Add board-info command support in Secure Download Mode (#838)

* Cut off the write_bin part from original #832

* Changelog entry

* Akela missed...

* Dumb

* Address reviews

CHANGELOG.md

@@ -234,6 +234,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Make the default flashing frequency target specific (#389)
 - Add note about permissions on Linux (#391)
 - Add a diagnostic to tell the user about the partition table format (#397)
+- Add `board-info` command support in Secure Download Mode (#838)
 
 ### Fixed
 

espflash/src/cli/mod.rs

@@ -575,17 +575,21 @@ pub fn parse_chip_rev(chip_rev: &str) -> Result<u16> {
 /// Print information about a chip
 pub fn print_board_info(flasher: &mut Flasher) -> Result<()> {
     let info = flasher.device_info()?;
-
     print!("Chip type:         {}", info.chip);
+
     if let Some((major, minor)) = info.revision {
         println!(" (revision v{major}.{minor})");
     } else {
         println!();
     }
+
     println!("Crystal frequency: {}", info.crystal_frequency);
     println!("Flash size:        {}", info.flash_size);
     println!("Features:          {}", info.features.join(", "));
-    println!("MAC address:       {}", info.mac_address);
+
+    if let Some(mac) = info.mac_address {
+        println!("MAC address:       {}", mac);
+    }
 
     Ok(())
 }

espflash/src/connection/mod.rs

@@ -124,6 +124,7 @@ pub struct Connection {
     decoder: SlipDecoder,
     after_operation: ResetAfterOperation,
     before_operation: ResetBeforeOperation,
+    pub(crate) secure_download_mode: bool,
 }
 
 impl Connection {
@@ -139,6 +140,7 @@ impl Connection {
             decoder: SlipDecoder::new(),
             after_operation,
             before_operation,
+            secure_download_mode: false,
         }
     }
 
@@ -449,6 +451,7 @@ impl Connection {
                 // - https://docs.espressif.com/projects/esptool/en/latest/esp32/advanced-topics/serial-protocol.html?highlight=md5#response-packet
                 // - https://docs.espressif.com/projects/esptool/en/latest/esp32/advanced-topics/serial-protocol.html?highlight=md5#status-bytes
                 // - https://docs.espressif.com/projects/esptool/en/latest/esp32/advanced-topics/serial-protocol.html?highlight=md5#verifying-uploaded-data
+
                 let status_len = if response.len() == 10 || response.len() == 26 {
                     2
                 } else {
@@ -483,8 +486,8 @@ impl Connection {
                     return_op: response[1],
                     return_length: u16::from_le_bytes(response[2..][..2].try_into().unwrap()),
                     value,
-                    error: response[response.len() - status_len],
-                    status: response[response.len() - status_len + 1],
+                    error: response[response.len() - status_len + 1],
+                    status: response[response.len() - status_len],
                 };
 
                 Ok(Some(header))
@@ -524,11 +527,10 @@ impl Connection {
     pub fn command(&mut self, command: Command<'_>) -> Result<CommandResponseValue, Error> {
         let ty = command.command_type();
         self.write_command(command).for_command(ty)?;
-
         for _ in 0..100 {
             match self.read_response().for_command(ty)? {
                 Some(response) if response.return_op == ty as u8 => {
-                    return if response.error != 0 {
+                    return if response.status != 0 {
                         let _error = self.flush();
                         Err(Error::RomError(RomError::new(
                             command.command_type(),

espflash/src/flasher/mod.rs

@@ -634,7 +634,7 @@ pub struct DeviceInfo {
     /// Device features
     pub features: Vec<String>,
     /// MAC address
-    pub mac_address: String,
+    pub mac_address: Option<String>,
 }
 
 /// Connect to and flash a target device
@@ -710,14 +710,19 @@ impl Flasher {
             return Ok(flasher);
         }
 
-        // Load flash stub if enabled
-        if use_stub {
-            info!("Using flash stub");
-            flasher.load_stub()?;
+        if !flasher.connection.secure_download_mode {
+            // Load flash stub if enabled.
+            if use_stub {
+                info!("Using flash stub");
+                flasher.load_stub()?;
+            }
+            // Flash size autodetection doesn't work in Secure Download Mode.
+            flasher.spi_autodetect()?;
+        } else if use_stub {
+            warn!("Stub is not supported in Secure Download Mode, setting --no-stub");
+            flasher.use_stub = false;
         }
 
-        flasher.spi_autodetect()?;
-
         // Now that we have established a connection and detected the chip and flash
         // size, we can set the baud rate of the connection to the configured value.
         if let Some(baud) = speed {
@@ -985,14 +990,21 @@ impl Flasher {
         let chip = self.chip();
         let target = chip.into_target();
 
-        let revision = Some(target.chip_revision(self.connection())?);
+        // chip_revision reads from efuse, which is not possible in Secure Download Mode
+        let revision = (!self.connection.secure_download_mode)
+            .then(|| target.chip_revision(self.connection()))
+            .transpose()?;
+
         let crystal_frequency = target.crystal_freq(self.connection())?;
         let features = target
             .chip_features(self.connection())?
             .iter()
             .map(|s| s.to_string())
             .collect::<Vec<_>>();
-        let mac_address = target.mac_address(self.connection())?;
+
+        let mac_address = (!self.connection.secure_download_mode)
+            .then(|| target.mac_address(self.connection()))
+            .transpose()?;
 
         let info = DeviceInfo {
             chip,
@@ -1099,13 +1111,23 @@ impl Flasher {
         segments: &[Segment<'_>],
         mut progress: Option<&mut dyn ProgressCallbacks>,
     ) -> Result<(), Error> {
+        if self.connection.secure_download_mode {
+            return Err(Error::UnsupportedFeature {
+                chip: self.chip,
+                feature: "writing binaries in Secure Download Mode currently".into(),
+            });
+        }
+
         let mut target = self
             .chip
             .flash_target(self.spi_params, self.use_stub, false, false);
+
         target.begin(&mut self.connection).flashing()?;
+
         for segment in segments {
             target.write_segment(&mut self.connection, segment.borrow(), &mut progress)?;
         }
+
         target.finish(&mut self.connection, true).flashing()?;
 
         Ok(())