This description will be updated in the near future.
| ICACHE_PRELOAD_INT_ST | The bit is used to indicate the interrupt by icache pre-load done. |
| ICACHE_PRELOAD_INT_ENA | The bit is used to enable the interrupt by icache pre-load done. |
| ICACHE_PRELOAD_INT_CLR | The bit is used to clear the interrupt by icache pre-load done. |