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TOMOYO Linux Cross Reference
Linux/arch/nios2/Kconfig

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  1 # SPDX-License-Identifier: GPL-2.0
  2 config 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 
 31 config GENERIC_CSUM
 32         def_bool y
 33 
 34 config GENERIC_HWEIGHT
 35         def_bool y
 36 
 37 config GENERIC_CALIBRATE_DELAY
 38         def_bool y
 39 
 40 config NO_IOPORT_MAP
 41         def_bool y
 42 
 43 config FPU
 44         def_bool n
 45 
 46 menu "Kernel features"
 47 
 48 source "kernel/Kconfig.hz"
 49 
 50 config 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 
 63 endmenu
 64 
 65 source "arch/nios2/platform/Kconfig.platform"
 66 
 67 menu "Processor type and features"
 68 
 69 config MMU
 70         def_bool y
 71 
 72 config NR_CPUS
 73         int
 74         default "1"
 75 
 76 config 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 
 86 comment "Boot options"
 87 
 88 config CMDLINE_BOOL
 89         bool "Default bootloader kernel arguments"
 90         default y
 91 
 92 config 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 
103 config 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 
110 config 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 
119 config 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 
126 config 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 
134 endmenu
135 
136 menu "Advanced setup"
137 
138 config ADVANCED_OPTIONS
139         bool "Prompt for advanced kernel configuration options"
140 
141 comment "Default settings for advanced configuration options are used"
142         depends on !ADVANCED_OPTIONS
143 
144 config 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 
152 config 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 
158 config 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 
166 config NIOS2_KERNEL_REGION_BASE
167         hex "Virtual base address of the kernel region " if NIOS2_KERNEL_REGION_BASE_BOOL
168         default "0xc0000000"
169 
170 config 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 
178 config NIOS2_IO_REGION_BASE
179         hex "Virtual base address of the I/O region" if NIOS2_IO_REGION_BASE_BOOL
180         default "0xe0000000"
181 
182 endmenu

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