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A speciality of the RTEMS build system was the make preinstall step. It
copied header files from arbitrary locations into the build tree. The
header files were included via the -Bsome/build/tree/path GCC command
line option.
This has at least seven problems:
* The make preinstall step itself needs time and disk space.
* Errors in header files show up in the build tree copy. This makes it
hard for editors to open the right file to fix the error.
* There is no clear relationship between source and build tree header
files. This makes an audit of the build process difficult.
* The visibility of all header files in the build tree makes it
difficult to enforce API barriers. For example it is discouraged to
use BSP-specifics in the cpukit.
* An introduction of a new build system is difficult.
* Include paths specified by the -B option are system headers. This
may suppress warnings.
* The parallel build had sporadic failures on some hosts.
This patch removes the make preinstall step. All installed header
files are moved to dedicated include directories in the source tree.
Let @RTEMS_CPU@ be the target architecture, e.g. arm, powerpc, sparc,
etc. Let @RTEMS_BSP_FAMILIY@ be a BSP family base directory, e.g.
erc32, imx, qoriq, etc.
The new cpukit include directories are:
* cpukit/include
* cpukit/score/cpu/@RTEMS_CPU@/include
* cpukit/libnetworking
The new BSP include directories are:
* bsps/include
* bsps/@RTEMS_CPU@/include
* bsps/@RTEMS_CPU@/@RTEMS_BSP_FAMILIY@/include
There are build tree include directories for generated files.
The include directory order favours the most general header file, e.g.
it is not possible to override general header files via the include path
order.
The "bootstrap -p" option was removed. The new "bootstrap -H" option
should be used to regenerate the "headers.am" files.
Update #3254.
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Define ARM_CP15_TEXT_SECTION to BSP_START_TEXT_SECTION so that the
start code is in the right section.
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Invalidate entire branch predictor array.
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Enable SCU only on the boot processor.
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Add arm_a9mpcore_start_enable_smp_in_auxiliary_control().
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Add arm_a9mpcore_start_on_secondary_processor(). Rely on error checks
in _SMP_Start_multitasking_on_secondary_processor().
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Move the RTEMS_SMP conditional compilation to the detection method of arm erratum 764369
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Execute the SCU part of the workaround of arm erratum 764368 after the SCU was enabled.
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Rename rtems_smp_process_interrupt() into
_SMP_Inter_processor_interrupt_handler(). Delete unused header file
<rtems/bspsmp.h>.
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Rename rtems_smp_secondary_cpu_initialize() into
_SMP_Start_multitasking_on_secondary_processor(). Move declaration to
<rtems/score/smpimpl.h>.
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Use the Global Timer for the Cortex-A9 MPCore clock driver instead of
the Private Timer. This enables a consistent nanoseconds since last
context switch value across all processors.
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