feat: embassy-boot for rp2040

Add embassy-boot support for RP2040, with examples for the Raspberry Pi
Pico.

Co-authored-by: Mathias Koch <mk@blackbird.online>

examples/boot/bootloader/rp/Cargo.toml

@@ -0,0 +1,29 @@
+[package]
+edition = "2021"
+name = "rp-bootloader-example"
+version = "0.1.0"
+description = "Example bootloader for RP2040 chips"
+license = "MIT OR Apache-2.0"
+
+[dependencies]
+defmt = { version = "0.3", optional = true }
+defmt-rtt = { version = "0.4", optional = true }
+
+embassy-rp = { path = "../../../../embassy-rp", default-features = false, features = ["nightly"] }
+embassy-boot-rp = { path = "../../../../embassy-boot/rp", default-features = false }
+cortex-m = { version = "0.7.6", features = ["critical-section-single-core"] }
+cortex-m-rt = { version = "0.7" }
+embedded-storage = "0.3.0"
+embedded-storage-async = "0.3.0"
+cfg-if = "1.0.0"
+
+[features]
+defmt = [
+    "dep:defmt",
+    "embassy-boot-rp/defmt",
+    "embassy-rp/defmt",
+]
+debug = ["defmt-rtt", "defmt"]
+
+[profile.release]
+debug = true