stm32/mboot: Default to direct jump when DFU timeout enabled.

When MBOOT_ENABLE_DFU_TIMEOUT is enabled, default
MBOOT_LEAVE_BOOTLOADER_VIA_RESET to 0 (direct jump) instead of 1 (reset).

Without this, timeout expiration causes NVIC_SystemReset() which re-enters
the bootloader, creating a reset loop instead of booting the application.

Signed-off-by: Andrew Leech <[email protected]>

Author: pi-anl

ports/stm32/mboot/main.c

@@ -44,9 +44,14 @@
 #include "xspi.h"
 
 // Whether the bootloader will leave via reset, or direct jump to the application.
+// When DFU timeout is enabled, default to direct jump to avoid reset loops.
 #ifndef MBOOT_LEAVE_BOOTLOADER_VIA_RESET
+#if MBOOT_ENABLE_DFU_TIMEOUT
+#define MBOOT_LEAVE_BOOTLOADER_VIA_RESET (0)
+#else
 #define MBOOT_LEAVE_BOOTLOADER_VIA_RESET (1)
 #endif
+#endif
 
 // This option selects whether to use explicit polling or IRQs for USB events.
 // In some test cases polling mode can run slightly faster, but it uses more power.