Add bare metal support to ARM_MPS2_Target family of targets

[harmut01]

Summary of changes

Modify ARM_MPS2_Target target configuration to include bare metal as a supported profile, and add list of supported standard libraries. Remove hard coded values from the scatter files so that they are consistent with other targets. Changes affect the following targets: ARM_MPS2_M0, ARM_MPS2_M0P, ARM_MPS2_M3, ARM_MPS2_M4, and ARM_MPS2_M7.

Impact of changes

None

Migration actions required

None

Documentation

None

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Pull request type

[x] Patch update (Bug fix / Target update / Docs update / Test update / Refactor)
[] Feature update (New feature / Functionality change / New API)
[] Major update (Breaking change E.g. Return code change / API behaviour change)

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Test results

[] No Tests required for this change (E.g docs only update)
[x] Covered by existing mbed-os tests (Greentea or Unittest)
[] Tests / results supplied as part of this PR

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Reviewers

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[ciarmcom]

@harmut01, thank you for your changes.
@ARMmbed/mbed-os-maintainers please review.

[hugueskamba]

My comments apply to all scatter files.

[hugueskamba]

This does not match was there before as the size of :
RW_IRAM1 (0x20000000+0x100) (0x400000-0x100-Stack_Size) {

Now:
RW_IRAM1 MBED_RAM1_START MBED_RAM1_SIZE {

Should it be:
RW_IRAM1 MBED_RAM1_START (MBED_RAM1_SIZE-MBED_CONF_TARGET_BOOT_STACK_SIZE)

Is there a reason you changed it? Did you find it was incorrect? Can you double check with the MUSCA team?

[harmut01]

This is a mistake, I was trying to preserve the hard coded values. What seems to have changed is that in the original MBED_RAM1_SIZE = MBED_RAM_SIZE - MBED_CONF_TARGET_BOOT_STACK_SIZE - VECTOR_SIZE (which is equal to what you've suggested), although I thought RAM1 includes the fixed boot stack.

[hugueskamba]

Some boards have subtleties that are not always documented. So it is probably better to have a clear reason to change them if we are changing them.

[hugueskamba]

How is that region size calculated for the GCC_ARM toolchain linker file?

[harmut01]

@hugueskamba I've made the requested changes, I'm still a little uncertain about the RAM1 size calculation but I think my modifications preserve the original hard coded values.

[ciarmcom]

This pull request has automatically been marked as stale because it has had no recent activity. @ARMmbed/mbed-os-maintainers, please start CI to get the PR merged.

[0xc0170]

CI started

[mbed-ci]

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jobs	Status
jenkins-ci/mbed-os-ci_unittests	✔️
jenkins-ci/mbed-os-ci_cmake-example-ARM	✔️
jenkins-ci/mbed-os-ci_cmake-example-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_build-greentea-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_build-greentea-ARM	✔️
jenkins-ci/mbed-os-ci_build-cloud-example-ARM	✔️
jenkins-ci/mbed-os-ci_build-example-ARM	✔️
jenkins-ci/mbed-os-ci_build-cloud-example-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_build-example-GCC_ARM	✔️
jenkins-ci/mbed-os-ci_greentea-test	✔️
jenkins-ci/mbed-os-ci_cmake-example-test	✔️