1 # SPDX-License-Identifier: GPL-2.0
4 select ARCH_32BIT_OFF_T
5 select ARCH_HAS_DMA_PREP_COHERENT
6 select ARCH_HAS_SYNC_DMA_FOR_CPU
7 select ARCH_HAS_SYNC_DMA_FOR_DEVICE
8 select ARCH_HAS_DMA_SET_UNCACHED
12 select GENERIC_ATOMIC64
13 select GENERIC_CLOCKEVENTS
14 select GENERIC_CPU_DEVICES
15 select GENERIC_IRQ_PROBE
16 select GENERIC_IRQ_SHOW
17 select GENERIC_STRNCPY_FROM_USER
18 select GENERIC_STRNLEN_USER
19 select HAVE_ARCH_TRACEHOOK
22 select MODULES_USE_ELF_RELA
24 select OF_EARLY_FLATTREE
27 select USB_ARCH_HAS_HCD if USB_SUPPORT
28 select CPU_NO_EFFICIENT_FFS
29 select MMU_GATHER_NO_RANGE if MMU
35 config GENERIC_HWEIGHT
38 config GENERIC_CALIBRATE_DELAY
47 config TRACE_IRQFLAGS_SUPPORT
50 menu "Kernel features"
52 source "kernel/Kconfig.hz"
54 config FORCE_MAX_ZONEORDER
55 int "Maximum zone order"
59 The kernel memory allocator divides physically contiguous memory
60 blocks into "zones", where each zone is a power of two number of
61 pages. This option selects the largest power of two that the kernel
62 keeps in the memory allocator. If you need to allocate very large
63 blocks of physically contiguous memory, then you may need to
66 This config option is actually maximum order plus one. For example,
67 a value of 11 means that the largest free memory block is 2^10 pages.
71 source "arch/nios2/platform/Kconfig.platform"
73 menu "Processor type and features"
82 config NIOS2_ALIGNMENT_TRAP
83 bool "Catch alignment trap"
86 Nios II CPUs cannot fetch/store data which is not bus aligned,
87 i.e., a 2 or 4 byte fetch must start at an address divisible by
88 2 or 4. Any non-aligned load/store instructions will be trapped and
89 emulated in software if you say Y here, which has a performance
92 comment "Boot options"
95 bool "Default bootloader kernel arguments"
99 string "Default kernel command string"
101 depends on CMDLINE_BOOL
103 On some platforms, there is currently no way for the boot loader to
104 pass arguments to the kernel. For these platforms, you can supply
105 some command-line options at build time by entering them here. In
106 other cases you can specify kernel args so that you don't have
107 to set them up in board prom initialization routines.
110 bool "Force default kernel command string"
111 depends on CMDLINE_BOOL
113 Set this to have arguments from the default kernel command string
114 override those passed by the boot loader.
116 config NIOS2_CMDLINE_IGNORE_DTB
117 bool "Ignore kernel command string from DTB"
118 depends on CMDLINE_BOOL
119 depends on !CMDLINE_FORCE
122 Set this to ignore the bootargs property from the devicetree's
123 chosen node and fall back to CMDLINE if nothing is passed.
125 config NIOS2_PASS_CMDLINE
126 bool "Passed kernel command line from u-boot"
128 Use bootargs env variable from u-boot for kernel command line.
129 will override "Default kernel command string".
130 Say N if you are unsure.
132 config NIOS2_BOOT_LINK_OFFSET
133 hex "Link address offset for booting"
136 This option allows you to set the link address offset of the zImage.
137 This can be useful if you are on a board which has a small amount of
142 menu "Advanced setup"
144 config ADVANCED_OPTIONS
145 bool "Prompt for advanced kernel configuration options"
147 comment "Default settings for advanced configuration options are used"
148 depends on !ADVANCED_OPTIONS
150 config NIOS2_KERNEL_MMU_REGION_BASE_BOOL
151 bool "Set custom kernel MMU region base address"
152 depends on ADVANCED_OPTIONS
154 This option allows you to set the virtual address of the kernel MMU region.
156 Say N here unless you know what you are doing.
158 config NIOS2_KERNEL_MMU_REGION_BASE
159 hex "Virtual base address of the kernel MMU region " if NIOS2_KERNEL_MMU_REGION_BASE_BOOL
162 This option allows you to set the virtual base address of the kernel MMU region.
164 config NIOS2_KERNEL_REGION_BASE_BOOL
165 bool "Set custom kernel region base address"
166 depends on ADVANCED_OPTIONS
168 This option allows you to set the virtual address of the kernel region.
170 Say N here unless you know what you are doing.
172 config NIOS2_KERNEL_REGION_BASE
173 hex "Virtual base address of the kernel region " if NIOS2_KERNEL_REGION_BASE_BOOL
176 config NIOS2_IO_REGION_BASE_BOOL
177 bool "Set custom I/O region base address"
178 depends on ADVANCED_OPTIONS
180 This option allows you to set the virtual address of the I/O region.
182 Say N here unless you know what you are doing.
184 config NIOS2_IO_REGION_BASE
185 hex "Virtual base address of the I/O region" if NIOS2_IO_REGION_BASE_BOOL