diff --git a/src/runtime/src/main.rs b/src/runtime/src/main.rs
index 570c41a..2c5910e 100644
--- a/src/runtime/src/main.rs
+++ b/src/runtime/src/main.rs
@@ -12,6 +12,7 @@
 #[macro_use]
 extern crate alloc;
 
+#[cfg(feature = "target_kasli_soc")]
 use core::cell::RefCell;
 
 use libasync::{block_async, task};
@@ -143,6 +144,7 @@ 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 5b90514..1b71590 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;