projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| b920de1b DH |
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. |