The following features are not supported on this family of devices:
- ARM architectural Spinlock
instructions (LDREX,STREX)
- Any use model other than binary mutex (for
example, counting semaphore, lockless
programming): Spinlock MMR is a single binary 0,1
implemented by a state machine.
- 64-bit accesses: Spinlock MMRs are aligned on
32-bit boundaries meaning a 64-bit access affects
the state of 2 Spinlocks.