The mseccfg register is an optional read/write register that controls
security features. It only exists when PMP is enabled (C_PMP_ENTRIES > 0) and PMP Enhancements for memory access and
execution prevention on Machine mode (Smepmp) is enabled (C_PMP_ENHANCEMENTS > 0).
Figure 1. Machine Security Configuration Register
| Bits | Name | Description | Reset Value |
|---|---|---|---|
| 2 | RLB | Rule Locking Bypass | 0 |
| 1 | MMWP | Machine Mode Whitelist Policy | 0 |
| 0 | MML | Machine Mode Lockdown | 0 |