Fix ota, use MMU to determine running partition, use RMW wrapper for ota_data partition (littelfs handles this internally, so it was no problem prior)

Software/MainBoard/rust/src/fat_error.rs

@@ -52,6 +52,7 @@ pub enum FatError {
     SpawnError {
         error: SpawnError,
     },
+    OTAError,
     PartitionError {
         error: esp_bootloader_esp_idf::partitions::Error,
     },
@@ -106,6 +107,9 @@ impl fmt::Display for FatError {
             }
             FatError::SNTPError { error } => write!(f, "SNTPError {error:?}"),
             FatError::BMSError { error } => write!(f, "BMSError, {error}"),
+            FatError::OTAError => {
+                write!(f, "OTA missing partition")
+            }
         }
     }
 }
@@ -323,13 +327,12 @@ impl From<sntpc::Error> for FatError {
     }
 }
 
-
-impl From<BmsProtocolError> for FatError{
+impl From<BmsProtocolError> for FatError {
     fn from(value: BmsProtocolError) -> Self {
         match value {
-            BmsProtocolError::I2cCommunicationError => {
-                FatError::String{error: "I2C communication error".to_string()}
-            }
+            BmsProtocolError::I2cCommunicationError => FatError::String {
+                error: "I2C communication error".to_string(),
+            },
         }
     }
-}
+}