diff --git a/default.nix b/default.nix
index ae54d00..6e174c5 100644
--- a/default.nix
+++ b/default.nix
@@ -20,7 +20,7 @@ let
       name = "firmware";
 
       src = ./src;
-      cargoSha256 = "11qxy008hb5nsir1qrh42zp8idfmc33lvc4xq9gfgj88zw6qh3d3";
+      cargoSha256 = "1h6zm7kq1f24kyjgmmmq7b9jydvs23glsrfij6s86nlwbhd5xrcb";
 
       nativeBuildInputs = [
         pkgs.gnumake
diff --git a/src/Cargo.lock b/src/Cargo.lock
index 561b44f..9f5a70d 100644
--- a/src/Cargo.lock
+++ b/src/Cargo.lock
@@ -56,7 +56,7 @@ checksum = "3748f82c7d366a0b4950257d19db685d4958d2fa27c6d164a3f069fec42b748b"
 [[package]]
 name = "core_io"
 version = "0.1.20200410"
-source = "git+https://git.m-labs.hk/M-Labs/zynq-rs.git#4aa252546f3559c9060ce731943372ad30d16eef"
+source = "git+https://git.m-labs.hk/M-Labs/zynq-rs.git#6e6612bc3e12e50b4f6e61cde47100c3d4ab982a"
 dependencies = [
  "memchr",
 ]
@@ -186,7 +186,7 @@ dependencies = [
 [[package]]
 name = "libasync"
 version = "0.0.0"
-source = "git+https://git.m-labs.hk/M-Labs/zynq-rs.git#4aa252546f3559c9060ce731943372ad30d16eef"
+source = "git+https://git.m-labs.hk/M-Labs/zynq-rs.git#6e6612bc3e12e50b4f6e61cde47100c3d4ab982a"
 dependencies = [
  "embedded-hal",
  "libcortex_a9",
@@ -198,7 +198,7 @@ dependencies = [
 [[package]]
 name = "libboard_zynq"
 version = "0.0.0"
-source = "git+https://git.m-labs.hk/M-Labs/zynq-rs.git#4aa252546f3559c9060ce731943372ad30d16eef"
+source = "git+https://git.m-labs.hk/M-Labs/zynq-rs.git#6e6612bc3e12e50b4f6e61cde47100c3d4ab982a"
 dependencies = [
  "bit_field",
  "embedded-hal",
@@ -223,7 +223,7 @@ dependencies = [
 [[package]]
 name = "libconfig"
 version = "0.1.0"
-source = "git+https://git.m-labs.hk/M-Labs/zynq-rs.git#4aa252546f3559c9060ce731943372ad30d16eef"
+source = "git+https://git.m-labs.hk/M-Labs/zynq-rs.git#6e6612bc3e12e50b4f6e61cde47100c3d4ab982a"
 dependencies = [
  "core_io",
  "fatfs",
@@ -234,7 +234,7 @@ dependencies = [
 [[package]]
 name = "libcortex_a9"
 version = "0.0.0"
-source = "git+https://git.m-labs.hk/M-Labs/zynq-rs.git#4aa252546f3559c9060ce731943372ad30d16eef"
+source = "git+https://git.m-labs.hk/M-Labs/zynq-rs.git#6e6612bc3e12e50b4f6e61cde47100c3d4ab982a"
 dependencies = [
  "bit_field",
  "libregister",
@@ -250,7 +250,7 @@ checksum = "c7d73b3f436185384286bd8098d17ec07c9a7d2388a6599f824d8502b529702a"
 [[package]]
 name = "libregister"
 version = "0.0.0"
-source = "git+https://git.m-labs.hk/M-Labs/zynq-rs.git#4aa252546f3559c9060ce731943372ad30d16eef"
+source = "git+https://git.m-labs.hk/M-Labs/zynq-rs.git#6e6612bc3e12e50b4f6e61cde47100c3d4ab982a"
 dependencies = [
  "bit_field",
  "vcell",
@@ -260,7 +260,7 @@ dependencies = [
 [[package]]
 name = "libsupport_zynq"
 version = "0.0.0"
-source = "git+https://git.m-labs.hk/M-Labs/zynq-rs.git#4aa252546f3559c9060ce731943372ad30d16eef"
+source = "git+https://git.m-labs.hk/M-Labs/zynq-rs.git#6e6612bc3e12e50b4f6e61cde47100c3d4ab982a"
 dependencies = [
  "cc",
  "compiler_builtins",
diff --git a/src/runtime/src/main.rs b/src/runtime/src/main.rs
index 5fa0f4a..e846ae4 100644
--- a/src/runtime/src/main.rs
+++ b/src/runtime/src/main.rs
@@ -22,6 +22,7 @@ use void::Void;
 use embedded_hal::blocking::delay::DelayMs;
 use libconfig::Config;
 use libregister::RegisterW;
+use libcortex_a9::l2c::enable_l2_cache;
 
 mod proto_core_io;
 mod proto_async;
@@ -162,6 +163,7 @@ static mut LOG_BUFFER: [u8; 1<<17] = [0; 1<<17];
 
 #[no_mangle]
 pub fn main_core0() {
+    enable_l2_cache(0x8);
     let mut timer = GlobalTimer::start();
 
     let buffer_logger = unsafe {
diff --git a/zynq-rs.nix b/zynq-rs.nix
index f1899d6..2eba915 100644
--- a/zynq-rs.nix
+++ b/zynq-rs.nix
@@ -3,6 +3,6 @@ let
 in
   pkgs.fetchgit {
     url = "https://git.m-labs.hk/M-Labs/zynq-rs.git";
-    rev = "4aa252546f3559c9060ce731943372ad30d16eef";
-    sha256 = "0q9b75w6mbnsyyryainng27glxwhis325bmpv4bvzm7r9almsvks";
+    rev = "6e6612bc3e12e50b4f6e61cde47100c3d4ab982a";
+    sha256 = "14hj77n9g2zack6sjgs7337j8yq9r3jrpdsmc62kmxfbbmy8jhlg";
   }