zc706: fix rustcfg, runtime warnings

src/gateware/zc706.py

@@ -690,6 +690,8 @@ def write_mem_file(soc, filename):
 
 def write_rustc_cfg_file(soc, filename):
     with open(filename, "w") as f:
+        for name, origin, busword, obj in soc.get_csr_regions():
+            f.write("has_{}\n".format(name.lower()))
         for k, v in sorted(soc.rustc_cfg.items(), key=itemgetter(0)):
             if v is None:
                 f.write("{}\n".format(k))

src/runtime/src/main.rs

@@ -8,6 +8,7 @@
 #[macro_use]
 extern crate alloc;
 
+#[cfg(feature = "target_kasli_soc")]
 use core::cell::RefCell;
 
 use ksupport;
@@ -74,6 +75,7 @@ pub fn main_core0() {
     info!("gateware ident: {}", identifier_read(&mut [0; 64]));
 
     ksupport::i2c::init();
+    #[cfg(feature = "target_kasli_soc")]
     let i2c_bus = unsafe { (ksupport::i2c::I2C_BUS).as_mut().unwrap() };
 
     #[cfg(feature = "target_kasli_soc")]