add generic bootloader feature

.github/workflows/build.yml

@@ -52,8 +52,17 @@ jobs:
           args: --release --target=thumbv6m-none-eabi
       - name: Pack firmware
         run: elf2uf2-rs target/thumbv6m-none-eabi/release/ula ula_${{ github.ref_name }}.uf2
+      - name: Build generic bootloader firmware
+        uses: actions-rs/cargo@v1
+        with:
+          command: build
+          args: --release --target=thumbv6m-none-eabi --features=generic-bootloader
+      - name: Pack generic bootloader firmware
+        run: elf2uf2-rs target/thumbv6m-none-eabi/release/ula ula_${{ github.ref_name }}_generic.uf2
       - name: Release
         uses: softprops/action-gh-release@v1
         if: startsWith(github.ref, 'refs/tags/')
         with:
-          files: ula_${{ github.ref_name }}.uf2
+          files: |
+            ula_${{ github.ref_name }}.uf2
+            ula_${{ github.ref_name }}_generic.uf2

Cargo.toml

@@ -23,6 +23,10 @@ cortex-m = "0.7.7"
 panic-probe = "0.3.1"
 embedded-hal = "0.2.7"
 
+[features]
+default = []
+generic-bootloader = []
+
 [profile.dev]
 codegen-units = 1
 debug = 2

src/main.rs

@@ -31,11 +31,18 @@ pub const SAMPLE_RATE: usize = 100_000_000;
 pub const PIN_BASE: usize = 0;
 pub const XTAL_FREQ_HZ: u32 = 12_000_000_u32;
 
-#[link_section = ".boot2"]
-#[no_mangle]
+#[cfg(not(feature = "generic-bootloader"))]
 #[used]
+#[no_mangle]
+#[link_section = ".boot2"]
 pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
 
+#[cfg(feature = "generic-bootloader")]
+#[used]
+#[no_mangle]
+#[link_section = ".boot2"]
+pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_GENERIC_03H;
+
 #[rtic::app(device = pac, peripherals = true)]
 mod app {
     use super::*;