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1# SPDX-License-Identifier: GPL-2.0
2config NIOS2
3 def_bool y
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
9 select ARCH_NO_SWAP
10 select COMMON_CLK
11 select TIMER_OF
12 select GENERIC_ATOMIC64
13 select GENERIC_CPU_DEVICES
14 select GENERIC_IRQ_PROBE
15 select GENERIC_IRQ_SHOW
16 select HAVE_ARCH_TRACEHOOK
17 select HAVE_ARCH_KGDB
18 select IRQ_DOMAIN
19 select MODULES_USE_ELF_RELA
20 select OF
21 select OF_EARLY_FLATTREE
22 select SOC_BUS
23 select SPARSE_IRQ
24 select USB_ARCH_HAS_HCD if USB_SUPPORT
25 select CPU_NO_EFFICIENT_FFS
26 select MMU_GATHER_NO_RANGE if MMU
27
28config GENERIC_CSUM
29 def_bool y
30
31config GENERIC_HWEIGHT
32 def_bool y
33
34config GENERIC_CALIBRATE_DELAY
35 def_bool y
36
37config NO_IOPORT_MAP
38 def_bool y
39
40config FPU
41 def_bool n
42
43menu "Kernel features"
44
45source "kernel/Kconfig.hz"
46
47config ARCH_FORCE_MAX_ORDER
48 int "Maximum zone order"
49 range 9 20
50 default "11"
51 help
52 The kernel memory allocator divides physically contiguous memory
53 blocks into "zones", where each zone is a power of two number of
54 pages. This option selects the largest power of two that the kernel
55 keeps in the memory allocator. If you need to allocate very large
56 blocks of physically contiguous memory, then you may need to
57 increase this value.
58
59 This config option is actually maximum order plus one. For example,
60 a value of 11 means that the largest free memory block is 2^10 pages.
61
62endmenu
63
64source "arch/nios2/platform/Kconfig.platform"
65
66menu "Processor type and features"
67
68config MMU
69 def_bool y
70
71config NR_CPUS
72 int
73 default "1"
74
75config NIOS2_ALIGNMENT_TRAP
76 bool "Catch alignment trap"
77 default y
78 help
79 Nios II CPUs cannot fetch/store data which is not bus aligned,
80 i.e., a 2 or 4 byte fetch must start at an address divisible by
81 2 or 4. Any non-aligned load/store instructions will be trapped and
82 emulated in software if you say Y here, which has a performance
83 impact.
84
85comment "Boot options"
86
87config CMDLINE_BOOL
88 bool "Default bootloader kernel arguments"
89 default y
90
91config CMDLINE
92 string "Default kernel command string"
93 default ""
94 depends on CMDLINE_BOOL
95 help
96 On some platforms, there is currently no way for the boot loader to
97 pass arguments to the kernel. For these platforms, you can supply
98 some command-line options at build time by entering them here. In
99 other cases you can specify kernel args so that you don't have
100 to set them up in board prom initialization routines.
101
102config CMDLINE_FORCE
103 bool "Force default kernel command string"
104 depends on CMDLINE_BOOL
105 help
106 Set this to have arguments from the default kernel command string
107 override those passed by the boot loader.
108
109config NIOS2_CMDLINE_IGNORE_DTB
110 bool "Ignore kernel command string from DTB"
111 depends on CMDLINE_BOOL
112 depends on !CMDLINE_FORCE
113 default y
114 help
115 Set this to ignore the bootargs property from the devicetree's
116 chosen node and fall back to CMDLINE if nothing is passed.
117
118config NIOS2_PASS_CMDLINE
119 bool "Passed kernel command line from u-boot"
120 help
121 Use bootargs env variable from u-boot for kernel command line.
122 will override "Default kernel command string".
123 Say N if you are unsure.
124
125config NIOS2_BOOT_LINK_OFFSET
126 hex "Link address offset for booting"
127 default "0x00500000"
128 help
129 This option allows you to set the link address offset of the zImage.
130 This can be useful if you are on a board which has a small amount of
131 memory.
132
133endmenu
134
135menu "Advanced setup"
136
137config ADVANCED_OPTIONS
138 bool "Prompt for advanced kernel configuration options"
139
140comment "Default settings for advanced configuration options are used"
141 depends on !ADVANCED_OPTIONS
142
143config NIOS2_KERNEL_MMU_REGION_BASE_BOOL
144 bool "Set custom kernel MMU region base address"
145 depends on ADVANCED_OPTIONS
146 help
147 This option allows you to set the virtual address of the kernel MMU region.
148
149 Say N here unless you know what you are doing.
150
151config NIOS2_KERNEL_MMU_REGION_BASE
152 hex "Virtual base address of the kernel MMU region " if NIOS2_KERNEL_MMU_REGION_BASE_BOOL
153 default "0x80000000"
154 help
155 This option allows you to set the virtual base address of the kernel MMU region.
156
157config NIOS2_KERNEL_REGION_BASE_BOOL
158 bool "Set custom kernel region base address"
159 depends on ADVANCED_OPTIONS
160 help
161 This option allows you to set the virtual address of the kernel region.
162
163 Say N here unless you know what you are doing.
164
165config NIOS2_KERNEL_REGION_BASE
166 hex "Virtual base address of the kernel region " if NIOS2_KERNEL_REGION_BASE_BOOL
167 default "0xc0000000"
168
169config NIOS2_IO_REGION_BASE_BOOL
170 bool "Set custom I/O region base address"
171 depends on ADVANCED_OPTIONS
172 help
173 This option allows you to set the virtual address of the I/O region.
174
175 Say N here unless you know what you are doing.
176
177config NIOS2_IO_REGION_BASE
178 hex "Virtual base address of the I/O region" if NIOS2_IO_REGION_BASE_BOOL
179 default "0xe0000000"
180
181endmenu
1# SPDX-License-Identifier: GPL-2.0
2config NIOS2
3 def_bool y
4 select ARCH_32BIT_OFF_T
5 select ARCH_HAS_CPU_CACHE_ALIASING
6 select ARCH_HAS_DMA_PREP_COHERENT
7 select ARCH_HAS_SYNC_DMA_FOR_CPU
8 select ARCH_HAS_SYNC_DMA_FOR_DEVICE
9 select ARCH_HAS_DMA_SET_UNCACHED
10 select ARCH_NO_SWAP
11 select COMMON_CLK
12 select TIMER_OF
13 select GENERIC_ATOMIC64
14 select GENERIC_CPU_DEVICES
15 select GENERIC_IRQ_PROBE
16 select GENERIC_IRQ_SHOW
17 select HAVE_ARCH_TRACEHOOK
18 select HAVE_ARCH_KGDB
19 select HAVE_PAGE_SIZE_4KB
20 select IRQ_DOMAIN
21 select LOCK_MM_AND_FIND_VMA
22 select MODULES_USE_ELF_RELA
23 select OF
24 select OF_EARLY_FLATTREE
25 select SOC_BUS
26 select SPARSE_IRQ
27 select USB_ARCH_HAS_HCD if USB_SUPPORT
28 select CPU_NO_EFFICIENT_FFS
29 select MMU_GATHER_NO_RANGE if MMU
30
31config GENERIC_CSUM
32 def_bool y
33
34config GENERIC_HWEIGHT
35 def_bool y
36
37config GENERIC_CALIBRATE_DELAY
38 def_bool y
39
40config NO_IOPORT_MAP
41 def_bool y
42
43config FPU
44 def_bool n
45
46menu "Kernel features"
47
48source "kernel/Kconfig.hz"
49
50config ARCH_FORCE_MAX_ORDER
51 int "Order of maximal physically contiguous allocations"
52 default "10"
53 help
54 The kernel page allocator limits the size of maximal physically
55 contiguous allocations. The limit is called MAX_PAGE_ORDER and it
56 defines the maximal power of two of number of pages that can be
57 allocated as a single contiguous block. This option allows
58 overriding the default setting when ability to allocate very
59 large blocks of physically contiguous memory is required.
60
61 Don't change if unsure.
62
63endmenu
64
65source "arch/nios2/platform/Kconfig.platform"
66
67menu "Processor type and features"
68
69config MMU
70 def_bool y
71
72config NR_CPUS
73 int
74 default "1"
75
76config NIOS2_ALIGNMENT_TRAP
77 bool "Catch alignment trap"
78 default y
79 help
80 Nios II CPUs cannot fetch/store data which is not bus aligned,
81 i.e., a 2 or 4 byte fetch must start at an address divisible by
82 2 or 4. Any non-aligned load/store instructions will be trapped and
83 emulated in software if you say Y here, which has a performance
84 impact.
85
86comment "Boot options"
87
88config CMDLINE_BOOL
89 bool "Default bootloader kernel arguments"
90 default y
91
92config CMDLINE
93 string "Default kernel command string"
94 default ""
95 depends on CMDLINE_BOOL
96 help
97 On some platforms, there is currently no way for the boot loader to
98 pass arguments to the kernel. For these platforms, you can supply
99 some command-line options at build time by entering them here. In
100 other cases you can specify kernel args so that you don't have
101 to set them up in board prom initialization routines.
102
103config CMDLINE_FORCE
104 bool "Force default kernel command string"
105 depends on CMDLINE_BOOL
106 help
107 Set this to have arguments from the default kernel command string
108 override those passed by the boot loader.
109
110config NIOS2_CMDLINE_IGNORE_DTB
111 bool "Ignore kernel command string from DTB"
112 depends on CMDLINE_BOOL
113 depends on !CMDLINE_FORCE
114 default y
115 help
116 Set this to ignore the bootargs property from the devicetree's
117 chosen node and fall back to CMDLINE if nothing is passed.
118
119config NIOS2_PASS_CMDLINE
120 bool "Passed kernel command line from u-boot"
121 help
122 Use bootargs env variable from u-boot for kernel command line.
123 will override "Default kernel command string".
124 Say N if you are unsure.
125
126config NIOS2_BOOT_LINK_OFFSET
127 hex "Link address offset for booting"
128 default "0x00500000"
129 help
130 This option allows you to set the link address offset of the zImage.
131 This can be useful if you are on a board which has a small amount of
132 memory.
133
134endmenu
135
136menu "Advanced setup"
137
138config ADVANCED_OPTIONS
139 bool "Prompt for advanced kernel configuration options"
140
141comment "Default settings for advanced configuration options are used"
142 depends on !ADVANCED_OPTIONS
143
144config NIOS2_KERNEL_MMU_REGION_BASE_BOOL
145 bool "Set custom kernel MMU region base address"
146 depends on ADVANCED_OPTIONS
147 help
148 This option allows you to set the virtual address of the kernel MMU region.
149
150 Say N here unless you know what you are doing.
151
152config NIOS2_KERNEL_MMU_REGION_BASE
153 hex "Virtual base address of the kernel MMU region " if NIOS2_KERNEL_MMU_REGION_BASE_BOOL
154 default "0x80000000"
155 help
156 This option allows you to set the virtual base address of the kernel MMU region.
157
158config NIOS2_KERNEL_REGION_BASE_BOOL
159 bool "Set custom kernel region base address"
160 depends on ADVANCED_OPTIONS
161 help
162 This option allows you to set the virtual address of the kernel region.
163
164 Say N here unless you know what you are doing.
165
166config NIOS2_KERNEL_REGION_BASE
167 hex "Virtual base address of the kernel region " if NIOS2_KERNEL_REGION_BASE_BOOL
168 default "0xc0000000"
169
170config NIOS2_IO_REGION_BASE_BOOL
171 bool "Set custom I/O region base address"
172 depends on ADVANCED_OPTIONS
173 help
174 This option allows you to set the virtual address of the I/O region.
175
176 Say N here unless you know what you are doing.
177
178config NIOS2_IO_REGION_BASE
179 hex "Virtual base address of the I/O region" if NIOS2_IO_REGION_BASE_BOOL
180 default "0xe0000000"
181
182endmenu