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

[Sam Price (@TheSamPrice)]

Sam Price started a new discussion on bsps/riscv/esp32/start/bspstart.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1555#note_161781

 > +  /*
 > +   * Timer group 0's watchdog follows the same procedure as the RTC watchdog,
 > +   * with its own key register.  Its configuration registers are updated
 > +   * asynchronously, so the change only takes effect once
 > +   * TIMG_WDT_CONF_UPDATE_EN is written (register 11.10).
 > +   */
 > +  TIMG_WRITE( TIMG_WDTWPROTECT_REG, WDT_WKEY_VALUE );
 >    timg_wdtconfig0 = TIMG_READ( TIMG_WDTCONFIG0_REG );
 > -  TIMG_WRITE( TIMG_WDTCONFIG0_REG, timg_wdtconfig0 & TIMG_WDTCONFIG0_EN );
 > +  TIMG_WRITE(
 > +    TIMG_WDTCONFIG0_REG,
 > +    timg_wdtconfig0 & ~( TIMG_WDTCONFIG0_EN | TIMG_WDT_FLASHBOOT_MOD_EN )
 > +  );
 > +  TIMG_WRITE(
 > +    TIMG_WDTCONFIG0_REG,
 > +    TIMG_READ( TIMG_WDTCONFIG0_REG ) | TIMG_WDT_CONF_UPDATE_EN

**Reference code for `TIMG_WDT_CONF_UPDATE_EN`.** ESP-IDF's [`mwdt_ll_set_flashboot_en()`](https://github.com/espressif/esp-idf/blob/0e6b480f858c69862ffb6001d96e9eef74599a6e/components/esp_hal_wdt/esp32c3/include/hal/mwdt_ll.h#L190-L195) clears `wdt_flashboot_mod_en` and then sets `wdt_conf_update_en = 1`, with the comment "Config registers are updated asynchronously". Every other `TIMG_WDTCONFIG0` setter in that file does the same (for example [L122](https://github.com/espressif/esp-idf/blob/0e6b480f858c69862ffb6001d96e9eef74599a6e/components/esp_hal_wdt/esp32c3/include/hal/mwdt_ll.h#L122) and [L177](https://github.com/espressif/esp-idf/blob/0e6b480f858c69862ffb6001d96e9eef74599a6e/components/esp_hal_wdt/esp32c3/include/hal/mwdt_ll.h#L177)).

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1555#note_161781
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