boot: zephyr: Fix IO-based entrance method

If a device uses RESETINFO, than there are some bits set in the
resetinfo, even for reboots that should allow to interpret and
enter the device recovery.
That way it is possible to recover a device through serial recovery if
the main application resets due to i.e. watchdog.

Signed-off-by: Tomasz Chyrowicz <[email protected]>

Author: tomchy

boot/zephyr/include/io/io.h

@@ -67,6 +67,45 @@ static inline bool io_boot_skip_serial_recovery()
 {
     uint32_t rr = nrfx_reset_reason_get();
 
+#ifdef NRF_RESETINFO
+    /* The following reset reasons should allow to enter firmware recovery or
+     * loader through an IO state.
+     */
+    const uint32_t allowed_reset_reasons = (
+        /* Reset from power on reset (reset reason POR or BOR). */
+        NRFX_RESET_REASON_POR_MASK
+#ifdef RESETINFO_RESETREAS_GLOBAL_RESETPOR_Msk
+        /* Reset from power on reset (reset reason other than POR or BOR). */
+        | RESETINFO_RESETREAS_GLOBAL_RESETPOR_Msk
+#endif
+        /* Reset from pin reset is not masked: it always enables the io-based recovery. */
+        /* Reset from the watchdog timer. */
+        | NRFX_RESET_REASON_DOG_MASK
+        /* Reset from CTRL-AP. */
+        | NRFX_RESET_REASON_CTRLAP_MASK
+        /* Reset due to secure domain system reset request. */
+        | NRFX_RESET_REASON_SREQ_MASK
+        /* Reset due to secure domain watchdog 0 timer. */
+        | NRFX_RESET_REASON_SECWDT0_MASK
+        /* Reset due to secure domain watchdog 1 timer. */
+        | NRFX_RESET_REASON_SECWDT1_MASK
+        /* Reset due to secure domain lockup. */
+        | NRFX_RESET_REASON_LOCKUP_MASK
+#if NRF_RESETINFO_HAS_LOCAL_WDT
+        /* Reset from the local watchdog timer 0. */
+        | NRFX_RESET_REASON_LOCAL_DOG0_MASK
+        /* Reset from the local watchdog timer 1. */
+        | NRFX_RESET_REASON_LOCAL_DOG1_MASK
+#endif
+        /* Reset from the local soft reset request. */
+        | NRFX_RESET_REASON_LOCAL_SREQ_MASK
+        /* Reset from local CPU lockup. */
+        | NRFX_RESET_REASON_LOCAL_LOCKUP_MASK
+    );
+
+    rr &= ~allowed_reset_reasons;
+#endif /* NRF_RESETINFO */
+
     return !(rr == 0 || (rr & NRFX_RESET_REASON_RESETPIN_MASK));
 }
 #else