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cortexm: Add comment on CPUID register

This commit is contained in:
Fredrik Ahlberg 2020-07-12 22:54:39 +02:00
parent 4391851f4d
commit 7ebb94d134
1 changed files with 5 additions and 0 deletions
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5
src/target/cortexm.c
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@ -310,6 +310,11 @@ bool cortexm_probe(ADIv5_AP_t *ap, bool forced)
t->driver = cortexm_driver_str;
/* The CPUID register is defined in the ARMv7-M and ARMv8-M
* architecture manuals. The PARTNO field is implementation defined,
* that is, the actual values are found in the Technical Reference Manual
* for each Cortex-M core.
*/
uint32_t cpuid = target_mem_read32(t, CORTEXM_CPUID);
uint16_t partno = (cpuid >> 4) & 0xfff;