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 561da177e4SLinus Torvaldsconfig GENERIC_CALIBRATE_DELAY 571da177e4SLinus Torvalds bool 581da177e4SLinus Torvalds default y 591da177e4SLinus Torvalds 601da177e4SLinus Torvaldsconfig GENERIC_BUST_SPINLOCK 611da177e4SLinus Torvalds bool 621da177e4SLinus Torvalds 63a08b6b79Sviro@ZenIV.linux.org.ukconfig ARCH_MAY_HAVE_PC_FDC 64a08b6b79Sviro@ZenIV.linux.org.uk bool 65a08b6b79Sviro@ZenIV.linux.org.uk 661da177e4SLinus Torvaldsconfig GENERIC_ISA_DMA 671da177e4SLinus Torvalds bool 681da177e4SLinus Torvalds 691da177e4SLinus Torvaldsconfig FIQ 701da177e4SLinus Torvalds bool 711da177e4SLinus Torvalds 72034d2f5aSAl Viroconfig ARCH_MTD_XIP 73034d2f5aSAl Viro bool 74034d2f5aSAl Viro 751da177e4SLinus Torvaldssource "init/Kconfig" 761da177e4SLinus Torvalds 771da177e4SLinus Torvaldsmenu "System Type" 781da177e4SLinus Torvalds 791da177e4SLinus Torvaldschoice 801da177e4SLinus Torvalds prompt "ARM system type" 816a0e2430SCatalin Marinas default ARCH_VERSATILE 821da177e4SLinus Torvalds 831da177e4SLinus Torvaldsconfig ARCH_CLPS7500 841da177e4SLinus Torvalds bool "Cirrus-CL-PS7500FE" 851da177e4SLinus Torvalds select TIMER_ACORN 86f7e68bbfSRussell King select ISA 87f999b8bdSMartin Michlmayr help 88f999b8bdSMartin Michlmayr Support for the Cirrus Logic PS7500FE system-on-a-chip. 891da177e4SLinus Torvalds 901da177e4SLinus Torvaldsconfig ARCH_CLPS711X 911da177e4SLinus Torvalds bool "CLPS711x/EP721x-based" 92f999b8bdSMartin Michlmayr help 93f999b8bdSMartin Michlmayr Support for Cirrus Logic 711x/721x based boards. 941da177e4SLinus Torvalds 951da177e4SLinus Torvaldsconfig ARCH_CO285 961da177e4SLinus Torvalds bool "Co-EBSA285" 971da177e4SLinus Torvalds select FOOTBRIDGE 981da177e4SLinus Torvalds select FOOTBRIDGE_ADDIN 99f999b8bdSMartin Michlmayr help 100f999b8bdSMartin Michlmayr Support for Intel's EBSA285 companion chip. 1011da177e4SLinus Torvalds 1021da177e4SLinus Torvaldsconfig ARCH_EBSA110 1031da177e4SLinus Torvalds bool "EBSA-110" 104f7e68bbfSRussell King select ISA 1051da177e4SLinus Torvalds help 1061da177e4SLinus Torvalds This is an evaluation board for the StrongARM processor available 107f6c8965aSMartin Michlmayr from Digital. It has limited hardware on-board, including an 1081da177e4SLinus Torvalds Ethernet interface, two PCMCIA sockets, two serial ports and a 1091da177e4SLinus Torvalds parallel port. 1101da177e4SLinus Torvalds 111e7736d47SLennert Buytenhekconfig ARCH_EP93XX 112e7736d47SLennert Buytenhek bool "EP93xx-based" 113e7736d47SLennert Buytenhek select ARM_AMBA 114e7736d47SLennert Buytenhek select ARM_VIC 115e7736d47SLennert Buytenhek help 116e7736d47SLennert Buytenhek This enables support for the Cirrus EP93xx series of CPUs. 117e7736d47SLennert Buytenhek 1181da177e4SLinus Torvaldsconfig ARCH_FOOTBRIDGE 1191da177e4SLinus Torvalds bool "FootBridge" 1201da177e4SLinus Torvalds select FOOTBRIDGE 121f999b8bdSMartin Michlmayr help 122f999b8bdSMartin Michlmayr Support for systems based on the DC21285 companion chip 123f999b8bdSMartin Michlmayr ("FootBridge"), such as the Simtec CATS and the Rebel NetWinder. 1241da177e4SLinus Torvalds 1251da177e4SLinus Torvaldsconfig ARCH_INTEGRATOR 1261da177e4SLinus Torvalds bool "Integrator" 1271da177e4SLinus Torvalds select ARM_AMBA 1281da177e4SLinus Torvalds select ICST525 129f999b8bdSMartin Michlmayr help 130f999b8bdSMartin Michlmayr Support for ARM's Integrator platform. 1311da177e4SLinus Torvalds 1321da177e4SLinus Torvaldsconfig ARCH_IOP3XX 1331da177e4SLinus Torvalds bool "IOP3xx-based" 134f7e68bbfSRussell King select PCI 135f999b8bdSMartin Michlmayr help 136f999b8bdSMartin Michlmayr Support for Intel's IOP3XX (XScale) family of processors. 1371da177e4SLinus Torvalds 1381da177e4SLinus Torvaldsconfig ARCH_IXP4XX 1391da177e4SLinus Torvalds bool "IXP4xx-based" 1401da177e4SLinus Torvalds select DMABOUNCE 141f7e68bbfSRussell King select PCI 142f999b8bdSMartin Michlmayr help 143f999b8bdSMartin Michlmayr Support for Intel's IXP4XX (XScale) family of processors. 1441da177e4SLinus Torvalds 1451da177e4SLinus Torvaldsconfig ARCH_IXP2000 1461da177e4SLinus Torvalds bool "IXP2400/2800-based" 147f7e68bbfSRussell King select PCI 148f999b8bdSMartin Michlmayr help 149f999b8bdSMartin Michlmayr Support for Intel's IXP2400/2800 (XScale) family of processors. 1501da177e4SLinus Torvalds 151*c4713074SLennert Buytenhekconfig ARCH_IXP23XX 152*c4713074SLennert Buytenhek bool "IXP23XX-based" 153*c4713074SLennert Buytenhek select PCI 154*c4713074SLennert Buytenhek help 155*c4713074SLennert Buytenhek Support for Intel's IXP23xx (XScale) family of processors. 156*c4713074SLennert Buytenhek 1571da177e4SLinus Torvaldsconfig ARCH_L7200 1581da177e4SLinus Torvalds bool "LinkUp-L7200" 1591da177e4SLinus Torvalds select FIQ 1601da177e4SLinus Torvalds help 1611da177e4SLinus Torvalds Say Y here if you intend to run this kernel on a LinkUp Systems 1621da177e4SLinus Torvalds L7200 Software Development Board which uses an ARM720T processor. 1631da177e4SLinus Torvalds Information on this board can be obtained at: 1641da177e4SLinus Torvalds 1651da177e4SLinus Torvalds <http://www.linkupsys.com/> 1661da177e4SLinus Torvalds 1671da177e4SLinus Torvalds If you have any questions or comments about the Linux kernel port 1681da177e4SLinus Torvalds to this board, send e-mail to <sjhill@cotw.com>. 1691da177e4SLinus Torvalds 1701da177e4SLinus Torvaldsconfig ARCH_PXA 1711da177e4SLinus Torvalds bool "PXA2xx-based" 172034d2f5aSAl Viro select ARCH_MTD_XIP 173f999b8bdSMartin Michlmayr help 174f999b8bdSMartin Michlmayr Support for Intel's PXA2XX processor line. 1751da177e4SLinus Torvalds 1761da177e4SLinus Torvaldsconfig ARCH_RPC 1771da177e4SLinus Torvalds bool "RiscPC" 1781da177e4SLinus Torvalds select ARCH_ACORN 1791da177e4SLinus Torvalds select FIQ 1801da177e4SLinus Torvalds select TIMER_ACORN 181a08b6b79Sviro@ZenIV.linux.org.uk select ARCH_MAY_HAVE_PC_FDC 182065909b9SRussell King select ISA_DMA_API 1831da177e4SLinus Torvalds help 1841da177e4SLinus Torvalds On the Acorn Risc-PC, Linux can support the internal IDE disk and 1851da177e4SLinus Torvalds CD-ROM interface, serial and parallel port, and the floppy drive. 1861da177e4SLinus Torvalds 1871da177e4SLinus Torvaldsconfig ARCH_SA1100 1881da177e4SLinus Torvalds bool "SA1100-based" 189f7e68bbfSRussell King select ISA 1903cd9e19eSRussell King select ARCH_DISCONTIGMEM_ENABLE 191034d2f5aSAl Viro select ARCH_MTD_XIP 192f999b8bdSMartin Michlmayr help 193f999b8bdSMartin Michlmayr Support for StrongARM 11x0 based boards. 1941da177e4SLinus Torvalds 1951da177e4SLinus Torvaldsconfig ARCH_S3C2410 1961da177e4SLinus Torvalds bool "Samsung S3C2410" 1971da177e4SLinus Torvalds help 1981da177e4SLinus Torvalds Samsung S3C2410X CPU based systems, such as the Simtec Electronics 1991da177e4SLinus Torvalds BAST (<http://www.simtec.co.uk/products/EB110ITX/>), the IPAQ 1940 or 200f6c8965aSMartin Michlmayr the Samsung SMDK2410 development board (and derivatives). 2011da177e4SLinus Torvalds 2021da177e4SLinus Torvaldsconfig ARCH_SHARK 2031da177e4SLinus Torvalds bool "Shark" 204f7e68bbfSRussell King select ISA 205f7e68bbfSRussell King select ISA_DMA 206f7e68bbfSRussell King select PCI 207f999b8bdSMartin Michlmayr help 208f999b8bdSMartin Michlmayr Support for the StrongARM based Digital DNARD machine, also known 209f999b8bdSMartin Michlmayr as "Shark" (<http://www.shark-linux.de/shark.html>). 2101da177e4SLinus Torvalds 2111da177e4SLinus Torvaldsconfig ARCH_LH7A40X 2121da177e4SLinus Torvalds bool "Sharp LH7A40X" 2131da177e4SLinus Torvalds help 2141da177e4SLinus Torvalds Say Y here for systems based on one of the Sharp LH7A40X 2151da177e4SLinus Torvalds System on a Chip processors. These CPUs include an ARM922T 2161da177e4SLinus Torvalds core with a wide array of integrated devices for 2171da177e4SLinus Torvalds hand-held and low-power applications. 2181da177e4SLinus Torvalds 2191da177e4SLinus Torvaldsconfig ARCH_OMAP 2201da177e4SLinus Torvalds bool "TI OMAP" 221f999b8bdSMartin Michlmayr help 222f999b8bdSMartin Michlmayr Support for TI's OMAP platform (OMAP1 and OMAP2). 2231da177e4SLinus Torvalds 2241da177e4SLinus Torvaldsconfig ARCH_VERSATILE 2251da177e4SLinus Torvalds bool "Versatile" 2261da177e4SLinus Torvalds select ARM_AMBA 227fa0fe48fSRussell King select ARM_VIC 2281da177e4SLinus Torvalds select ICST307 2291da177e4SLinus Torvalds help 2301da177e4SLinus Torvalds This enables support for ARM Ltd Versatile board. 2311da177e4SLinus Torvalds 2328ad68bbfSCatalin Marinasconfig ARCH_REALVIEW 2338ad68bbfSCatalin Marinas bool "RealView" 2348ad68bbfSCatalin Marinas select ARM_AMBA 2358ad68bbfSCatalin Marinas select ICST307 2368ad68bbfSCatalin Marinas help 2378ad68bbfSCatalin Marinas This enables support for ARM Ltd RealView boards. 2388ad68bbfSCatalin Marinas 2391da177e4SLinus Torvaldsconfig ARCH_IMX 2401da177e4SLinus Torvalds bool "IMX" 241f999b8bdSMartin Michlmayr help 242f999b8bdSMartin Michlmayr Support for Motorola's i.MX family of processors (MX1, MXL). 2431da177e4SLinus Torvalds 2441da177e4SLinus Torvaldsconfig ARCH_H720X 2451da177e4SLinus Torvalds bool "Hynix-HMS720x-based" 246065909b9SRussell King select ISA_DMA_API 2471da177e4SLinus Torvalds help 2481da177e4SLinus Torvalds This enables support for systems based on the Hynix HMS720x 2491da177e4SLinus Torvalds 250038c5b60SBellido Nicolasconfig ARCH_AAEC2000 251038c5b60SBellido Nicolas bool "Agilent AAEC-2000 based" 252049eb329SBellido Nicolas select ARM_AMBA 253038c5b60SBellido Nicolas help 254038c5b60SBellido Nicolas This enables support for systems based on the Agilent AAEC-2000 255038c5b60SBellido Nicolas 25673a59c1cSSAN Peopleconfig ARCH_AT91RM9200 25773a59c1cSSAN People bool "AT91RM9200" 25873a59c1cSSAN People help 259f999b8bdSMartin Michlmayr Say Y here if you intend to run this kernel on an Atmel 260f999b8bdSMartin Michlmayr AT91RM9200-based board. 26173a59c1cSSAN People 2621da177e4SLinus Torvaldsendchoice 2631da177e4SLinus Torvalds 2641da177e4SLinus Torvaldssource "arch/arm/mach-clps711x/Kconfig" 2651da177e4SLinus Torvalds 266e7736d47SLennert Buytenheksource "arch/arm/mach-ep93xx/Kconfig" 267e7736d47SLennert Buytenhek 2681da177e4SLinus Torvaldssource "arch/arm/mach-footbridge/Kconfig" 2691da177e4SLinus Torvalds 2701da177e4SLinus Torvaldssource "arch/arm/mach-integrator/Kconfig" 2711da177e4SLinus Torvalds 2721da177e4SLinus Torvaldssource "arch/arm/mach-iop3xx/Kconfig" 2731da177e4SLinus Torvalds 2741da177e4SLinus Torvaldssource "arch/arm/mach-ixp4xx/Kconfig" 2751da177e4SLinus Torvalds 2761da177e4SLinus Torvaldssource "arch/arm/mach-ixp2000/Kconfig" 2771da177e4SLinus Torvalds 278*c4713074SLennert Buytenheksource "arch/arm/mach-ixp23xx/Kconfig" 279*c4713074SLennert Buytenhek 2801da177e4SLinus Torvaldssource "arch/arm/mach-pxa/Kconfig" 2811da177e4SLinus Torvalds 2821da177e4SLinus Torvaldssource "arch/arm/mach-sa1100/Kconfig" 2831da177e4SLinus Torvalds 284d48af15eSTony Lindgrensource "arch/arm/plat-omap/Kconfig" 285d48af15eSTony Lindgren 286d48af15eSTony Lindgrensource "arch/arm/mach-omap1/Kconfig" 2871da177e4SLinus Torvalds 2881dbae815STony Lindgrensource "arch/arm/mach-omap2/Kconfig" 2891dbae815STony Lindgren 2901da177e4SLinus Torvaldssource "arch/arm/mach-s3c2410/Kconfig" 2911da177e4SLinus Torvalds 2921da177e4SLinus Torvaldssource "arch/arm/mach-lh7a40x/Kconfig" 2931da177e4SLinus Torvalds 2941da177e4SLinus Torvaldssource "arch/arm/mach-imx/Kconfig" 2951da177e4SLinus Torvalds 2961da177e4SLinus Torvaldssource "arch/arm/mach-h720x/Kconfig" 2971da177e4SLinus Torvalds 2981da177e4SLinus Torvaldssource "arch/arm/mach-versatile/Kconfig" 2991da177e4SLinus Torvalds 300038c5b60SBellido Nicolassource "arch/arm/mach-aaec2000/Kconfig" 301038c5b60SBellido Nicolas 3028ad68bbfSCatalin Marinassource "arch/arm/mach-realview/Kconfig" 3038ad68bbfSCatalin Marinas 30473a59c1cSSAN Peoplesource "arch/arm/mach-at91rm9200/Kconfig" 30573a59c1cSSAN People 3061da177e4SLinus Torvalds# Definitions to make life easier 3071da177e4SLinus Torvaldsconfig ARCH_ACORN 3081da177e4SLinus Torvalds bool 3091da177e4SLinus Torvalds 3101da177e4SLinus Torvaldssource arch/arm/mm/Kconfig 3111da177e4SLinus Torvalds 3121da177e4SLinus Torvalds# bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER 3131da177e4SLinus Torvaldsconfig XSCALE_PMU 3141da177e4SLinus Torvalds bool 3151da177e4SLinus Torvalds depends on CPU_XSCALE && !XSCALE_PMU_TIMER 3161da177e4SLinus Torvalds default y 3171da177e4SLinus Torvalds 3181da177e4SLinus Torvaldsendmenu 3191da177e4SLinus Torvalds 3201da177e4SLinus Torvaldssource "arch/arm/common/Kconfig" 3211da177e4SLinus Torvalds 3221da177e4SLinus Torvaldsconfig FORCE_MAX_ZONEORDER 3231da177e4SLinus Torvalds int 3241da177e4SLinus Torvalds depends on SA1111 3251da177e4SLinus Torvalds default "9" 3261da177e4SLinus Torvalds 3271da177e4SLinus Torvaldsmenu "Bus support" 3281da177e4SLinus Torvalds 3291da177e4SLinus Torvaldsconfig ARM_AMBA 3301da177e4SLinus Torvalds bool 3311da177e4SLinus Torvalds 3321da177e4SLinus Torvaldsconfig ISA 3331da177e4SLinus Torvalds bool 3341da177e4SLinus Torvalds help 3351da177e4SLinus Torvalds Find out whether you have ISA slots on your motherboard. ISA is the 3361da177e4SLinus Torvalds name of a bus system, i.e. the way the CPU talks to the other stuff 3371da177e4SLinus Torvalds inside your box. Other bus systems are PCI, EISA, MicroChannel 3381da177e4SLinus Torvalds (MCA) or VESA. ISA is an older system, now being displaced by PCI; 3391da177e4SLinus Torvalds newer boards don't support it. If you have ISA, say Y, otherwise N. 3401da177e4SLinus Torvalds 341065909b9SRussell King# Select ISA DMA controller support 3421da177e4SLinus Torvaldsconfig ISA_DMA 3431da177e4SLinus Torvalds bool 344065909b9SRussell King select ISA_DMA_API 3451da177e4SLinus Torvalds 346065909b9SRussell King# Select ISA DMA interface 3475cae841bSAl Viroconfig ISA_DMA_API 3485cae841bSAl Viro bool 3495cae841bSAl Viro 3501da177e4SLinus Torvaldsconfig PCI 351c0da085aSCatalin Marinas bool "PCI support" if ARCH_INTEGRATOR_AP || ARCH_VERSATILE_PB 3521da177e4SLinus Torvalds help 3531da177e4SLinus Torvalds Find out whether you have a PCI motherboard. PCI is the name of a 3541da177e4SLinus Torvalds bus system, i.e. the way the CPU talks to the other stuff inside 3551da177e4SLinus Torvalds your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or 3561da177e4SLinus Torvalds VESA. If you have PCI, say Y, otherwise N. 3571da177e4SLinus Torvalds 3581da177e4SLinus Torvalds The PCI-HOWTO, available from 3591da177e4SLinus Torvalds <http://www.tldp.org/docs.html#howto>, contains valuable 3601da177e4SLinus Torvalds information about which PCI hardware does work under Linux and which 3611da177e4SLinus Torvalds doesn't. 3621da177e4SLinus Torvalds 3631da177e4SLinus Torvalds# Select the host bridge type 3641da177e4SLinus Torvaldsconfig PCI_HOST_VIA82C505 3651da177e4SLinus Torvalds bool 3661da177e4SLinus Torvalds depends on PCI && ARCH_SHARK 3671da177e4SLinus Torvalds default y 3681da177e4SLinus Torvalds 3691da177e4SLinus Torvaldssource "drivers/pci/Kconfig" 3701da177e4SLinus Torvalds 3711da177e4SLinus Torvaldssource "drivers/pcmcia/Kconfig" 3721da177e4SLinus Torvalds 3731da177e4SLinus Torvaldsendmenu 3741da177e4SLinus Torvalds 3751da177e4SLinus Torvaldsmenu "Kernel Features" 3761da177e4SLinus Torvalds 3771da177e4SLinus Torvaldsconfig SMP 3781da177e4SLinus Torvalds bool "Symmetric Multi-Processing (EXPERIMENTAL)" 379f6db449cSRussell King depends on EXPERIMENTAL && REALVIEW_MPCORE 3801da177e4SLinus Torvalds help 3811da177e4SLinus Torvalds This enables support for systems with more than one CPU. If you have 3821da177e4SLinus Torvalds a system with only one CPU, like most personal computers, say N. If 3831da177e4SLinus Torvalds you have a system with more than one CPU, say Y. 3841da177e4SLinus Torvalds 3851da177e4SLinus Torvalds If you say N here, the kernel will run on single and multiprocessor 3861da177e4SLinus Torvalds machines, but will use only one CPU of a multiprocessor machine. If 3871da177e4SLinus Torvalds you say Y here, the kernel will run on many, but not all, single 3881da177e4SLinus Torvalds processor machines. On a single processor machine, the kernel will 3891da177e4SLinus Torvalds run faster if you say N here. 3901da177e4SLinus Torvalds 39112c62c2eSArthur Othieno See also the <file:Documentation/smp.txt>, 39212c62c2eSArthur Othieno <file:Documentation/i386/IO-APIC.txt>, 3931da177e4SLinus Torvalds <file:Documentation/nmi_watchdog.txt> and the SMP-HOWTO available at 3941da177e4SLinus Torvalds <http://www.linuxdoc.org/docs.html#howto>. 3951da177e4SLinus Torvalds 3961da177e4SLinus Torvalds If you don't know what to do here, say N. 3971da177e4SLinus Torvalds 3981da177e4SLinus Torvaldsconfig NR_CPUS 3991da177e4SLinus Torvalds int "Maximum number of CPUs (2-32)" 4001da177e4SLinus Torvalds range 2 32 4011da177e4SLinus Torvalds depends on SMP 4021da177e4SLinus Torvalds default "4" 4031da177e4SLinus Torvalds 404a054a811SRussell Kingconfig HOTPLUG_CPU 405a054a811SRussell King bool "Support for hot-pluggable CPUs (EXPERIMENTAL)" 406a054a811SRussell King depends on SMP && HOTPLUG && EXPERIMENTAL 407a054a811SRussell King help 408a054a811SRussell King Say Y here to experiment with turning CPUs off and on. CPUs 409a054a811SRussell King can be controlled through /sys/devices/system/cpu. 410a054a811SRussell King 41137ee16aeSRussell Kingconfig LOCAL_TIMERS 41237ee16aeSRussell King bool "Use local timer interrupts" 4132a98beb6SRussell King depends on SMP && REALVIEW_MPCORE 41437ee16aeSRussell King default y 41537ee16aeSRussell King help 41637ee16aeSRussell King Enable support for local timers on SMP platforms, rather then the 41737ee16aeSRussell King legacy IPI broadcast method. Local timers allows the system 41837ee16aeSRussell King accounting to be spread across the timer interval, preventing a 41937ee16aeSRussell King "thundering herd" at every timer tick. 42037ee16aeSRussell King 4211da177e4SLinus Torvaldsconfig PREEMPT 4221da177e4SLinus Torvalds bool "Preemptible Kernel (EXPERIMENTAL)" 4231da177e4SLinus Torvalds depends on EXPERIMENTAL 4241da177e4SLinus Torvalds help 4251da177e4SLinus Torvalds This option reduces the latency of the kernel when reacting to 4261da177e4SLinus Torvalds real-time or interactive events by allowing a low priority process to 4271da177e4SLinus Torvalds be preempted even if it is in kernel mode executing a system call. 4281da177e4SLinus Torvalds This allows applications to run more reliably even when the system is 4291da177e4SLinus Torvalds under load. 4301da177e4SLinus Torvalds 4311da177e4SLinus Torvalds Say Y here if you are building a kernel for a desktop, embedded 4321da177e4SLinus Torvalds or real-time system. Say N if you are unsure. 4331da177e4SLinus Torvalds 4348749af68SRussell Kingconfig NO_IDLE_HZ 4358749af68SRussell King bool "Dynamic tick timer" 4368749af68SRussell King help 4378749af68SRussell King Select this option if you want to disable continuous timer ticks 4388749af68SRussell King and have them programmed to occur as required. This option saves 4398749af68SRussell King power as the system can remain in idle state for longer. 4408749af68SRussell King 4418749af68SRussell King By default dynamic tick is disabled during the boot, and can be 4428749af68SRussell King manually enabled with: 4438749af68SRussell King 4448749af68SRussell King echo 1 > /sys/devices/system/timer/timer0/dyn_tick 4458749af68SRussell King 4468749af68SRussell King Alternatively, if you want dynamic tick automatically enabled 4478749af68SRussell King during boot, pass "dyntick=enable" via the kernel command string. 4488749af68SRussell King 449f2be64b3STony Lindgren Please note that dynamic tick may affect the accuracy of 450f2be64b3STony Lindgren timekeeping on some platforms depending on the implementation. 451569d2c34SNicolas Pitre Currently at least OMAP, PXA2xx and SA11x0 platforms are known 452569d2c34SNicolas Pitre to have accurate timekeeping with dynamic tick. 453f2be64b3STony Lindgren 454f8065813SRussell Kingconfig HZ 455f8065813SRussell King int 456f8065813SRussell King default 128 if ARCH_L7200 457f8065813SRussell King default 200 if ARCH_EBSA110 || ARCH_S3C2410 458bfe65704SRussell King default OMAP_32K_TIMER_HZ if ARCH_OMAP && OMAP_32K_TIMER 459f8065813SRussell King default 100 460f8065813SRussell King 461704bdda0SNicolas Pitreconfig AEABI 462704bdda0SNicolas Pitre bool "Use the ARM EABI to compile the kernel" 463704bdda0SNicolas Pitre help 464704bdda0SNicolas Pitre This option allows for the kernel to be compiled using the latest 465704bdda0SNicolas Pitre ARM ABI (aka EABI). This is only useful if you are using a user 466704bdda0SNicolas Pitre space environment that is also compiled with EABI. 467704bdda0SNicolas Pitre 468704bdda0SNicolas Pitre Since there are major incompatibilities between the legacy ABI and 469704bdda0SNicolas Pitre EABI, especially with regard to structure member alignment, this 470704bdda0SNicolas Pitre option also changes the kernel syscall calling convention to 471704bdda0SNicolas Pitre disambiguate both ABIs and allow for backward compatibility support 472704bdda0SNicolas Pitre (selected with CONFIG_OABI_COMPAT). 473704bdda0SNicolas Pitre 474704bdda0SNicolas Pitre To use this you need GCC version 4.0.0 or later. 475704bdda0SNicolas Pitre 4766c90c872SNicolas Pitreconfig OABI_COMPAT 477a73a3ff1SRussell King bool "Allow old ABI binaries to run with this kernel (EXPERIMENTAL)" 47861c484d4SNicolas Pitre depends on AEABI && EXPERIMENTAL 4796c90c872SNicolas Pitre default y 4806c90c872SNicolas Pitre help 4816c90c872SNicolas Pitre This option preserves the old syscall interface along with the 4826c90c872SNicolas Pitre new (ARM EABI) one. It also provides a compatibility layer to 4836c90c872SNicolas Pitre intercept syscalls that have structure arguments which layout 4846c90c872SNicolas Pitre in memory differs between the legacy ABI and the new ARM EABI 4856c90c872SNicolas Pitre (only for non "thumb" binaries). This option adds a tiny 4866c90c872SNicolas Pitre overhead to all syscalls and produces a slightly larger kernel. 4876c90c872SNicolas Pitre If you know you'll be using only pure EABI user space then you 4886c90c872SNicolas Pitre can say N here. If this option is not selected and you attempt 4896c90c872SNicolas Pitre to execute a legacy ABI binary then the result will be 4906c90c872SNicolas Pitre UNPREDICTABLE (in fact it can be predicted that it won't work 4916c90c872SNicolas Pitre at all). If in doubt say Y. 4926c90c872SNicolas Pitre 4933f22ab27SDave Hansenconfig ARCH_DISCONTIGMEM_ENABLE 4941da177e4SLinus Torvalds bool 495f7e68bbfSRussell King default (ARCH_LH7A40X && !LH7A40X_CONTIGMEM) 4961da177e4SLinus Torvalds help 4971da177e4SLinus Torvalds Say Y to support efficient handling of discontiguous physical memory, 4981da177e4SLinus Torvalds for architectures which are either NUMA (Non-Uniform Memory Access) 4991da177e4SLinus Torvalds or have huge holes in the physical address space for other reasons. 5001da177e4SLinus Torvalds See <file:Documentation/vm/numa> for more. 5011da177e4SLinus Torvalds 5023f22ab27SDave Hansensource "mm/Kconfig" 5033f22ab27SDave Hansen 5041da177e4SLinus Torvaldsconfig LEDS 5051da177e4SLinus Torvalds bool "Timer and CPU usage LEDs" 5061da177e4SLinus Torvalds depends on ARCH_CDB89712 || ARCH_CO285 || ARCH_EBSA110 || \ 5071da177e4SLinus Torvalds ARCH_EBSA285 || ARCH_IMX || ARCH_INTEGRATOR || \ 5081da177e4SLinus Torvalds ARCH_LUBBOCK || MACH_MAINSTONE || ARCH_NETWINDER || \ 5091da177e4SLinus Torvalds ARCH_OMAP || ARCH_P720T || ARCH_PXA_IDP || \ 51073a59c1cSSAN People ARCH_SA1100 || ARCH_SHARK || ARCH_VERSATILE || \ 51173a59c1cSSAN People ARCH_AT91RM9200 5121da177e4SLinus Torvalds help 5131da177e4SLinus Torvalds If you say Y here, the LEDs on your machine will be used 5141da177e4SLinus Torvalds to provide useful information about your current system status. 5151da177e4SLinus Torvalds 5161da177e4SLinus Torvalds If you are compiling a kernel for a NetWinder or EBSA-285, you will 5171da177e4SLinus Torvalds be able to select which LEDs are active using the options below. If 5181da177e4SLinus Torvalds you are compiling a kernel for the EBSA-110 or the LART however, the 5191da177e4SLinus Torvalds red LED will simply flash regularly to indicate that the system is 5201da177e4SLinus Torvalds still functional. It is safe to say Y here if you have a CATS 5211da177e4SLinus Torvalds system, but the driver will do nothing. 5221da177e4SLinus Torvalds 5231da177e4SLinus Torvaldsconfig LEDS_TIMER 5241da177e4SLinus Torvalds bool "Timer LED" if (!ARCH_CDB89712 && !ARCH_OMAP) || \ 5251da177e4SLinus Torvalds MACH_OMAP_H2 || MACH_OMAP_PERSEUS2 5261da177e4SLinus Torvalds depends on LEDS 5271da177e4SLinus Torvalds default y if ARCH_EBSA110 5281da177e4SLinus Torvalds help 5291da177e4SLinus Torvalds If you say Y here, one of the system LEDs (the green one on the 5301da177e4SLinus Torvalds NetWinder, the amber one on the EBSA285, or the red one on the LART) 5311da177e4SLinus Torvalds will flash regularly to indicate that the system is still 5321da177e4SLinus Torvalds operational. This is mainly useful to kernel hackers who are 5331da177e4SLinus Torvalds debugging unstable kernels. 5341da177e4SLinus Torvalds 5351da177e4SLinus Torvalds The LART uses the same LED for both Timer LED and CPU usage LED 5361da177e4SLinus Torvalds functions. You may choose to use both, but the Timer LED function 5371da177e4SLinus Torvalds will overrule the CPU usage LED. 5381da177e4SLinus Torvalds 5391da177e4SLinus Torvaldsconfig LEDS_CPU 5401da177e4SLinus Torvalds bool "CPU usage LED" if (!ARCH_CDB89712 && !ARCH_EBSA110 && \ 5411da177e4SLinus Torvalds !ARCH_OMAP) || MACH_OMAP_H2 || MACH_OMAP_PERSEUS2 5421da177e4SLinus Torvalds depends on LEDS 5431da177e4SLinus Torvalds help 5441da177e4SLinus Torvalds If you say Y here, the red LED will be used to give a good real 5451da177e4SLinus Torvalds time indication of CPU usage, by lighting whenever the idle task 5461da177e4SLinus Torvalds is not currently executing. 5471da177e4SLinus Torvalds 5481da177e4SLinus Torvalds The LART uses the same LED for both Timer LED and CPU usage LED 5491da177e4SLinus Torvalds functions. You may choose to use both, but the Timer LED function 5501da177e4SLinus Torvalds will overrule the CPU usage LED. 5511da177e4SLinus Torvalds 5521da177e4SLinus Torvaldsconfig ALIGNMENT_TRAP 5531da177e4SLinus Torvalds bool 5541da177e4SLinus Torvalds default y if !ARCH_EBSA110 5551da177e4SLinus Torvalds help 5561da177e4SLinus Torvalds ARM processors can not fetch/store information which is not 5571da177e4SLinus Torvalds naturally aligned on the bus, i.e., a 4 byte fetch must start at an 5581da177e4SLinus Torvalds address divisible by 4. On 32-bit ARM processors, these non-aligned 5591da177e4SLinus Torvalds fetch/store instructions will be emulated in software if you say 5601da177e4SLinus Torvalds here, which has a severe performance impact. This is necessary for 5611da177e4SLinus Torvalds correct operation of some network protocols. With an IP-only 5621da177e4SLinus Torvalds configuration it is safe to say N, otherwise say Y. 5631da177e4SLinus Torvalds 5641da177e4SLinus Torvaldsendmenu 5651da177e4SLinus Torvalds 5661da177e4SLinus Torvaldsmenu "Boot options" 5671da177e4SLinus Torvalds 5681da177e4SLinus Torvalds# Compressed boot loader in ROM. Yes, we really want to ask about 5691da177e4SLinus Torvalds# TEXT and BSS so we preserve their values in the config files. 5701da177e4SLinus Torvaldsconfig ZBOOT_ROM_TEXT 5711da177e4SLinus Torvalds hex "Compressed ROM boot loader base address" 5721da177e4SLinus Torvalds default "0" 5731da177e4SLinus Torvalds help 5741da177e4SLinus Torvalds The physical address at which the ROM-able zImage is to be 5751da177e4SLinus Torvalds placed in the target. Platforms which normally make use of 5761da177e4SLinus Torvalds ROM-able zImage formats normally set this to a suitable 5771da177e4SLinus Torvalds value in their defconfig file. 5781da177e4SLinus Torvalds 5791da177e4SLinus Torvalds If ZBOOT_ROM is not enabled, this has no effect. 5801da177e4SLinus Torvalds 5811da177e4SLinus Torvaldsconfig ZBOOT_ROM_BSS 5821da177e4SLinus Torvalds hex "Compressed ROM boot loader BSS address" 5831da177e4SLinus Torvalds default "0" 5841da177e4SLinus Torvalds help 5851da177e4SLinus Torvalds The base address of 64KiB of read/write memory in the target 5861da177e4SLinus Torvalds for the ROM-able zImage, which must be available while the 5871da177e4SLinus Torvalds decompressor is running. Platforms which normally make use of 5881da177e4SLinus Torvalds ROM-able zImage formats normally set this to a suitable 5891da177e4SLinus Torvalds value in their defconfig file. 5901da177e4SLinus Torvalds 5911da177e4SLinus Torvalds If ZBOOT_ROM is not enabled, this has no effect. 5921da177e4SLinus Torvalds 5931da177e4SLinus Torvaldsconfig ZBOOT_ROM 5941da177e4SLinus Torvalds bool "Compressed boot loader in ROM/flash" 5951da177e4SLinus Torvalds depends on ZBOOT_ROM_TEXT != ZBOOT_ROM_BSS 5961da177e4SLinus Torvalds help 5971da177e4SLinus Torvalds Say Y here if you intend to execute your compressed kernel image 5981da177e4SLinus Torvalds (zImage) directly from ROM or flash. If unsure, say N. 5991da177e4SLinus Torvalds 6001da177e4SLinus Torvaldsconfig CMDLINE 6011da177e4SLinus Torvalds string "Default kernel command string" 6021da177e4SLinus Torvalds default "" 6031da177e4SLinus Torvalds help 6041da177e4SLinus Torvalds On some architectures (EBSA110 and CATS), there is currently no way 6051da177e4SLinus Torvalds for the boot loader to pass arguments to the kernel. For these 6061da177e4SLinus Torvalds architectures, you should supply some command-line options at build 6071da177e4SLinus Torvalds time by entering them here. As a minimum, you should specify the 6081da177e4SLinus Torvalds memory size and the root device (e.g., mem=64M root=/dev/nfs). 6091da177e4SLinus Torvalds 6101da177e4SLinus Torvaldsconfig XIP_KERNEL 6111da177e4SLinus Torvalds bool "Kernel Execute-In-Place from ROM" 6121da177e4SLinus Torvalds depends on !ZBOOT_ROM 6131da177e4SLinus Torvalds help 6141da177e4SLinus Torvalds Execute-In-Place allows the kernel to run from non-volatile storage 6151da177e4SLinus Torvalds directly addressable by the CPU, such as NOR flash. This saves RAM 6161da177e4SLinus Torvalds space since the text section of the kernel is not loaded from flash 6171da177e4SLinus Torvalds to RAM. Read-write sections, such as the data section and stack, 6181da177e4SLinus Torvalds are still copied to RAM. The XIP kernel is not compressed since 6191da177e4SLinus Torvalds it has to run directly from flash, so it will take more space to 6201da177e4SLinus Torvalds store it. The flash address used to link the kernel object files, 6211da177e4SLinus Torvalds and for storing it, is configuration dependent. Therefore, if you 6221da177e4SLinus Torvalds say Y here, you must know the proper physical address where to 6231da177e4SLinus Torvalds store the kernel image depending on your own flash memory usage. 6241da177e4SLinus Torvalds 6251da177e4SLinus Torvalds Also note that the make target becomes "make xipImage" rather than 6261da177e4SLinus Torvalds "make zImage" or "make Image". The final kernel binary to put in 6271da177e4SLinus Torvalds ROM memory will be arch/arm/boot/xipImage. 6281da177e4SLinus Torvalds 6291da177e4SLinus Torvalds If unsure, say N. 6301da177e4SLinus Torvalds 6311da177e4SLinus Torvaldsconfig XIP_PHYS_ADDR 6321da177e4SLinus Torvalds hex "XIP Kernel Physical Location" 6331da177e4SLinus Torvalds depends on XIP_KERNEL 6341da177e4SLinus Torvalds default "0x00080000" 6351da177e4SLinus Torvalds help 6361da177e4SLinus Torvalds This is the physical address in your flash memory the kernel will 6371da177e4SLinus Torvalds be linked for and stored to. This address is dependent on your 6381da177e4SLinus Torvalds own flash usage. 6391da177e4SLinus Torvalds 6401da177e4SLinus Torvaldsendmenu 6411da177e4SLinus Torvalds 642ec6bced6STony Lindgrenif (ARCH_SA1100 || ARCH_INTEGRATOR || ARCH_OMAP1) 6431da177e4SLinus Torvalds 6441da177e4SLinus Torvaldsmenu "CPU Frequency scaling" 6451da177e4SLinus Torvalds 6461da177e4SLinus Torvaldssource "drivers/cpufreq/Kconfig" 6471da177e4SLinus Torvalds 6481da177e4SLinus Torvaldsconfig CPU_FREQ_SA1100 6491da177e4SLinus Torvalds bool 65007c6d48fSVincent Sanders depends on CPU_FREQ && (SA1100_H3100 || SA1100_H3600 || SA1100_H3800 || SA1100_LART || SA1100_PLEB || SA1100_BADGE4 || SA1100_HACKKIT) 6511da177e4SLinus Torvalds default y 6521da177e4SLinus Torvalds 6531da177e4SLinus Torvaldsconfig CPU_FREQ_SA1110 6541da177e4SLinus Torvalds bool 6551da177e4SLinus Torvalds depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3) 6561da177e4SLinus Torvalds default y 6571da177e4SLinus Torvalds 6581da177e4SLinus Torvaldsconfig CPU_FREQ_INTEGRATOR 6591da177e4SLinus Torvalds tristate "CPUfreq driver for ARM Integrator CPUs" 6601da177e4SLinus Torvalds depends on ARCH_INTEGRATOR && CPU_FREQ 6611da177e4SLinus Torvalds default y 6621da177e4SLinus Torvalds help 6631da177e4SLinus Torvalds This enables the CPUfreq driver for ARM Integrator CPUs. 6641da177e4SLinus Torvalds 6651da177e4SLinus Torvalds For details, take a look at <file:Documentation/cpu-freq>. 6661da177e4SLinus Torvalds 6671da177e4SLinus Torvalds If in doubt, say Y. 6681da177e4SLinus Torvalds 6691da177e4SLinus Torvaldsendmenu 6701da177e4SLinus Torvalds 6711da177e4SLinus Torvaldsendif 6721da177e4SLinus Torvalds 6731da177e4SLinus Torvaldsmenu "Floating point emulation" 6741da177e4SLinus Torvalds 6751da177e4SLinus Torvaldscomment "At least one emulation must be selected" 6761da177e4SLinus Torvalds 6771da177e4SLinus Torvaldsconfig FPE_NWFPE 6781da177e4SLinus Torvalds bool "NWFPE math emulation" 6798993a44cSNicolas Pitre depends on !AEABI || OABI_COMPAT 6801da177e4SLinus Torvalds ---help--- 6811da177e4SLinus Torvalds Say Y to include the NWFPE floating point emulator in the kernel. 6821da177e4SLinus Torvalds This is necessary to run most binaries. Linux does not currently 6831da177e4SLinus Torvalds support floating point hardware so you need to say Y here even if 6841da177e4SLinus Torvalds your machine has an FPA or floating point co-processor podule. 6851da177e4SLinus Torvalds 6861da177e4SLinus Torvalds You may say N here if you are going to load the Acorn FPEmulator 6871da177e4SLinus Torvalds early in the bootup. 6881da177e4SLinus Torvalds 6891da177e4SLinus Torvaldsconfig FPE_NWFPE_XP 6901da177e4SLinus Torvalds bool "Support extended precision" 691bedf142bSLennert Buytenhek depends on FPE_NWFPE 6921da177e4SLinus Torvalds help 6931da177e4SLinus Torvalds Say Y to include 80-bit support in the kernel floating-point 6941da177e4SLinus Torvalds emulator. Otherwise, only 32 and 64-bit support is compiled in. 6951da177e4SLinus Torvalds Note that gcc does not generate 80-bit operations by default, 6961da177e4SLinus Torvalds so in most cases this option only enlarges the size of the 6971da177e4SLinus Torvalds floating point emulator without any good reason. 6981da177e4SLinus Torvalds 6991da177e4SLinus Torvalds You almost surely want to say N here. 7001da177e4SLinus Torvalds 7011da177e4SLinus Torvaldsconfig FPE_FASTFPE 7021da177e4SLinus Torvalds bool "FastFPE math emulation (EXPERIMENTAL)" 7038993a44cSNicolas Pitre depends on (!AEABI || OABI_COMPAT) && !CPU_32v3 && EXPERIMENTAL 7041da177e4SLinus Torvalds ---help--- 7051da177e4SLinus Torvalds Say Y here to include the FAST floating point emulator in the kernel. 7061da177e4SLinus Torvalds This is an experimental much faster emulator which now also has full 7071da177e4SLinus Torvalds precision for the mantissa. It does not support any exceptions. 7081da177e4SLinus Torvalds It is very simple, and approximately 3-6 times faster than NWFPE. 7091da177e4SLinus Torvalds 7101da177e4SLinus Torvalds It should be sufficient for most programs. It may be not suitable 7111da177e4SLinus Torvalds for scientific calculations, but you have to check this for yourself. 7121da177e4SLinus Torvalds If you do not feel you need a faster FP emulation you should better 7131da177e4SLinus Torvalds choose NWFPE. 7141da177e4SLinus Torvalds 7151da177e4SLinus Torvaldsconfig VFP 7161da177e4SLinus Torvalds bool "VFP-format floating point maths" 7171da177e4SLinus Torvalds depends on CPU_V6 || CPU_ARM926T 7181da177e4SLinus Torvalds help 7191da177e4SLinus Torvalds Say Y to include VFP support code in the kernel. This is needed 7201da177e4SLinus Torvalds if your hardware includes a VFP unit. 7211da177e4SLinus Torvalds 7221da177e4SLinus Torvalds Please see <file:Documentation/arm/VFP/release-notes.txt> for 7231da177e4SLinus Torvalds release notes and additional status information. 7241da177e4SLinus Torvalds 7251da177e4SLinus Torvalds Say N if your target does not have VFP hardware. 7261da177e4SLinus Torvalds 7271da177e4SLinus Torvaldsendmenu 7281da177e4SLinus Torvalds 7291da177e4SLinus Torvaldsmenu "Userspace binary formats" 7301da177e4SLinus Torvalds 7311da177e4SLinus Torvaldssource "fs/Kconfig.binfmt" 7321da177e4SLinus Torvalds 7331da177e4SLinus Torvaldsconfig ARTHUR 7341da177e4SLinus Torvalds tristate "RISC OS personality" 735704bdda0SNicolas Pitre depends on !AEABI 7361da177e4SLinus Torvalds help 7371da177e4SLinus Torvalds Say Y here to include the kernel code necessary if you want to run 7381da177e4SLinus Torvalds Acorn RISC OS/Arthur binaries under Linux. This code is still very 7391da177e4SLinus Torvalds experimental; if this sounds frightening, say N and sleep in peace. 7401da177e4SLinus Torvalds You can also say M here to compile this support as a module (which 7411da177e4SLinus Torvalds will be called arthur). 7421da177e4SLinus Torvalds 7431da177e4SLinus Torvaldsendmenu 7441da177e4SLinus Torvalds 7451da177e4SLinus Torvaldsmenu "Power management options" 7461da177e4SLinus Torvalds 747eceab4acSRussell Kingsource "kernel/power/Kconfig" 7481da177e4SLinus Torvalds 7491da177e4SLinus Torvaldsconfig APM 7501da177e4SLinus Torvalds tristate "Advanced Power Management Emulation" 7511da177e4SLinus Torvalds ---help--- 7521da177e4SLinus Torvalds APM is a BIOS specification for saving power using several different 7531da177e4SLinus Torvalds techniques. This is mostly useful for battery powered laptops with 7541da177e4SLinus Torvalds APM compliant BIOSes. If you say Y here, the system time will be 7551da177e4SLinus Torvalds reset after a RESUME operation, the /proc/apm device will provide 7561da177e4SLinus Torvalds battery status information, and user-space programs will receive 7571da177e4SLinus Torvalds notification of APM "events" (e.g. battery status change). 7581da177e4SLinus Torvalds 7591da177e4SLinus Torvalds In order to use APM, you will need supporting software. For location 7601da177e4SLinus Torvalds and more information, read <file:Documentation/pm.txt> and the 7611da177e4SLinus Torvalds Battery Powered Linux mini-HOWTO, available from 7621da177e4SLinus Torvalds <http://www.tldp.org/docs.html#howto>. 7631da177e4SLinus Torvalds 7641da177e4SLinus Torvalds This driver does not spin down disk drives (see the hdparm(8) 7651da177e4SLinus Torvalds manpage ("man 8 hdparm") for that), and it doesn't turn off 7661da177e4SLinus Torvalds VESA-compliant "green" monitors. 7671da177e4SLinus Torvalds 7681da177e4SLinus Torvalds Generally, if you don't have a battery in your machine, there isn't 7691da177e4SLinus Torvalds much point in using this driver and you should say N. If you get 7701da177e4SLinus Torvalds random kernel OOPSes or reboots that don't seem to be related to 7711da177e4SLinus Torvalds anything, try disabling/enabling this option (or disabling/enabling 7721da177e4SLinus Torvalds APM in your BIOS). 7731da177e4SLinus Torvalds 7741da177e4SLinus Torvaldsendmenu 7751da177e4SLinus Torvalds 776d5950b43SSam Ravnborgsource "net/Kconfig" 777d5950b43SSam Ravnborg 7781da177e4SLinus Torvaldsmenu "Device Drivers" 7791da177e4SLinus Torvalds 7801da177e4SLinus Torvaldssource "drivers/base/Kconfig" 7811da177e4SLinus Torvalds 782c35bf4a5SPavel Macheksource "drivers/connector/Kconfig" 783c35bf4a5SPavel Machek 7841da177e4SLinus Torvaldsif ALIGNMENT_TRAP 7851da177e4SLinus Torvaldssource "drivers/mtd/Kconfig" 7861da177e4SLinus Torvaldsendif 7871da177e4SLinus Torvalds 7881da177e4SLinus Torvaldssource "drivers/parport/Kconfig" 7891da177e4SLinus Torvalds 7901da177e4SLinus Torvaldssource "drivers/pnp/Kconfig" 7911da177e4SLinus Torvalds 7921da177e4SLinus Torvaldssource "drivers/block/Kconfig" 7931da177e4SLinus Torvalds 7941da177e4SLinus Torvaldssource "drivers/acorn/block/Kconfig" 7951da177e4SLinus Torvalds 796bb011b8eSDavid Brownellif PCMCIA || ARCH_CLPS7500 || ARCH_IOP3XX || ARCH_IXP4XX \ 797bb011b8eSDavid Brownell || ARCH_L7200 || ARCH_LH7A40X || ARCH_PXA || ARCH_RPC \ 798*c4713074SLennert Buytenhek || ARCH_S3C2410 || ARCH_SA1100 || ARCH_SHARK || FOOTBRIDGE \ 799*c4713074SLennert Buytenhek || ARCH_IXP23XX 8001da177e4SLinus Torvaldssource "drivers/ide/Kconfig" 8011da177e4SLinus Torvaldsendif 8021da177e4SLinus Torvalds 8031da177e4SLinus Torvaldssource "drivers/scsi/Kconfig" 8041da177e4SLinus Torvalds 8051da177e4SLinus Torvaldssource "drivers/md/Kconfig" 8061da177e4SLinus Torvalds 8071da177e4SLinus Torvaldssource "drivers/message/fusion/Kconfig" 8081da177e4SLinus Torvalds 8091da177e4SLinus Torvaldssource "drivers/ieee1394/Kconfig" 8101da177e4SLinus Torvalds 8111da177e4SLinus Torvaldssource "drivers/message/i2o/Kconfig" 8121da177e4SLinus Torvalds 813d5950b43SSam Ravnborgsource "drivers/net/Kconfig" 8141da177e4SLinus Torvalds 8151da177e4SLinus Torvaldssource "drivers/isdn/Kconfig" 8161da177e4SLinus Torvalds 8171da177e4SLinus Torvalds# input before char - char/joystick depends on it. As does USB. 8181da177e4SLinus Torvalds 8191da177e4SLinus Torvaldssource "drivers/input/Kconfig" 8201da177e4SLinus Torvalds 8211da177e4SLinus Torvaldssource "drivers/char/Kconfig" 8221da177e4SLinus Torvalds 8231da177e4SLinus Torvaldssource "drivers/i2c/Kconfig" 8241da177e4SLinus Torvalds 8258ae12a0dSDavid Brownellsource "drivers/spi/Kconfig" 8268ae12a0dSDavid Brownell 82704916c0eSAlessandro Zummosource "drivers/w1/Kconfig" 82804916c0eSAlessandro Zummo 829ad2f931dSJean Delvaresource "drivers/hwmon/Kconfig" 830ad2f931dSJean Delvare 8311da177e4SLinus Torvalds#source "drivers/l3/Kconfig" 8321da177e4SLinus Torvalds 8331da177e4SLinus Torvaldssource "drivers/misc/Kconfig" 8341da177e4SLinus Torvalds 835a4e137abSRussell Kingsource "drivers/mfd/Kconfig" 836a4e137abSRussell King 8371da177e4SLinus Torvaldssource "drivers/media/Kconfig" 8381da177e4SLinus Torvalds 8391da177e4SLinus Torvaldssource "drivers/video/Kconfig" 8401da177e4SLinus Torvalds 8411da177e4SLinus Torvaldssource "sound/Kconfig" 8421da177e4SLinus Torvalds 8431da177e4SLinus Torvaldssource "drivers/usb/Kconfig" 8441da177e4SLinus Torvalds 8451da177e4SLinus Torvaldssource "drivers/mmc/Kconfig" 8461da177e4SLinus Torvalds 8471da177e4SLinus Torvaldsendmenu 8481da177e4SLinus Torvalds 8491da177e4SLinus Torvaldssource "fs/Kconfig" 8501da177e4SLinus Torvalds 8511da177e4SLinus Torvaldssource "arch/arm/oprofile/Kconfig" 8521da177e4SLinus Torvalds 8531da177e4SLinus Torvaldssource "arch/arm/Kconfig.debug" 8541da177e4SLinus Torvalds 8551da177e4SLinus Torvaldssource "security/Kconfig" 8561da177e4SLinus Torvalds 8571da177e4SLinus Torvaldssource "crypto/Kconfig" 8581da177e4SLinus Torvalds 8591da177e4SLinus Torvaldssource "lib/Kconfig" 860