arch/nios2/platform/Kconfig.platform

   1 menu "Platform options"
   2
   3 comment "Memory settings"
   4
   5 config NIOS2_MEM_BASE
   6         hex "Memory base address"
   7         default "0x00000000"
   8         help
   9           This is the physical address of the memory that the kernel will run
  10           from. This address is used to link the kernel and setup initial memory
  11           management. You should take the raw memory address without any MMU
  12           or cache bits set.
  13           Please not that this address is used directly so you have to manually
  14           do address translation if it's connected to a bridge.
  15
  16 comment "Device tree"
  17
  18 config NIOS2_DTB_AT_PHYS_ADDR
  19         bool "DTB at physical address"
  20         default n
  21         help
  22           When enabled you can select a physical address to load the dtb from.
  23           Normally this address is passed by a bootloader such as u-boot but
  24           using this you can use a devicetree without a bootloader.
  25           This way you can store a devicetree in NOR flash or an onchip rom.
  26           Please note that this address is used directly so you have to manually
  27           do address translation if it's connected to a bridge. Also take into
  28           account that when using an MMU you'd have to ad 0xC0000000 to your
  29           address
  30
  31 config NIOS2_DTB_PHYS_ADDR
  32         hex "DTB Address"
  33         depends on NIOS2_DTB_AT_PHYS_ADDR
  34         default "0xC0000000"
  35         help
  36           Physical address of a dtb blob.
  37
  38 config NIOS2_DTB_SOURCE_BOOL
  39         bool "Compile and link device tree into kernel image"
  40         default n
  41         help
  42           This allows you to specify a dts (device tree source) file
  43           which will be compiled and linked into the kernel image.
  44
  45 config NIOS2_DTB_SOURCE
  46         string "Device tree source file"
  47         depends on NIOS2_DTB_SOURCE_BOOL
  48         default ""
  49         help
  50           Absolute path to the device tree source (dts) file describing your
  51           system.
  52
  53 comment "Nios II instructions"
  54
  55 config NIOS2_HW_MUL_SUPPORT
  56         bool "Enable MUL instruction"
  57         default n
  58         help
  59           Set to true if you configured the Nios II to include the MUL
  60           instruction.  This will enable the -mhw-mul compiler flag.
  61
  62 config NIOS2_HW_MULX_SUPPORT
  63         bool "Enable MULX instruction"
  64         default n
  65         help
  66           Set to true if you configured the Nios II to include the MULX
  67           instruction.  Enables the -mhw-mulx compiler flag.
  68
  69 config NIOS2_HW_DIV_SUPPORT
  70         bool "Enable DIV instruction"
  71         default n
  72         help
  73           Set to true if you configured the Nios II to include the DIV
  74           instruction.  Enables the -mhw-div compiler flag.
  75
  76 config NIOS2_FPU_SUPPORT
  77         bool "Custom floating point instr support"
  78         default n
  79         help
  80           Enables the -mcustom-fpu-cfg=60-1 compiler flag.
  81
  82 config NIOS2_CI_SWAB_SUPPORT
  83         bool "Byteswap custom instruction"
  84         default n
  85         help
  86           Use the byteswap (endian converter) Nios II custom instruction provided
  87           by Altera and which can be enabled in QSYS builder. This accelerates
  88           endian conversions in the kernel (e.g. ntohs).
  89
  90 config NIOS2_CI_SWAB_NO
  91         int "Byteswap custom instruction number" if NIOS2_CI_SWAB_SUPPORT
  92         default 0
  93         help
  94           Number of the instruction as configured in QSYS Builder.
  95
  96 comment "Cache settings"
  97
  98 config CUSTOM_CACHE_SETTINGS
  99         bool "Custom cache settings"
 100         help
 101           This option allows you to tweak the cache settings used during early
 102           boot (where the information from device tree is not yet available).
 103           There should be no reason to change these values. Linux will work
 104           perfectly fine, even if the Nios II is configured with smaller caches.
 105
 106           Say N here unless you know what you are doing.
 107
 108 config NIOS2_DCACHE_SIZE
 109         hex "D-Cache size" if CUSTOM_CACHE_SETTINGS
 110         range 0x200 0x10000
 111         default "0x800"
 112         help
 113           Maximum possible data cache size.
 114
 115 config NIOS2_DCACHE_LINE_SIZE
 116         hex "D-Cache line size" if CUSTOM_CACHE_SETTINGS
 117         range 0x10 0x20
 118         default "0x20"
 119         help
 120           Minimum possible data cache line size.
 121
 122 config NIOS2_ICACHE_SIZE
 123         hex "I-Cache size" if CUSTOM_CACHE_SETTINGS
 124         range 0x200 0x10000
 125         default "0x1000"
 126         help
 127           Maximum possible instruction cache size.
 128
 129 endmenu