191 lines
4.9 KiB
Plaintext
191 lines
4.9 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0
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config NIOS2
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def_bool y
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select ARCH_HAS_SYNC_DMA_FOR_CPU
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select ARCH_HAS_SYNC_DMA_FOR_DEVICE
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select ARCH_NO_SWAP
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select DMA_NONCOHERENT_OPS
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select TIMER_OF
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select GENERIC_ATOMIC64
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select GENERIC_CLOCKEVENTS
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select GENERIC_CPU_DEVICES
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select GENERIC_IRQ_PROBE
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select GENERIC_IRQ_SHOW
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select GENERIC_STRNCPY_FROM_USER
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select GENERIC_STRNLEN_USER
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select HAVE_ARCH_TRACEHOOK
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select HAVE_ARCH_KGDB
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select IRQ_DOMAIN
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select MODULES_USE_ELF_RELA
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select OF
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select OF_EARLY_FLATTREE
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select SOC_BUS
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select SPARSE_IRQ
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select USB_ARCH_HAS_HCD if USB_SUPPORT
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select CPU_NO_EFFICIENT_FFS
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config GENERIC_CSUM
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def_bool y
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config GENERIC_HWEIGHT
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def_bool y
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config GENERIC_CALIBRATE_DELAY
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def_bool y
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config NO_IOPORT_MAP
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def_bool y
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config HAS_DMA
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def_bool y
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config FPU
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def_bool n
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config RWSEM_GENERIC_SPINLOCK
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def_bool y
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config TRACE_IRQFLAGS_SUPPORT
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def_bool n
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menu "Kernel features"
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source "kernel/Kconfig.hz"
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config FORCE_MAX_ZONEORDER
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int "Maximum zone order"
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range 9 20
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default "11"
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help
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The kernel memory allocator divides physically contiguous memory
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blocks into "zones", where each zone is a power of two number of
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pages. This option selects the largest power of two that the kernel
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keeps in the memory allocator. If you need to allocate very large
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blocks of physically contiguous memory, then you may need to
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increase this value.
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This config option is actually maximum order plus one. For example,
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a value of 11 means that the largest free memory block is 2^10 pages.
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endmenu
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source "arch/nios2/platform/Kconfig.platform"
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menu "Processor type and features"
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config MMU
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def_bool y
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config NR_CPUS
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int
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default "1"
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config NIOS2_ALIGNMENT_TRAP
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bool "Catch alignment trap"
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default y
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help
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Nios II CPUs cannot fetch/store data which is not bus aligned,
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i.e., a 2 or 4 byte fetch must start at an address divisible by
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2 or 4. Any non-aligned load/store instructions will be trapped and
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emulated in software if you say Y here, which has a performance
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impact.
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comment "Boot options"
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config CMDLINE_BOOL
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bool "Default bootloader kernel arguments"
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default y
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config CMDLINE
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string "Default kernel command string"
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default ""
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depends on CMDLINE_BOOL
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help
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On some platforms, there is currently no way for the boot loader to
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pass arguments to the kernel. For these platforms, you can supply
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some command-line options at build time by entering them here. In
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other cases you can specify kernel args so that you don't have
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to set them up in board prom initialization routines.
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config CMDLINE_FORCE
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bool "Force default kernel command string"
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depends on CMDLINE_BOOL
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help
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Set this to have arguments from the default kernel command string
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override those passed by the boot loader.
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config NIOS2_CMDLINE_IGNORE_DTB
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bool "Ignore kernel command string from DTB"
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depends on CMDLINE_BOOL
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depends on !CMDLINE_FORCE
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default y
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help
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Set this to ignore the bootargs property from the devicetree's
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chosen node and fall back to CMDLINE if nothing is passed.
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config NIOS2_PASS_CMDLINE
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bool "Passed kernel command line from u-boot"
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default n
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help
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Use bootargs env variable from u-boot for kernel command line.
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will override "Default kernel command string".
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Say N if you are unsure.
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config NIOS2_BOOT_LINK_OFFSET
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hex "Link address offset for booting"
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default "0x00500000"
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help
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This option allows you to set the link address offset of the zImage.
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This can be useful if you are on a board which has a small amount of
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memory.
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endmenu
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menu "Advanced setup"
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config ADVANCED_OPTIONS
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bool "Prompt for advanced kernel configuration options"
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comment "Default settings for advanced configuration options are used"
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depends on !ADVANCED_OPTIONS
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config NIOS2_KERNEL_MMU_REGION_BASE_BOOL
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bool "Set custom kernel MMU region base address"
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depends on ADVANCED_OPTIONS
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help
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This option allows you to set the virtual address of the kernel MMU region.
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Say N here unless you know what you are doing.
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config NIOS2_KERNEL_MMU_REGION_BASE
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hex "Virtual base address of the kernel MMU region " if NIOS2_KERNEL_MMU_REGION_BASE_BOOL
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default "0x80000000"
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help
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This option allows you to set the virtual base address of the kernel MMU region.
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config NIOS2_KERNEL_REGION_BASE_BOOL
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bool "Set custom kernel region base address"
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depends on ADVANCED_OPTIONS
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help
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This option allows you to set the virtual address of the kernel region.
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Say N here unless you know what you are doing.
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config NIOS2_KERNEL_REGION_BASE
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hex "Virtual base address of the kernel region " if NIOS2_KERNEL_REGION_BASE_BOOL
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default "0xc0000000"
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config NIOS2_IO_REGION_BASE_BOOL
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bool "Set custom I/O region base address"
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depends on ADVANCED_OPTIONS
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help
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This option allows you to set the virtual address of the I/O region.
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Say N here unless you know what you are doing.
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config NIOS2_IO_REGION_BASE
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hex "Virtual base address of the I/O region" if NIOS2_IO_REGION_BASE_BOOL
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default "0xe0000000"
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endmenu
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