lower opt level to avoid axi burst

src/Cargo.lock

@@ -384,9 +384,9 @@ checksum = "c75de51135344a4f8ed3cfe2720dc27736f7711989703a0b43aadf3753c55577"
 
 [[package]]
 name = "nalgebra"
-version = "0.33.1"
+version = "0.33.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3bf139e93ad757869338ad85239cb1d6c067b23b94e5846e637ca6328ee4be60"
+checksum = "26aecdf64b707efd1310e3544d709c5c0ac61c13756046aaaba41be5c4f66a3b"
 dependencies = [
  "approx",
  "num-complex",

src/Cargo.toml

@@ -14,5 +14,5 @@ members = [
 panic = "abort"
 debug = true
 codegen-units = 1
-opt-level = 2
+opt-level = 1
 lto = true

src/runtime/src/comms.rs

@@ -488,14 +488,14 @@ async fn handle_run_kernel(
                             kernel::Message::RpcRecvRequest(slot) => slot,
                             other => panic!("expected root value slot from core1, not {:?}", other),
                         };
-                        let remaining_tags = rpc::recv_return(&mut reader, &current_tags, slot, &mut |size| {
+                        let remaining_tags = rpc::recv_return(&mut reader, &current_tags, slot, &mut |size| -> Result<*mut ()> {
                             if size == 0 {
-                                0 as *mut ()
+                                Ok(0 as *mut ())
                             } else {
                                 let mut control = control.borrow_mut();
                                 control.tx.send(kernel::Message::RpcRecvReply(Ok(size)));
                                 match control.rx.recv() {
-                                    kernel::Message::RpcRecvRequest(slot) => slot,
+                                    kernel::Message::RpcRecvRequest(slot) => Ok(slot),
                                     other => {
                                         panic!("expected nested value slot from kernel CPU, not {:?}", other)
                                     }

src/runtime/src/rtio_mgt.rs

@@ -55,8 +55,8 @@ pub mod drtio {
         }
     }
 
-    impl From<DrtioError> for Error {
+    impl<T> From<DrtioError<T>> for Error {
-        fn from(_error: DrtioError) -> Self {
+        fn from(_error: DrtioError<T>) -> Self {
             Error::AuxError
         }
     }

src/satman/src/subkernel.rs

@@ -9,7 +9,7 @@ use core::{slice, str};
 use cslice::AsCSlice;
 use dma::{Error as DmaError, Manager as DmaManager};
 use io::{Cursor, Error as IoError, ProtoWrite, Write};
-use ksupport::{eh_artiq, kernel, rpc};
+use ksupport::{eh_artiq, kernel, rpc, rtio};
 use libboard_artiq::{
     drtio_routing::RoutingTable,
     drtioaux,