Documentation/mn10300/compartmentalisation.txt

   1                    =========================================
   2                    PART-SPECIFIC SOURCE COMPARTMENTALISATION
   3                    =========================================
   4
   5 The sources for various parts are compartmentalised at two different levels:
   6
   7  (1) Processor level
   8
   9      The "processor level" is a CPU core plus the other on-silicon
  10      peripherals.
  11
  12      Processor-specific header files are divided among directories in a similar
  13      way to the CPU level:
  14
  15         (*) include/asm-mn10300/proc-mn103e010/
  16
  17             Support for the AM33v2 CPU core.
  18
  19      The appropriate processor is selected by a CONFIG_MN10300_PROC_YYYY option
  20      from the "Processor support" choice menu in the arch/mn10300/Kconfig file.
  21
  22
  23  (2) Unit level
  24
  25      The "unit level" is a processor plus all the external peripherals
  26      controlled by that processor.
  27
  28      Unit-specific header files are divided among directories in a similar way
  29      to the CPU level; not only that, but specific sources may also be
  30      segregated into separate directories under the arch directory:
  31
  32         (*) include/asm-mn10300/unit-asb2303/
  33         (*) arch/mn10300/unit-asb2303/
  34
  35             Support for the ASB2303 board with an ASB2308 daughter board.
  36
  37         (*) include/asm-mn10300/unit-asb2305/
  38         (*) arch/mn10300/unit-asb2305/
  39
  40             Support for the ASB2305 board.
  41
  42      The appropriate processor is selected by a CONFIG_MN10300_UNIT_ZZZZ option
  43      from the "Unit type" choice menu in the arch/mn10300/Kconfig file.
  44
  45
  46 ============
  47 COMPILE TIME
  48 ============
  49
  50 When the kernel is compiled, symbolic links will be made in the asm header file
  51 directory for this arch:
  52
  53         include/asm-mn10300/proc => include/asm-mn10300/proc-YYYY/
  54         include/asm-mn10300/unit => include/asm-mn10300/unit-ZZZZ/
  55
  56 So that the header files contained in those directories can be accessed without
  57 lots of #ifdef-age.
  58
  59 The appropriate arch/mn10300/unit-ZZZZ directory will also be entered by the
  60 compilation process; all other unit-specific directories will be ignored.