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Add new common.inc, which is common_rom.inc with some
DEFINED(_FLASH_BUILD) usages thrown in to allow for RAM builds. It
also uses a new REGION_RODATA region alias for read-only data.
Move section .USER_FLASH to REGION_RODATA. This means it lives in RAM
under RAM builds. Although this might be surprising, not doing so
would make RAM builds useless.
Modify the individual board linker scripts to properly set
REGION_RODATA and _FLASH_BUILD before calling out to common.inc.
Delete common_rom.inc, common_ram.inc, common_header.inc, in favor of
common.inc. This should fix RAM builds on all boards.
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- common_header.inc: Declare EXTERN symbols _lm_heap_start and
_lm_heap_end.
- common_rom.inc: Check for _lm_heap_start and _lm_heap_end. If they
are defined, preserve their values. Otherwise, _lm_heap_start is
starts after .bss, and _lm_heap_end is the end of SRAM.
This allows existing linker scripts to continue using the old heap
scheme, but allows for customizability elsewhere.
- syscalls.c: Respect the addresses of _lm_heap_start and _lm_heap_end
as the boundaries of the heap in _sbrk().
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The linker scripts share an initial section. Factor this out into a
new file common_header.inc, and have the main linker scripts include
this file. Apart from eliminating a redundancy, this will make it
easier to add new linker scripts in the future.
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