Add --target-app-partition argument to flash command. (For #459)

# Conflicts:
#	cargo-espflash/src/main.rs
#	espflash/src/bin/espflash.rs
#	espflash/src/cli/mod.rs
#	espflash/src/flasher/mod.rs
#	espflash/src/image_format/idf_bootloader.rs
#	espflash/src/targets/esp32.rs
#	espflash/src/targets/esp32c2.rs
#	espflash/src/targets/esp32c3.rs
#	espflash/src/targets/esp32c6.rs
#	espflash/src/targets/esp32h2.rs
#	espflash/src/targets/esp32s2.rs
#	espflash/src/targets/esp32s3.rs
#	espflash/src/targets/esp8266.rs
#	espflash/src/targets/mod.rs

cargo-espflash/src/main.rs

@@ -265,6 +265,7 @@ fn flash(args: FlashArgs, config: &Config) -> Result<()> {
             &elf_data,
             bootloader,
             partition_table,
+            args.flash_args.target_app_partition,
             args.flash_args.format.or(metadata.format),
             args.build_args.flash_config_args.flash_mode,
             args.build_args.flash_config_args.flash_size,
@@ -505,6 +506,7 @@ fn save_image(args: SaveImageArgs) -> Result<()> {
         args.save_image_args.merge,
         bootloader,
         partition_table,
+        args.save_image_args.target_app_partition,
         args.save_image_args.skip_padding,
     )?;
 

espflash/src/bin/espflash.rs

@@ -206,6 +206,7 @@ fn flash(args: FlashArgs, config: &Config) -> Result<()> {
             &elf_data,
             bootloader,
             partition_table,
+            args.flash_args.target_app_partition,
             args.flash_args.format,
             args.flash_config_args.flash_mode,
             args.flash_config_args.flash_size,
@@ -267,6 +268,7 @@ fn save_image(args: SaveImageArgs) -> Result<()> {
         args.save_image_args.merge,
         args.save_image_args.bootloader,
         args.save_image_args.partition_table,
+        args.save_image_args.target_app_partition,
         args.save_image_args.skip_padding,
     )?;
 

espflash/src/cli/mod.rs

@@ -106,6 +106,9 @@ pub struct FlashArgs {
     /// Path to a CSV file containing partition table
     #[arg(long, value_name = "FILE")]
     pub partition_table: Option<PathBuf>,
+    /// Label of target app partition
+    #[arg(long, value_name = "LABEL")]
+    pub target_app_partition: Option<String>,
     /// Load the application to RAM instead of Flash
     #[arg(long)]
     pub ram: bool,
@@ -146,6 +149,9 @@ pub struct SaveImageArgs {
     /// Custom partition table for merging
     #[arg(long, short = 'T', requires = "merge", value_name = "FILE")]
     pub partition_table: Option<PathBuf>,
+    /// Label of target app partition
+    #[arg(long, value_name = "LABEL")]
+    pub target_app_partition: Option<String>,
     /// Don't pad the image to the flash size
     #[arg(long, short = 'P', requires = "merge")]
     pub skip_padding: bool,
@@ -289,6 +295,7 @@ pub fn save_elf_as_image(
     merge: bool,
     bootloader_path: Option<PathBuf>,
     partition_table_path: Option<PathBuf>,
+    target_app_partition: Option<String>,
     skip_padding: bool,
 ) -> Result<()> {
     let image = ElfFirmwareImage::try_from(elf_data)?;
@@ -330,6 +337,7 @@ pub fn save_elf_as_image(
             &image,
             bootloader,
             partition_table,
+            target_app_partition,
             image_format,
             None,
             flash_mode,
@@ -370,6 +378,7 @@ pub fn save_elf_as_image(
             &image,
             None,
             None,
+            None,
             image_format,
             None,
             flash_mode,
@@ -451,6 +460,7 @@ pub fn flash_elf_image(
     elf_data: &[u8],
     bootloader: Option<&Path>,
     partition_table: Option<PartitionTable>,
+    target_app_partition: Option<String>,
     image_format: Option<ImageFormatKind>,
     flash_mode: Option<FlashMode>,
     flash_size: Option<FlashSize>,
@@ -473,6 +483,7 @@ pub fn flash_elf_image(
         elf_data,
         bootloader,
         partition_table,
+        target_app_partition,
         image_format,
         flash_mode,
         flash_size,

espflash/src/error.rs

@@ -22,6 +22,10 @@ use crate::{
 #[derive(Debug, Diagnostic, Error)]
 #[non_exhaustive]
 pub enum Error {
+    #[error("App partition not found")]
+    #[diagnostic(code(espflash::app_partition_not_found))]
+    AppPartitionNotFound,
+
     #[error("Operation was cancelled by the user")]
     #[diagnostic(code(espflash::cancelled))]
     Cancelled,

espflash/src/flasher/mod.rs

@@ -722,6 +722,7 @@ impl Flasher {
         elf_data: &[u8],
         bootloader: Option<Vec<u8>>,
         partition_table: Option<PartitionTable>,
+        target_app_partition: Option<String>,
         image_format: Option<ImageFormatKind>,
         flash_mode: Option<FlashMode>,
         flash_size: Option<FlashSize>,
@@ -749,6 +750,7 @@ impl Flasher {
             &image,
             bootloader,
             partition_table,
+            target_app_partition,
             image_format,
             chip_revision,
             flash_mode,
@@ -797,6 +799,7 @@ impl Flasher {
         elf_data: &[u8],
         bootloader: Option<Vec<u8>>,
         partition_table: Option<PartitionTable>,
+        target_app_partition: Option<String>,
         flash_mode: Option<FlashMode>,
         flash_size: Option<FlashSize>,
         flash_freq: Option<FlashFrequency>,
@@ -806,6 +809,7 @@ impl Flasher {
             elf_data,
             bootloader,
             partition_table,
+            target_app_partition,
             None,
             flash_mode,
             flash_size,

espflash/src/image_format/idf_bootloader.rs

@@ -1,7 +1,7 @@
 use std::{borrow::Cow, io::Write, iter::once, mem::size_of};
 
 use bytemuck::{bytes_of, from_bytes};
-use esp_idf_part::{PartitionTable, Type};
+use esp_idf_part::{Partition, PartitionTable, Type};
 use sha2::{Digest, Sha256};
 
 use crate::{
@@ -35,6 +35,7 @@ impl<'a> IdfBootloaderFormat<'a> {
         chip: Chip,
         params: Esp32Params,
         partition_table: Option<PartitionTable>,
+        target_app_partition: Option<String>,
         bootloader: Option<Vec<u8>>,
         flash_mode: Option<FlashMode>,
         flash_size: Option<FlashSize>,
@@ -144,17 +145,27 @@ impl<'a> IdfBootloaderFormat<'a> {
         let hash = hasher.finalize();
         data.write_all(&hash)?;
 
-        // The default partition table contains the "factory" partition, and if a user
-        // provides a partition table via command-line then the validation step confirms
-        // that at least one "app" partition is present. We prefer the "factory"
-        // partition, and use any available "app" partitions if not present.
-        let factory_partition = partition_table
-            .find("factory")
-            .or_else(|| partition_table.find_by_type(Type::App))
-            .unwrap();
+        let target_app_partition: &Partition =
+        // Use the target app partition if provided
+        if let Some(target_partition) = target_app_partition {
+            partition_table
+                .find(&target_partition)
+                .ok_or(Error::AppPartitionNotFound)?
+        } else {
+
+            // The default partition table contains the "factory" partition, and if a user
+            // provides a partition table via command-line then the validation step confirms
+            // that at least one "app" partition is present. We prefer the "factory"
+            // partition, and use any available "app" partitions if not present.
+
+            partition_table
+                .find("factory")
+                .or_else(|| partition_table.find_by_type(Type::App))
+                .ok_or(Error::AppPartitionNotFound)?
+        };
 
         let app_size = data.len() as u32;
-        let part_size = factory_partition.size();
+        let part_size = target_app_partition.size();
 
         // The size of the application must not exceed the size of the factory
         // partition.
@@ -163,7 +174,7 @@ impl<'a> IdfBootloaderFormat<'a> {
         }
 
         let flash_segment = RomSegment {
-            addr: factory_partition.offset(),
+            addr: target_app_partition.offset(),
             data: Cow::Owned(data),
         };
 

espflash/src/targets/esp32.rs

@@ -155,6 +155,7 @@ impl Target for Esp32 {
         image: &'a dyn FirmwareImage<'a>,
         bootloader: Option<Vec<u8>>,
         partition_table: Option<PartitionTable>,
+        target_app_partition: Option<String>,
         image_format: Option<ImageFormatKind>,
         _chip_revision: Option<(u32, u32)>,
         flash_mode: Option<FlashMode>,
@@ -169,6 +170,7 @@ impl Target for Esp32 {
                 Chip::Esp32,
                 PARAMS,
                 partition_table,
+                target_app_partition,
                 bootloader,
                 flash_mode,
                 flash_size,

espflash/src/targets/esp32c2.rs

@@ -89,6 +89,7 @@ impl Target for Esp32c2 {
         image: &'a dyn FirmwareImage<'a>,
         bootloader: Option<Vec<u8>>,
         partition_table: Option<PartitionTable>,
+        target_app_partition: Option<String>,
         image_format: Option<ImageFormatKind>,
         _chip_revision: Option<(u32, u32)>,
         flash_mode: Option<FlashMode>,
@@ -103,6 +104,7 @@ impl Target for Esp32c2 {
                 Chip::Esp32c2,
                 PARAMS,
                 partition_table,
+                target_app_partition,
                 bootloader,
                 flash_mode,
                 flash_size,

espflash/src/targets/esp32c3.rs

@@ -76,6 +76,7 @@ impl Target for Esp32c3 {
         image: &'a dyn FirmwareImage<'a>,
         bootloader: Option<Vec<u8>>,
         partition_table: Option<PartitionTable>,
+        target_app_partition: Option<String>,
         image_format: Option<ImageFormatKind>,
         chip_revision: Option<(u32, u32)>,
         flash_mode: Option<FlashMode>,
@@ -90,6 +91,7 @@ impl Target for Esp32c3 {
                 Chip::Esp32c3,
                 PARAMS,
                 partition_table,
+                target_app_partition,
                 bootloader,
                 flash_mode,
                 flash_size,

espflash/src/targets/esp32c6.rs

@@ -73,6 +73,7 @@ impl Target for Esp32c6 {
         image: &'a dyn FirmwareImage<'a>,
         bootloader: Option<Vec<u8>>,
         partition_table: Option<PartitionTable>,
+        target_app_partition: Option<String>,
         image_format: Option<ImageFormatKind>,
         _chip_revision: Option<(u32, u32)>,
         flash_mode: Option<FlashMode>,
@@ -87,6 +88,7 @@ impl Target for Esp32c6 {
                 Chip::Esp32c6,
                 PARAMS,
                 partition_table,
+                target_app_partition,
                 bootloader,
                 flash_mode,
                 flash_size,

espflash/src/targets/esp32h2.rs

@@ -81,6 +81,7 @@ impl Target for Esp32h2 {
         image: &'a dyn FirmwareImage<'a>,
         bootloader: Option<Vec<u8>>,
         partition_table: Option<PartitionTable>,
+        target_app_partition: Option<String>,
         image_format: Option<ImageFormatKind>,
         _chip_revision: Option<(u32, u32)>,
         flash_mode: Option<FlashMode>,
@@ -95,6 +96,7 @@ impl Target for Esp32h2 {
                 Chip::Esp32h2,
                 PARAMS,
                 partition_table,
+                target_app_partition,
                 bootloader,
                 flash_mode,
                 flash_size,

espflash/src/targets/esp32s2.rs

@@ -141,6 +141,7 @@ impl Target for Esp32s2 {
         image: &'a dyn FirmwareImage<'a>,
         bootloader: Option<Vec<u8>>,
         partition_table: Option<PartitionTable>,
+        target_app_partition: Option<String>,
         image_format: Option<ImageFormatKind>,
         _chip_revision: Option<(u32, u32)>,
         flash_mode: Option<FlashMode>,
@@ -155,6 +156,7 @@ impl Target for Esp32s2 {
                 Chip::Esp32s2,
                 PARAMS,
                 partition_table,
+                target_app_partition,
                 bootloader,
                 flash_mode,
                 flash_size,

espflash/src/targets/esp32s3.rs

@@ -95,6 +95,7 @@ impl Target for Esp32s3 {
         image: &'a dyn FirmwareImage<'a>,
         bootloader: Option<Vec<u8>>,
         partition_table: Option<PartitionTable>,
+        target_app_partition: Option<String>,
         image_format: Option<ImageFormatKind>,
         _chip_revision: Option<(u32, u32)>,
         flash_mode: Option<FlashMode>,
@@ -109,6 +110,7 @@ impl Target for Esp32s3 {
                 Chip::Esp32s3,
                 PARAMS,
                 partition_table,
+                target_app_partition,
                 bootloader,
                 flash_mode,
                 flash_size,

espflash/src/targets/esp8266.rs

@@ -74,6 +74,7 @@ impl Target for Esp8266 {
         image: &'a dyn FirmwareImage<'a>,
         _bootloader: Option<Vec<u8>>,
         _partition_table: Option<PartitionTable>,
+        _target_app_partition: Option<String>,
         image_format: Option<ImageFormatKind>,
         _chip_revision: Option<(u32, u32)>,
         flash_mode: Option<FlashMode>,

espflash/src/targets/mod.rs

@@ -297,6 +297,7 @@ pub trait Target: ReadEFuse {
         image: &'a dyn FirmwareImage<'a>,
         bootloader: Option<Vec<u8>>,
         partition_table: Option<PartitionTable>,
+        target_app_partition: Option<String>,
         image_format: Option<ImageFormatKind>,
         chip_revision: Option<(u32, u32)>,
         flash_mode: Option<FlashMode>,