diff --git a/embassy-cortex-m/src/interrupt.rs b/embassy-cortex-m/src/interrupt.rs
index 8e45c36c..e9fa43e8 100644
--- a/embassy-cortex-m/src/interrupt.rs
+++ b/embassy-cortex-m/src/interrupt.rs
@@ -9,12 +9,13 @@ use cortex_m::peripheral::NVIC;
 #[macro_export]
 macro_rules! interrupt_mod {
     ($($irqs:ident),* $(,)?) => {
+        #[cfg(feature = "rt")]
         pub use cortex_m_rt::interrupt;
 
         /// Interrupt definitions.
         pub mod interrupt {
             pub use embassy_cortex_m::interrupt::{InterruptExt, Priority};
-            pub use crate::pac::interrupt::*;
+            pub use crate::pac::Interrupt::*;
             pub use crate::pac::Interrupt;
 
             /// Type-level interrupt infrastructure.
diff --git a/embassy-nrf/Cargo.toml b/embassy-nrf/Cargo.toml
index 83900d4d..5fab11f3 100644
--- a/embassy-nrf/Cargo.toml
+++ b/embassy-nrf/Cargo.toml
@@ -16,7 +16,8 @@ flavors = [
 ]
 
 [features]
-default = [
+default = ["rt"]
+rt = [
     "nrf52805-pac?/rt",
     "nrf52810-pac?/rt",
     "nrf52811-pac?/rt",
diff --git a/embassy-nrf/src/gpiote.rs b/embassy-nrf/src/gpiote.rs
index 1d7725bd..21d0d956 100644
--- a/embassy-nrf/src/gpiote.rs
+++ b/embassy-nrf/src/gpiote.rs
@@ -91,18 +91,21 @@ pub(crate) fn init(irq_prio: crate::interrupt::Priority) {
 }
 
 #[cfg(any(feature = "nrf5340-app-s", feature = "nrf9160-s"))]
+#[cfg(feature = "rt")]
 #[interrupt]
 fn GPIOTE0() {
     unsafe { handle_gpiote_interrupt() };
 }
 
 #[cfg(any(feature = "nrf5340-app-ns", feature = "nrf9160-ns"))]
+#[cfg(feature = "rt")]
 #[interrupt]
 fn GPIOTE1() {
     unsafe { handle_gpiote_interrupt() };
 }
 
 #[cfg(any(feature = "_nrf52", feature = "nrf5340-net"))]
+#[cfg(feature = "rt")]
 #[interrupt]
 fn GPIOTE() {
     unsafe { handle_gpiote_interrupt() };
diff --git a/embassy-nrf/src/time_driver.rs b/embassy-nrf/src/time_driver.rs
index f993d7b2..f1ab4f8f 100644
--- a/embassy-nrf/src/time_driver.rs
+++ b/embassy-nrf/src/time_driver.rs
@@ -295,6 +295,7 @@ impl Driver for RtcDriver {
     }
 }
 
+#[cfg(feature = "rt")]
 #[interrupt]
 fn RTC1() {
     DRIVER.on_interrupt()
diff --git a/embassy-rp/Cargo.toml b/embassy-rp/Cargo.toml
index ddada655..ee06e99c 100644
--- a/embassy-rp/Cargo.toml
+++ b/embassy-rp/Cargo.toml
@@ -13,7 +13,8 @@ flavors = [
 ]
 
 [features]
-default = [ "rp-pac/rt" ]
+default = [ "rt" ]
+rt = [ "rp-pac/rt" ]
 
 defmt = ["dep:defmt", "embassy-usb-driver?/defmt", "embassy-hal-common/defmt"]
 
diff --git a/embassy-rp/src/dma.rs b/embassy-rp/src/dma.rs
index 042ca99a..25819f03 100644
--- a/embassy-rp/src/dma.rs
+++ b/embassy-rp/src/dma.rs
@@ -12,6 +12,7 @@ use crate::interrupt::InterruptExt;
 use crate::pac::dma::vals;
 use crate::{interrupt, pac, peripherals};
 
+#[cfg(feature = "rt")]
 #[interrupt]
 unsafe fn DMA_IRQ_0() {
     let ints0 = pac::DMA.ints0().read().ints0();
diff --git a/embassy-rp/src/gpio.rs b/embassy-rp/src/gpio.rs
index ebd932f5..66faa248 100644
--- a/embassy-rp/src/gpio.rs
+++ b/embassy-rp/src/gpio.rs
@@ -142,6 +142,7 @@ pub(crate) unsafe fn init() {
     interrupt::IO_IRQ_BANK0.enable();
 }
 
+#[cfg(feature = "rt")]
 #[interrupt]
 unsafe fn IO_IRQ_BANK0() {
     let cpu = SIO.cpuid().read() as usize;
diff --git a/embassy-rp/src/lib.rs b/embassy-rp/src/lib.rs
index 5e3e5969..4e4b7614 100644
--- a/embassy-rp/src/lib.rs
+++ b/embassy-rp/src/lib.rs
@@ -43,6 +43,7 @@ pub use rp_pac as pac;
 #[cfg(not(feature = "unstable-pac"))]
 pub(crate) use rp_pac as pac;
 
+#[cfg(feature = "rt")]
 pub use crate::pac::NVIC_PRIO_BITS;
 
 embassy_cortex_m::interrupt_mod!(
diff --git a/embassy-rp/src/multicore.rs b/embassy-rp/src/multicore.rs
index e1246ce8..2a7e4822 100644
--- a/embassy-rp/src/multicore.rs
+++ b/embassy-rp/src/multicore.rs
@@ -106,6 +106,7 @@ impl<const SIZE: usize> Stack<SIZE> {
     }
 }
 
+#[cfg(feature = "rt")]
 #[interrupt]
 #[link_section = ".data.ram_func"]
 unsafe fn SIO_IRQ_PROC1() {
@@ -297,6 +298,7 @@ fn fifo_read() -> u32 {
 
 // Pop a value from inter-core FIFO, `wfe` until available
 #[inline(always)]
+#[allow(unused)]
 fn fifo_read_wfe() -> u32 {
     unsafe {
         let sio = pac::SIO;
diff --git a/embassy-rp/src/pio.rs b/embassy-rp/src/pio.rs
index f0a5c17a..0fa3bd77 100644
--- a/embassy-rp/src/pio.rs
+++ b/embassy-rp/src/pio.rs
@@ -85,6 +85,7 @@ const RXNEMPTY_MASK: u32 = 1 << 0;
 const TXNFULL_MASK: u32 = 1 << 4;
 const SMIRQ_MASK: u32 = 1 << 8;
 
+#[cfg(feature = "rt")]
 #[interrupt]
 unsafe fn PIO0_IRQ_0() {
     use crate::pac;
@@ -97,6 +98,7 @@ unsafe fn PIO0_IRQ_0() {
     pac::PIO0.irqs(0).inte().write_clear(|m| m.0 = ints);
 }
 
+#[cfg(feature = "rt")]
 #[interrupt]
 unsafe fn PIO1_IRQ_0() {
     use crate::pac;
diff --git a/embassy-rp/src/timer.rs b/embassy-rp/src/timer.rs
index 37f86c93..ca8c96c0 100644
--- a/embassy-rp/src/timer.rs
+++ b/embassy-rp/src/timer.rs
@@ -151,21 +151,25 @@ pub unsafe fn init() {
     interrupt::TIMER_IRQ_3.enable();
 }
 
+#[cfg(feature = "rt")]
 #[interrupt]
 unsafe fn TIMER_IRQ_0() {
     DRIVER.check_alarm(0)
 }
 
+#[cfg(feature = "rt")]
 #[interrupt]
 unsafe fn TIMER_IRQ_1() {
     DRIVER.check_alarm(1)
 }
 
+#[cfg(feature = "rt")]
 #[interrupt]
 unsafe fn TIMER_IRQ_2() {
     DRIVER.check_alarm(2)
 }
 
+#[cfg(feature = "rt")]
 #[interrupt]
 unsafe fn TIMER_IRQ_3() {
     DRIVER.check_alarm(3)
diff --git a/embassy-stm32/Cargo.toml b/embassy-stm32/Cargo.toml
index 4e29bb32..f1f894c6 100644
--- a/embassy-stm32/Cargo.toml
+++ b/embassy-stm32/Cargo.toml
@@ -79,7 +79,9 @@ quote = "1.0.15"
 stm32-metapac = { version = "9", default-features = false, features = ["metadata"]}
 
 [features]
-default = ["stm32-metapac/rt"]
+default = ["rt"]
+rt = ["stm32-metapac/rt"]
+
 defmt = ["dep:defmt", "bxcan/unstable-defmt", "embassy-sync/defmt", "embassy-executor/defmt", "embassy-embedded-hal/defmt", "embassy-hal-common/defmt", "embedded-io?/defmt", "embassy-usb-driver?/defmt", "embassy-net-driver/defmt"]
 memory-x = ["stm32-metapac/memory-x"]
 exti = []
diff --git a/embassy-stm32/build.rs b/embassy-stm32/build.rs
index 267fec38..ba5f91cc 100644
--- a/embassy-stm32/build.rs
+++ b/embassy-stm32/build.rs
@@ -295,6 +295,7 @@ fn main() {
         let channels = channels.iter().map(|(_, dma, ch)| format_ident!("{}_{}", dma, ch));
 
         g.extend(quote! {
+            #[cfg(feature = "rt")]
             #[crate::interrupt]
             unsafe fn #irq () {
                 #(
diff --git a/embassy-stm32/src/exti.rs b/embassy-stm32/src/exti.rs
index a2ed0709..0631ae47 100644
--- a/embassy-stm32/src/exti.rs
+++ b/embassy-stm32/src/exti.rs
@@ -291,6 +291,7 @@ macro_rules! foreach_exti_irq {
 
 macro_rules! impl_irq {
     ($e:ident) => {
+        #[cfg(feature = "rt")]
         #[interrupt]
         unsafe fn $e() {
             on_irq()
diff --git a/embassy-stm32/src/lib.rs b/embassy-stm32/src/lib.rs
index 565d6817..f8857fdd 100644
--- a/embassy-stm32/src/lib.rs
+++ b/embassy-stm32/src/lib.rs
@@ -111,6 +111,7 @@ pub use stm32_metapac as pac;
 #[cfg(not(feature = "unstable-pac"))]
 pub(crate) use stm32_metapac as pac;
 
+#[cfg(feature = "rt")]
 pub use crate::pac::NVIC_PRIO_BITS;
 
 #[non_exhaustive]
diff --git a/embassy-stm32/src/rng.rs b/embassy-stm32/src/rng.rs
index 1e16b847..c657bf70 100644
--- a/embassy-stm32/src/rng.rs
+++ b/embassy-stm32/src/rng.rs
@@ -149,6 +149,7 @@ foreach_peripheral!(
     };
 );
 
+#[cfg(feature = "rt")]
 macro_rules! irq {
     ($irq:ident) => {
         mod rng_irq {
@@ -166,6 +167,7 @@ macro_rules! irq {
     };
 }
 
+#[cfg(feature = "rt")]
 foreach_interrupt!(
     (RNG) => {
         irq!(RNG);
diff --git a/embassy-stm32/src/time_driver.rs b/embassy-stm32/src/time_driver.rs
index 8f282baf..e82501a4 100644
--- a/embassy-stm32/src/time_driver.rs
+++ b/embassy-stm32/src/time_driver.rs
@@ -40,6 +40,7 @@ type T = peripherals::TIM15;
 foreach_interrupt! {
     (TIM2, timer, $block:ident, UP, $irq:ident) => {
         #[cfg(time_driver_tim2)]
+        #[cfg(feature = "rt")]
         #[interrupt]
         fn $irq() {
             DRIVER.on_interrupt()
@@ -47,6 +48,7 @@ foreach_interrupt! {
     };
     (TIM3, timer, $block:ident, UP, $irq:ident) => {
         #[cfg(time_driver_tim3)]
+        #[cfg(feature = "rt")]
         #[interrupt]
         fn $irq() {
             DRIVER.on_interrupt()
@@ -54,6 +56,7 @@ foreach_interrupt! {
     };
     (TIM4, timer, $block:ident, UP, $irq:ident) => {
         #[cfg(time_driver_tim4)]
+        #[cfg(feature = "rt")]
         #[interrupt]
         fn $irq() {
             DRIVER.on_interrupt()
@@ -61,6 +64,7 @@ foreach_interrupt! {
     };
     (TIM5, timer, $block:ident, UP, $irq:ident) => {
         #[cfg(time_driver_tim5)]
+        #[cfg(feature = "rt")]
         #[interrupt]
         fn $irq() {
             DRIVER.on_interrupt()
@@ -68,6 +72,7 @@ foreach_interrupt! {
     };
     (TIM12, timer, $block:ident, UP, $irq:ident) => {
         #[cfg(time_driver_tim12)]
+        #[cfg(feature = "rt")]
         #[interrupt]
         fn $irq() {
             DRIVER.on_interrupt()
@@ -75,6 +80,7 @@ foreach_interrupt! {
     };
     (TIM15, timer, $block:ident, UP, $irq:ident) => {
         #[cfg(time_driver_tim15)]
+        #[cfg(feature = "rt")]
         #[interrupt]
         fn $irq() {
             DRIVER.on_interrupt()