diff --git a/Cargo.lock b/Cargo.lock
index 7391c76..4aca18f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -62,7 +62,7 @@ dependencies = [
 [[package]]
 name = "libasync"
 version = "0.0.0"
-source = "git+https://git.m-labs.hk/M-Labs/zc706.git#63d71d021ca673d0b34a44279cd13e120d810835"
+source = "git+https://git.m-labs.hk/M-Labs/zc706.git#aa9379463207a02ee7ca4e597054a447b9a90232"
 dependencies = [
  "embedded-hal",
  "libcortex_a9",
@@ -74,7 +74,7 @@ dependencies = [
 [[package]]
 name = "libboard_zynq"
 version = "0.0.0"
-source = "git+https://git.m-labs.hk/M-Labs/zc706.git#63d71d021ca673d0b34a44279cd13e120d810835"
+source = "git+https://git.m-labs.hk/M-Labs/zc706.git#aa9379463207a02ee7ca4e597054a447b9a90232"
 dependencies = [
  "bit_field",
  "embedded-hal",
@@ -89,7 +89,7 @@ dependencies = [
 [[package]]
 name = "libcortex_a9"
 version = "0.0.0"
-source = "git+https://git.m-labs.hk/M-Labs/zc706.git#63d71d021ca673d0b34a44279cd13e120d810835"
+source = "git+https://git.m-labs.hk/M-Labs/zc706.git#aa9379463207a02ee7ca4e597054a447b9a90232"
 dependencies = [
  "bit_field",
  "libregister",
@@ -98,7 +98,7 @@ dependencies = [
 [[package]]
 name = "libregister"
 version = "0.0.0"
-source = "git+https://git.m-labs.hk/M-Labs/zc706.git#63d71d021ca673d0b34a44279cd13e120d810835"
+source = "git+https://git.m-labs.hk/M-Labs/zc706.git#aa9379463207a02ee7ca4e597054a447b9a90232"
 dependencies = [
  "bit_field",
  "vcell",
@@ -108,7 +108,7 @@ dependencies = [
 [[package]]
 name = "libsupport_zynq"
 version = "0.0.0"
-source = "git+https://git.m-labs.hk/M-Labs/zc706.git#63d71d021ca673d0b34a44279cd13e120d810835"
+source = "git+https://git.m-labs.hk/M-Labs/zc706.git#aa9379463207a02ee7ca4e597054a447b9a90232"
 dependencies = [
  "compiler_builtins",
  "libboard_zynq",
diff --git a/runtime/src/main.rs b/runtime/src/main.rs
index 6db3419..2156a2d 100644
--- a/runtime/src/main.rs
+++ b/runtime/src/main.rs
@@ -46,7 +46,7 @@ pub fn main_core0() {
     libboard_zynq::stdio::drop_uart(); // reinitialize UART after clocking change
     let mut ddr = zynq::ddr::DdrRam::new();
     ram::init_alloc(&mut ddr);
-    let timer = GlobalTimer::new();
+    let timer = GlobalTimer::start();
 
     println!("Detected gateware: {}", identifier_read(&mut [0; 64]));