1 ========================================= 2 PART-SPECIFIC SOURCE COMPARTMENTALISATION 3 ========================================= 4 5The 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============ 47COMPILE TIME 48============ 49 50When the kernel is compiled, symbolic links will be made in the asm header file 51directory 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 56So that the header files contained in those directories can be accessed without 57lots of #ifdef-age. 58 59The appropriate arch/mn10300/unit-ZZZZ directory will also be entered by the 60compilation process; all other unit-specific directories will be ignored. 61