Nordic NRF52832 cache ON

[tymoteuszblochmobica]

Description

Nordic NRF52832 chip onboard instruction cache is turned ON to decrease execution time and improve performance.

Pull request type

[ ] Fix
[ ] Refactor
[x] Target update
[ ] Functionality change
[ ] Docs update
[ ] Test update
[ ] Breaking change

Reviewers

@kjbracey-arm
@pan-

Release Notes

[ciarmcom]

@tymoteuszblochmobica, thank you for your changes.
@kjbracey-arm @pan- @ARMmbed/mbed-os-maintainers please review.

[bulislaw]

@kjbracey-arm @pan- does it require some clever flushing? Eg in bootloader cases?

[kjbracey]

I wouldn't think so. It's a cache integrated in to the non-volatile memory controller, and it's the same peripheral as used for programming, so I'd expect it to be self-aware. But that's me guessing without reading the manual. Someone should check.

[kjbracey]

Also, I understand the cache is turned on by SoftDevice anyway, so this will only affect non-SoftDevice builds. No idea how SoftDevice + bootloader interact though.

[0Grit]

@trowbridgec @AGlass0fMilk @farrenv

[0xc0170]

CI started

[mbed-ci]

Test run: SUCCESS

Summary: 11 of 11 test jobs passed
Build number : 1
Build artifacts

[0xc0170]

@kjbracey-arm @pan- Before merging, all good with this change?

[pan-]

I didn't changed my mind. LGTM.

[0Grit]

Is the cache already on in NRF52840?

[0xc0170]

Is the cache already on in NRF52840?

worth checking!