arch/nios2/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0
   2 config NIOS2
   3         def_bool y
   4         select ARCH_32BIT_OFF_T
   5         select ARCH_HAS_SYNC_DMA_FOR_CPU
   6         select ARCH_HAS_SYNC_DMA_FOR_DEVICE
   7         select ARCH_HAS_UNCACHED_SEGMENT
   8         select ARCH_NO_SWAP
   9         select TIMER_OF
  10         select GENERIC_ATOMIC64
  11         select GENERIC_CLOCKEVENTS
  12         select GENERIC_CPU_DEVICES
  13         select GENERIC_IRQ_PROBE
  14         select GENERIC_IRQ_SHOW
  15         select GENERIC_STRNCPY_FROM_USER
  16         select GENERIC_STRNLEN_USER
  17         select HAVE_ARCH_TRACEHOOK
  18         select HAVE_ARCH_KGDB
  19         select IRQ_DOMAIN
  20         select MODULES_USE_ELF_RELA
  21         select OF
  22         select OF_EARLY_FLATTREE
  23         select SOC_BUS
  24         select SPARSE_IRQ
  25         select USB_ARCH_HAS_HCD if USB_SUPPORT
  26         select CPU_NO_EFFICIENT_FFS
  27         select MMU_GATHER_NO_RANGE if MMU
  28
  29 config GENERIC_CSUM
  30         def_bool y
  31
  32 config GENERIC_HWEIGHT
  33         def_bool y
  34
  35 config GENERIC_CALIBRATE_DELAY
  36         def_bool y
  37
  38 config NO_IOPORT_MAP
  39         def_bool y
  40
  41 config FPU
  42         def_bool n
  43
  44 config TRACE_IRQFLAGS_SUPPORT
  45         def_bool n
  46
  47 menu "Kernel features"
  48
  49 source "kernel/Kconfig.hz"
  50
  51 config FORCE_MAX_ZONEORDER
  52         int "Maximum zone order"
  53         range 9 20
  54         default "11"
  55         help
  56           The kernel memory allocator divides physically contiguous memory
  57           blocks into "zones", where each zone is a power of two number of
  58           pages.  This option selects the largest power of two that the kernel
  59           keeps in the memory allocator.  If you need to allocate very large
  60           blocks of physically contiguous memory, then you may need to
  61           increase this value.
  62
  63           This config option is actually maximum order plus one. For example,
  64           a value of 11 means that the largest free memory block is 2^10 pages.
  65
  66 endmenu
  67
  68 source "arch/nios2/platform/Kconfig.platform"
  69
  70 menu "Processor type and features"
  71
  72 config MMU
  73         def_bool y
  74
  75 config NR_CPUS
  76         int
  77         default "1"
  78
  79 config NIOS2_ALIGNMENT_TRAP
  80         bool "Catch alignment trap"
  81         default y
  82         help
  83           Nios II CPUs cannot fetch/store data which is not bus aligned,
  84           i.e., a 2 or 4 byte fetch must start at an address divisible by
  85           2 or 4. Any non-aligned load/store instructions will be trapped and
  86           emulated in software if you say Y here, which has a performance
  87           impact.
  88
  89 comment "Boot options"
  90
  91 config CMDLINE_BOOL
  92         bool "Default bootloader kernel arguments"
  93         default y
  94
  95 config CMDLINE
  96         string "Default kernel command string"
  97         default ""
  98         depends on CMDLINE_BOOL
  99         help
 100           On some platforms, there is currently no way for the boot loader to
 101           pass arguments to the kernel. For these platforms, you can supply
 102           some command-line options at build time by entering them here.  In
 103           other cases you can specify kernel args so that you don't have
 104           to set them up in board prom initialization routines.
 105
 106 config CMDLINE_FORCE
 107         bool "Force default kernel command string"
 108         depends on CMDLINE_BOOL
 109         help
 110           Set this to have arguments from the default kernel command string
 111           override those passed by the boot loader.
 112
 113 config NIOS2_CMDLINE_IGNORE_DTB
 114         bool "Ignore kernel command string from DTB"
 115         depends on CMDLINE_BOOL
 116         depends on !CMDLINE_FORCE
 117         default y
 118         help
 119           Set this to ignore the bootargs property from the devicetree's
 120           chosen node and fall back to CMDLINE if nothing is passed.
 121
 122 config NIOS2_PASS_CMDLINE
 123         bool "Passed kernel command line from u-boot"
 124         help
 125           Use bootargs env variable from u-boot for kernel command line.
 126           will override "Default kernel command string".
 127           Say N if you are unsure.
 128
 129 config NIOS2_BOOT_LINK_OFFSET
 130         hex "Link address offset for booting"
 131         default "0x00500000"
 132         help
 133           This option allows you to set the link address offset of the zImage.
 134           This can be useful if you are on a board which has a small amount of
 135           memory.
 136
 137 endmenu
 138
 139 menu "Advanced setup"
 140
 141 config ADVANCED_OPTIONS
 142         bool "Prompt for advanced kernel configuration options"
 143
 144 comment "Default settings for advanced configuration options are used"
 145         depends on !ADVANCED_OPTIONS
 146
 147 config NIOS2_KERNEL_MMU_REGION_BASE_BOOL
 148         bool "Set custom kernel MMU region base address"
 149         depends on ADVANCED_OPTIONS
 150         help
 151           This option allows you to set the virtual address of the kernel MMU region.
 152
 153           Say N here unless you know what you are doing.
 154
 155 config NIOS2_KERNEL_MMU_REGION_BASE
 156         hex "Virtual base address of the kernel MMU region " if NIOS2_KERNEL_MMU_REGION_BASE_BOOL
 157         default "0x80000000"
 158         help
 159           This option allows you to set the virtual base address of the kernel MMU region.
 160
 161 config NIOS2_KERNEL_REGION_BASE_BOOL
 162         bool "Set custom kernel region base address"
 163         depends on ADVANCED_OPTIONS
 164         help
 165           This option allows you to set the virtual address of the kernel region.
 166
 167           Say N here unless you know what you are doing.
 168
 169 config NIOS2_KERNEL_REGION_BASE
 170         hex "Virtual base address of the kernel region " if NIOS2_KERNEL_REGION_BASE_BOOL
 171         default "0xc0000000"
 172
 173 config NIOS2_IO_REGION_BASE_BOOL
 174         bool "Set custom I/O region base address"
 175         depends on ADVANCED_OPTIONS
 176         help
 177           This option allows you to set the virtual address of the I/O region.
 178
 179           Say N here unless you know what you are doing.
 180
 181 config NIOS2_IO_REGION_BASE
 182         hex "Virtual base address of the I/O region" if NIOS2_IO_REGION_BASE_BOOL
 183         default "0xe0000000"
 184
 185 endmenu