# For a description of the syntax of this configuration file,
# see Documentation/kbuild/kconfig-language.txt.
#
mainmenu "Linux/PowerPC Kernel Configuration"
source "arch/powerpc/platforms/Kconfig.cputype"
config PPC32
bool
default y if !PPC64
config 64BIT
bool
default y if PPC64
config PPC_MERGE
def_bool y
config MMU
bool
default y
config GENERIC_HARDIRQS
bool
default y
config IRQ_PER_CPU
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 y if 64BIT
config GENERIC_HWEIGHT
bool
default y
config GENERIC_CALIBRATE_DELAY
bool
default y
config GENERIC_FIND_NEXT_BIT
bool
default y
config ARCH_NO_VIRT_TO_BUS
def_bool PPC64
config PPC
bool
default y
config EARLY_PRINTK
bool
default y
config COMPAT
bool
default y if PPC64
config SYSVIPC_COMPAT
bool
depends on COMPAT && SYSVIPC
default y
# All PPC32s use generic nvram driver through ppc_md
config GENERIC_NVRAM
bool
default y if PPC32
config SCHED_NO_NO_OMIT_FRAME_POINTER
bool
default y
config ARCH_MAY_HAVE_PC_FDC
bool
default !PPC_PSERIES || PCI
config PPC_OF
def_bool y
config OF
def_bool y
config PPC_UDBG_16550
bool
default n
config GENERIC_TBSYNC
bool
default y if PPC32 && SMP
default n
config AUDIT_ARCH
bool
default y
config GENERIC_BUG
bool
default y
depends on BUG
config SYS_SUPPORTS_APM_EMULATION
default y if PMAC_APM_EMU
bool
config DEFAULT_UIMAGE
bool
help
Used to allow a board to specify it wants a uImage built by default
default n
config PPC64_SWSUSP
bool
depends on PPC64 && (BROKEN || (PPC_PMAC64 && EXPERIMENTAL))
default y
config PPC_DCR_NATIVE
bool
default n
config PPC_DCR_MMIO
bool
default n
config PPC_DCR
bool
depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
default y
config PPC_OF_PLATFORM_PCI
bool
depends on PPC64 # not supported on 32 bits yet
default n
source "init/Kconfig"
source "arch/powerpc/platforms/Kconfig"
menu "Kernel options"
config HIGHMEM
bool "High memory support"
depends on PPC32
source kernel/Kconfig.hz
source kernel/Kconfig.preempt
source "fs/Kconfig.binfmt"
# We optimistically allocate largepages from the VM, so make the limit
# large enough (16MB). This badly named config option is actually
# max order + 1
config FORCE_MAX_ZONEORDER
int
depends on PPC64
default "9" if PPC_64K_PAGES
default "13"
config MATH_EMULATION
bool "Math emulation"
depends on 4xx || 8xx || E200 || PPC_MPC832x || 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.
config IOMMU_VMERGE
bool "Enable IOMMU virtual merging"
depends on PPC64
default y
help
Cause IO segments sent to a device for DMA to be merged virtually
by the IOMMU when they happen to have been allocated contiguously.
This doesn't add pressure to the IOMMU allocator. However, some
drivers don't support getting large merged segments coming back
from *_map_sg().
Most drivers don't have this problem; it is safe to say Y here.
config HOTPLUG_CPU
bool "Support for enabling/disabling CPUs"
depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
---help---
Say Y here to be able to disable and re-enable individual
CPUs at runtime on SMP machines.
Say N if you are unsure.
config ARCH_ENABLE_MEMORY_HOTPLUG
def_bool y
config KEXEC
bool "kexec system call (EXPERIMENTAL)"
depends on (PPC_PRPMC2800 || PPC_MULTIPLATFORM) && 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.
config CRASH_DUMP
bool "Build a kdump crash kernel (EXPERIMENTAL)"
depends on PPC_MULTIPLATFORM && PPC64 && EXPERIMENTAL
help
Build a kernel suitable for use as a kdump capture kernel.
The kernel will be linked at a different address than normal, and
so can only be used for Kdump.
Don't change this unless you know what you are doing.
config PPCBUG_NVRAM
bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
default y if PPC_PREP
config IRQ_ALL_CPUS
bool "Distribute interrupts on all CPUs by default"
depends on SMP && !MV64360
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 NUMA
bool "NUMA support"
depends on PPC64
default y if SMP && PPC_PSERIES
config NODES_SHIFT
int
default "4"
depends on NEED_MULTIPLE_NODES
config ARCH_SELECT_MEMORY_MODEL
def_bool y
depends on PPC64
config ARCH_FLATMEM_ENABLE
def_bool y
depends on (PPC64 && !NUMA) || PPC32
config ARCH_SPARSEMEM_ENABLE
def_bool y
depends on PPC64
config ARCH_SPARSEMEM_DEFAULT
def_bool y
depends on (SMP && PPC_PSERIES) || PPC_PS3
config ARCH_POPULATES_NODE_MAP
def_bool y
source "mm/Kconfig"
config ARCH_MEMORY_PROBE
def_bool y
depends on MEMORY_HOTPLUG
# Some NUMA nodes have memory ranges that span
# other nodes. Even though a pfn is valid and
# between a node's start and end pfns, it may not
# reside on that node. See memmap_init_zone()
# for details.
config NODES_SPAN_OTHER_NODES
def_bool y
depends on NEED_MULTIPLE_NODES
config PPC_HAS_HASH_64K
bool
depends on PPC64
default n
config PPC_64K_PAGES
bool "64k page size"
depends on PPC64
select PPC_HAS_HASH_64K
help
This option changes the kernel logical page size to 64k. On machines
without processor support for 64k pages, the kernel will simulate
them by loading each individual 4k page on demand transparently,
while on hardware with such support, it will be used to map
normal application pages.
config SCHED_SMT
bool "SMT (Hyperthreading) scheduler support"
depends on PPC64 && SMP
help
SMT scheduler support improves the CPU scheduler's decision making
when dealing with POWER5 cpus at a cost of slightly increased
overhead in some places. If unsure say N here.
config PROC_DEVICETREE
bool "Support for device tree in /proc"
depends on PROC_FS
help
This option adds a device-tree directory under /proc which contains
an image of the device tree that the kernel copies from Open
Firmware or other boot firmware. If unsure, say Y here.
config CMDLINE_BOOL
bool "Default bootloader kernel arguments"
config CMDLINE
string "Initial kernel command string"
depends on CMDLINE_BOOL
default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
help
On some platforms, there is currently no way for the boot loader to
pass arguments to the kernel. For these platforms, you can supply
some command-line options at build time by entering them here. In
most cases you will need to specify the root device here.
if !44x || BROKEN
source kernel/power/Kconfig
endif
config SECCOMP
bool "Enable seccomp to safely compute untrusted bytecode"
depends on PROC_FS
default y
help
This kernel feature is useful for number crunching applications
that may need to compute untrusted bytecode during their
execution. By using pipes or other transports made available to
the process as file descriptors supporting the read/write
syscalls, it's possible to isolate those applications in
their own address space using seccomp. Once seccomp is
enabled via /proc/<pid>/seccomp, it cannot be disabled
and the task is only allowed to execute a few safe syscalls
defined by each seccomp mode.
If unsure, say Y. Only embedded should say N here.
config WANT_DEVICE_TREE
bool
default n
config DEVICE_TREE
string "Static device tree source file"
depends on WANT_DEVICE_TREE
help
This specifies the device tree source (.dts) file to be
compiled and included when building the bootwrapper. If a
relative filename is given, then it will be relative to
arch/powerpc/boot/dts. If you are not using the bootwrapper,
or do not need to build a dts into the bootwrapper, this
field is ignored.
For example, this is required when building a cuImage target
for an older U-Boot, which cannot pass a device tree itself.
Such a kernel will not work with a newer U-Boot that tries to
pass a device tree (unless you tell it not to). If your U-Boot
does not mention a device tree in "help bootm", then use the
cuImage target and specify a device tree here. Otherwise, use
the uImage target and leave this field blank.
endmenu
config ISA_DMA_API
bool
default y
menu "Bus options"
config ISA
bool "Support for ISA-bus hardware"
depends on PPC_PREP || PPC_CHRP
select PPC_I8259
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. If you have an Apple machine, say N here; if you
have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
you have an embedded board, consult your board documentation.
config ZONE_DMA
bool
default y
config GENERIC_ISA_DMA
bool
depends on PPC64 || POWER4 || 6xx && !CPM2
default y
config PPC_INDIRECT_PCI
bool
depends on PCI
default y if 40x || 44x
default n
config EISA
bool
config SBUS
bool
config FSL_SOC
bool
config FSL_PCI
bool
select PPC_INDIRECT_PCI
# Yes MCA RS/6000s exist but Linux-PPC does not currently support any
config MCA
bool
config PCI
bool "PCI support" if 40x || CPM2 || PPC_83xx || PPC_85xx || PPC_86xx \
|| PPC_MPC52xx || (EMBEDDED && (PPC_PSERIES || PPC_ISERIES)) \
|| PPC_PS3
default y if !40x && !CPM2 && !8xx && !PPC_83xx \
&& !PPC_85xx && !PPC_86xx
default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
default PCI_QSPAN if !4xx && !CPM2 && 8xx
select ARCH_SUPPORTS_MSI
help
Find out whether your system includes a PCI bus. PCI is the name of
a bus system, i.e. the way the CPU talks to the other stuff inside
your box. If you say Y here, the kernel will include drivers and
infrastructure code to support PCI bus devices.
config PCI_DOMAINS
def_bool PCI
config PCI_SYSCALL
def_bool PCI
config PCI_QSPAN
bool "QSpan PCI"
depends on !4xx && !CPM2 && 8xx
select PPC_I8259
help
Say Y here if you have a system based on a Motorola 8xx-series
embedded processor with a QSPAN PCI interface, otherwise say N.
config PCI_8260
bool
depends on PCI && 8260
select PPC_INDIRECT_PCI
default y
config 8260_PCI9
bool "Enable workaround for MPC826x erratum PCI 9"
depends on PCI_8260 && !ADS8272
default y
choice
prompt "IDMA channel for PCI 9 workaround"
depends on 8260_PCI9
config 8260_PCI9_IDMA1
bool "IDMA1"
config 8260_PCI9_IDMA2
bool "IDMA2"
config 8260_PCI9_IDMA3
bool "IDMA3"
config 8260_PCI9_IDMA4
bool "IDMA4"
endchoice
source "drivers/pci/pcie/Kconfig"
source "drivers/pci/Kconfig"
source "drivers/pcmcia/Kconfig"
source "drivers/pci/hotplug/Kconfig"
endmenu
menu "Advanced setup"
depends on PPC32
config ADVANCED_OPTIONS
bool "Prompt for advanced kernel configuration options"
help
This option will enable prompting for a variety of advanced kernel
configuration options. These options can cause the kernel to not
work if they are set incorrectly, but can be used to optimize certain
aspects of kernel memory management.
Unless you know what you are doing, say N here.
comment "Default settings for advanced configuration options are used"
depends on !ADVANCED_OPTIONS
config HIGHMEM_START_BOOL
bool "Set high memory pool address"
depends on ADVANCED_OPTIONS && HIGHMEM
help
This option allows you to set the base address of the kernel virtual
area used to map high memory pages. This can be useful in
optimizing the layout of kernel virtual memory.
Say N here unless you know what you are doing.
config HIGHMEM_START
hex "Virtual start address of high memory pool" if HIGHMEM_START_BOOL
default "0xfe000000"
config LOWMEM_SIZE_BOOL
bool "Set maximum low memory"
depends on ADVANCED_OPTIONS
help
This option allows you to set the maximum amount of memory which
will be used as "low memory", that is, memory which the kernel can
access directly, without having to set up a kernel virtual mapping.
This can be useful in optimizing the layout of kernel virtual
memory.
Say N here unless you know what you are doing.
config LOWMEM_SIZE
hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
default "0x30000000"
config KERNEL_START_BOOL
bool "Set custom kernel base address"
depends on ADVANCED_OPTIONS
help
This option allows you to set the kernel virtual address at which
the kernel will map low memory (the kernel image will be linked at
this address). This can be useful in optimizing the virtual memory
layout of the system.
Say N here unless you know what you are doing.
config KERNEL_START
hex "Virtual address of kernel base" if KERNEL_START_BOOL
default "0xc0000000"
config TASK_SIZE_BOOL
bool "Set custom user task size"
depends on ADVANCED_OPTIONS
help
This option allows you to set the amount of virtual address space
allocated to user tasks. This can be useful in optimizing the
virtual memory layout of the system.
Say N here unless you know what you are doing.
config TASK_SIZE
hex "Size of user task space" if TASK_SIZE_BOOL
default "0x80000000"
config CONSISTENT_START_BOOL
bool "Set custom consistent memory pool address"
depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
help
This option allows you to set the base virtual address
of the consistent memory pool. This pool of virtual
memory is used to make consistent memory allocations.
config CONSISTENT_START
hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
default "0xff100000" if NOT_COHERENT_CACHE
config CONSISTENT_SIZE_BOOL
bool "Set custom consistent memory pool size"
depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
help
This option allows you to set the size of the
consistent memory pool. This pool of virtual memory
is used to make consistent memory allocations.
config CONSISTENT_SIZE
hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
default "0x00200000" if NOT_COHERENT_CACHE
config BOOT_LOAD_BOOL
bool "Set the boot link/load address"
depends on ADVANCED_OPTIONS && !PPC_MULTIPLATFORM
help
This option allows you to set the initial load address of the zImage
or zImage.initrd file. This can be useful if you are on a board
which has a small amount of memory.
Say N here unless you know what you are doing.
config BOOT_LOAD
hex "Link/load address for booting" if BOOT_LOAD_BOOL
default "0x00400000" if 40x || 8xx || 8260
default "0x01000000" if 44x
default "0x00800000"
config PIN_TLB
bool "Pinned Kernel TLBs (860 ONLY)"
depends on ADVANCED_OPTIONS && 8xx
endmenu
if PPC64
config KERNEL_START
hex
default "0xc000000000000000"
endif
source "net/Kconfig"
source "drivers/Kconfig"
source "fs/Kconfig"
# XXX source "arch/ppc/8xx_io/Kconfig"
# XXX source "arch/ppc/8260_io/Kconfig"
source "arch/powerpc/sysdev/qe_lib/Kconfig"
source "lib/Kconfig"
menu "Instrumentation Support"
depends on EXPERIMENTAL
source "arch/powerpc/oprofile/Kconfig"
config KPROBES
bool "Kprobes"
depends on !BOOKE && !4xx && KALLSYMS && MODULES
help
Kprobes allows you to trap at almost any kernel address and
execute a callback function. register_kprobe() establishes
a probepoint and specifies the callback. Kprobes is useful
for kernel debugging, non-intrusive instrumentation and testing.
If in doubt, say "N".
endmenu
source "arch/powerpc/Kconfig.debug"
source "security/Kconfig"
config KEYS_COMPAT
bool
depends on COMPAT && KEYS
default y
source "crypto/Kconfig"
