# SPDX-License-Identifier: GPL-2.0
|
config NIOS2
|
def_bool y
|
select ARCH_32BIT_OFF_T
|
select ARCH_HAS_DMA_PREP_COHERENT
|
select ARCH_HAS_SYNC_DMA_FOR_CPU
|
select ARCH_HAS_SYNC_DMA_FOR_DEVICE
|
select ARCH_HAS_DMA_SET_UNCACHED
|
select ARCH_NO_SWAP
|
select COMMON_CLK
|
select TIMER_OF
|
select GENERIC_ATOMIC64
|
select GENERIC_CLOCKEVENTS
|
select GENERIC_CPU_DEVICES
|
select GENERIC_IRQ_PROBE
|
select GENERIC_IRQ_SHOW
|
select GENERIC_STRNCPY_FROM_USER
|
select GENERIC_STRNLEN_USER
|
select HAVE_ARCH_TRACEHOOK
|
select HAVE_ARCH_KGDB
|
select IRQ_DOMAIN
|
select MODULES_USE_ELF_RELA
|
select OF
|
select OF_EARLY_FLATTREE
|
select SOC_BUS
|
select SPARSE_IRQ
|
select USB_ARCH_HAS_HCD if USB_SUPPORT
|
select CPU_NO_EFFICIENT_FFS
|
select MMU_GATHER_NO_RANGE if MMU
|
select SET_FS
|
|
config GENERIC_CSUM
|
def_bool y
|
|
config GENERIC_HWEIGHT
|
def_bool y
|
|
config GENERIC_CALIBRATE_DELAY
|
def_bool y
|
|
config NO_IOPORT_MAP
|
def_bool y
|
|
config FPU
|
def_bool n
|
|
config TRACE_IRQFLAGS_SUPPORT
|
def_bool n
|
|
menu "Kernel features"
|
|
source "kernel/Kconfig.hz"
|
|
config FORCE_MAX_ZONEORDER
|
int "Maximum zone order"
|
range 9 20
|
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.
|
|
endmenu
|
|
source "arch/nios2/platform/Kconfig.platform"
|
|
menu "Processor type and features"
|
|
config MMU
|
def_bool y
|
|
config NR_CPUS
|
int
|
default "1"
|
|
config NIOS2_ALIGNMENT_TRAP
|
bool "Catch alignment trap"
|
default y
|
help
|
Nios II CPUs cannot fetch/store data which is not bus aligned,
|
i.e., a 2 or 4 byte fetch must start at an address divisible by
|
2 or 4. Any non-aligned load/store instructions will be trapped and
|
emulated in software if you say Y here, which has a performance
|
impact.
|
|
comment "Boot options"
|
|
config CMDLINE_BOOL
|
bool "Default bootloader kernel arguments"
|
default y
|
|
config CMDLINE
|
string "Default kernel command string"
|
default ""
|
depends on CMDLINE_BOOL
|
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
|
other cases you can specify kernel args so that you don't have
|
to set them up in board prom initialization routines.
|
|
config CMDLINE_FORCE
|
bool "Force default kernel command string"
|
depends on CMDLINE_BOOL
|
help
|
Set this to have arguments from the default kernel command string
|
override those passed by the boot loader.
|
|
config NIOS2_CMDLINE_IGNORE_DTB
|
bool "Ignore kernel command string from DTB"
|
depends on CMDLINE_BOOL
|
depends on !CMDLINE_FORCE
|
default y
|
help
|
Set this to ignore the bootargs property from the devicetree's
|
chosen node and fall back to CMDLINE if nothing is passed.
|
|
config NIOS2_PASS_CMDLINE
|
bool "Passed kernel command line from u-boot"
|
help
|
Use bootargs env variable from u-boot for kernel command line.
|
will override "Default kernel command string".
|
Say N if you are unsure.
|
|
config NIOS2_BOOT_LINK_OFFSET
|
hex "Link address offset for booting"
|
default "0x00500000"
|
help
|
This option allows you to set the link address offset of the zImage.
|
This can be useful if you are on a board which has a small amount of
|
memory.
|
|
endmenu
|
|
menu "Advanced setup"
|
|
config ADVANCED_OPTIONS
|
bool "Prompt for advanced kernel configuration options"
|
|
comment "Default settings for advanced configuration options are used"
|
depends on !ADVANCED_OPTIONS
|
|
config NIOS2_KERNEL_MMU_REGION_BASE_BOOL
|
bool "Set custom kernel MMU region base address"
|
depends on ADVANCED_OPTIONS
|
help
|
This option allows you to set the virtual address of the kernel MMU region.
|
|
Say N here unless you know what you are doing.
|
|
config NIOS2_KERNEL_MMU_REGION_BASE
|
hex "Virtual base address of the kernel MMU region " if NIOS2_KERNEL_MMU_REGION_BASE_BOOL
|
default "0x80000000"
|
help
|
This option allows you to set the virtual base address of the kernel MMU region.
|
|
config NIOS2_KERNEL_REGION_BASE_BOOL
|
bool "Set custom kernel region base address"
|
depends on ADVANCED_OPTIONS
|
help
|
This option allows you to set the virtual address of the kernel region.
|
|
Say N here unless you know what you are doing.
|
|
config NIOS2_KERNEL_REGION_BASE
|
hex "Virtual base address of the kernel region " if NIOS2_KERNEL_REGION_BASE_BOOL
|
default "0xc0000000"
|
|
config NIOS2_IO_REGION_BASE_BOOL
|
bool "Set custom I/O region base address"
|
depends on ADVANCED_OPTIONS
|
help
|
This option allows you to set the virtual address of the I/O region.
|
|
Say N here unless you know what you are doing.
|
|
config NIOS2_IO_REGION_BASE
|
hex "Virtual base address of the I/O region" if NIOS2_IO_REGION_BASE_BOOL
|
default "0xe0000000"
|
|
endmenu
|
