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_161779

 > -  /* disable super watchdog write protection */
 > -  RTC_WRITE( RTC_CNTL_SWD_WPROTECT_REG, RTC_CNTL_SWD_WPROTECT_KEY );
 > -
 > -  /* Set SWD auto feed */
 > +  RTC_WRITE(
 > +    RTC_CNTL_WDTCONFIG0_REG,
 > +    wdt_config0 & ~( RTC_CNTL_WDTCONFIG0_EN | RTC_CNTL_WDT_FLASHBOOT_MOD_EN )
 > +  );
 > +  RTC_WRITE( RTC_CNTL_WDTWPROTECT_REG, WDT_WPROTECT_LOCK );
 > +
 > +  /*
 > +   * The super watchdog cannot be disabled, only fed.  With auto-feed enabled
 > +   * its controller feeds it without any help from the CPU
 > +   * (section 12.3.2.2).
 > +   */
 > +  RTC_WRITE( RTC_CNTL_SWD_WPROTECT_REG, RTC_CNTL_SWD_WKEY_VALUE );

**Reference code for the super watchdog auto-feed.** ESP-IDF's C3 bootloader, [`bootloader_super_wdt_auto_feed()`](https://github.com/espressif/esp-idf/blob/0e6b480f858c69862ffb6001d96e9eef74599a6e/components/bootloader_support/src/esp32c3/bootloader_esp32c3.c#L74-L79), does the same three writes: key, set `RTC_CNTL_SWD_AUTO_FEED_EN`, then 0. It is [called from the C3 hardware init](https://github.com/espressif/esp-idf/blob/0e6b480f858c69862ffb6001d96e9eef74599a6e/components/bootloader_support/src/esp32c3/bootloader_esp32c3.c#L130). Zephyr's no-bootloader path calls the equivalent [`super_wdt_auto_feed()`](https://github.com/zephyrproject-rtos/zephyr/blob/d1b8eec76bfd14058854245d09aa1e413e355c4a/soc/espressif/esp32c3/hw_init.c#L36).

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1555#note_161779
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