Atomic write (LDAXR/STLXR) causes infinite loop on Cortex-A72

I have code which runs on Cortex-A72 (AArch64) and it disassembles to the following: 0: d53800a9 mrs x9, mpidr_el1 4: 92400529 and x9, x9, #0x3 8: b4000069 cbz x9, 0x14 c: d503205f wfe 10: 17ffffff...
Atomic write (LDAXR/STLXR) causes infinite loop on Cortex-A72

I have code which runs on Cortex-A72 (AArch64) and it disassembles to the following: 0: d53800a9 mrs x9, mpidr_el1 4: 92400529 and x9, x9, #0x3 8: b4000069 cbz x9, 0x14 c: d503205f wfe 10: 17ffffff...
What's the difference between ETM and Debug?

In the ARM core such as cortex-R4, it has ETM and Debug so I want ask What's the difference between ETM and Debug?
What's the difference between os_itv_wait and os_dly_wait?

Hello I'm a newer to RL-ARM and I found that there're two wait function os_itv_wait and os_dly_wait in RL-ARM. Who can tell me what's the difference between them? For example is it possible to replace...
What's the difference between ETM and Debug?

In the ARM core such as cortex-R4, it has ETM and Debug so I want ask What's the difference between ETM and Debug?