diff --git a/src/runtime/src/main.rs b/src/runtime/src/main.rs
index 4d07248..036e085 100644
--- a/src/runtime/src/main.rs
+++ b/src/runtime/src/main.rs
@@ -11,6 +11,7 @@
 
 extern crate alloc;
 
+#[cfg(feature = "target_kasli_soc")]
 use core::cell::RefCell;
 use log::{info, warn, error};
 
@@ -148,6 +149,7 @@ pub fn main_core0() {
     info!("gateware ident: {}", identifier_read(&mut [0; 64]));
 
     i2c::init();
+    #[cfg(feature = "target_kasli_soc")]
     let i2c_bus = unsafe { (i2c::I2C_BUS).as_mut().unwrap() };
 
     #[cfg(feature = "target_kasli_soc")]
diff --git a/src/runtime/src/rtio_acp.rs b/src/runtime/src/rtio_acp.rs
index 4c1f33b..d356b8c 100644
--- a/src/runtime/src/rtio_acp.rs
+++ b/src/runtime/src/rtio_acp.rs
@@ -11,6 +11,7 @@ pub const RTIO_O_STATUS_UNDERFLOW:                 i32 = 2;
 pub const RTIO_O_STATUS_DESTINATION_UNREACHABLE:   i32 = 4;
 pub const RTIO_I_STATUS_WAIT_EVENT:                i32 = 1;
 pub const RTIO_I_STATUS_OVERFLOW:                  i32 = 2;
+#[allow(unused)]
 pub const RTIO_I_STATUS_WAIT_STATUS:               i32 = 4; // TODO
 pub const RTIO_I_STATUS_DESTINATION_UNREACHABLE:   i32 = 8;