1 # SPDX-License-Identifier: GPL-2.0
4 select ARCH_HAS_SYNC_DMA_FOR_CPU
5 select ARCH_HAS_SYNC_DMA_FOR_DEVICE
9 select GENERIC_ATOMIC64
10 select GENERIC_CLOCKEVENTS
11 select GENERIC_CPU_DEVICES
12 select GENERIC_IRQ_PROBE
13 select GENERIC_IRQ_SHOW
14 select GENERIC_STRNCPY_FROM_USER
15 select GENERIC_STRNLEN_USER
16 select HAVE_ARCH_TRACEHOOK
19 select MODULES_USE_ELF_RELA
21 select OF_EARLY_FLATTREE
24 select USB_ARCH_HAS_HCD if USB_SUPPORT
25 select CPU_NO_EFFICIENT_FFS
27 select ARCH_DISCARD_MEMBLOCK
32 config GENERIC_HWEIGHT
35 config GENERIC_CALIBRATE_DELAY
47 config RWSEM_GENERIC_SPINLOCK
50 config TRACE_IRQFLAGS_SUPPORT
53 menu "Kernel features"
55 source "kernel/Kconfig.hz"
57 config FORCE_MAX_ZONEORDER
58 int "Maximum zone order"
62 The kernel memory allocator divides physically contiguous memory
63 blocks into "zones", where each zone is a power of two number of
64 pages. This option selects the largest power of two that the kernel
65 keeps in the memory allocator. If you need to allocate very large
66 blocks of physically contiguous memory, then you may need to
69 This config option is actually maximum order plus one. For example,
70 a value of 11 means that the largest free memory block is 2^10 pages.
74 source "arch/nios2/platform/Kconfig.platform"
76 menu "Processor type and features"
85 config NIOS2_ALIGNMENT_TRAP
86 bool "Catch alignment trap"
89 Nios II CPUs cannot fetch/store data which is not bus aligned,
90 i.e., a 2 or 4 byte fetch must start at an address divisible by
91 2 or 4. Any non-aligned load/store instructions will be trapped and
92 emulated in software if you say Y here, which has a performance
95 comment "Boot options"
98 bool "Default bootloader kernel arguments"
102 string "Default kernel command string"
104 depends on CMDLINE_BOOL
106 On some platforms, there is currently no way for the boot loader to
107 pass arguments to the kernel. For these platforms, you can supply
108 some command-line options at build time by entering them here. In
109 other cases you can specify kernel args so that you don't have
110 to set them up in board prom initialization routines.
113 bool "Force default kernel command string"
114 depends on CMDLINE_BOOL
116 Set this to have arguments from the default kernel command string
117 override those passed by the boot loader.
119 config NIOS2_CMDLINE_IGNORE_DTB
120 bool "Ignore kernel command string from DTB"
121 depends on CMDLINE_BOOL
122 depends on !CMDLINE_FORCE
125 Set this to ignore the bootargs property from the devicetree's
126 chosen node and fall back to CMDLINE if nothing is passed.
128 config NIOS2_PASS_CMDLINE
129 bool "Passed kernel command line from u-boot"
132 Use bootargs env variable from u-boot for kernel command line.
133 will override "Default kernel command string".
134 Say N if you are unsure.
136 config NIOS2_BOOT_LINK_OFFSET
137 hex "Link address offset for booting"
140 This option allows you to set the link address offset of the zImage.
141 This can be useful if you are on a board which has a small amount of
146 menu "Advanced setup"
148 config ADVANCED_OPTIONS
149 bool "Prompt for advanced kernel configuration options"
151 comment "Default settings for advanced configuration options are used"
152 depends on !ADVANCED_OPTIONS
154 config NIOS2_KERNEL_MMU_REGION_BASE_BOOL
155 bool "Set custom kernel MMU region base address"
156 depends on ADVANCED_OPTIONS
158 This option allows you to set the virtual address of the kernel MMU region.
160 Say N here unless you know what you are doing.
162 config NIOS2_KERNEL_MMU_REGION_BASE
163 hex "Virtual base address of the kernel MMU region " if NIOS2_KERNEL_MMU_REGION_BASE_BOOL
166 This option allows you to set the virtual base address of the kernel MMU region.
168 config NIOS2_KERNEL_REGION_BASE_BOOL
169 bool "Set custom kernel region base address"
170 depends on ADVANCED_OPTIONS
172 This option allows you to set the virtual address of the kernel region.
174 Say N here unless you know what you are doing.
176 config NIOS2_KERNEL_REGION_BASE
177 hex "Virtual base address of the kernel region " if NIOS2_KERNEL_REGION_BASE_BOOL
180 config NIOS2_IO_REGION_BASE_BOOL
181 bool "Set custom I/O region base address"
182 depends on ADVANCED_OPTIONS
184 This option allows you to set the virtual address of the I/O region.
186 Say N here unless you know what you are doing.
188 config NIOS2_IO_REGION_BASE
189 hex "Virtual base address of the I/O region" if NIOS2_IO_REGION_BASE_BOOL