linux/Documentation/frv/configuring.txt
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   1                   =======================================
   2                   FUJITSU FR-V LINUX KERNEL CONFIGURATION
   3                   =======================================
   4
   5=====================
   6CONFIGURATION OPTIONS
   7=====================
   8
   9The most important setting is in the "MMU support options" tab (the first
  10presented in the configuration tools available):
  11
  12 (*) "Kernel Type"
  13
  14     This options allows selection of normal, MMU-requiring linux, and uClinux
  15     (which doesn't require an MMU and doesn't have inter-process protection).
  16
  17There are a number of settings in the "Processor type and features" section of
  18the kernel configuration that need to be considered.
  19
  20 (*) "CPU"
  21
  22     The register and instruction sets at the core of the processor. This can
  23     only be set to "FR40x/45x/55x" at the moment - but this permits usage of
  24     the kernel with MB93091 CB10, CB11, CB30, CB41, CB60, CB70 and CB451
  25     CPU boards, and with the MB93093 PDK board.
  26
  27 (*) "System"
  28
  29     This option allows a choice of basic system. This governs the peripherals
  30     that are expected to be available.
  31
  32 (*) "Motherboard"
  33
  34     This specifies the type of motherboard being used, and the peripherals
  35     upon it. Currently only "MB93090-MB00" can be set here.
  36
  37 (*) "Default cache-write mode"
  38
  39     This controls the initial data cache write management mode. By default
  40     Write-Through is selected, but Write-Back (Copy-Back) can also be
  41     selected. This can be changed dynamically once the kernel is running (see
  42     features.txt).
  43
  44There are some architecture specific configuration options in the "General
  45Setup" section of the kernel configuration too:
  46
  47 (*) "Reserve memory uncached for (PCI) DMA"
  48
  49     This requests that a uClinux kernel set aside some memory in an uncached
  50     window for the use as consistent DMA memory (mainly for PCI). At least a
  51     megabyte will be allocated in this way, possibly more. Any memory so
  52     reserved will not be available for normal allocations.
  53
  54 (*) "Kernel support for ELF-FDPIC binaries"
  55
  56     This enables the binary-format driver for the new FDPIC ELF binaries that
  57     this platform normally uses. These binaries are totally relocatable -
  58     their separate sections can relocated independently, allowing them to be
  59     shared on uClinux where possible. This should normally be enabled.
  60
  61 (*) "Kernel image protection"
  62
  63     This makes the protection register governing access to the core kernel
  64     image prohibit access by userspace programs. This option is available on
  65     uClinux only.
  66
  67There are also a number of settings in the "Kernel Hacking" section of the
  68kernel configuration especially for debugging a kernel on this
  69architecture. See the "gdbstub.txt" file for information about those.
  70
  71
  72======================
  73DEFAULT CONFIGURATIONS
  74======================
  75
  76The kernel sources include a number of example default configurations:
  77
  78 (*) defconfig-mb93091
  79
  80     Default configuration for the MB93091-VDK with both CPU board and
  81     MB93090-MB00 motherboard running uClinux.
  82
  83
  84 (*) defconfig-mb93091-fb
  85
  86     Default configuration for the MB93091-VDK with CPU board,
  87     MB93090-MB00 motherboard, and DAV board running uClinux.
  88     Includes framebuffer driver.
  89
  90
  91 (*) defconfig-mb93093
  92
  93     Default configuration for the MB93093-PDK board running uClinux.
  94
  95
  96 (*) defconfig-cb70-standalone
  97
  98     Default configuration for the MB93091-VDK with only CB70 CPU board
  99     running uClinux. This will use the CB70's DM9000 for network access.
 100
 101
 102 (*) defconfig-mmu
 103
 104     Default configuration for the MB93091-VDK with both CB451 CPU board and
 105     MB93090-MB00 motherboard running MMU linux.
 106
 107 (*) defconfig-mmu-audio
 108
 109     Default configuration for the MB93091-VDK with CB451 CPU board, DAV
 110     board, and MB93090-MB00 motherboard running MMU linux. Includes
 111     audio driver.
 112
 113 (*) defconfig-mmu-fb
 114
 115     Default configuration for the MB93091-VDK with CB451 CPU board, DAV
 116     board, and MB93090-MB00 motherboard running MMU linux. Includes
 117     framebuffer driver.
 118
 119 (*) defconfig-mmu-standalone
 120
 121     Default configuration for the MB93091-VDK with only CB451 CPU board
 122     running MMU linux.
 123
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