[riot-notifications] [RIOT-OS/RIOT] sys/bit: provide CPU_HAS_SRAM_BITBAND [backport 2021.01] (#15812)

Marian Buschsieweke notifications at github.com
Wed Jan 20 10:44:45 CET 2021

# Backport of #15809

### Contribution description

- Add `CPU_HAS_SRAM_BITBAND` flag to allow checking whether all of SRAM has proper bit-banding support
- Use this in the Cortex M implementation of `atomic_utils`

### Testing procedure

make BOARD=frdm-k64f -C tests/sys_atomic_utils_unittests flash test

### Issues/PRs references

Reported by @fjmolinas, fixes https://github.com/RIOT-OS/RIOT/issues/15810
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-- Commit Summary --

  * sys/bit: provide CPU_HAS_SRAM_BITBAND
  * cpu/cortexm_common: fix atomic_utils_arch.h

-- File Changes --

    M cpu/cortexm_common/include/atomic_utils_arch.h (2)
    M cpu/kinetis/include/cpu_conf.h (4)
    M sys/include/bit.h (22)

-- Patch Links --


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