvaldssource "arch/arm/mach-integrator/Kconfig" 2691da177e4SLinus Torvalds 2701da177e4SLinus Torvaldssource "arch/arm/mach-iop3xx/Kconfig" 2711da177e4SLinus Torvalds 2721da177e4SLinus Torvaldssource "arch/arm/mach-ixp4xx/Kconfig" 2731da177e4SLinus Torvalds 2741da177e4SLinus Torvaldssource "arch/arm/mach-ixp2000/Kconfig" 2751da177e4SLinus Torvalds 2761da177e4SLinus Torvaldssource "arch/arm/mach-pxa/Kconfig" 2771da177e4SLinus Torvalds 2781da177e4SLinus Torvaldssource "arch/arm/mach-sa1100/Kconfig" 2791da177e4SLinus Torvalds 280d48af15eSTony Lindgrensource "arch/arm/plat-omap/Kconfig" 281d48af15eSTony Lindgren 282d48af15eSTony Lindgrensource "arch/arm/mach-omap1/Kconfig" 2831da177e4SLinus Torvalds 2841dbae815STony Lindgrensource "arch/arm/mach-omap2/Kconfig" 2851dbae815STony Lindgren 2861da177e4SLinus Torvaldssource "arch/arm/mach-s3c2410/Kconfig" 2871da177e4SLinus Torvalds 2881da177e4SLinus Torvaldssource "arch/arm/mach-lh7a40x/Kconfig" 2891da177e4SLinus Torvalds 2901da177e4SLinus Torvaldssource "arch/arm/mach-imx/Kconfig" 2911da177e4SLinus Torvalds 2921da177e4SLinus Torvaldssource "arch/arm/mach-h720x/Kconfig" 2931da177e4SLinus Torvalds 2941da177e4SLinus Torvaldssource "arch/arm/mach-versatile/Kconfig" 2951da177e4SLinus Torvalds 296038c5b60SBellido Nicolassource "arch/arm/mach-aaec2000/Kconfig" 297038c5b60SBellido Nicolas 2988ad68bbfSCatalin Marinassource "arch/arm/mach-realview/Kconfig" 2998ad68bbfSCatalin Marinas 30073a59c1cSSAN Peoplesource "arch/arm/mach-at91rm9200/Kconfig" 30173a59c1cSSAN People 3021da177e4SLinus Torvalds# Definitions to make life easier 3031da177e4SLinus Torvaldsconfig ARCH_ACORN 3041da177e4SLinus Torvalds bool 3051da177e4SLinus Torvalds 3061da177e4SLinus Torvaldssource arch/arm/mm/Kconfig 3071da177e4SLinus Torvalds 3081da177e4SLinus Torvalds# bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER 3091da177e4SLinus Torvaldsconfig XSCALE_PMU 3101da177e4SLinus Torvalds bool 3111da177e4SLinus Torvalds depends on CPU_XSCALE && !XSCALE_PMU_TIMER 3121da177e4SLinus Torvalds default y 3131da177e4SLinus Torvalds 3141da177e4SLinus Torvaldsendmenu 3151da177e4SLinus Torvalds 3161da177e4SLinus Torvaldssource "arch/arm/common/Kconfig" 3171da177e4SLinus Torvalds 3181da177e4SLinus Torvaldsconfig FORCE_MAX_ZONEORDER 3191da177e4SLinus Torvalds int 3201da177e4SLinus Torvalds depends on SA1111 3211da177e4SLinus Torvalds default "9" 3221da177e4SLinus Torvalds 3231da177e4SLinus Torvaldsmenu "Bus support" 3241da177e4SLinus Torvalds 3251da177e4SLinus Torvaldsconfig ARM_AMBA 3261da177e4SLinus Torvalds bool 3271da177e4SLinus Torvalds 3281da177e4SLinus Torvaldsconfig ISA 3291da177e4SLinus Torvalds bool 3301da177e4SLinus Torvalds help 3311da177e4SLinus Torvalds Find out whether you have ISA slots on your motherboard. ISA is the 3321da177e4SLinus Torvalds name of a bus system, i.e. the way the CPU talks to the other stuff 3331da177e4SLinus Torvalds inside your box. Other bus systems are PCI, EISA, MicroChannel 3341da177e4SLinus Torvalds (MCA) or VESA. ISA is an older system, now being displaced by PCI; 3351da177e4SLinus Torvalds newer boards don't support it. If you have ISA, say Y, otherwise N. 3361da177e4SLinus Torvalds 337065909b9SRussell King# Select ISA DMA controller support 3381da177e4SLinus Torvaldsconfig ISA_DMA 3391da177e4SLinus Torvalds bool 340065909b9SRussell King select ISA_DMA_API 3411da177e4SLinus Torvalds 342065909b9SRussell King# Select ISA DMA interface 3435cae841bSAl Viroconfig ISA_DMA_API 3445cae841bSAl Viro bool 3455cae841bSAl Viro 3461da177e4SLinus Torvaldsconfig PCI 347c0da085aSCatalin Marinas bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB 3481da177e4SLinus Torvalds help 3491da177e4SLinus Torvalds Find out whether you have a PCI motherboard. PCI is the name of a 3501da177e4SLinus Torvalds bus system, i.e. the way the CPU talks to the other stuff inside 3511da177e4SLinus Torvalds your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or 3521da177e4SLinus Torvalds VESA. If you have PCI, say Y, otherwise N. 3531da177e4SLinus Torvalds 3541da177e4SLinus Torvalds The PCI-HOWTO, available from 3551da177e4SLinus Torvalds <http://www.tldp.org/docs.html#howto>, contains valuable 3561da177e4SLinus Torvalds information about which PCI hardware does work under Linux and which 3571da177e4SLinus Torvalds doesn't. 3581da177e4SLinus Torvalds 3591da177e4SLinus Torvalds# Select the host bridge type 3601da177e4SLinus Torvaldsconfig PCI_HOST_VIA82C505 3611da177e4SLinus Torvalds bool 3621da177e4SLinus Torvalds depends on PCI && ARCH_SHARK 3631da177e4SLinus Torvalds default y 3641da177e4SLinus Torvalds 3651da177e4SLinus Torvaldssource "drivers/pci/Kconfig" 3661da177e4SLinus Torvalds 3671da177e4SLinus Torvaldssource "drivers/pcmcia/Kconfig" 3681da177e4SLinus Torvalds 3691da177e4SLinus Torvaldsendmenu 3701da177e4SLinus Torvalds 3711da177e4SLinus Torvaldsmenu "Kernel Features" 3721da177e4SLinus Torvalds 3731da177e4SLinus Torvaldsconfig SMP 3741da177e4SLinus Torvalds bool "Symmetric Multi-Processing (EXPERIMENTAL)" 375f6db449cSRussell King depends on EXPERIMENTAL && REALVIEW_MPCORE 3761da177e4SLinus Torvalds help 3771da177e4SLinus Torvalds This enables support for systems with more than one CPU. If you have 3781da177e4SLinus Torvalds a system with only one CPU, like most personal computers, say N. If 3791da177e4SLinus Torvalds you have a system with more than one CPU, say Y. 3801da177e4SLinus Torvalds 3811da177e4SLinus Torvalds If you say N here, the kernel will run on single and multiprocessor 3821da177e4SLinus Torvalds machines, but will use only one CPU of a multiprocessor machine. If 3831da177e4SLinus Torvalds you say Y here, the kernel will run on many, but not all, single 3841da177e4SLinus Torvalds processor machines. On a single processor machine, the kernel will 3851da177e4SLinus Torvalds run faster if you say N here. 3861da177e4SLinus Torvalds 38712c62c2eSArthur Othieno See also the <file:Documentation/smp.txt>, 38812c62c2eSArthur Othieno <file:Documentation/i386/IO-APIC.txt>, 3891da177e4SLinus Torvalds <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at 3901da177e4SLinus Torvalds <http://www.linuxdoc.org/docs.html#howto>. 3911da177e4SLinus Torvalds 3921da177e4SLinus Torvalds If you don't know what to do here, say N. 3931da177e4SLinus Torvalds 3941da177e4SLinus Torvaldsconfig NR_CPUS 3951da177e4SLinus Torvalds int "Maximum number of CPUs (2-32)" 3961da177e4SLinus Torvalds range 2 32 3971da177e4SLinus Torvalds depends on SMP 3981da177e4SLinus Torvalds default "4" 3991da177e4SLinus Torvalds 400a054a811SRussell Kingconfig HOTPLUG_CPU 401a054a811SRussell King bool "Support for hot-pluggable CPUs (EXPERIMENTAL)" 402a054a811SRussell King depends on SMP && HOTPLUG && EXPERIMENTAL 403a054a811SRussell King help 404a054a811SRussell King Say Y here to experiment with turning CPUs off and on. CPUs 405a054a811SRussell King can be controlled through /sys/devices/system/cpu. 406a054a811SRussell King 40737ee16aeSRussell Kingconfig LOCAL_TIMERS 40837ee16aeSRussell King bool "Use local timer interrupts" 4092a98beb6SRussell King depends on SMP && REALVIEW_MPCORE 41037ee16aeSRussell King default y 41137ee16aeSRussell King help 41237ee16aeSRussell King Enable support for local timers on SMP platforms, rather then the 41337ee16aeSRussell King legacy IPI broadcast method. Local timers allows the system 41437ee16aeSRussell King accounting to be spread across the timer interval, preventing a 41537ee16aeSRussell King "thundering herd" at every timer tick. 41637ee16aeSRussell King 4171da177e4SLinus Torvaldsconfig PREEMPT 4181da177e4SLinus Torvalds bool "Preemptible Kernel (EXPERIMENTAL)" 4191da177e4SLinus Torvalds depends on EXPERIMENTAL 4201da177e4SLinus Torvalds help 4211da177e4SLinus Torvalds This option reduces the latency of the kernel when reacting to 4221da177e4SLinus Torvalds real-time or interactive events by allowing a low priority process to 4231da177e4SLinus Torvalds be preempted even if it is in kernel mode executing a system call. 4241da177e4SLinus Torvalds This allows applications to run more reliably even when the system is 4251da177e4SLinus Torvalds under load. 4261da177e4SLinus Torvalds 4271da177e4SLinus Torvalds Say Y here if you are building a kernel for a desktop, embedded 4281da177e4SLinus Torvalds or real-time system. Say N if you are unsure. 4291da177e4SLinus Torvalds 4308749af68SRussell Kingconfig NO_IDLE_HZ 4318749af68SRussell King bool "Dynamic tick timer" 4328749af68SRussell King help 4338749af68SRussell King Select this option if you want to disable continuous timer ticks 4348749af68SRussell King and have them programmed to occur as required. This option saves 4358749af68SRussell King power as the system can remain in idle state for longer. 4368749af68SRussell King 4378749af68SRussell King By default dynamic tick is disabled during the boot, and can be 4388749af68SRussell King manually enabled with: 4398749af68SRussell King 4408749af68SRussell King echo 1 > /sys/devices/system/timer/timer0/dyn_tick 4418749af68SRussell King 4428749af68SRussell King Alternatively, if you want dynamic tick automatically enabled 4438749af68SRussell King during boot, pass "dyntick=enable" via the kernel command string. 4448749af68SRussell King 445f2be64b3STony Lindgren Please note that dynamic tick may affect the accuracy of 446f2be64b3STony Lindgren timekeeping on some platforms depending on the implementation. 447569d2c34SNicolas Pitre Currently at least OMAP, PXA2xx and SA11x0 platforms are known 448569d2c34SNicolas Pitre to have accurate timekeeping with dynamic tick. 449f2be64b3STony Lindgren 450f8065813SRussell Kingconfig HZ 451f8065813SRussell King int 452f8065813SRussell King default 128 if ARCH_L7200 453f8065813SRussell King default 200 if ARCH_EBSA110 || ARCH_S3C2410 454bfe65704SRussell King default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER 455f8065813SRussell King default 100 456f8065813SRussell King 457704bdda0SNicolas Pitreconfig AEABI 458704bdda0SNicolas Pitre bool "Use the ARM EABI to compile the kernel" 459704bdda0SNicolas Pitre help 460704bdda0SNicolas Pitre This option allows for the kernel to be compiled using the latest 461704bdda0SNicolas Pitre ARM ABI (aka EABI). This is only useful if you are using a user 462704bdda0SNicolas Pitre space environment that is also compiled with EABI. 463704bdda0SNicolas Pitre 464704bdda0SNicolas Pitre Since there are major incompatibilities between the legacy ABI and 465704bdda0SNicolas Pitre EABI, especially with regard to structure member alignment, this 466704bdda0SNicolas Pitre option also changes the kernel syscall calling convention to 467704bdda0SNicolas Pitre disambiguate both ABIs and allow for backward compatibility support 468704bdda0SNicolas Pitre (selected with CONFIG_OABI_COMPAT). 469704bdda0SNicolas Pitre 470704bdda0SNicolas Pitre To use this you need GCC version 4.0.0 or later. 471704bdda0SNicolas Pitre 4726c90c872SNicolas Pitreconfig OABI_COMPAT 473a73a3ff1SRussell King bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)" 47461c484d4SNicolas Pitre depends on AEABI && EXPERIMENTAL 4756c90c872SNicolas Pitre default y 4766c90c872SNicolas Pitre help 4776c90c872SNicolas Pitre This option preserves the old syscall interface along with the 4786c90c872SNicolas Pitre new (ARM EABI) one. It also provides a compatibility layer to 4796c90c872SNicolas Pitre intercept syscalls that have structure arguments which layout 4806c90c872SNicolas Pitre in memory differs between the legacy ABI and the new ARM EABI 4816c90c872SNicolas Pitre (only for non "thumb" binaries). This option adds a tiny 4826c90c872SNicolas Pitre overhead to all syscalls and produces a slightly larger kernel. 4836c90c872SNicolas Pitre If you know you'll be using only pure EABI user space then you 4846c90c872SNicolas Pitre can say N here. If this option is not selected and you attempt 4856c90c872SNicolas Pitre to execute a legacy ABI binary then the result will be 4866c90c872SNicolas Pitre UNPREDICTABLE (in fact it can be predicted that it won't work 4876c90c872SNicolas Pitre at all). If in doubt say Y. 4886c90c872SNicolas Pitre 4893f22ab27SDave Hansenconfig ARCH_DISCONTIGMEM_ENABLE 4901da177e4SLinus Torvalds bool 491f7e68bbfSRussell King default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM) 4921da177e4SLinus Torvalds help 4931da177e4SLinus Torvalds Say Y to support efficient handling of discontiguous physical memory, 4941da177e4SLinus Torvalds for architectures which are either NUMA (Non-Uniform Memory Access) 4951da177e4SLinus Torvalds or have huge holes in the physical address space for other reasons. 4961da177e4SLinus Torvalds See <file:Documentation/vm/numa> for more. 4971da177e4SLinus Torvalds 4983f22ab27SDave Hansensource "mm/Kconfig" 4993f22ab27SDave Hansen 5001da177e4SLinus Torvaldsconfig LEDS 5011da177e4SLinus Torvalds bool "Timer and CPU usage LEDs" 5021da177e4SLinus Torvalds depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \ 5031da177e4SLinus Torvalds ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \ 5041da177e4SLinus Torvalds ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \ 5051da177e4SLinus Torvalds ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \ 50673a59c1cSSAN People ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \ 50773a59c1cSSAN People ARCH_AT91RM9200 5081da177e4SLinus Torvalds help 5091da177e4SLinus Torvalds If you say Y here, the LEDs on your machine will be used 5101da177e4SLinus Torvalds to provide useful information about your current system status. 5111da177e4SLinus Torvalds 5121da177e4SLinus Torvalds If you are compiling a kernel for a NetWinder or EBSA-285, you will 5131da177e4SLinus Torvalds be able to select which LEDs are active using the options below. If 5141da177e4SLinus Torvalds you are compiling a kernel for the EBSA-110 or the LART however, the 5151da177e4SLinus Torvalds red LED will simply flash regularly to indicate that the system is 5161da177e4SLinus Torvalds still functional. It is safe to say Y here if you have a CATS 5171da177e4SLinus Torvalds system, but the driver will do nothing. 5181da177e4SLinus Torvalds 5191da177e4SLinus Torvaldsconfig LEDS_TIMER 5201da177e4SLinus Torvalds bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \ 5211da177e4SLinus Torvalds MACH_OMAP_H2 || MACH_OMAP_PERSEUS2 5221da177e4SLinus Torvalds depends on LEDS 5231da177e4SLinus Torvalds default y if ARCH_EBSA110 5241da177e4SLinus Torvalds help 5251da177e4SLinus Torvalds If you say Y here, one of the system LEDs (the green one on the 5261da177e4SLinus Torvalds NetWinder, the amber one on the EBSA285, or the red one on the LART) 5271da177e4SLinus Torvalds will flash regularly to indicate that the system is still 5281da177e4SLinus Torvalds operational. This is mainly useful to kernel hackers who are 5291da177e4SLinus Torvalds debugging unstable kernels. 5301da177e4SLinus Torvalds 5311da177e4SLinus Torvalds The LART uses the same LED for both Timer LED and CPU usage LED 5321da177e4SLinus Torvalds functions. You may choose to use both, but the Timer LED function 5331da177e4SLinus Torvalds will overrule the CPU usage LED. 5341da177e4SLinus Torvalds 5351da177e4SLinus Torvaldsconfig LEDS_CPU 5361da177e4SLinus Torvalds bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \ 5371da177e4SLinus Torvalds !ARCH_OMAP) || MACH_OMAP_H2 || MACH_OMAP_PERSEUS2 5381da177e4SLinus Torvalds depends on LEDS 5391da177e4SLinus Torvalds help 5401da177e4SLinus Torvalds If you say Y here, the red LED will be used to give a good real 5411da177e4SLinus Torvalds time indication of CPU usage, by lighting whenever the idle task 5421da177e4SLinus Torvalds is not currently executing. 5431da177e4SLinus Torvalds 5441da177e4SLinus Torvalds The LART uses the same LED for both Timer LED and CPU usage LED 5451da177e4SLinus Torvalds functions. You may choose to use both, but the Timer LED function 5461da177e4SLinus Torvalds will overrule the CPU usage LED. 5471da177e4SLinus Torvalds 5481da177e4SLinus Torvaldsconfig ALIGNMENT_TRAP 5491da177e4SLinus Torvalds bool 5501da177e4SLinus Torvalds default y if !ARCH_EBSA110 5511da177e4SLinus Torvalds help 5521da177e4SLinus Torvalds ARM processors can not fetch/store information which is not 5531da177e4SLinus Torvalds naturally aligned on the bus, i.e., a 4 byte fetch must start at an 5541da177e4SLinus Torvalds address divisible by 4. On 32-bit ARM processors, these non-aligned 5551da177e4SLinus Torvalds fetch/store instructions will be emulated in software if you say 5561da177e4SLinus Torvalds here, which has a severe performance impact. This is necessary for 5571da177e4SLinus Torvalds correct operation of some network protocols. With an IP-only 5581da177e4SLinus Torvalds configuration it is safe to say N, otherwise say Y. 5591da177e4SLinus Torvalds 5601da177e4SLinus Torvaldsendmenu 5611da177e4SLinus Torvalds 5621da177e4SLinus Torvaldsmenu "Boot options" 5631da177e4SLinus Torvalds 5641da177e4SLinus Torvalds# Compressed boot loader in ROM. Yes, we really want to ask about 5651da177e4SLinus Torvalds# TEXT and BSS so we preserve their values in the config files. 5661da177e4SLinus Torvaldsconfig ZBOOT_ROM_TEXT 5671da177e4SLinus Torvalds hex "Compressed ROM boot loader base address" 5681da177e4SLinus Torvalds default "0" 5691da177e4SLinus Torvalds help 5701da177e4SLinus Torvalds The physical address at which the ROM-able zImage is to be 5711da177e4SLinus Torvalds placed in the target. Platforms which normally make use of 5721da177e4SLinus Torvalds ROM-able zImage formats normally set this to a suitable 5731da177e4SLinus Torvalds value in their defconfig file. 5741da177e4SLinus Torvalds 5751da177e4SLinus Torvalds If ZBOOT_ROM is not enabled, this has no effect. 5761da177e4SLinus Torvalds 5771da177e4SLinus Torvaldsconfig ZBOOT_ROM_BSS 5781da177e4SLinus Torvalds hex "Compressed ROM boot loader BSS address" 5791da177e4SLinus Torvalds default "0" 5801da177e4SLinus Torvalds help 5811da177e4SLinus Torvalds The base address of 64KiB of read/write memory in the target 5821da177e4SLinus Torvalds for the ROM-able zImage, which must be available while the 5831da177e4SLinus Torvalds decompressor is running. Platforms which normally make use of 5841da177e4SLinus Torvalds ROM-able zImage formats normally set this to a suitable 5851da177e4SLinus Torvalds value in their defconfig file. 5861da177e4SLinus Torvalds 5871da177e4SLinus Torvalds If ZBOOT_ROM is not enabled, this has no effect. 5881da177e4SLinus Torvalds 5891da177e4SLinus Torvaldsconfig ZBOOT_ROM 5901da177e4SLinus Torvalds bool "Compressed boot loader in ROM/flash" 5911da177e4SLinus Torvalds depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS 5921da177e4SLinus Torvalds help 5931da177e4SLinus Torvalds Say Y here if you intend to execute your compressed kernel image 5941da177e4SLinus Torvalds (zImage) directly from ROM or flash. If unsure, say N. 5951da177e4SLinus Torvalds 5961da177e4SLinus Torvaldsconfig CMDLINE 5971da177e4SLinus Torvalds string "Default kernel command string" 5981da177e4SLinus Torvalds default "" 5991da177e4SLinus Torvalds help 6001da177e4SLinus Torvalds On some architectures (EBSA110 and CATS), there is currently no way 6011da177e4SLinus Torvalds for the boot loader to pass arguments to the kernel. For these 6021da177e4SLinus Torvalds architectures, you should supply some command-line options at build 6031da177e4SLinus Torvalds time by entering them here. As a minimum, you should specify the 6041da177e4SLinus Torvalds memory size and the root device (e.g., mem=64M root=/dev/nfs). 6051da177e4SLinus Torvalds 6061da177e4SLinus Torvaldsconfig XIP_KERNEL 6071da177e4SLinus Torvalds bool "Kernel Execute-In-Place from ROM" 6081da177e4SLinus Torvalds depends on !ZBOOT_ROM 6091da177e4SLinus Torvalds help 6101da177e4SLinus Torvalds Execute-In-Place allows the kernel to run from non-volatile storage 6111da177e4SLinus Torvalds directly addressable by the CPU, such as NOR flash. This saves RAM 6121da177e4SLinus Torvalds space since the text section of the kernel is not loaded from flash 6131da177e4SLinus Torvalds to RAM. Read-write sections, such as the data section and stack, 6141da177e4SLinus Torvalds are still copied to RAM. The XIP kernel is not compressed since 6151da177e4SLinus Torvalds it has to run directly from flash, so it will take more space to 6161da177e4SLinus Torvalds store it. The flash address used to link the kernel object files, 6171da177e4SLinus Torvalds and for storing it, is configuration dependent. Therefore, if you 6181da177e4SLinus Torvalds say Y here, you must know the proper physical address where to 6191da177e4SLinus Torvalds store the kernel image depending on your own flash memory usage. 6201da177e4SLinus Torvalds 6211da177e4SLinus Torvalds Also note that the make target becomes "make xipImage" rather than 6221da177e4SLinus Torvalds "make zImage" or "make Image". The final kernel binary to put in 6231da177e4SLinus Torvalds ROM memory will be arch/arm/boot/xipImage. 6241da177e4SLinus Torvalds 6251da177e4SLinus Torvalds If unsure, say N. 6261da177e4SLinus Torvalds 6271da177e4SLinus Torvaldsconfig XIP_PHYS_ADDR 6281da177e4SLinus Torvalds hex "XIP Kernel Physical Location" 6291da177e4SLinus Torvalds depends on XIP_KERNEL 6301da177e4SLinus Torvalds default "0x00080000" 6311da177e4SLinus Torvalds help 6321da177e4SLinus Torvalds This is the physical address in your flash memory the kernel will 6331da177e4SLinus Torvalds be linked for and stored to. This address is dependent on your 6341da177e4SLinus Torvalds own flash usage. 6351da177e4SLinus Torvalds 6361da177e4SLinus Torvaldsendmenu 6371da177e4SLinus Torvalds 638ec6bced6STony Lindgrenif (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP1) 6391da177e4SLinus Torvalds 6401da177e4SLinus Torvaldsmenu "CPU Frequency scaling" 6411da177e4SLinus Torvalds 6421da177e4SLinus Torvaldssource "drivers/cpufreq/Kconfig" 6431da177e4SLinus Torvalds 6441da177e4SLinus Torvaldsconfig CPU_FREQ_SA1100 6451da177e4SLinus Torvalds bool 64607c6d48fSVincent Sanders depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT) 6471da177e4SLinus Torvalds default y 6481da177e4SLinus Torvalds 6491da177e4SLinus Torvaldsconfig CPU_FREQ_SA1110 6501da177e4SLinus Torvalds bool 6511da177e4SLinus Torvalds depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3) 6521da177e4SLinus Torvalds default y 6531da177e4SLinus Torvalds 6541da177e4SLinus Torvaldsconfig CPU_FREQ_INTEGRATOR 6551da177e4SLinus Torvalds tristate "CPUfreq driver for ARM Integrator CPUs" 6561da177e4SLinus Torvalds depends on ARCH_INTEGRATOR && CPU_FREQ 6571da177e4SLinus Torvalds default y 6581da177e4SLinus Torvalds help 6591da177e4SLinus Torvalds This enables the CPUfreq driver for ARM Integrator CPUs. 6601da177e4SLinus Torvalds 6611da177e4SLinus Torvalds For details, take a look at <file:Documentation/cpu-freq>. 6621da177e4SLinus Torvalds 6631da177e4SLinus Torvalds If in doubt, say Y. 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvaldsendmenu 6661da177e4SLinus Torvalds 6671da177e4SLinus Torvaldsendif 6681da177e4SLinus Torvalds 6691da177e4SLinus Torvaldsmenu "Floating point emulation" 6701da177e4SLinus Torvalds 6711da177e4SLinus Torvaldscomment "At least one emulation must be selected" 6721da177e4SLinus Torvalds 6731da177e4SLinus Torvaldsconfig FPE_NWFPE 6741da177e4SLinus Torvalds bool "NWFPE math emulation" 6758993a44cSNicolas Pitre depends on !AEABI || OABI_COMPAT 6761da177e4SLinus Torvalds ---help--- 6771da177e4SLinus Torvalds Say Y to include the NWFPE floating point emulator in the kernel. 6781da177e4SLinus Torvalds This is necessary to run most binaries. Linux does not currently 6791da177e4SLinus Torvalds support floating point hardware so you need to say Y here even if 6801da177e4SLinus Torvalds your machine has an FPA or floating point co-processor podule. 6811da177e4SLinus Torvalds 6821da177e4SLinus Torvalds You may say N here if you are going to load the Acorn FPEmulator 6831da177e4SLinus Torvalds early in the bootup. 6841da177e4SLinus Torvalds 6851da177e4SLinus Torvaldsconfig FPE_NWFPE_XP 6861da177e4SLinus Torvalds bool "Support extended precision" 687bedf142bSLennert Buytenhek depends on FPE_NWFPE 6881da177e4SLinus Torvalds help 6891da177e4SLinus Torvalds Say Y to include 80-bit support in the kernel floating-point 6901da177e4SLinus Torvalds emulator. Otherwise, only 32 and 64-bit support is compiled in. 6911da177e4SLinus Torvalds Note that gcc does not generate 80-bit operations by default, 6921da177e4SLinus Torvalds so in most cases this option only enlarges the size of the 6931da177e4SLinus Torvalds floating point emulator without any good reason. 6941da177e4SLinus Torvalds 6951da177e4SLinus Torvalds You almost surely want to say N here. 6961da177e4SLinus Torvalds 6971da177e4SLinus Torvaldsconfig FPE_FASTFPE 6981da177e4SLinus Torvalds bool "FastFPE math emulation (EXPERIMENTAL)" 6998993a44cSNicolas Pitre depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL 7001da177e4SLinus Torvalds ---help--- 7011da177e4SLinus Torvalds Say Y here to include the FAST floating point emulator in the kernel. 7021da177e4SLinus Torvalds This is an experimental much faster emulator which now also has full 7031da177e4SLinus Torvalds precision for the mantissa. It does not support any exceptions. 7041da177e4SLinus Torvalds It is very simple, and approximately 3-6 times faster than NWFPE. 7051da177e4SLinus Torvalds 7061da177e4SLinus Torvalds It should be sufficient for most programs. It may be not suitable 7071da177e4SLinus Torvalds for scientific calculations, but you have to check this for yourself. 7081da177e4SLinus Torvalds If you do not feel you need a faster FP emulation you should better 7091da177e4SLinus Torvalds choose NWFPE. 7101da177e4SLinus Torvalds 7111da177e4SLinus Torvaldsconfig VFP 7121da177e4SLinus Torvalds bool "VFP-format floating point maths" 7131da177e4SLinus Torvalds depends on CPU_V6 || CPU_ARM926T 7141da177e4SLinus Torvalds help 7151da177e4SLinus Torvalds Say Y to include VFP support code in the kernel. This is needed 7161da177e4SLinus Torvalds if your hardware includes a VFP unit. 7171da177e4SLinus Torvalds 7181da177e4SLinus Torvalds Please see <file:Documentation/arm/VFP/release-notes.txt> for 7191da177e4SLinus Torvalds release notes and additional status information. 7201da177e4SLinus Torvalds 7211da177e4SLinus Torvalds Say N if your target does not have VFP hardware. 7221da177e4SLinus Torvalds 7231da177e4SLinus Torvaldsendmenu 7241da177e4SLinus Torvalds 7251da177e4SLinus Torvaldsmenu "Userspace binary formats" 7261da177e4SLinus Torvalds 7271da177e4SLinus Torvaldssource "fs/Kconfig.binfmt" 7281da177e4SLinus Torvalds 7291da177e4SLinus Torvaldsconfig ARTHUR 7301da177e4SLinus Torvalds tristate "RISC OS personality" 731704bdda0SNicolas Pitre depends on !AEABI 7321da177e4SLinus Torvalds help 7331da177e4SLinus Torvalds Say Y here to include the kernel code necessary if you want to run 7341da177e4SLinus Torvalds Acorn RISC OS/Arthur binaries under Linux. This code is still very 7351da177e4SLinus Torvalds experimental; if this sounds frightening, say N and sleep in peace. 7361da177e4SLinus Torvalds You can also say M here to compile this support as a module (which 7371da177e4SLinus Torvalds will be called arthur). 7381da177e4SLinus Torvalds 7391da177e4SLinus Torvaldsendmenu 7401da177e4SLinus Torvalds 7411da177e4SLinus Torvaldsmenu "Power management options" 7421da177e4SLinus Torvalds 743eceab4acSRussell Kingsource "kernel/power/Kconfig" 7441da177e4SLinus Torvalds 7451da177e4SLinus Torvaldsconfig APM 7461da177e4SLinus Torvalds tristate "Advanced Power Management Emulation" 7471da177e4SLinus Torvalds ---help--- 7481da177e4SLinus Torvalds APM is a BIOS specification for saving power using several different 7491da177e4SLinus Torvalds techniques. This is mostly useful for battery powered laptops with 7501da177e4SLinus Torvalds APM compliant BIOSes. If you say Y here, the system time will be 7511da177e4SLinus Torvalds reset after a RESUME operation, the /proc/apm device will provide 7521da177e4SLinus Torvalds battery status information, and user-space programs will receive 7531da177e4SLinus Torvalds notification of APM "events" (e.g. battery status change). 7541da177e4SLinus Torvalds 7551da177e4SLinus Torvalds In order to use APM, you will need supporting software. For location 7561da177e4SLinus Torvalds and more information, read <file:Documentation/pm.txt> and the 7571da177e4SLinus Torvalds Battery Powered Linux mini-HOWTO, available from 7581da177e4SLinus Torvalds <http://www.tldp.org/docs.html#howto>. 7591da177e4SLinus Torvalds 7601da177e4SLinus Torvalds This driver does not spin down disk drives (see the hdparm(8) 7611da177e4SLinus Torvalds manpage ("man 8 hdparm") for that), and it doesn't turn off 7621da177e4SLinus Torvalds VESA-compliant "green" monitors. 7631da177e4SLinus Torvalds 7641da177e4SLinus Torvalds Generally, if you don't have a battery in your machine, there isn't 7651da177e4SLinus Torvalds much point in using this driver and you should say N. If you get 7661da177e4SLinus Torvalds random kernel OOPSes or reboots that don't seem to be related to 7671da177e4SLinus Torvalds anything, try disabling/enabling this option (or disabling/enabling 7681da177e4SLinus Torvalds APM in your BIOS). 7691da177e4SLinus Torvalds 7701da177e4SLinus Torvaldsendmenu 7711da177e4SLinus Torvalds 772d5950b43SSam Ravnborgsource "net/Kconfig" 773d5950b43SSam Ravnborg 7741da177e4SLinus Torvaldsmenu "Device Drivers" 7751da177e4SLinus Torvalds 7761da177e4SLinus Torvaldssource "drivers/base/Kconfig" 7771da177e4SLinus Torvalds 778c35bf4a5SPavel Macheksource "drivers/connector/Kconfig" 779c35bf4a5SPavel Machek 7801da177e4SLinus Torvaldsif ALIGNMENT_TRAP 7811da177e4SLinus Torvaldssource "drivers/mtd/Kconfig" 7821da177e4SLinus Torvaldsendif 7831da177e4SLinus Torvalds 7841da177e4SLinus Torvaldssource "drivers/parport/Kconfig" 7851da177e4SLinus Torvalds 7861da177e4SLinus Torvaldssource "drivers/pnp/Kconfig" 7871da177e4SLinus Torvalds 7881da177e4SLinus Torvaldssource "drivers/block/Kconfig" 7891da177e4SLinus Torvalds 7901da177e4SLinus Torvaldssource "drivers/acorn/block/Kconfig" 7911da177e4SLinus Torvalds 792bb011b8eSDavid Brownellif PCMCIA || ARCH_CLPS7500 || ARCH_IOP3XX || ARCH_IXP4XX \ 793bb011b8eSDavid Brownell || ARCH_L7200 || ARCH_LH7A40X || ARCH_PXA || ARCH_RPC \ 794d56c524aSRussell King || ARCH_S3C2410 || ARCH_SA1100 || ARCH_SHARK || FOOTBRIDGE 7951da177e4SLinus Torvaldssource "drivers/ide/Kconfig" 7961da177e4SLinus Torvaldsendif 7971da177e4SLinus Torvalds 7981da177e4SLinus Torvaldssource "drivers/scsi/Kconfig" 7991da177e4SLinus Torvalds 8001da177e4SLinus Torvaldssource "drivers/md/Kconfig" 8011da177e4SLinus Torvalds 8021da177e4SLinus Torvaldssource "drivers/message/fusion/Kconfig" 8031da177e4SLinus Torvalds 8041da177e4SLinus Torvaldssource "drivers/ieee1394/Kconfig" 8051da177e4SLinus Torvalds 8061da177e4SLinus Torvaldssource "drivers/message/i2o/Kconfig" 8071da177e4SLinus Torvalds 808d5950b43SSam Ravnborgsource "drivers/net/Kconfig" 8091da177e4SLinus Torvalds 8101da177e4SLinus Torvaldssource "drivers/isdn/Kconfig" 8111da177e4SLinus Torvalds 8121da177e4SLinus Torvalds# input before char - char/joystick depends on it. As does USB. 8131da177e4SLinus Torvalds 8141da177e4SLinus Torvaldssource "drivers/input/Kconfig" 8151da177e4SLinus Torvalds 8161da177e4SLinus Torvaldssource "drivers/char/Kconfig" 8171da177e4SLinus Torvalds 8181da177e4SLinus Torvaldssource "drivers/i2c/Kconfig" 8191da177e4SLinus Torvalds 8208ae12a0dSDavid Brownellsource "drivers/spi/Kconfig" 8218ae12a0dSDavid Brownell 82204916c0eSAlessandro Zummosource "drivers/w1/Kconfig" 82304916c0eSAlessandro Zummo 824ad2f931dSJean Delvaresource "drivers/hwmon/Kconfig" 825ad2f931dSJean Delvare 8261da177e4SLinus Torvalds#source "drivers/l3/Kconfig" 8271da177e4SLinus Torvalds 8281da177e4SLinus Torvaldssource "drivers/misc/Kconfig" 8291da177e4SLinus Torvalds 830a4e137abSRussell Kingsource "drivers/mfd/Kconfig" 831a4e137abSRussell King 8321da177e4SLinus Torvaldssource "drivers/media/Kconfig" 8331da177e4SLinus Torvalds 8341da177e4SLinus Torvaldssource "drivers/video/Kconfig" 8351da177e4SLinus Torvalds 8361da177e4SLinus Torvaldssource "sound/Kconfig" 8371da177e4SLinus Torvalds 8381da177e4SLinus Torvaldssource "drivers/usb/Kconfig" 8391da177e4SLinus Torvalds 8401da177e4SLinus Torvaldssource "drivers/mmc/Kconfig" 8411da177e4SLinus Torvalds 8421da177e4SLinus Torvaldsendmenu 8431da177e4SLinus Torvalds 8441da177e4SLinus Torvaldssource "fs/Kconfig" 8451da177e4SLinus Torvalds 8461da177e4SLinus Torvaldssource "arch/arm/oprofile/Kconfig" 8471da177e4SLinus Torvalds 8481da177e4SLinus Torvaldssource "arch/arm/Kconfig.debug" 8491da177e4SLinus Torvalds 8501da177e4SLinus Torvaldssource "security/Kconfig" 8511da177e4SLinus Torvalds 8521da177e4SLinus Torvaldssource "crypto/Kconfig" 8531da177e4SLinus Torvalds 8541da177e4SLinus Torvaldssource "lib/Kconfig" 855