# # For a description of the syntax of this configuration file, # see Documentation/kbuild/kconfig-language.txt. # mainmenu "Linux Kernel Configuration" config ARM bool default y help The ARM series is a line of low-power-consumption RISC chip designs licensed by ARM ltd and targeted at embedded applications and handhelds such as the Compaq IPAQ. ARM-based PCs are no longer manufactured, but legacy ARM-based PC hardware remains popular in Europe. There is an ARM Linux project with a web page at . config MMU bool default y config EISA bool ---help--- The Extended Industry Standard Architecture (EISA) bus was developed as an open alternative to the IBM MicroChannel bus. The EISA bus provided some of the features of the IBM MicroChannel bus while maintaining backward compatibility with cards made for the older ISA bus. The EISA bus saw limited use between 1988 and 1995 when it was made obsolete by the PCI bus. Say Y here if you are building a kernel for an EISA-based machine. Otherwise, say N. config SBUS bool config MCA bool help MicroChannel Architecture is found in some IBM PS/2 machines and laptops. It is a bus system similar to PCI or ISA. See (and especially the web page given there) before attempting to build an MCA bus kernel. config UID16 bool default y config RWSEM_GENERIC_SPINLOCK bool default y config RWSEM_XCHGADD_ALGORITHM bool config GENERIC_BUST_SPINLOCK bool config GENERIC_ISA_DMA bool source "init/Kconfig" menu "System Type" choice prompt "ARM system type" default ARCH_RPC config ARCH_ADIFCC bool "ADIFCC-based" config ARCH_CLPS7500 bool "Cirrus-CL-PS7500FE" config ARCH_CLPS711X bool "CLPS711x/EP721x-based" config ARCH_CO285 bool "Co-EBSA285" config ARCH_PXA bool "PXA250/210-based" config ARCH_EBSA110 bool "EBSA-110" help This is an evaluation board for the StrongARM processor available from Digital. It has limited hardware on-board, including an onboard Ethernet interface, two PCMCIA sockets, two serial ports and a parallel port. config ARCH_CAMELOT bool "Epxa10db" help This enables support for Altera's Excalibur XA10 development board. If you would like to build your kernel to run on one of these boards then you must say 'Y' here. Otherwise say 'N' config ARCH_FOOTBRIDGE bool "FootBridge" config ARCH_INTEGRATOR bool "Integrator" config ARCH_IOP3XX bool "IOP3xx-based" config ARCH_L7200 bool "LinkUp-L7200" help Say Y here if you intend to run this kernel on a LinkUp Systems L7200 Software Development Board which uses an ARM720T processor. Information on this board can be obtained at: If you have any questions or comments about the Linux kernel port to this board, send e-mail to sjhill@cotw.com. config ARCH_RPC bool "RiscPC" help On the Acorn Risc-PC, Linux can support the internal IDE disk and CD-ROM interface, serial and parallel port, and the floppy drive. config ARCH_SA1100 bool "SA1100-based" config ARCH_SHARK bool "Shark" config ARCH_S3C2410 bool "Samsung S3C2410" help Samsung S3C2410X CPU based systems, such as the Simtec Electronics BAST (http://www.simtec.co.uk/products/EB110ITX/), the IPAQ 1940 or the Samsung SMDK2410 development board (and derviatives). config ARCH_OMAP bool "TI OMAP" config ARCH_LH7A40X bool "Sharp LH7A40X" help Say Y here for systems based on one of the Sharp LH7A40X System on a Chip processors. These CPUs include an ARM922T core with a wide array of integrated devices for hand-held and low-power applications. config ARCH_VERSATILE_PB bool "Versatile PB" help This enables support for ARM Ltd Versatile PB board. endchoice source "arch/arm/mach-clps711x/Kconfig" source "arch/arm/mach-epxa10db/Kconfig" source "arch/arm/mach-footbridge/Kconfig" source "arch/arm/mach-integrator/Kconfig" source "arch/arm/mach-iop3xx/Kconfig" source "arch/arm/mach-pxa/Kconfig" source "arch/arm/mach-sa1100/Kconfig" source "arch/arm/mach-omap/Kconfig" source "arch/arm/mach-s3c2410/Kconfig" source "arch/arm/mach-lh7a40x/Kconfig" # Definitions to make life easier config ARCH_ACORN bool depends on ARCH_RPC default y ##################################################################### # Footbridge support config FOOTBRIDGE bool depends on ARCH_CO285 || ARCH_FOOTBRIDGE default y config FOOTBRIDGE_HOST bool depends on ARCH_CATS || ARCH_EBSA285_HOST || ARCH_NETWINDER || ARCH_PERSONAL_SERVER default y config FOOTBRIDGE_ADDIN bool depends on ARCH_CO285 || ARCH_EBSA285_ADDIN default y config ARCH_EBSA285 bool depends on ARCH_EBSA285_HOST || ARCH_EBSA285_ADDIN default y ##################################################################### # SA1111 support config SA1111 bool depends on ASSABET_NEPONSET || SA1100_ADSBITSY || SA1100_BADGE4 || SA1100_CONSUS || SA1100_GRAPHICSMASTER || SA1100_JORNADA720 || ARCH_LUBBOCK || SA1100_PFS168 || SA1100_PT_SYSTEM3 || SA1100_XP860 default y config FORCE_MAX_ZONEORDER int depends on SA1111 default "9" config DMABOUNCE bool depends on SA1111 default y source arch/arm/mm/Kconfig # bool 'Use XScale PMU as timer source' CONFIG_XSCALE_PMU_TIMER config XSCALE_PMU bool depends on CPU_XSCALE && !XSCALE_PMU_TIMER default y endmenu menu "General setup" # Select various configuration options depending on the machine type config DISCONTIGMEM bool depends on ARCH_EDB7211 || ARCH_SA1100 || ARCH_LH7A40X default y help Say Y to upport efficient handling of discontiguous physical memory, for architectures which are either NUMA (Non-Uniform Memory Access) or have huge holes in the physical address space for other reasons. See for more. # Now handle the bus types config PCI bool "PCI support" if ARCH_INTEGRATOR_AP default y if ARCH_FTVPCI || ARCH_SHARK || FOOTBRIDGE_HOST || ARCH_IOP3XX help Find out whether you have a PCI motherboard. PCI is the name of a bus system, i.e. the way the CPU talks to the other stuff inside your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or VESA. If you have PCI, say Y, otherwise N. The PCI-HOWTO, available from , contains valuable information about which PCI hardware does work under Linux and which doesn't. # Select the host bridge type config PCI_HOST_PLX90X0 bool depends on PCI && ARCH_FTVPCI default y config PCI_HOST_VIA82C505 bool depends on PCI && ARCH_SHARK default y config ICST525 bool depends on ARCH_INTEGRATOR default y config ARM_AMBA bool depends on ARCH_INTEGRATOR || ARCH_VERSATILE_PB default y config ISA bool depends on FOOTBRIDGE_HOST || ARCH_SHARK || ARCH_CLPS7500 || ARCH_EBSA110 || ARCH_CDB89712 || ARCH_EDB7211 || ARCH_SA1100 default y help Find out whether you have ISA slots on your motherboard. ISA is the name of a bus system, i.e. the way the CPU talks to the other stuff inside your box. Other bus systems are PCI, EISA, MicroChannel (MCA) or VESA. ISA is an older system, now being displaced by PCI; newer boards don't support it. If you have ISA, say Y, otherwise N. config ISA_DMA bool depends on FOOTBRIDGE_HOST || ARCH_SHARK default y config FIQ bool depends on ARCH_ACORN || ARCH_L7200 || ARCH_LH7A400 default y # Compressed boot loader in ROM. Yes, we really want to ask about # TEXT and BSS so we preserve their values in the config files. config ZBOOT_ROM bool "Compressed boot loader in ROM/flash" help Say Y here if you intend to execute your compressed kernel image (zImage) directly from ROM or flash. If unsure, say N. config ZBOOT_ROM_TEXT hex "Compressed ROM boot loader base address" default "0" help The base address for zImage. Unless you have special requirements, you should not change this value. config ZBOOT_ROM_BSS hex "Compressed ROM boot loader BSS address" default "0" help The base address of 64KiB of read/write memory, which must be available while the decompressor is running. Unless you have special requirements, you should not change this value. config CPU_FREQ bool "Support CPU clock change (EXPERIMENTAL)" depends on (ARCH_SA1100 || ARCH_INTEGRATOR) && EXPERIMENTAL help CPU clock scaling allows you to change the clock speed of the running CPU on the fly. This is a nice method to save battery power, because the lower the clock speed, the less power the CPU consumes. Note that this driver doesn't automatically change the CPU clock speed, you need some userland tools (which still have to be written) to implement the policy. If you don't understand what this is all about, it's safe to say 'N'. # CPUfreq on SA11x0 is special -- it _needs_ the userspace governor config CPU_FREQ_SA1100 bool depends on CPU_FREQ && SA1100_LART default y select CPU_FREQ_24_API if SYSCTL config CPU_FREQ_SA1110 bool depends on CPU_FREQ && (SA1100_ASSABET || SA1100_CERF || SA1100_PT_SYSTEM3) default y select CPU_FREQ_24_API if SYSCTL config CPU_FREQ_INTEGRATOR tristate "CPUfreq driver for ARM Integrator CPUs" depends on ARCH_INTEGRATOR && ICST525 && CPU_FREQ default y help This enables the CPUfreq driver for ARM Integrator CPUs. For details, take a look at linux/Documentation/cpu-freq. If in doubt, say Y. if (CPU_FREQ_INTEGRATOR) || (CPU_FREQ_SA1110) || (CPU_FREQ_SA1100) source "drivers/cpufreq/Kconfig" endif source "drivers/pci/Kconfig" source "drivers/pcmcia/Kconfig" comment "At least one math emulation must be selected" config FPE_NWFPE bool "NWFPE math emulation" ---help--- Say Y to include the NWFPE floating point emulator in the kernel. This is necessary to run most binaries. Linux does not currently support floating point hardware so you need to say Y here even if your machine has an FPA or floating point co-processor podule. You may say N here if you are going to load the Acorn FPEmulator early in the bootup. config FPE_NWFPE_XP bool "Support extended precision" depends on FPE_NWFPE help Say Y to include 80-bit support in the kernel floating-point emulator. Otherwise, only 32 and 64-bit support is compiled in. Note that gcc does not generate 80-bit operations by default, so in most cases this option only enlarges the size of the floating point emulator without any good reason. You almost surely want to say N here. config FPE_FASTFPE bool "FastFPE math emulation (EXPERIMENTAL)" depends on !CPU_32v3 && EXPERIMENTAL ---help--- Say Y here to include the FAST floating point emulator in the kernel. This is an experimental much faster emulator which now also has full precision for the mantissa. It does not support any exceptions. It is very simple, and approximately 3-6 times faster than NWFPE. It should be sufficient for most programs. It may be not suitable for scientific calculations, but you have to check this for yourself. If you do not feel you need a faster FP emulation you should better choose NWFPE. source "fs/Kconfig.binfmt" source "drivers/base/Kconfig" config PM bool "Power Management support" ---help--- "Power Management" means that parts of your computer are shut off or put into a power conserving "sleep" mode if they are not being used. There are two competing standards for doing this: APM and ACPI. If you want to use either one, say Y here and then also to the requisite support below. Power Management is most important for battery powered laptop computers; if you have a laptop, check out the Linux Laptop home page on the WWW at or Tuxmobil - Linux on Mobile Computers at and the Battery Powered Linux mini-HOWTO, available from . Note that, even if you say N here, Linux on the x86 architecture will issue the hlt instruction if nothing is to be done, thereby sending the processor to sleep and saving power. config PREEMPT bool "Preemptible Kernel (EXPERIMENTAL)" depends on CPU_32 && EXPERIMENTAL help This option reduces the latency of the kernel when reacting to real-time or interactive events by allowing a low priority process to be preempted even if it is in kernel mode executing a system call. This allows applications to run more reliably even when the system is under load. Say Y here if you are building a kernel for a desktop, embedded or real-time system. Say N if you are unsure. config APM tristate "Advanced Power Management Emulation" depends on PM ---help--- APM is a BIOS specification for saving power using several different techniques. This is mostly useful for battery powered laptops with APM compliant BIOSes. If you say Y here, the system time will be reset after a RESUME operation, the /proc/apm device will provide battery status information, and user-space programs will receive notification of APM "events" (e.g. battery status change). If you select "Y" here, you can disable actual use of the APM BIOS by passing the "apm=off" option to the kernel at boot time. Note that the APM support is almost completely disabled for machines with more than one CPU. In order to use APM, you will need supporting software. For location and more information, read and the Battery Powered Linux mini-HOWTO, available from . This driver does not spin down disk drives (see the hdparm(8) manpage ("man 8 hdparm") for that), and it doesn't turn off VESA-compliant "green" monitors. This driver does not support the TI 4000M TravelMate and the ACER 486/DX4/75 because they don't have compliant BIOSes. Many "green" desktop machines also don't have compliant BIOSes, and this driver may cause those machines to panic during the boot phase. Generally, if you don't have a battery in your machine, there isn't much point in using this driver and you should say N. If you get random kernel OOPSes or reboots that don't seem to be related to anything, try disabling/enabling this option (or disabling/enabling APM in your BIOS). Some other things you should try when experiencing seemingly random, "weird" problems: 1) make sure that you have enough swap space and that it is enabled. 2) pass the "no-hlt" option to the kernel 3) switch on floating point emulation in the kernel and pass the "no387" option to the kernel 4) pass the "floppy=nodma" option to the kernel 5) pass the "mem=4M" option to the kernel (thereby disabling all but the first 4 MB of RAM) 6) make sure that the CPU is not over clocked. 7) read the sig11 FAQ at 8) disable the cache from your BIOS settings 9) install a fan for the video card or exchange video RAM 10) install a better fan for the CPU 11) exchange RAM chips 12) exchange the motherboard. To compile this driver as a module, choose M here: the module will be called apm. config ARTHUR tristate "RISC OS personality" depends on CPU_32 help Say Y here to include the kernel code necessary if you want to run Acorn RISC OS/Arthur binaries under Linux. This code is still very experimental; if this sounds frightening, say N and sleep in peace. You can also say M here to compile this support as a module (which will be called arthur). config CMDLINE string "Default kernel command string" default "" help On some architectures (EBSA110 and CATS), there is currently no way for the boot loader to pass arguments to the kernel. For these architectures, you should supply some command-line options at build time by entering them here. As a minimum, you should specify the memory size and the root device (e.g., mem=64M root=/dev/nfs). config LEDS bool "Timer and CPU usage LEDs" depends on ARCH_NETWINDER || ARCH_EBSA110 || ARCH_EBSA285 || ARCH_FTVPCI || ARCH_SHARK || ARCH_CO285 || ARCH_SA1100 || ARCH_LUBBOCK || ARCH_PXA_IDP || ARCH_INTEGRATOR || ARCH_CDB89712 || ARCH_P720T || ARCH_OMAP || ARCH_VERSATILE_PB help If you say Y here, the LEDs on your machine will be used to provide useful information about your current system status. If you are compiling a kernel for a NetWinder or EBSA-285, you will be able to select which LEDs are active using the options below. If you are compiling a kernel for the EBSA-110 or the LART however, the red LED will simply flash regularly to indicate that the system is still functional. It is safe to say Y here if you have a CATS system, but the driver will do nothing. config LEDS_TIMER bool "Timer LED" if LEDS && (ARCH_NETWINDER || ARCH_EBSA285 || ARCH_SHARK || ARCH_CO285 || ARCH_SA1100 || ARCH_LUBBOCK || ARCH_PXA_IDP || ARCH_INTEGRATOR || ARCH_P720T || ARCH_VERSATILE_PB) depends on ARCH_NETWINDER || ARCH_EBSA110 || ARCH_EBSA285 || ARCH_FTVPCI || ARCH_SHARK || ARCH_CO285 || ARCH_SA1100 || ARCH_LUBBOCK || ARCH_PXA_IDP || ARCH_INTEGRATOR || ARCH_CDB89712 || ARCH_P720T || ARCH_OMAP || ARCH_VERSATILE_PB default y if ARCH_EBSA110 help If you say Y here, one of the system LEDs (the green one on the NetWinder, the amber one on the EBSA285, or the red one on the LART) will flash regularly to indicate that the system is still operational. This is mainly useful to kernel hackers who are debugging unstable kernels. The LART uses the same LED for both Timer LED and CPU usage LED functions. You may choose to use both, but the Timer LED function will overrule the CPU usage LED. config LEDS_CPU bool "CPU usage LED" depends on LEDS && (ARCH_NETWINDER || ARCH_EBSA285 || ARCH_SHARK || ARCH_CO285 || ARCH_SA1100 || ARCH_LUBBOCK || ARCH_PXA_IDP || ARCH_INTEGRATOR || ARCH_P720T || ARCH_VERSATILE_PB) help If you say Y here, the red LED will be used to give a good real time indication of CPU usage, by lighting whenever the idle task is not currently executing. The LART uses the same LED for both Timer LED and CPU usage LED functions. You may choose to use both, but the Timer LED function will overrule the CPU usage LED. config ALIGNMENT_TRAP bool depends on CPU_32 default y help ARM processors can not fetch/store information which is not naturally aligned on the bus, i.e., a 4 byte fetch must start at an address divisible by 4. On 32-bit ARM processors, these non-aligned fetch/store instructions will be emulated in software if you say here, which has a severe performance impact. This is necessary for correct operation of some network protocols. With an IP-only configuration it is safe to say N, otherwise say Y. endmenu source "drivers/parport/Kconfig" if ALIGNMENT_TRAP source "drivers/mtd/Kconfig" endif source "drivers/pnp/Kconfig" source "drivers/block/Kconfig" source "drivers/md/Kconfig" source "drivers/acorn/block/Kconfig" source "net/Kconfig" source "drivers/ide/Kconfig" source "drivers/scsi/Kconfig" source "drivers/message/fusion/Kconfig" source "drivers/ieee1394/Kconfig" source "drivers/message/i2o/Kconfig" source "drivers/isdn/Kconfig" # # input before char - char/joystick depends on it. As does USB. # source "drivers/input/Kconfig" source "drivers/char/Kconfig" source "drivers/i2c/Kconfig" #source "drivers/l3/Kconfig" source "drivers/media/Kconfig" source "fs/Kconfig" source "arch/arm/oprofile/Kconfig" source "drivers/video/Kconfig" source "sound/Kconfig" source "drivers/misc/Kconfig" source "drivers/usb/Kconfig" menu "Kernel hacking" # RMK wants arm kernels compiled with frame pointers so hardwire this to y. # If you know what you are doing and are willing to live without stack # traces, you can get a slightly smaller kernel by setting this option to # n, but then RMK will have to kill you ;). config FRAME_POINTER bool default y help If you say N here, the resulting kernel will be slightly smaller and faster. However, when a problem occurs with the kernel, the information that is reported is severely limited. Most people should say Y here. config DEBUG_USER bool "Verbose user fault messages" help When a user program crashes due to an exception, the kernel can print a brief message explaining what the problem was. This is sometimes helpful for debugging but serves no purpose on a production system. Most people should say N here. In addition, you need to pass user_debug=N on the kernel command line to enable this feature. N consists of the sum of: 1 - undefined instruction events 2 - system calls 4 - invalid data aborts 8 - SIGSEGV faults 16 - SIGBUS faults config DEBUG_INFO bool "Include GDB debugging information in kernel binary" help Say Y here to include source-level debugging information in the `vmlinux' binary image. This is handy if you want to use gdb or addr2line to debug the kernel. It has no impact on the in-memory footprint of the running kernel but it can increase the amount of time and disk space needed for compilation of the kernel. If in doubt say N. config DEBUG_KERNEL bool "Kernel debugging" help Say Y here if you are developing drivers or trying to debug and identify kernel problems. config DEBUG_SLAB bool "Debug memory allocations" depends on DEBUG_KERNEL help Say Y here to have the kernel do limited verification on memory allocation as well as poisoning memory on free to catch use of freed memory. config MAGIC_SYSRQ bool "Magic SysRq key" depends on DEBUG_KERNEL help If you say Y here, you will have some control over the system even if the system crashes for example during kernel debugging (e.g., you will be able to flush the buffer cache to disk, reboot the system immediately or dump some status information). This is accomplished by pressing various keys while holding SysRq (Alt+PrintScreen). It also works on a serial console (on PC hardware at least), if you send a BREAK and then within 5 seconds a command keypress. The keys are documented in . Don't say Y unless you really know what this hack does. config DEBUG_SPINLOCK bool "Spinlock debugging" depends on DEBUG_KERNEL help Say Y here and build SMP to catch missing spinlock initialization and certain other kinds of spinlock errors commonly made. This is best used in conjunction with the NMI watchdog so that spinlock deadlocks are also debuggable. config DEBUG_WAITQ bool "Wait queue debugging" depends on DEBUG_KERNEL config DEBUG_BUGVERBOSE bool "Verbose BUG() reporting (adds 70K)" depends on DEBUG_KERNEL help Say Y here to make BUG() panics output the file name and line number of the BUG call as well as the EIP and oops trace. This aids debugging but costs about 70-100K of memory. config DEBUG_ERRORS bool "Verbose kernel error messages" depends on DEBUG_KERNEL help This option controls verbose debugging information which can be printed when the kernel detects an internal error. This debugging information is useful to kernel hackers when tracking down problems, but mostly meaningless to other people. It's safe to say Y unless you are concerned with the code size or don't want to see these messages. # These options are only for real kernel hackers who want to get their hands dirty. config DEBUG_LL bool "Kernel low-level debugging functions" depends on DEBUG_KERNEL help Say Y here to include definitions of printascii, printchar, printhex in the kernel. This is helpful if you are debugging code that executes before the console is initialized. config DEBUG_ICEDCC bool "Kernel low-level debugging via EmbeddedICE DCC channel" depends on DEBUG_LL help Say Y here if you want the debug print routines to direct their output to the EmbeddedICE macrocell's DCC channel using co-processor 14. This is known to work on the ARM9 style ICE channel. It does include a timeout to ensure that the system does not totally freeze when there is nothing connected to read. config DEBUG_DC21285_PORT bool "Kernel low-level debugging messages via footbridge serial port" depends on DEBUG_LL && FOOTBRIDGE help Say Y here if you want the debug print routines to direct their output to the serial port in the DC21285 (Footbridge). Saying N will cause the debug messages to appear on the first 16550 serial port. config DEBUG_CLPS711X_UART2 bool "Kernel low-level debugging messages via UART2" depends on DEBUG_LL && ARCH_CLPS711X help Say Y here if you want the debug print routines to direct their output to the second serial port on these devices. Saying N will cause the debug messages to appear on the first serial port. config DEBUG_S3C2410_PORT depends on DEBUG_LL && ARCH_S3C2410 bool "Kernel low-level debugging messages via S3C2410 UART" help Say Y here if you want debug print routines to go to one of the S3C2410 internal UARTs. The chosen UART must have been configured before it is used. config DEBUG_S3C2410_UART int depends on DEBUG_LL && ARCH_S3C2410 default "0" help Choice for UART for kernel low-level using S3C2410 UARTS, should be between zero and two. The port must have been initalised by the boot-loader before use. endmenu source "security/Kconfig" source "crypto/Kconfig" source "lib/Kconfig"