RTEMS | Draft: bsps/riscv/esp32: Disable the watchdogs bsp_start() means to disable (!1555)

Tue Nov 3 05:21:20 UTC 2026

Sam Price started a new discussion on bsps/riscv/esp32/start/bspstart.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1555#note_161777

 >  #define RTC_CNTL_SWD_CONF_REG          (uintptr_t) 0xac
 >  #define RTC_CNTL_SWD_CONF_AUTO_FEED_EN BSP_BIT32( 31 )
 >  
 > +/* Register 9.39, RTC_CNTL_SWD_WPROTECT_REG (0x00B0), page 255 */
 >  #define RTC_CNTL_SWD_WPROTECT_REG (uintptr_t) 0xb0
 > -#define RTC_CNTL_SWD_WPROTECT_KEY 0x8f1d312aU
 >  
 > +/*
 > + * Section 12.3.2.2, Workflow, page 310:
 > + *
 > + *   "When trying to feed SWD, CPU needs to disable SWD controller's write
 > + *   protection by writing 0x8F1D312A to RTC_CNTL_SWD_WKEY."
 > + *
 > + * The super watchdog's key differs from the digital watchdogs' key above.
 > + */
 > +#define RTC_CNTL_SWD_WKEY_VALUE 0x8f1d312aU

**Reference code for the super watchdog key.** ESP-IDF defines the same value as [`RTC_CNTL_SWD_WKEY_VALUE`](https://github.com/espressif/esp-idf/blob/0e6b480f858c69862ffb6001d96e9eef74599a6e/components/esp_hal_wdt/esp32c3/include/hal/rwdt_ll.h#L26), `0x8F1D312A`.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1555#note_161777
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