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# For a description of the syntax of this configuration file,
# see Documentation/kbuild/kconfig-language.txt.
#
mainmenu "Linux/PowerPC Kernel Configuration"
config MMU
bool
default y
config GENERIC_HARDIRQS
bool
default y
config RWSEM_GENERIC_SPINLOCK
bool
config RWSEM_XCHGADD_ALGORITHM
bool
default y
config ARCH_HAS_ILOG2_U32
bool
default y
config ARCH_HAS_ILOG2_U64
bool
default n
config GENERIC_HWEIGHT
bool
default y
config GENERIC_CALIBRATE_DELAY
bool
default y
config PPC
bool
default y
config PPC32
bool
default y
# All PPCs use generic nvram driver through ppc_md
config GENERIC_NVRAM
bool
default y
config GENERIC_FIND_NEXT_BIT
bool
default y
config SCHED_NO_NO_OMIT_FRAME_POINTER
bool
default y
config ARCH_MAY_HAVE_PC_FDC
bool
default y
config GENERIC_BUG
bool
default y
depends on BUG
source "init/Kconfig"
menu "Processor"
choice
prompt "Processor Type"
default 6xx
config 6xx
bool "6xx/7xx/74xx/52xx/82xx/83xx"
help
There are four types of PowerPC chips supported. The more common
types (601, 603, 604, 740, 750, 7400), the older Freescale
(formerly Motorola) embedded versions (821, 823, 850, 855, 860,
52xx, 82xx, 83xx), the IBM embedded versions (403 and 405) and
the Book E embedded processors from IBM (44x) and Freescale (85xx).
For support for 64-bit processors, set ARCH=powerpc.
Unless you are building a kernel for one of the embedded processor
systems, choose 6xx.
Also note that because the 52xx, 82xx, & 83xx family have a 603e
core, specific support for that chipset is asked later on.
config E200
bool "e200"
config PPC_FPU
bool
config PPC_DCR_NATIVE
bool
default n
config PPC_DCR
bool
depends on PPC_DCR_NATIVE
default y
depends on E200 || E500
depends on E200 || E500
depends on 44x || E500
default y if 44x
default y if E500 && PHYS_64BIT
bool 'Large physical address support' if E500
depends on 44x || E500
default y if 44x
---help---
This option enables kernel support for larger than 32-bit physical
addresses. This features is not be available on all e500 cores.
If in doubt, say N here.
depends on !8260 && !83xx
---help---
This option enables kernel support for the Altivec extensions to the
PowerPC processor. The kernel currently supports saving and restoring
altivec registers, and turning on the 'altivec enable' bit so user
processes can execute altivec instructions.
This option is only usefully if you have a processor that supports
altivec (G4, otherwise known as 74xx series), but does not have
any affect on a non-altivec cpu (it does, however add code to the
kernel).
If in doubt, say Y here.
config SPE
bool "SPE Support"
depends on E200 || E500
---help---
This option enables kernel support for the Signal Processing
Extensions (SPE) to the PowerPC processor. The kernel currently
supports saving and restoring SPE registers, and turning on the
'spe enable' bit so user processes can execute SPE instructions.
This option is only useful if you have a processor that supports
SPE (e500, otherwise known as 85xx series), but does not have any
effect on a non-spe cpu (it does, however add code to the kernel).
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If in doubt, say Y here.
config TAU
bool "Thermal Management Support"
depends on 6xx && !8260 && !83xx
help
G3 and G4 processors have an on-chip temperature sensor called the
'Thermal Assist Unit (TAU)', which, in theory, can measure the on-die
temperature within 2-4 degrees Celsius. This option shows the current
on-die temperature in /proc/cpuinfo if the cpu supports it.
Unfortunately, on some chip revisions, this sensor is very inaccurate
and in some cases, does not work at all, so don't assume the cpu
temp is actually what /proc/cpuinfo says it is.
config TAU_INT
bool "Interrupt driven TAU driver (DANGEROUS)"
depends on TAU
---help---
The TAU supports an interrupt driven mode which causes an interrupt
whenever the temperature goes out of range. This is the fastest way
to get notified the temp has exceeded a range. With this option off,
a timer is used to re-check the temperature periodically.
However, on some cpus it appears that the TAU interrupt hardware
is buggy and can cause a situation which would lead unexplained hard
lockups.
Unless you are extending the TAU driver, or enjoy kernel/hardware
debugging, leave this option off.
config TAU_AVERAGE
bool "Average high and low temp"
depends on TAU
---help---
The TAU hardware can compare the temperature to an upper and lower
bound. The default behavior is to show both the upper and lower
bound in /proc/cpuinfo. If the range is large, the temperature is
either changing a lot, or the TAU hardware is broken (likely on some
G4's). If the range is small (around 4 degrees), the temperature is
relatively stable. If you say Y here, a single temperature value,
halfway between the upper and lower bounds, will be reported in
/proc/cpuinfo.
If in doubt, say N here.
config MATH_EMULATION
bool "Math emulation"
depends on 4xx || 8xx || E200 || E500
---help---
Some PowerPC chips designed for embedded applications do not have
a floating-point unit and therefore do not implement the
floating-point instructions in the PowerPC instruction set. If you
say Y here, the kernel will include code to emulate a floating-point
unit, which will allow programs that use floating-point
instructions to run.
If you have an Apple machine or an IBM RS/6000 or pSeries machine,
or any machine with a 6xx, 7xx or 7xxx series processor, say N
here. Saying Y here will not hurt performance (on any machine) but
will increase the size of the kernel.
config KEXEC
bool "kexec system call (EXPERIMENTAL)"
depends on EXPERIMENTAL
help
kexec is a system call that implements the ability to shutdown your
current kernel, and to start another kernel. It is like a reboot
but it is independent of the system firmware. And like a reboot
you can start any kernel with it, not just Linux.
The name comes from the similarity to the exec system call.
It is an ongoing process to be certain the hardware in a machine
is properly shutdown, so do not be surprised if this code does not
initially work for you. It may help to enable device hotplugging
support. As of this writing the exact hardware interface is
strongly in flux, so no good recommendation can be made.
In the GameCube implementation, kexec allows you to load and
run DOL files, including kernel and homebrew DOLs.
source "drivers/cpufreq/Kconfig"
config PPC601_SYNC_FIX
bool "Workarounds for PPC601 bugs"
depends on 6xx && PPC_PREP
help
Some versions of the PPC601 (the first PowerPC chip) have bugs which
mean that extra synchronization instructions are required near
certain instructions, typically those that make major changes to the
CPU state. These extra instructions reduce performance slightly.
If you say N here, these extra instructions will not be included,
resulting in a kernel which will run faster but may not run at all
on some systems with the PPC601 chip.
If in doubt, say Y here.
source arch/ppc/platforms/4xx/Kconfig
source arch/ppc/platforms/85xx/Kconfig
config PPC_STD_MMU
bool
depends on 6xx
depends on 4xx || 8xx || E200
default y
endmenu
menu "Platform options"
config FADS
bool
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choice
prompt "8xx Machine Type"
depends on 8xx
default RPXLITE
config RPXLITE
bool "RPX-Lite"
---help---
Single-board computers based around the PowerPC MPC8xx chips and
intended for embedded applications. The following types are
supported:
RPX-Lite:
Embedded Planet RPX Lite. PC104 form-factor SBC based on the MPC823.
RPX-Classic:
Embedded Planet RPX Classic Low-fat. Credit-card-size SBC based on
the MPC 860
BSE-IP:
Bright Star Engineering ip-Engine.
TQM823L:
TQM850L:
TQM855L:
TQM860L:
MPC8xx based family of mini modules, half credit card size,
up to 64 MB of RAM, 8 MB Flash, (Fast) Ethernet, 2 x serial ports,
2 x CAN bus interface, ...
Manufacturer: TQ Components, www.tq-group.de
Date of Release: October (?) 1999
End of Life: not yet :-)
URL:
- module: <http://www.denx.de/PDF/TQM8xxLHWM201.pdf>
- starter kit: <http://www.denx.de/PDF/STK8xxLHWM201.pdf>
- images: <http://www.denx.de/embedded-ppc-en.html>
FPS850L:
FingerPrint Sensor System (based on TQM850L)
Manufacturer: IKENDI AG, <http://www.ikendi.com/>
Date of Release: November 1999
End of life: end 2000 ?
URL: see TQM850L
IVMS8:
MPC860 based board used in the "Integrated Voice Mail System",
Small Version (8 voice channels)
Manufacturer: Speech Design, <http://www.speech-design.de/>
Date of Release: December 2000 (?)
End of life: -
URL: <http://www.speech-design.de/>
IVML24:
MPC860 based board used in the "Integrated Voice Mail System",
Large Version (24 voice channels)
Manufacturer: Speech Design, <http://www.speech-design.de/>
Date of Release: March 2001 (?)
End of life: -
URL: <http://www.speech-design.de/>
HERMES:
Hermes-Pro ISDN/LAN router with integrated 8 x hub
Manufacturer: Multidata Gesellschaft fur Datentechnik und Informatik
<http://www.multidata.de/>
Date of Release: 2000 (?)
End of life: -
URL: <http://www.multidata.de/english/products/hpro.htm>
IP860:
VMEBus IP (Industry Pack) carrier board with MPC860
Manufacturer: MicroSys GmbH, <http://www.microsys.de/>
Date of Release: ?
End of life: -
URL: <http://www.microsys.de/html/ip860.html>
PCU_E:
PCU = Peripheral Controller Unit, Extended
Manufacturer: Siemens AG, ICN (Information and Communication Networks)
<http://www.siemens.de/page/1,3771,224315-1-999_2_226207-0,00.html>
Date of Release: April 2001
End of life: August 2001
URL: n. a.
config RPXCLASSIC
bool "RPX-Classic"
help
The RPX-Classic is a single-board computer based on the Motorola
MPC860. It features 16MB of DRAM and a variable amount of flash,
I2C EEPROM, thermal monitoring, a PCMCIA slot, a DIP switch and two
LEDs. Variants with Ethernet ports exist. Say Y here to support it
directly.
config BSEIP
bool "BSE-IP"
help
Say Y here to support the Bright Star Engineering ipEngine SBC.
This is a credit-card-sized device featuring a MPC823 processor,
26MB DRAM, 4MB flash, Ethernet, a 16K-gate FPGA, USB, an LCD/video
controller, and two RS232 ports.
config MPC8XXFADS
select FADS
config MPC86XADS
bool "MPC86XADS"
help
MPC86x Application Development System by Freescale Semiconductor.
The MPC86xADS is meant to serve as a platform for s/w and h/w
development around the MPC86X processor families.
select FADS
config MPC885ADS
bool "MPC885ADS"
help
Freescale Semiconductor MPC885 Application Development System (ADS).
Also known as DUET.
The MPC885ADS is meant to serve as a platform for s/w and h/w
development around the MPC885 processor family.
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config TQM823L
bool "TQM823L"
help
Say Y here to support the TQM823L, one of an MPC8xx-based family of
mini SBCs (half credit-card size) from TQ Components first released
in late 1999. Technical references are at
<http://www.denx.de/PDF/TQM8xxLHWM201.pdf>, and
<http://www.denx.de/PDF/STK8xxLHWM201.pdf>, and an image at
<http://www.denx.de/embedded-ppc-en.html>.
config TQM850L
bool "TQM850L"
help
Say Y here to support the TQM850L, one of an MPC8xx-based family of
mini SBCs (half credit-card size) from TQ Components first released
in late 1999. Technical references are at
<http://www.denx.de/PDF/TQM8xxLHWM201.pdf>, and
<http://www.denx.de/PDF/STK8xxLHWM201.pdf>, and an image at
<http://www.denx.de/embedded-ppc-en.html>.
config TQM855L
bool "TQM855L"
help
Say Y here to support the TQM855L, one of an MPC8xx-based family of
mini SBCs (half credit-card size) from TQ Components first released
in late 1999. Technical references are at
<http://www.denx.de/PDF/TQM8xxLHWM201.pdf>, and
<http://www.denx.de/PDF/STK8xxLHWM201.pdf>, and an image at
<http://www.denx.de/embedded-ppc-en.html>.
config TQM860L
bool "TQM860L"
help
Say Y here to support the TQM860L, one of an MPC8xx-based family of
mini SBCs (half credit-card size) from TQ Components first released
in late 1999. Technical references are at
<http://www.denx.de/PDF/TQM8xxLHWM201.pdf>, and
<http://www.denx.de/PDF/STK8xxLHWM201.pdf>, and an image at
<http://www.denx.de/embedded-ppc-en.html>.
config FPS850L
bool "FPS850L"
config IVMS8
bool "IVMS8"
help
Say Y here to support the Integrated Voice-Mail Small 8-channel SBC
from Speech Design, released March 2001. The manufacturer's website
is at <http://www.speech-design.de/>.
config IVML24
bool "IVML24"
help
Say Y here to support the Integrated Voice-Mail Large 24-channel SBC
from Speech Design, released March 2001. The manufacturer's website
is at <http://www.speech-design.de/>.
config HERMES_PRO
bool "HERMES"
config IP860
bool "IP860"
config LWMON
bool "LWMON"
config PCU_E
bool "PCU_E"
config CCM
bool "CCM"
config LANTEC
bool "LANTEC"
config MBX
bool "MBX"
help
MBX is a line of Motorola single-board computer based around the
MPC821 and MPC860 processors, and intended for embedded-controller
applications. Say Y here to support these boards directly.
config WINCEPT
bool "WinCept"
help
The Wincept 100/110 is a Motorola single-board computer based on the
MPC821 PowerPC, introduced in 1998 and designed to be used in
thin-client machines. Say Y to support it directly.
endchoice
Vitaly Bordug
committed
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menu "Freescale Ethernet driver platform-specific options"
depends on FS_ENET
config MPC8xx_SECOND_ETH
bool "Second Ethernet channel"
depends on (MPC885ADS || MPC86XADS)
default y
help
This enables support for second Ethernet on MPC885ADS and MPC86xADS boards.
The latter will use SCC1, for 885ADS you can select it below.
choice
prompt "Second Ethernet channel"
depends on MPC8xx_SECOND_ETH
default MPC8xx_SECOND_ETH_FEC2
config MPC8xx_SECOND_ETH_FEC2
bool "FEC2"
depends on MPC885ADS
help
Enable FEC2 to serve as 2-nd Ethernet channel. Note that SMC2
(often 2-nd UART) will not work if this is enabled.
config MPC8xx_SECOND_ETH_SCC1
bool "SCC1"
depends on MPC86XADS
select MPC8xx_SCC_ENET_FIXED
help
Enable SCC1 to serve as 2-nd Ethernet channel. Note that SMC1
(often 1-nd UART) will not work if this is enabled.
config MPC8xx_SECOND_ETH_SCC3
bool "SCC3"
depends on MPC885ADS
help
Enable SCC3 to serve as 2-nd Ethernet channel. Note that SMC1
(often 1-nd UART) will not work if this is enabled.
endchoice
config MPC8xx_SCC_ENET_FIXED
depends on MPC8xx_SECOND_ETH_SCC
default n
bool "Use fixed MII-less mode for SCC Ethernet"
endmenu
depends on 6xx
default PPC_PREP
---help---
Linux currently supports several different kinds of PowerPC-based
machines: Apple Power Macintoshes and clones (such as the Motorola
Starmax series), PReP (PowerPC Reference Platform) machines (such
as the Motorola PowerStacks, Motorola cPCI/VME embedded systems,
and some IBM RS/6000 systems), CHRP (Common Hardware Reference
Platform) machines (including all of the recent IBM RS/6000 and
pSeries machines), and several embedded PowerPC systems containing
4xx, 6xx, 7xx, 8xx, 74xx, and 82xx processors. Currently, the
default option is to build a kernel which works on PReP.
Note that support for Apple and CHRP machines is now only available
with ARCH=powerpc, and has been removed from this menu. If you
wish to build a kernel for an Apple or CHRP machine, exit this
configuration process and re-run it with ARCH=powerpc.
Select PReP if configuring for a PReP machine.
config PPC_PREP
bool "PReP"
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config KATANA
bool "Artesyn-Katana"
help
Select KATANA if configuring an Artesyn KATANA 750i or 3750
cPCI board.
config WILLOW
bool "Cogent-Willow"
config CPCI690
bool "Force-CPCI690"
help
Select CPCI690 if configuring a Force CPCI690 cPCI board.
config POWERPMC250
bool "Force-PowerPMC250"
config CHESTNUT
bool "IBM 750FX Eval board or 750GX Eval board"
help
Select CHESTNUT if configuring an IBM 750FX Eval Board or a
IBM 750GX Eval board.
config SPRUCE
bool "IBM-Spruce"
select PPC_INDIRECT_PCI
config HDPU
bool "Sky-HDPU"
help
Select HDPU if configuring a Sky Computers Compute Blade.
config HDPU_FEATURES
depends on HDPU
tristate "HDPU-Features"
help
Select to enable HDPU enhanced features.
config EV64260
bool "Marvell-EV64260BP"
help
Select EV64260 if configuring a Marvell (formerly Galileo)
EV64260BP Evaluation platform.
config LOPEC
bool "Motorola-LoPEC"
select PPC_INDIRECT_PCI
select PPC_INDIRECT_PCI
select PPC_INDIRECT_PCI
select PPC_INDIRECT_PCI
help
Select SANDPOINT if configuring for a Motorola Sandpoint X3
(any flavor).
config RADSTONE_PPC7D
bool "Radstone Technology PPC7D board"
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config PAL4
bool "SBS-Palomar4"
config EST8260
bool "EST8260"
---help---
The EST8260 is a single-board computer manufactured by Wind River
Systems, Inc. (formerly Embedded Support Tools Corp.) and based on
the MPC8260. Wind River Systems has a website at
<http://www.windriver.com/>, but the EST8260 cannot be found on it
and has probably been discontinued or rebadged.
config SBC82xx
bool "SBC82xx"
---help---
SBC PowerQUICC II, single-board computer with MPC82xx CPU
Manufacturer: Wind River Systems, Inc.
Date of Release: May 2003
End of Life: -
URL: <http://www.windriver.com/>
config SBS8260
bool "SBS8260"
config RPX8260
bool "RPXSUPER"
config TQM8260
bool "TQM8260"
---help---
MPC8260 based module, little larger than credit card,
up to 128 MB global + 64 MB local RAM, 32 MB Flash,
32 kB EEPROM, 256 kB L@ Cache, 10baseT + 100baseT Ethernet,
2 x serial ports, ...
Manufacturer: TQ Components, www.tq-group.de
Date of Release: June 2001
End of Life: not yet :-)
URL: <http://www.denx.de/PDF/TQM82xx_SPEC_Rev005.pdf>
config ADS8272
bool "ADS8272"
config PQ2FADS
bool "Freescale-PQ2FADS"
help
Select PQ2FADS if you wish to configure for a Freescale
PQ2FADS board (-VR or -ZU).
config LITE5200
bool "Freescale LITE5200 / (IceCube)"
select PPC_MPC52xx
help
Support for the LITE5200 dev board for the MPC5200 from Freescale.
This is for the LITE5200 version 2.0 board. Don't know if it changes
much but it's only been tested on this board version. I think this
board is also known as IceCube.
config LITE5200B
bool "Freescale LITE5200B"
depends on LITE5200
help
Support for the LITE5200B dev board for the MPC5200 from Freescale.
This is the new board with 2 PCI slots.
config MPC834x_SYS
bool "Freescale MPC834x SYS"
help
This option enables support for the MPC 834x SYS evaluation board.
Be aware that PCI buses can only function when SYS board is plugged
into the PIB (Platform IO Board) board from Freescale which provide
3 PCI slots. The PIBs PCI initialization is the bootloader's
config EV64360
bool "Marvell-EV64360BP"
help
Select EV64360 if configuring a Marvell EV64360BP Evaluation
platform.
endchoice
config PQ2ADS
bool
depends on ADS8272
default y
config TQM8xxL
bool
depends on 8xx && (TQM823L || TQM850L || FPS850L || TQM855L || TQM860L)
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default y
config EMBEDDEDBOOT
bool
depends on 8xx || 8260
default y
config PPC_MPC52xx
bool
config 8260
bool "CPM2 Support" if WILLOW
depends on 6xx
default y if TQM8260 || RPX8260 || EST8260 || SBS8260 || SBC82xx || PQ2FADS
help
The MPC8260 is a typical embedded CPU made by Motorola. Selecting
this option means that you wish to build a kernel for a machine with
an 8260 class CPU.
config 8272
bool
depends on 6xx
default y if ADS8272
select 8260
help
The MPC8272 CPM has a different internal dpram setup than other CPM2
devices
config 83xx
bool
default y if MPC834x_SYS
config MPC834x
bool
default y if MPC834x_SYS
config PPC_83xx
bool
default y if 83xx
config CPM1
bool
depends on 8xx
default y
help
The CPM1 (Communications Processor Module) is a coprocessor on
embedded CPUs made by Motorola. Selecting this option means that
you wish to build a kernel for a machine with a CPM1 coprocessor
on it (8xx, 827x, 8560).
config CPM2
bool
depends on 8260 || MPC8560 || MPC8555
default y
help
The CPM2 (Communications Processor Module) is a coprocessor on
embedded CPUs made by Motorola. Selecting this option means that
you wish to build a kernel for a machine with a CPM2 coprocessor
on it (826x, 827x, 8560).
config PPC_GEN550
bool
depends on SANDPOINT || SPRUCE || PPLUS || \
PRPMC750 || PRPMC800 || LOPEC || \
(EV64260 && !SERIAL_MPSC) || CHESTNUT || RADSTONE_PPC7D || \
83xx
default y
config FORCE
bool
depends on 6xx && POWERPMC250
default y
config GT64260
bool
depends on EV64260 || CPCI690
default y
config MV64360 # Really MV64360 & MV64460
bool
depends on CHESTNUT || KATANA || RADSTONE_PPC7D || HDPU || EV64360
default y
config MV64X60
bool
depends on (GT64260 || MV64360)
select PPC_INDIRECT_PCI
config MV643XX_ETH_0
bool
depends on MV643XX_ETH && (KATANA || RADSTONE_PPC7D || EV64360 || HDPU)
default y
config MV643XX_ETH_1
bool
depends on MV643XX_ETH && (KATANA || RADSTONE_PPC7D || EV64360)
default y
config MV643XX_ETH_2
bool
depends on MV643XX_ETH && (KATANA || RADSTONE_PPC7D || EV64360)
default y
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menu "Set bridge options"
depends on MV64X60
config NOT_COHERENT_CACHE
bool "Turn off Cache Coherency"
default n
help
Some 64x60 bridges lock up when trying to enforce cache coherency.
When this option is selected, cache coherency will be turned off.
Note that this can cause other problems (e.g., stale data being
speculatively loaded via a cached mapping). Use at your own risk.
config MV64X60_BASE
hex "Set bridge base used by firmware"
default "0xf1000000"
help
A firmware can leave the base address of the bridge's registers at
a non-standard location. If so, set this value to reflect the
address of that non-standard location.
config MV64X60_NEW_BASE
hex "Set bridge base used by kernel"
default "0xf1000000"
help
If the current base address of the bridge's registers is not where
you want it, set this value to the address that you want it moved to.
endmenu
config NONMONARCH_SUPPORT
bool "Enable Non-Monarch Support"
depends on PRPMC800
config HARRIER
bool
depends on PRPMC800
default y
config EPIC_SERIAL_MODE
bool
depends on 6xx && (LOPEC || SANDPOINT)
default y
config MPC10X_BRIDGE
bool
depends on POWERPMC250 || LOPEC || SANDPOINT
select PPC_INDIRECT_PCI
default y
config MPC10X_OPENPIC
bool
depends on POWERPMC250 || LOPEC || SANDPOINT
default y
config MPC10X_STORE_GATHERING
bool "Enable MPC10x store gathering"
depends on MPC10X_BRIDGE
config SANDPOINT_ENABLE_UART1
bool "Enable DUART mode on Sandpoint"
depends on SANDPOINT
help
If this option is enabled then the MPC824x processor will run
in DUART mode instead of UART mode.
config HARRIER_STORE_GATHERING
bool "Enable Harrier store gathering"
depends on HARRIER
config MVME5100_IPMC761_PRESENT
bool "MVME5100 configured with an IPMC761"
depends on MVME5100
config SPRUCE_BAUD_33M
bool "Spruce baud clock support"
depends on SPRUCE
config PC_KEYBOARD
bool "PC PS/2 style Keyboard"
depends on 4xx || CPM2
config PPCBUG_NVRAM
bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
default y if PPC_PREP
config SMP
bool "Symmetric multi-processing support"
---help---
This enables support for systems with more than one CPU. If you have
a system with only one CPU, say N. If you have a system with more
than one CPU, say Y. Note that the kernel does not currently
support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
since they have inadequate hardware support for multiprocessor
operation.
If you say N here, the kernel will run on single and multiprocessor
machines, but will use only one CPU of a multiprocessor machine. If
you say Y here, the kernel will run on single-processor machines.
On a single-processor machine, the kernel will run faster if you say
N here.
If you don't know what to do here, say N.
config IRQ_ALL_CPUS
bool "Distribute interrupts on all CPUs by default"
help
This option gives the kernel permission to distribute IRQs across
multiple CPUs. Saying N here will route all IRQs to the first
CPU. Generally saying Y is safe, although some problems have been
reported with SMP Power Macintoshes with this option enabled.
config NR_CPUS
int "Maximum number of CPUs (2-32)"
range 2 32
depends on SMP
default "4"
config HIGHMEM
bool "High memory support"
config ARCH_POPULATES_NODE_MAP
def_bool y
source kernel/Kconfig.hz
source kernel/Kconfig.preempt
source "fs/Kconfig.binfmt"
config PREP_RESIDUAL
bool "Support for PReP Residual Data"
depends on PPC_PREP
help
Some PReP systems have residual data passed to the kernel by the
firmware. This allows detection of memory size, devices present and
other useful pieces of information. Sometimes this information is
not present or incorrect, in which case it could lead to the machine
behaving incorrectly. If this happens, either disable PREP_RESIDUAL
or pass the 'noresidual' option to the kernel.
If you are running a PReP system, say Y here, otherwise say N.
config PROC_PREPRESIDUAL
bool "Support for reading of PReP Residual Data in /proc"
depends on PREP_RESIDUAL && PROC_FS
help
Enabling this option will create a /proc/residual file which allows
you to get at the residual data on PReP systems. You will need a tool
(lsresidual) to parse it. If you aren't on a PReP system, you don't
want this.