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