mbed_rtx.h file cleanup

[jeromecoutant]

Description

Proposition is to clean every targets/TARGET_xxx/mbed_rtx.h files

• INITIAL_SP definition is no more used (since Interrupt stack size unification + test #9092)
• HEAP_START/HEAP_SIZE/ISR_STACK_START/ISR_STACK_SIZE seems to be common for lots of targets ?

Issue request type

[ ] Question
[x] Enhancement
[ ] Bug

[ciarmcom]

Internal Jira reference: https://jira.arm.com/browse/MBOCUSTRIA-843

[0xc0170]

cc @mprse

[mprse]

@deepikabhavnani prepares the general solution for moving to 2 region memory model. Handling of INITIAL_SP and HEAP_START/HEAP_SIZE/ISR_STACK_START/ISR_STACK_SIZE macros is a part of this process.

[deepikabhavnani]

@jeromecoutant
Agree with this enhancement, INITIAL_SP is not used in Mbed OS 5

mbed-os/rtos/TARGET_CORTEX/mbed_boot.c

Line 46 in 7546186

* -Value INITIAL_SP is ignored

But we cannot remove it to maintain backward compatibility with Mbed 2 + CMSIS RTOS version 2. We will pick up this enhancement in future versions.

Along with this cleanup of linker files is needed as well. We have duplicate exports like __heap_limit and __HeapLimit

[cmonr]

@SenRamakri Fyi

[ciarmcom]

Thank you for raising this issue. Please note we have updated our policies and
now only defects should be raised directly in GitHub. Going forward questions and
enhancements will be considered in our forums, https://forums.mbed.com/ . If this
issue is still relevant please re-raise it there.
This GitHub issue will now be closed.