Route sources of panics to the crate's fmt macros

embassy-boot-stm32/src/lib.rs

@@ -20,7 +20,13 @@ impl BootLoader {
     pub fn prepare<ACTIVE: NorFlash, DFU: NorFlash, STATE: NorFlash, const BUFFER_SIZE: usize>(
         config: BootLoaderConfig<ACTIVE, DFU, STATE>,
     ) -> Self {
-        Self::try_prepare::<ACTIVE, DFU, STATE, BUFFER_SIZE>(config).expect("Boot prepare error")
+        if let Ok(loader) = Self::try_prepare::<ACTIVE, DFU, STATE, BUFFER_SIZE>(config) {
+            loader
+        } else {
+            // Use explicit panic instead of .expect() to ensure this gets routed via defmt/etc.
+            // properly
+            panic!("Boot prepare error")
+        }
     }
 
     /// Inspect the bootloader state and perform actions required before booting, such as swapping firmware