Make BSPs provide boot2 as a default feature (#153)

* Add boot2 feature. Add boot2 linkage into each BSP optional on feature

* Enable boot2 feature in BSPs by default. Remove boot2 decl from all BSP examples

* Add EXTERN in memory.x for BOOT2_FIRMWARE, rename bootloader static slice to BOOT2_FIRMWARE

* Update new examples and itsy_bitsy BSP to use boot2 feature

* Remove boot2 as a dev-dependency for the BSPs, no longer needed

* Add no_mangle BOOT2_FIRMWARE to adafruit_macropad

* Fix itsy-bitsy blinky - it wasn't using the BSP, so it didn't get BOOT2_FIRMWARE linked in

boards/adafruit_macropad/Cargo.toml

@@ -11,9 +11,12 @@ license = "MIT OR Apache-2.0"
 
 [dependencies]
 cortex-m = "0.7.2"
+rp2040-boot2 = { version = "0.2.0", optional = true }
 rp2040-hal = { path = "../../rp2040-hal", version = "0.3.0"}
 cortex-m-rt = { version = "0.7", optional = true }
 
 [features]
-default = ["rt"]
+default = ["rt", "boot2"]
+boot2 = ["rp2040-boot2"]
 rt = ["cortex-m-rt","rp2040-hal/rt"]
+

boards/adafruit_macropad/src/lib.rs

@@ -7,6 +7,16 @@ extern crate cortex_m_rt;
 #[cfg(feature = "rt")]
 pub use cortex_m_rt::entry;
 
+// Adafruit macropad uses W25Q64JVxQ flash chip. Should work with BOOT_LOADER_W25Q080 (untested)
+
+//// The linker will place this boot block at the start of our program image. We
+//// need this to help the ROM bootloader get our code up and running.
+#[cfg(feature = "boot2")]
+#[link_section = ".boot2"]
+#[no_mangle]
+#[used]
+pub static BOOT2_FIRMWARE: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
+
 pub use hal::pac;
 
 hal::bsp_pins!(

boards/feather_rp2040/Cargo.toml

@@ -11,6 +11,7 @@ license = "MIT OR Apache-2.0"
 
 [dependencies]
 cortex-m = "0.7.2"
+rp2040-boot2 = { version = "0.2.0", optional = true }
 rp2040-hal = { path = "../../rp2040-hal", version = "0.3.0"}
 cortex-m-rt = { version = "0.7", optional = true }
 embedded-time = "0.12.0"
@@ -18,12 +19,12 @@ embedded-time = "0.12.0"
 [dev-dependencies]
 panic-halt= "0.2.0"
 embedded-hal ="0.2.5"
-rp2040-boot2 = "0.2"
 nb = "1.0.0"
 smart-leds = "0.3.0"
 pio = { git = "https://github.com/rp-rs/pio-rs.git", branch = "main" }
 ws2812-pio = { git = "https://github.com/ithinuel/ws2812-pio-rs", rev = "7a11616f994025f5c99f28b283d2b25d60d46a43" }
 
 [features]
-default = ["rt"]
+default = ["boot2", "rt"]
+boot2 = ["rp2040-boot2"]
 rt = ["cortex-m-rt","rp2040-hal/rt"]

boards/feather_rp2040/examples/feather_blinky.rs

@@ -17,9 +17,6 @@ use feather_rp2040::{
     Pins, XOSC_CRYSTAL_FREQ,
 };
 use panic_halt as _;
-#[link_section = ".boot2"]
-#[used]
-pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_GD25Q64CS;
 
 #[entry]
 fn main() -> ! {

boards/feather_rp2040/examples/feather_neopixel_rainbow.rs

@@ -24,9 +24,6 @@ use panic_halt as _;
 use rp2040_hal::pio::PIOExt;
 use smart_leds::{brightness, SmartLedsWrite, RGB8};
 use ws2812_pio::Ws2812;
-#[link_section = ".boot2"]
-#[used]
-pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_GD25Q64CS;
 
 #[entry]
 fn main() -> ! {

boards/feather_rp2040/src/lib.rs

@@ -7,6 +7,14 @@ extern crate cortex_m_rt;
 #[cfg(feature = "rt")]
 pub use cortex_m_rt::entry;
 
+//// The linker will place this boot block at the start of our program image. We
+//// need this to help the ROM bootloader get our code up and running.
+#[cfg(feature = "boot2")]
+#[link_section = ".boot2"]
+#[no_mangle]
+#[used]
+pub static BOOT2_FIRMWARE: [u8; 256] = rp2040_boot2::BOOT_LOADER_GD25Q64CS;
+
 pub use hal::pac;
 
 hal::bsp_pins!(

boards/itsy_bitsy_rp2040/Cargo.toml

@@ -11,6 +11,7 @@ license = "MIT OR Apache-2.0"
 
 [dependencies]
 cortex-m = "0.7.2"
+rp2040-boot2 = { version = "0.2.0", optional = true }
 rp2040-hal = { path = "../../rp2040-hal", version = "0.3.0"}
 cortex-m-rt = { version = "0.7", optional = true }
 embedded-time = "0.12.0"
@@ -18,12 +19,12 @@ embedded-time = "0.12.0"
 [dev-dependencies]
 panic-halt= "0.2.0"
 embedded-hal ="0.2.5"
-rp2040-boot2 = "0.2"
 smart-leds = "0.3"
 nb = "1.0.0"
 pio = { git = "https://github.com/rp-rs/pio-rs.git", branch = "main" }
 ws2812-pio = { git = "https://github.com/ithinuel/ws2812-pio-rs", rev = "7a11616f994025f5c99f28b283d2b25d60d46a43" }
 
 [features]
-default = ["rt"]
+default = ["rt", "boot2"]
+boot2 = ["rp2040-boot2"]
 rt = ["cortex-m-rt","rp2040-hal/rt"]

boards/itsy_bitsy_rp2040/examples/itsy_bitsy_blinky.rs

@@ -1,6 +1,6 @@
 //! # GPIO 'Blinky' Example
 //!
-//! This application demonstrates how to control a GPIO pin on the RP2040.
+//! Blinks the LED on a Adafruit itsy-bitsy RP2040 board
 //!
 //! It may need to be adapted to your particular board layout and/or pin assignment.
 //!
@@ -16,27 +16,21 @@ use cortex_m_rt::entry;
 // be linked)
 use panic_halt as _;
 
-// Alias for our HAL crate
-use rp2040_hal as hal;
-
-// A shorter alias for the Peripheral Access Crate, which provides low-level
-// register access
-use hal::pac;
-
 // Some traits we need
 use embedded_hal::digital::v2::OutputPin;
 use embedded_time::fixed_point::FixedPoint;
-use rp2040_hal::clocks::Clock;
 
-/// The linker will place this boot block at the start of our program image. We
+use itsy_bitsy_rp2040::{
-// need this to help the ROM bootloader get our code up and running.
+    hal::{
-#[link_section = ".boot2"]
+        clocks::{init_clocks_and_plls, Clock},
-#[used]
+        pac,
-pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
+        sio::Sio,
+        watchdog::Watchdog,
+    },
+    Pins, XOSC_CRYSTAL_FREQ,
+};
 
-/// External high-speed crystal on the Raspberry Pi Pico board is 12 MHz. Adjust
+use cortex_m::delay::Delay;
-/// if your board has a different frequency
-const XTAL_FREQ_HZ: u32 = 12_000_000u32;
 
 /// Entry point to our bare-metal application.
 ///
@@ -52,11 +46,11 @@ fn main() -> ! {
     let core = pac::CorePeripherals::take().unwrap();
 
     // Set up the watchdog driver - needed by the clock setup code
-    let mut watchdog = hal::watchdog::Watchdog::new(pac.WATCHDOG);
+    let mut watchdog = Watchdog::new(pac.WATCHDOG);
 
     // Configure the clocks
-    let clocks = hal::clocks::init_clocks_and_plls(
+    let clocks = init_clocks_and_plls(
-        XTAL_FREQ_HZ,
+        XOSC_CRYSTAL_FREQ,
         pac.XOSC,
         pac.CLOCKS,
         pac.PLL_SYS,
@@ -67,24 +61,21 @@ fn main() -> ! {
     .ok()
     .unwrap();
 
-    let mut delay = cortex_m::delay::Delay::new(core.SYST, clocks.system_clock.freq().integer());
+    let mut delay = Delay::new(core.SYST, clocks.system_clock.freq().integer());
 
     // The single-cycle I/O block controls our GPIO pins
-    let sio = hal::sio::Sio::new(pac.SIO);
+    let sio = Sio::new(pac.SIO);
 
-    // Set the pins to their default state
+    let pins = Pins::new(
-    let pins = hal::gpio::Pins::new(
         pac.IO_BANK0,
         pac.PADS_BANK0,
         sio.gpio_bank0,
         &mut pac.RESETS,
     );
+    let mut led_pin = pins.d13.into_push_pull_output();
 
-    // Configure GPIO25 as an output
-    let mut led_pin = pins.gpio11.into_push_pull_output();
     loop {
         led_pin.set_high().unwrap();
-        // TODO: Replace with proper 1s delays once we have clocks working
         delay.delay_ms(500);
         led_pin.set_low().unwrap();
         delay.delay_ms(500);

boards/itsy_bitsy_rp2040/examples/itsy_bitsy_rainbow.rs

@@ -22,10 +22,6 @@ use itsy_bitsy_rp2040::{
     Pins, XOSC_CRYSTAL_FREQ,
 };
 
-#[link_section = ".boot2"]
-#[used]
-pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
-
 #[entry]
 fn main() -> ! {
     let mut pac = pac::Peripherals::take().unwrap();

boards/itsy_bitsy_rp2040/src/lib.rs

@@ -7,6 +7,14 @@ extern crate cortex_m_rt;
 #[cfg(feature = "rt")]
 pub use cortex_m_rt::entry;
 
+//// The linker will place this boot block at the start of our program image. We
+//// need this to help the ROM bootloader get our code up and running.
+#[cfg(feature = "boot2")]
+#[link_section = ".boot2"]
+#[no_mangle]
+#[used]
+pub static BOOT2_FIRMWARE: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
+
 pub use hal::pac;
 
 hal::bsp_pins!(

boards/pico/Cargo.toml

@@ -11,6 +11,7 @@ license = "MIT OR Apache-2.0"
 
 [dependencies]
 cortex-m = "0.7.2"
+rp2040-boot2 = { version = "0.2.0", optional = true }
 rp2040-hal = { path = "../../rp2040-hal", version = "0.3.0"}
 cortex-m-rt = { version = "0.7", optional = true }
 embedded-time = "0.12.0"
@@ -36,12 +37,12 @@ optional = true
 panic-halt= "0.2.0"
 embedded-hal ="0.2.5"
 cortex-m-rtic = "0.6.0-alpha.5"
-rp2040-boot2 = "0.2"
 nb = "1.0"
 i2c-pio = { git = "https://github.com/ithinuel/i2c-pio-rs", rev = "fb6167d02b7fbc46a83f344f5242823bcd16e271" }
 
 [features]
-default = ["rt"]
+default = ["boot2", "rt"]
+boot2 = ["rp2040-boot2"]
 rt = ["cortex-m-rt","rp2040-hal/rt"]
 embassy-traits = ["futures", "embassy", "embassy_traits"]
 

boards/pico/examples/pico_blinky.rs

@@ -34,12 +34,6 @@ use pico::hal::pac;
 // higher-level drivers.
 use pico::hal;
 
-//// The linker will place this boot block at the start of our program image. We
-//// need this to help the ROM bootloader get our code up and running.
-#[link_section = ".boot2"]
-#[used]
-pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
-
 /// Entry point to our bare-metal application.
 ///
 /// The `#[entry]` macro ensures the Cortex-M start-up code calls this function

boards/pico/examples/pico_countdown_blinky.rs

@@ -33,10 +33,6 @@ use pico::hal::pac;
 // higher-level drivers.
 use pico::hal;
 
-#[link_section = ".boot2"]
-#[used]
-pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
-
 #[entry]
 fn main() -> ! {
     // Grab our singleton objects

boards/pico/examples/pico_gpio_in_out.rs

@@ -30,12 +30,6 @@ use pico::hal::pac;
 // higher-level drivers.
 use pico::hal;
 
-//// The linker will place this boot block at the start of our program image. We
-//// need this to help the ROM bootloader get our code up and running.
-#[link_section = ".boot2"]
-#[used]
-pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
-
 /// Entry point to our bare-metal application.
 ///
 /// The `#[entry]` macro ensures the Cortex-M start-up code calls this function

boards/pico/examples/pico_i2c_controller_peripheral/main.rs

@@ -41,10 +41,6 @@ use panic_halt as _;
 mod controller;
 mod peripheral;
 
-#[link_section = ".boot2"]
-#[used]
-pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
-
 const ADDRESS: u16 = 0x55;
 
 #[embassy::task]

boards/pico/examples/pico_i2c_pio.rs

@@ -38,12 +38,6 @@ use pico::hal::pac;
 // higher-level drivers.
 use pico::hal;
 
-//// The linker will place this boot block at the start of our program image. We
-//// need this to help the ROM bootloader get our code up and running.
-#[link_section = ".boot2"]
-#[used]
-pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
-
 /// Prints the temperature received from the sensor
 fn print_temperature(serial: &mut impl FmtWrite, temp: [u8; 2]) {
     let temp_i16 = i16::from_be_bytes(temp) >> 5;

boards/pico/examples/pico_pwm_blink.rs

@@ -34,12 +34,6 @@ use pico::hal::pac;
 // higher-level drivers.
 use pico::hal;
 
-//// The linker will place this boot block at the start of our program image. We
-//// need this to help the ROM bootloader get our code up and running.
-#[link_section = ".boot2"]
-#[used]
-pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
-
 // The minimum PWM value (i.e. LED brightness) we want
 const LOW: u16 = 0;
 

boards/pico/examples/pico_rtic.rs

@@ -4,10 +4,6 @@
 use panic_halt as _;
 use rp2040_hal as hal;
 
-#[link_section = ".boot2"]
-#[used]
-pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
-
 #[rtic::app(device = crate::hal::pac, peripherals = true)]
 mod app {
 

boards/pico/examples/pico_usb_serial.rs

@@ -33,12 +33,6 @@ use usb_device::{class_prelude::*, prelude::*};
 // USB Communications Class Device support
 use usbd_serial::SerialPort;
 
-//// The linker will place this boot block at the start of our program image. We
-//// need this to help the ROM bootloader get our code up and running.
-#[link_section = ".boot2"]
-#[used]
-pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
-
 /// Entry point to our bare-metal application.
 ///
 /// The `#[entry]` macro ensures the Cortex-M start-up code calls this function

boards/pico/examples/pico_usb_serial_interrupt.rs

@@ -45,12 +45,6 @@ use usb_device::{class_prelude::*, prelude::*};
 // USB Communications Class Device support
 use usbd_serial::SerialPort;
 
-//// The linker will place this boot block at the start of our program image. We
-//// need this to help the ROM bootloader get our code up and running.
-#[link_section = ".boot2"]
-#[used]
-pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
-
 /// The USB Device Driver (shared with the interrupt).
 static mut USB_DEVICE: Option<UsbDevice<hal::usb::UsbBus>> = None;
 

boards/pico/examples/pico_usb_twitchy_mouse.rs

@@ -44,12 +44,6 @@ use usbd_hid::descriptor::generator_prelude::*;
 use usbd_hid::descriptor::MouseReport;
 use usbd_hid::hid_class::HIDClass;
 
-//// The linker will place this boot block at the start of our program image. We
-//// need this to help the ROM bootloader get our code up and running.
-#[link_section = ".boot2"]
-#[used]
-pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
-
 /// The USB Device Driver (shared with the interrupt).
 static mut USB_DEVICE: Option<UsbDevice<hal::usb::UsbBus>> = None;
 

boards/pico/src/lib.rs

@@ -7,6 +7,14 @@ extern crate cortex_m_rt;
 #[cfg(feature = "rt")]
 pub use cortex_m_rt::entry;
 
+//// The linker will place this boot block at the start of our program image. We
+//// need this to help the ROM bootloader get our code up and running.
+#[cfg(feature = "boot2")]
+#[link_section = ".boot2"]
+#[no_mangle]
+#[used]
+pub static BOOT2_FIRMWARE: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
+
 pub use hal::pac;
 
 hal::bsp_pins!(

boards/pico_explorer/Cargo.toml

@@ -18,14 +18,15 @@ st7789 = "0.6.1"
 display-interface-spi = "0.4.1"
 embedded-time = "0.12.0"
 embedded-graphics = "0.7.1"
-
+rp2040-boot2 = { version = "0.2.0", optional = true }
-[features]
-default = ["rt"]
-rt = ["cortex-m-rt","rp2040-hal/rt"]
 
 [dev-dependencies]
 display-interface = "0.4.1"
 panic-halt = "0.2.0"
 arrayvec = { version="0.7.1", default-features=false }
-rp2040-boot2 = "0.2"
 nb = "1.0.0"
+
+[features]
+default = ["boot2", "rt"]
+boot2 = ["rp2040-boot2"]
+rt = ["cortex-m-rt","rp2040-hal/rt"]

boards/pico_explorer/examples/pico_explorer_showcase.rs

@@ -16,10 +16,6 @@ use hal::{adc::Adc, clocks::*, sio::Sio, watchdog::Watchdog};
 use panic_halt as _;
 use pico_explorer::{hal, pac, Button, PicoExplorer, XOSC_CRYSTAL_FREQ};
 
-#[link_section = ".boot2"]
-#[used]
-pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
-
 // See 4.9.5 from RP2040 datasheet
 fn calc_temp(adc_value: f32, refv: f64) -> f64 {
     let vbe: f64 = f64::from(adc_value) * refv;

boards/pico_explorer/src/lib.rs

@@ -7,6 +7,15 @@ extern crate cortex_m_rt;
 
 #[cfg(feature = "rt")]
 pub use cortex_m_rt::entry;
+
+//// The linker will place this boot block at the start of our program image. We
+//// need this to help the ROM bootloader get our code up and running.
+#[cfg(feature = "boot2")]
+#[link_section = ".boot2"]
+#[no_mangle]
+#[used]
+pub static BOOT2_FIRMWARE: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
+
 use display_interface_spi::SPIInterface;
 use embedded_graphics::{
     draw_target::DrawTarget,

boards/pico_lipo_16mb/Cargo.toml

@@ -13,16 +13,16 @@ license = "MIT OR Apache-2.0"
 cortex-m = "0.7.2"
 rp2040-hal = { path = "../../rp2040-hal", version = "0.3.0"}
 cortex-m-rt = { version = "0.7", optional = true }
+rp2040-boot2 = { version = "0.2.0", optional = true }
 
 [dev-dependencies]
 embedded-time = "0.12.0"
 panic-halt= "0.2.0"
 embedded-hal ="0.2.5"
 cortex-m-rtic = "0.6.0-alpha.5"
-rp2040-boot2 = "0.2"
 nb = "1.0"
 
-
 [features]
-default = ["rt"]
+default = ["boot2", "rt"]
+boot2 = ["rp2040-boot2"]
 rt = ["cortex-m-rt","rp2040-hal/rt"]

boards/pico_lipo_16mb/examples/pico_lipo_16mb_blinky.rs

@@ -34,12 +34,6 @@ use pico_lipo_16_mb::hal::pac;
 // higher-level drivers.
 use pico_lipo_16_mb::hal;
 
-//// The linker will place this boot block at the start of our program image. We
-//// need this to help the ROM bootloader get our code up and running.
-#[link_section = ".boot2"]
-#[used]
-pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
-
 /// Entry point to our bare-metal application.
 ///
 /// The `#[entry]` macro ensures the Cortex-M start-up code calls this function

boards/pico_lipo_16mb/src/lib.rs

@@ -7,6 +7,14 @@ extern crate cortex_m_rt;
 #[cfg(feature = "rt")]
 pub use cortex_m_rt::entry;
 
+//// The linker will place this boot block at the start of our program image. We
+//// need this to help the ROM bootloader get our code up and running.
+#[cfg(feature = "boot2")]
+#[link_section = ".boot2"]
+#[no_mangle]
+#[used]
+pub static BOOT2_FIRMWARE: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
+
 pub use hal::pac;
 
 hal::bsp_pins!(

boards/pro_micro_rp2040/Cargo.toml

@@ -14,16 +14,17 @@ cortex-m = "0.7.2"
 rp2040-hal = { path = "../../rp2040-hal", version = "0.3.0" }
 cortex-m-rt = { version = "0.7.0", optional = true }
 embedded-hal = { version = "0.2.4", features = ["unproven"] }
-
+rp2040-boot2 = { version = "0.2.0", optional = true }
-[features]
-default = ["rt"]
-rt = ["cortex-m-rt", "rp2040-hal/rt"]
 
 [dev-dependencies]
 panic-halt = "0.2.0"
-rp2040-boot2 = "0.2"
 smart-leds = "0.3.0"
 embedded-time = "0.12.0"
 nb = "1.0.0"
 pio = { git = "https://github.com/rp-rs/pio-rs.git", branch = "main" }
 ws2812-pio = { git = "https://github.com/ithinuel/ws2812-pio-rs", rev = "7a11616f994025f5c99f28b283d2b25d60d46a43" }
+
+[features]
+default = ["boot2", "rt"]
+boot2 = ["rp2040-boot2"]
+rt = ["cortex-m-rt","rp2040-hal/rt"]

boards/pro_micro_rp2040/examples/pro_micro_rainbow.rs

@@ -28,12 +28,6 @@ use rp2040_hal::pio::PIOExt;
 use smart_leds::{brightness, SmartLedsWrite, RGB8};
 use ws2812_pio::Ws2812;
 
-//// The linker will place this boot block at the start of our program image.
-/// We need this to help the ROM bootloader get our code up and running.
-#[link_section = ".boot2"]
-#[used]
-pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
-
 /// Entry point to our bare-metal application.
 ///
 /// The `#[entry]` macro ensures the Cortex-M start-up code calls this

boards/pro_micro_rp2040/src/lib.rs

@@ -6,6 +6,14 @@ extern crate cortex_m_rt;
 #[cfg(feature = "rt")]
 pub use cortex_m_rt::entry;
 
+//// The linker will place this boot block at the start of our program image. We
+//// need this to help the ROM bootloader get our code up and running.
+#[cfg(feature = "boot2")]
+#[link_section = ".boot2"]
+#[no_mangle]
+#[used]
+pub static BOOT2_FIRMWARE: [u8; 256] = rp2040_boot2::BOOT_LOADER_W25Q080;
+
 pub use hal::pac;
 
 hal::bsp_pins!(

boards/qt_py_rp2040/Cargo.toml

@@ -14,16 +14,17 @@ cortex-m = "0.7.2"
 rp2040-hal = { path = "../../rp2040-hal", version = "0.3.0"}
 cortex-m-rt = { version = "0.7", optional = true }
 embedded-time = "0.12.0"
+rp2040-boot2 = { version = "0.2.0", optional = true }
 
 [dev-dependencies]
 panic-halt= "0.2.0"
 embedded-hal ="0.2.5"
-rp2040-boot2 = "0.2"
 smart-leds = "0.3"
 nb = "1.0.0"
 pio = { git = "https://github.com/rp-rs/pio-rs.git", branch = "main" }
 ws2812-pio = { git = "https://github.com/ithinuel/ws2812-pio-rs", rev = "7a11616f994025f5c99f28b283d2b25d60d46a43" }
 
 [features]
-default = ["rt"]
+default = ["boot2", "rt"]
+boot2 = ["rp2040-boot2"]
 rt = ["cortex-m-rt","rp2040-hal/rt"]

boards/qt_py_rp2040/examples/qt_py_rainbow.rs

@@ -22,10 +22,6 @@ use qt_py_rp2040::{
     Pins, XOSC_CRYSTAL_FREQ,
 };
 
-#[link_section = ".boot2"]
-#[used]
-pub static BOOT2: [u8; 256] = rp2040_boot2::BOOT_LOADER_GD25Q64CS;
-
 #[entry]
 fn main() -> ! {
     let mut pac = pac::Peripherals::take().unwrap();

boards/qt_py_rp2040/src/lib.rs

@@ -7,6 +7,14 @@ extern crate cortex_m_rt;
 #[cfg(feature = "rt")]
 pub use cortex_m_rt::entry;
 
+//// The linker will place this boot block at the start of our program image. We
+//// need this to help the ROM bootloader get our code up and running.
+#[cfg(feature = "boot2")]
+#[link_section = ".boot2"]
+#[no_mangle]
+#[used]
+pub static BOOT2_FIRMWARE: [u8; 256] = rp2040_boot2::BOOT_LOADER_GD25Q64CS;
+
 pub use hal::pac;
 
 hal::bsp_pins!(

memory.x

@@ -4,6 +4,8 @@ MEMORY {
     RAM   : ORIGIN = 0x20000000, LENGTH = 256K
 }
 
+EXTERN(BOOT2_FIRMWARE)
+
 SECTIONS {
     /* ### Boot loader */
     .boot2 ORIGIN(BOOT2) :

rp2040-hal/Cargo.toml

@@ -39,7 +39,7 @@ optional = true
 [dev-dependencies]
 cortex-m-rt = "0.7"
 panic-halt = "0.2.0"
-rp2040-boot2 = "0.2"
+rp2040-boot2 = "0.2.0"
 hd44780-driver = "0.4.0"
 pio-proc = { git = "https://github.com/rp-rs/pio-rs.git", branch = "main" }