diff --git a/zynq/.gitignore b/zynq/.gitignore
index 5a44eef..03314f7 100644
--- a/zynq/.gitignore
+++ b/zynq/.gitignore
@@ -1 +1 @@
-/Cargo.lock
+Cargo.lock
diff --git a/zynq/Cargo.toml b/zynq/Cargo.toml
index 2adf0c5..9101e86 100644
--- a/zynq/Cargo.toml
+++ b/zynq/Cargo.toml
@@ -11,7 +11,11 @@ members = [
   "examples/embassy",
   "examples/zedboard",
 
-  "zedboard-fsbl",
   "zedboard-bsp",
   "zedboard-qspi-flasher",
 ]
+
+exclude = [
+  # Exclude, can not be built with debug optimization level, too large.
+  "zedboard-fsbl",
+]
diff --git a/zynq/zedboard-fsbl/Cargo.toml b/zynq/zedboard-fsbl/Cargo.toml
index c6008be..6065e88 100644
--- a/zynq/zedboard-fsbl/Cargo.toml
+++ b/zynq/zedboard-fsbl/Cargo.toml
@@ -9,7 +9,7 @@ repository = "https://egit.irs.uni-stuttgart.de/rust/zynq7000-rs"
 license = "MIT OR Apache-2.0"
 
 [dependencies]
-cortex-ar = "0.3"
+cortex-ar = { version = "0.3", features = ["critical-section-single-core"] }
 zynq7000-rt = { path = "../zynq7000-rt" }
 zynq7000 = { path = "../zynq7000" }
 zynq7000-hal = { path = "../zynq7000-hal" }