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Kconfig
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source "arch/powerpc/platforms/Kconfig.cputype"
config PPC32
bool
default y if !PPC64
config 32BIT
bool
default y if PPC32
config 64BIT
bool
default y if PPC64
config WORD_SIZE
int
default 64 if PPC64
default 32 if !PPC64
config ARCH_PHYS_ADDR_T_64BIT
def_bool PPC64 || PHYS_64BIT
config ARCH_DMA_ADDR_T_64BIT
def_bool ARCH_PHYS_ADDR_T_64BIT
config MMU
bool
default y
config HAVE_SETUP_PER_CPU_AREA
def_bool PPC64
config NEED_PER_CPU_EMBED_FIRST_CHUNK
def_bool PPC64
config NR_IRQS
int "Number of virtual interrupt numbers"
range 32 32768
default "512"
help
This defines the number of virtual interrupt numbers the kernel
can manage. Virtual interrupt numbers are what you see in
/proc/interrupts. If you configure your system to have too few,
drivers will fail to load or worse - handle with care.
config STACKTRACE_SUPPORT
bool
default y
config HAVE_LATENCYTOP_SUPPORT
def_bool y
config TRACE_IRQFLAGS_SUPPORT
bool
default y
config LOCKDEP_SUPPORT
bool
default y
config RWSEM_GENERIC_SPINLOCK
bool
config RWSEM_XCHGADD_ALGORITHM
bool
default y
config GENERIC_LOCKBREAK
bool
default y
depends on SMP && PREEMPT
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 ARCH_HAS_DMA_SET_COHERENT_MASK
bool
config PPC
bool
default y
select ARCH_MIGHT_HAVE_PC_PARPORT
select ARCH_MIGHT_HAVE_PC_SERIO
select BINFMT_ELF
select ARCH_HAS_ELF_RANDOMIZE
select OF
select OF_EARLY_FLATTREE
select OF_RESERVED_MEM
select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_DYNAMIC_FTRACE
select HAVE_FUNCTION_TRACER
select HAVE_FUNCTION_GRAPH_TRACER
select SYSCTL_EXCEPTION_TRACE
select ARCH_WANT_OPTIONAL_GPIOLIB
select VIRT_TO_BUS if !PPC64
select HAVE_IDE
select HAVE_IOREMAP_PROT
select HAVE_EFFICIENT_UNALIGNED_ACCESS if !CPU_LITTLE_ENDIAN
select HAVE_KPROBES
select HAVE_ARCH_KGDB
select HAVE_KRETPROBES
select HAVE_ARCH_TRACEHOOK
select HAVE_MEMBLOCK
select HAVE_MEMBLOCK_NODE_MAP
select HAVE_DMA_ATTRS
select HAVE_DMA_API_DEBUG
select HAVE_OPROFILE
select HAVE_DEBUG_KMEMLEAK
select ARCH_HAS_SG_CHAIN
select GENERIC_ATOMIC64 if PPC32
select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
select HAVE_PERF_EVENTS
select HAVE_REGS_AND_STACK_ACCESS_API
select HAVE_HW_BREAKPOINT if PERF_EVENTS && PPC_BOOK3S_64
select ARCH_WANT_IPC_PARSE_VERSION
select SPARSE_IRQ
select IRQ_DOMAIN
select GENERIC_IRQ_SHOW
select GENERIC_IRQ_SHOW_LEVEL
select IRQ_FORCED_THREADING
select HAVE_RCU_TABLE_FREE if SMP
select HAVE_SYSCALL_TRACEPOINTS
select HAVE_BPF_JIT
select HAVE_ARCH_JUMP_LABEL
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select ARCH_HAS_GCOV_PROFILE_ALL
select GENERIC_SMP_IDLE_THREAD
select GENERIC_CMOS_UPDATE
select GENERIC_TIME_VSYSCALL_OLD
select GENERIC_CLOCKEVENTS
select GENERIC_CLOCKEVENTS_BROADCAST if SMP
select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST
select GENERIC_STRNCPY_FROM_USER
select GENERIC_STRNLEN_USER
select HAVE_MOD_ARCH_SPECIFIC
select MODULES_USE_ELF_RELA
select CLONE_BACKWARDS
select ARCH_USE_BUILTIN_BSWAP
select OLD_SIGSUSPEND
select OLD_SIGACTION if PPC32
select HAVE_DEBUG_STACKOVERFLOW
select HAVE_IRQ_EXIT_ON_IRQ_STACK
select ARCH_USE_CMPXCHG_LOCKREF if PPC64
select HAVE_ARCH_AUDITSYSCALL
select ARCH_SUPPORTS_ATOMIC_RMW
select DCACHE_WORD_ACCESS if PPC64 && CPU_LITTLE_ENDIAN
select NO_BOOTMEM
select HAVE_GENERIC_RCU_GUP
select HAVE_PERF_EVENTS_NMI if PPC64
select EDAC_SUPPORT
select EDAC_ATOMIC_SCRUB
select ARCH_HAS_DMA_SET_COHERENT_MASK
select HAVE_ARCH_SECCOMP_FILTER
config GENERIC_CSUM
def_bool CPU_LITTLE_ENDIAN
config EARLY_PRINTK
bool
default y
config PANIC_TIMEOUT
int
default 180
config COMPAT
bool
default y if PPC64
select COMPAT_BINFMT_ELF
select ARCH_WANT_OLD_COMPAT_IPC
select COMPAT_OLD_SIGACTION
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_OMIT_FRAME_POINTER
bool
default y
config ARCH_MAY_HAVE_PC_FDC
bool
default PCI
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 EPAPR_BOOT
bool
help
Used to allow a board to specify it wants an ePAPR compliant wrapper.
default n
config DEFAULT_UIMAGE
bool
help
Used to allow a board to specify it wants a uImage built by default
default n
config ARCH_HIBERNATION_POSSIBLE
bool
default y
config ARCH_SUSPEND_POSSIBLE
def_bool y
depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx || \
(PPC_85xx && !PPC_E500MC) || PPC_86xx || PPC_PSERIES \
|| 44x || 40x
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 PCI
depends on PPC64 # not supported on 32 bits yet
default n
config ARCH_SUPPORTS_DEBUG_PAGEALLOC
depends on PPC32 || PPC_STD_MMU_64
def_bool y
config ARCH_SUPPORTS_UPROBES
def_bool y
config PPC_ADV_DEBUG_REGS
bool
depends on 40x || BOOKE
default y
config PPC_ADV_DEBUG_IACS
int
depends on PPC_ADV_DEBUG_REGS
default 4 if 44x
default 2
config PPC_ADV_DEBUG_DACS
int
depends on PPC_ADV_DEBUG_REGS
default 2
config PPC_ADV_DEBUG_DVCS
int
depends on PPC_ADV_DEBUG_REGS
default 2 if 44x
default 0
config PPC_ADV_DEBUG_DAC_RANGE
bool
depends on PPC_ADV_DEBUG_REGS && 44x
default y
config PPC_EMULATE_SSTEP
bool
default y if KPROBES || UPROBES || XMON || HAVE_HW_BREAKPOINT
config ZONE_DMA32
bool
default y if PPC64
config PGTABLE_LEVELS
int
default 2 if !PPC64
default 3 if PPC_64K_PAGES
default 4
source "init/Kconfig"
source "kernel/Kconfig.freezer"
source "arch/powerpc/sysdev/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"
config HUGETLB_PAGE_SIZE_VARIABLE
bool
depends on HUGETLB_PAGE
default y
config MATH_EMULATION
bool "Math emulation"
depends on 4xx || 8xx || PPC_MPC832x || BOOKE
---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.
This is also useful to emulate missing (optional) instructions
such as fsqrt on cores that do have an FPU but do not implement
them (such as Freescale BookE).
choice
prompt "Math emulation options"
default MATH_EMULATION_FULL
depends on MATH_EMULATION
config MATH_EMULATION_FULL
bool "Emulate all the floating point instructions"
---help---
Select this option will enable the kernel to support to emulate
all the floating point instructions. If your SoC doesn't have
a FPU, you should select this.
config MATH_EMULATION_HW_UNIMPLEMENTED
bool "Just emulate the FPU unimplemented instructions"
---help---
Select this if you know there does have a hardware FPU on your
SoC, but some floating point instructions are not implemented by that.
endchoice
config PPC_TRANSACTIONAL_MEM
bool "Transactional Memory support for POWERPC"
depends on PPC_BOOK3S_64
depends on SMP
select ALTIVEC
select VSX
default n
---help---
Support user-mode Transactional Memory on POWERPC.
config IOMMU_HELPER
def_bool PPC64
config SWIOTLB
bool "SWIOTLB support"
default n
select IOMMU_HELPER
---help---
Support for IO bounce buffering for systems without an IOMMU.
This allows us to DMA to the full physical address space on
platforms where the size of a physical address is larger
than the bus address. Not all platforms support this.
config HOTPLUG_CPU
bool "Support for enabling/disabling CPUs"
depends on SMP && (PPC_PSERIES || \
PPC_PMAC || PPC_POWERNV || (PPC_85xx && !PPC_E500MC))
---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_CPU_PROBE_RELEASE
def_bool y
depends on HOTPLUG_CPU
config ARCH_ENABLE_MEMORY_HOTPLUG
def_bool y
config ARCH_HAS_WALK_MEMORY
def_bool y
config ARCH_ENABLE_MEMORY_HOTREMOVE
def_bool y
config PPC64_SUPPORTS_MEMORY_FAILURE
bool "Add support for memory hwpoison"
depends on PPC_BOOK3S_64
default "y" if PPC_POWERNV
select ARCH_SUPPORTS_MEMORY_FAILURE
config KEXEC
bool "kexec system call"
depends on (PPC_BOOK3S || FSL_BOOKE || (44x && !SMP)) || PPC_BOOK3E
select KEXEC_CORE
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. 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"
depends on PPC64 || 6xx || FSL_BOOKE || (44x && !SMP)
select RELOCATABLE if (PPC64 && !COMPILE_TEST) || 44x || FSL_BOOKE
help
Build a kernel suitable for use as a kdump capture kernel.
The same kernel binary can be used as production kernel and dump
capture kernel.
config FA_DUMP
bool "Firmware-assisted dump"
depends on PPC64 && PPC_RTAS && CRASH_DUMP && KEXEC
help
A robust mechanism to get reliable kernel crash dump with
assistance from firmware. This approach does not use kexec,
instead firmware assists in booting the kdump kernel
while preserving memory contents. Firmware-assisted dump
is meant to be a kdump replacement offering robustness and
speed not possible without system firmware assistance.
If unsure, say "N"
config IRQ_ALL_CPUS
bool "Distribute interrupts on all CPUs by default"
depends on SMP
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 "8" if PPC64
default "4"
depends on NEED_MULTIPLE_NODES
config USE_PERCPU_NUMA_NODE_ID
def_bool y
depends on NUMA
config HAVE_MEMORYLESS_NODES
def_bool y
depends on NUMA
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
select SPARSEMEM_VMEMMAP_ENABLE
config ARCH_SPARSEMEM_DEFAULT
def_bool y
depends on (SMP && PPC_PSERIES) || PPC_PS3
config SYS_SUPPORTS_HUGETLBFS
bool
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 STDBINUTILS
bool "Using standard binutils settings"
depends on 44x
default y
help
Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
Note, that kernel will be able to run only those applications,
which had been compiled using binutils later than 2.17.50.0.3 with
'-zmax-page-size' set to 256K (the default is 64K). Or, if using
the older binutils, you can patch them with a trivial patch, which
changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
choice
prompt "Page size"
default PPC_4K_PAGES
help
Select the kernel logical page size. Increasing the page size
will reduce software overhead at each page boundary, allow
hardware prefetch mechanisms to be more effective, and allow
larger dma transfers increasing IO efficiency and reducing
overhead. However the utilization of memory will increase.
For example, each cached file will using a multiple of the
page size to hold its contents and the difference between the
end of file and the end of page is wasted.
Some dedicated systems, such as software raid serving with
accelerated calculations, have shown significant increases.
If you configure a 64 bit kernel for 64k pages but the
processor does not support them, then the kernel will simulate
them with 4k pages, loading them on demand, but with the
reduced software overhead and larger internal fragmentation.
For the 32 bit kernel, a large page option will not be offered
unless it is supported by the configured processor.
If unsure, choose 4K_PAGES.
config PPC_4K_PAGES
bool "4k page size"
select HAVE_ARCH_SOFT_DIRTY if CHECKPOINT_RESTORE && PPC_BOOK3S
config PPC_16K_PAGES
bool "16k page size"
depends on 44x || PPC_8xx
config PPC_64K_PAGES
bool "64k page size"
depends on !PPC_FSL_BOOK3E && (44x || PPC_STD_MMU_64 || PPC_BOOK3E_64)
select HAVE_ARCH_SOFT_DIRTY if CHECKPOINT_RESTORE && PPC_BOOK3S
config PPC_256K_PAGES
bool "256k page size"
depends on 44x && !STDBINUTILS
help
Make the page size 256k.
As the ELF standard only requires alignment to support page
sizes up to 64k, you will need to compile all of your user
space applications with a non-standard binutils settings
(see the STDBINUTILS description for details).
Say N unless you know what you are doing.
endchoice
config FORCE_MAX_ZONEORDER
int "Maximum zone order"
range 9 64 if PPC64 && PPC_64K_PAGES
default "9" if PPC64 && PPC_64K_PAGES
range 13 64 if PPC64 && !PPC_64K_PAGES
default "13" if PPC64 && !PPC_64K_PAGES
range 9 64 if PPC32 && PPC_16K_PAGES
default "9" if PPC32 && PPC_16K_PAGES
range 7 64 if PPC32 && PPC_64K_PAGES
default "7" if PPC32 && PPC_64K_PAGES
range 5 64 if PPC32 && PPC_256K_PAGES
default "5" if PPC32 && PPC_256K_PAGES
range 11 64
default "11"
help
The kernel memory allocator divides physically contiguous memory
blocks into "zones", where each zone is a power of two number of
pages. This option selects the largest power of two that the kernel
keeps in the memory allocator. If you need to allocate very large
blocks of physically contiguous memory, then you may need to
increase this value.
This config option is actually maximum order plus one. For example,
a value of 11 means that the largest free memory block is 2^10 pages.
The page size is not necessarily 4KB. For example, on 64-bit
systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
this in mind when choosing a value for this option.
config PPC_SUBPAGE_PROT
bool "Support setting protections for 4k subpages"
depends on PPC_STD_MMU_64 && PPC_64K_PAGES
help
This option adds support for a system call to allow user programs
to set access permissions (read/write, readonly, or no access)
on the 4k subpages of each 64k page.
config PPC_COPRO_BASE
bool
default n
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 PPC_DENORMALISATION
bool "PowerPC denormalisation exception handling"
depends on PPC_BOOK3S_64
default "y" if PPC_POWERNV
---help---
Add support for handling denormalisation of single precision
values. Useful for bare metal only. 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.
config CMDLINE_FORCE
bool "Always use the default kernel command string"
depends on CMDLINE_BOOL
help
Always use the default kernel command string, even if the boot
loader passes other arguments to the kernel.
This is useful if you cannot or don't want to change the
command-line options your boot loader passes to the kernel.
config EXTRA_TARGETS
string "Additional default image types"
help
List additional targets to be built by the bootwrapper here (separated
by spaces). This is useful for targets that depend of device tree
files in the .dts directory.
Targets in this list will be build as part of the default build
target, or when the user does a 'make zImage' or a
'make zImage.initrd'.
If unsure, leave blank
config ARCH_WANTS_FREEZER_CONTROL
def_bool y
depends on ADB_PMU
source kernel/power/Kconfig
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.
endmenu
config ISA_DMA_API
bool
default PCI
menu "Bus options"
config ISA
bool "Support for ISA-bus hardware"
depends on 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, say Y. If you have an
embedded board, consult your board documentation.
config ZONE_DMA
bool
default y
config NEED_DMA_MAP_STATE
def_bool (PPC64 || NOT_COHERENT_CACHE)
config NEED_SG_DMA_LENGTH
def_bool y
config GENERIC_ISA_DMA
bool
depends on ISA_DMA_API
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
select PCI_QUIRKS
config FSL_PMC
bool
default y
depends on SUSPEND && (PPC_85xx || PPC_86xx)
help
Freescale MPC85xx/MPC86xx power management controller support
(suspend/resume). For MPC83xx see platforms/83xx/suspend.c
config PPC4xx_CPM
bool
default y
depends on SUSPEND && (44x || 40x)
help
PPC4xx Clock Power Management (CPM) support (suspend/resume).
It also enables support for two different idle states (idle-wait
and idle-doze).
config 4xx_SOC
bool
config FSL_LBC
bool "Freescale Local Bus support"
depends on FSL_SOC
help
Enables reporting of errors from the Freescale local bus
controller. Also contains some common code used by
drivers for specific local bus peripherals.
config FSL_GTM
bool
depends on PPC_83xx || QUICC_ENGINE || CPM2
help
Freescale General-purpose Timers support
# Yes MCA RS/6000s exist but Linux-PPC does not currently support any
config MCA
bool
# Platforms that what PCI turned unconditionally just do select PCI
# in their config node. Platforms that want to choose at config
# time should select PPC_PCI_CHOICE
config PPC_PCI_CHOICE
bool
config PCI
bool "PCI support" if PPC_PCI_CHOICE
default y if !40x && !CPM2 && !8xx && !PPC_83xx \
&& !PPC_85xx && !PPC_86xx && !GAMECUBE_COMMON
default PCI_QSPAN if !4xx && !CPM2 && 8xx
select GENERIC_PCI_IOMAP
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
source "drivers/pci/pcie/Kconfig"
source "drivers/pci/Kconfig"
source "drivers/pcmcia/Kconfig"
source "drivers/pci/hotplug/Kconfig"
config HAS_RAPIDIO
bool
default n
config RAPIDIO
tristate "RapidIO support"
depends on HAS_RAPIDIO || PCI
help
If you say Y here, the kernel will include drivers and
infrastructure code to support RapidIO interconnect devices.
config FSL_RIO
bool "Freescale Embedded SRIO Controller support"
depends on RAPIDIO = y && HAS_RAPIDIO
default "n"
---help---
Include support for RapidIO controller on Freescale embedded
processors (MPC8548, MPC8641, etc).
source "drivers/rapidio/Kconfig"
endmenu
config NONSTATIC_KERNEL
bool
default n
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 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 LOWMEM_CAM_NUM_BOOL
bool "Set number of CAMs to use to map low memory"
depends on ADVANCED_OPTIONS && FSL_BOOKE
help
This option allows you to set the maximum number of CAM slots that
will be used to map low memory. There are a limited number of slots
available and even more limited number that will fit in the L1 MMU.
However, using more entries will allow mapping more low memory. This
can be useful in optimizing the layout of kernel virtual memory.
Say N here unless you know what you are doing.
config LOWMEM_CAM_NUM
depends on FSL_BOOKE
int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
default 3
config DYNAMIC_MEMSTART
bool "Enable page aligned dynamic load address for kernel"
depends on ADVANCED_OPTIONS && FLATMEM && (FSL_BOOKE || 44x)
select NONSTATIC_KERNEL
help
This option enables the kernel to be loaded at any page aligned
physical address. The kernel creates a mapping from KERNELBASE to
the address where the kernel is loaded. The page size here implies
the TLB page size of the mapping for kernel on the particular platform.
Please refer to the init code for finding the TLB page size.
DYNAMIC_MEMSTART is an easy way of implementing pseudo-RELOCATABLE
kernel image, where the only restriction is the page aligned kernel
load address. When this option is enabled, the compile time physical
address CONFIG_PHYSICAL_START is ignored.
This option is overridden by CONFIG_RELOCATABLE
config RELOCATABLE
bool "Build a relocatable kernel"
depends on ADVANCED_OPTIONS && FLATMEM && (44x || FSL_BOOKE)
select NONSTATIC_KERNEL
help
This builds a kernel image that is capable of running at the
location the kernel is loaded at, without any alignment restrictions.
This feature is a superset of DYNAMIC_MEMSTART and hence overrides it.
One use is for the kexec on panic case where the recovery kernel
must live at a different physical address than the primary
kernel.
Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
it has been loaded at and the compile time physical addresses
CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
setting can still be useful to bootwrappers that need to know the
load address of the kernel (eg. u-boot/mkimage).
config RELOCATABLE_PPC32
def_bool y
depends on PPC32 && RELOCATABLE
config PAGE_OFFSET_BOOL
bool "Set custom page offset address"
depends on ADVANCED_OPTIONS
help
This option allows you to set the kernel virtual address at which
the kernel will map low memory. This can be useful in optimizing
the virtual memory layout of the system.
Say N here unless you know what you are doing.
config PAGE_OFFSET
hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
default "0xc0000000"
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 be loaded. Normally this should match PAGE_OFFSET
however there are times (like kdump) that one might not want them
to be the same.
Say N here unless you know what you are doing.
config KERNEL_START
hex "Virtual address of kernel base" if KERNEL_START_BOOL
default PAGE_OFFSET if PAGE_OFFSET_BOOL
default "0xc2000000" if CRASH_DUMP && !NONSTATIC_KERNEL
default "0xc0000000"
config PHYSICAL_START_BOOL
bool "Set physical address where the kernel is loaded"
depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
help
This gives the physical address where the kernel is loaded.
Say N here unless you know what you are doing.
config PHYSICAL_START
hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
default "0x02000000" if PPC_STD_MMU && CRASH_DUMP && !NONSTATIC_KERNEL
default "0x00000000"