Add a "used" attribute to __vector_handlers to fix ARMC6 build with
the "-flto" flag.
(Error: L6236E: No section matches selector - no section to be FIRST/LAST.)
This attribute, attached to a function/variable, means that code must be emitted
for the function even if it appears that the function is not referenced.
At IAR linking, the default method of 'initialize by copy' is 'auto', which will estimate
different packing algorithms, including complex 'lz77', for smallest memory footprint. But
the algorithm itself can consume some SRAM and cause OOM at linking time for NANO130, which
just has 16KiB SRAM. To avoid this error, always choose 'none' packing algorithm.
On ARMC6 with optimization level "-Os", the two functions NVIC_SetVector/NVIC_GetVector
will be translated to illegal instruction for trapping due to NVIC_FLASH_VECTOR_ADDRESS
defined as direct 0. Fixed by defining NVIC_FLASH_VECTOR_ADDRESS as a symbol instead to
avoid such optimization error.
Instead of user defined symbols in assembly files or C files,
use linker scripts to add heap and stack - this is inconsistent
with ARM std linker scripts
--legacyalign, --no_legacyalign are deprecated from ARMC6 compiler, in order to
remove deprecated flags all linker files (GCC and IAR as well to have uniformity)
should strictly align to 8-byte boundary
Set the ISR stack to be 1KB. https://github.com/ARMmbed/mbed-os/pull/7238
Set the heap size to 3KB(2KB + overhead + spare) so that atleast 2KB free ram is
available for testing.
With dynamic heap size, explicit size is not required. IAR 7.8 supports
static heap, hence the change is needed in IAR linker files.
IAR 7.8 does not support dynamic heap, and some test/addition of new
feature fail on this device because of less static RAM memory.
Reducing the heap memory size for the same reason.
1. With mbed OS 5, mbed_sdk_init() is ensured to call before C++ global object constructor.
2. Refine startup file with GCC_ARM toolchain related to this modification.
1. Support CMSIS_VECTAB_VIRTUAL feature
2. Reduce the register sync waiting time in LP ticker
3. Adjust the stack and heap size in GCC and IAR toolchains
Maciej Bocianski
cyliangtw
Chun-Chieh Li
deepikabhavnani
Anna Bridge
Oren Cohen
Cruz Monrreal
Jimmy Brisson
MS30 CCChang12