diff --git a/configs/vms/nimbos-aarch64-qemu-smp1.toml b/configs/vms/nimbos-aarch64-qemu-smp1.toml
index 7106afea..88a789e8 100644
--- a/configs/vms/nimbos-aarch64-qemu-smp1.toml
+++ b/configs/vms/nimbos-aarch64-qemu-smp1.toml
@@ -66,10 +66,10 @@ emu_devices = [
 # Name Base-Ipa Base-Pa Length Alloc-Irq.
 passthrough_devices = [
     ["/"],
-    #["/timer"],
+    #["/pl011@9000000"],
 ]
 
 # Devices that are not desired to be passed through to the guest
 excluded_devices = [
-   # ["/gic-v3"],
+    ["/pcie@10000000"],
 ]
\ No newline at end of file
diff --git a/src/vmm/images/mod.rs b/src/vmm/images/mod.rs
index 9c6ccc43..922a15a2 100644
--- a/src/vmm/images/mod.rs
+++ b/src/vmm/images/mod.rs
@@ -107,17 +107,19 @@ impl ImageLoader {
             .expect("Failed to load VM images");
         // Load DTB image
         let vm_config = axvm::config::AxVMConfig::from(self.config.clone());
-        if let Some(dtb_arc) = get_vm_dtb_arc(&vm_config) {
+        if let Some(dtb_arc) = get_vm_dtb_arc(&vm_config)
+            && let Some(dtb_load_gpa) = self.dtb_load_gpa
+        {
             let dtb_slice: &[u8] = &dtb_arc;
             debug!(
                 "DTB buffer addr: {:x}, size: {:#}",
-                self.dtb_load_gpa.unwrap(),
+                dtb_load_gpa,
                 Byte::from(dtb_slice.len())
             );
 
             #[cfg(target_arch = "aarch64")]
             update_fdt(
-                self.dtb_load_gpa.unwrap(),
+                dtb_load_gpa,
                 NonNull::new(dtb_slice.as_ptr() as *mut u8).unwrap(),
                 dtb_slice.len(),
                 self.vm.clone(),
@@ -254,17 +256,19 @@ mod fs {
         };
         // Load DTB image if needed.
         let vm_config = axvm::config::AxVMConfig::from(loader.config.clone());
-        if let Some(dtb_arc) = get_vm_dtb_arc(&vm_config) {
+        if let Some(dtb_arc) = get_vm_dtb_arc(&vm_config)
+            && let Some(dtb_load_gpa) = loader.dtb_load_gpa
+        {
             let dtb_slice: &[u8] = &dtb_arc;
             debug!(
                 "DTB buffer addr: {:x}, size: {:#}",
-                loader.dtb_load_gpa.unwrap(),
+                dtb_load_gpa,
                 Byte::from(dtb_slice.len())
             );
 
             #[cfg(target_arch = "aarch64")]
             update_fdt(
-                loader.dtb_load_gpa.unwrap(),
+                dtb_load_gpa,
                 NonNull::new(dtb_slice.as_ptr() as *mut u8).unwrap(),
                 dtb_slice.len(),
                 loader.vm.clone(),