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<a href="https://gitlab.rtems.org/TheSamPrice">Sam Price</a> created a merge request: <a href="https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/1555">!1555</a>
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Project:Branches: TheSamPrice/rtems:esp32c3-watchdog-disable to rtems/rtos/rtems:main
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Author: Sam Price
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<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial"><code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0px; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">bsp_start()</code> is meant to turn off the RTC and timer group 0 watchdogs. It turns off neither, for two reasons:</p>
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<strong style="font-weight: 600; margin-top: 0px;">The TIMG0 write-protect key is never written.</strong> The RTC watchdog gets its key, but timer group 0 has its own write protection (same key value), so every write to <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 0.125rem 0.25rem;">TIMG_WDTCONFIG0</code> is silently thrown away.</li>
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<strong style="font-weight: 600; margin-top: 0px;">Flash-boot mode keeps the watchdog running.</strong> <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 0.125rem 0.25rem;">TIMG_WDT_FLASHBOOT_MOD_EN</code> and <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 0.125rem 0.25rem;">RTC_CNTL_WDT_FLASHBOOT_MOD_EN</code> reset to 1 and keep the watchdog armed even with its enable bit clear. ESP-IDF's second-stage bootloader clears them, so ESP-IDF applications never hit this. A direct-boot image like this BSP always does. Read back on hardware: <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; white-space: pre-wrap; overflow-wrap: break-word; word-break: keep-all; padding: 0.125rem 0.25rem;">TIMG_WDTCONFIG0 = 0x0004c000</code>, enable clear and flash-boot mode set.</li>
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<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial">The timeout is about 1.5 s. Anything that finishes sooner looks healthy, which is why it went unnoticed until a WiFi application idled in a 2 s <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; margin-top: 0px; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">rtems_task_wake_after()</code> and the chip reset with <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">rst:0x7 (TG0WDT_SYS_RST)</code>.</p>
<p dir="auto" style="color: #3a383f; margin: 0px 0px 1rem;" align="initial"><strong style="font-weight: 600; margin-top: 0px;">Testing:</strong> <code style="font-size: 90%; color: #18171d; word-wrap: break-word; background-color: #ececef; border-radius: .25rem; font-weight: inherit; overflow-wrap: break-word; white-space: break-spaces; font-family: "GitLab Mono", "JetBrains Mono", "Menlo", "DejaVu Sans Mono", "Liberation Mono", "Consolas", "Ubuntu Mono", "Courier New", "andale mono", "lucida console", monospace; font-variant-ligatures: none; word-break: keep-all; padding: 0.125rem 0.25rem;">riscv/esp32c3db</code> and its samples build with no warnings. On ESP32-C3 hardware, a WiFi application that runs for well over 1.5 s now finishes and associates with a WPA2 access point. QEMU models neither watchdog, so the testsuite can't catch this.</p>
<p dir="auto" style="color: #3a383f; margin: 0px;" align="initial">Assisted-by: Claude Opus 5 (1M context) <a href="mailto:noreply@anthropic.com" style="margin-top: 0px;">noreply@anthropic.com</a></p>
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