diff --git a/README.md b/README.md
index 02e68ed..434bb4d 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ direnv allow
 When you enter the devShell (via `direnv allow` or `nix develop`), the following happens automatically:
 
 ✓ **Git Repository**: Initializes `.git` if not present
-✓ **Rust Targets**: Automatically adds common embedded Rust targets (ARM Cortex-M, RISC-V)
+✓ **Rust Targets**: Automatically adds the RP2040 (Pico W) target: `thumbv6m-none-eabi`
 ✓ **Cargo Paths**: Sets up `$HOME/.cargo/bin` in PATH for cargo-installed binaries
 ✓ **Welcome Banner**: Displays available tools and quick commands
 
@@ -35,16 +35,11 @@ cargo build
 
 ## Embedded Rust Support
 
-The devShell automatically installs common embedded Rust targets via `rustup`:
+The devShell automatically installs the Raspberry Pi Pico W target via `rustup`:
 
 | Target | Platform | Use Case |
 |--------|----------|----------|
-| `thumbv6m-none-eabi` | ARM Cortex-M0/M0+ | RP2040 (Pico) |
-| `thumbv7em-none-eabihf` | ARM Cortex-M4F/M7F | STM32, nRF52840 |
-| `riscv32imc-unknown-none-elf` | RISC-V 32-bit | ESP32-C3 (basic) |
-| `riscv32imac-unknown-none-elf` | RISC-V 32-bit (atomic) | ESP32-C3 (advanced) |
-
-**Note:** ESP32 Xtensa targets require espup or custom toolchains (see [esp-rs](https://github.com/esp-rs)).
+| `thumbv6m-none-eabi` | ARM Cortex-M0/M0+ | RP2040 (Pico W) |
 
 ## Flatpak Packaging
 
@@ -84,14 +79,11 @@ flatpak run org.example.rustdevshell
 | **rustfmt** | Rust code formatter |
 | **rust-analyzer** | Language server for IDE integration |
 | **rust-src** | Rust source code (for tools like rust-analyzer) |
-| **probe-rs** | Embedded debugger/flasher for ARM targets |
-| **espflash** | Flashing tool for ESP32 boards |
-| **openocd** | JTAG/SWD debugger for ARM and other targets |
+| **probe-rs** | Embedded debugger/flasher |
+| **openocd** | JTAG/SWD debugger |
 | **minicom** | Serial terminal for device output |
 | **elf2uf2-rs** | Convert ELF to UF2 format (RP2040) |
 | **picotool** | Pico-specific firmware operations |
-| **avrdude** | AVR microcontroller programmer |
-| **ravedude** | Rapid AVR development utility |
 
 ## Testing & Development Features
 
@@ -114,7 +106,7 @@ cargo clippy
 cargo fmt
 
 # Build for embedded target
-cargo build --target thumbv7em-none-eabihf --release
+cargo build --target thumbv6m-none-eabi --release
 ```
 
 ## Project Layout
diff --git a/flake.nix b/flake.nix
index 583ccfd..3d61f1e 100644
--- a/flake.nix
+++ b/flake.nix
@@ -73,16 +73,11 @@
               rustup
               # Embedded Rust tooling
               probe-rs-tools
-              espflash
               openocd
               minicom
               # RP2040 UF2 workflows
               elf2uf2-rs
               picotool
-              avrdude
-              pkgsCross.avr.buildPackages.libc
-              pkgsCross.avr.buildPackages.gcc
-              ravedude
               pre-commit
             ];
 
@@ -102,15 +97,11 @@
               export PATH="$HOME/.cargo/bin:$PATH"
 
               if command -v rustup >/dev/null 2>&1; then
-                echo "Ensuring common embedded Rust targets are available (idempotent)..."
+                echo "Ensuring Raspberry Pi Pico W target is available (idempotent)..."
                 rustup target add thumbv6m-none-eabi       >/dev/null 2>&1 || true  # Cortex-M0/M0+ (RP2040)
-                rustup target add thumbv7em-none-eabihf    >/dev/null 2>&1 || true  # Cortex-M4F/M7F (many STM32/nRF52)
-                rustup target add riscv32imc-unknown-none-elf >/dev/null 2>&1 || true
-                rustup target add riscv32imac-unknown-none-elf >/dev/null 2>&1 || true  # ESP32-C3 class
-                echo "Note: ESP32 Xtensa targets require espup/custom toolchains (see esp-rs)."
               fi
               echo "[rust-template] Welcome to the Rust dev shell!"
-              echo "Tools: cargo, rustc, clippy, rustfmt, rust-analyzer, probe-rs, espflash, openocd, minicom, elf2uf2-rs, picotool, avrdude, ravedude"
+              echo "Tools: cargo, rustc, clippy, rustfmt, rust-analyzer, probe-rs, openocd, minicom, elf2uf2-rs, picotool"
               echo "Run 'cargo build' to build, or 'nix run .#dev-helper' for a tool summary."
               echo "See README.md for usage."
             '';