1
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 select SET_FS
28
29config GENERIC_CSUM
30 def_bool y
31
32config GENERIC_HWEIGHT
33 def_bool y
34
35config GENERIC_CALIBRATE_DELAY
36 def_bool y
37
38config NO_IOPORT_MAP
39 def_bool y
40
41config FPU
42 def_bool n
43
44menu "Kernel features"
45
46source "kernel/Kconfig.hz"
47
48config FORCE_MAX_ZONEORDER
49 int "Maximum zone order"
50 range 9 20
51 default "11"
52 help
53 The kernel memory allocator divides physically contiguous memory
54 blocks into "zones", where each zone is a power of two number of
55 pages. This option selects the largest power of two that the kernel
56 keeps in the memory allocator. If you need to allocate very large
57 blocks of physically contiguous memory, then you may need to
58 increase this value.
59
60 This config option is actually maximum order plus one. For example,
61 a value of 11 means that the largest free memory block is 2^10 pages.
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
183
