diff --git a/src/hulk/usb/xhci.d b/src/hulk/usb/xhci.d
index f012b89..c6c1eb2 100644
--- a/src/hulk/usb/xhci.d
+++ b/src/hulk/usb/xhci.d
@@ -353,14 +353,19 @@ struct XHCI
         m_runtime_registers = cast(RuntimeRegisters *)(base_address + m_capability_registers.rts_offset);
         m_doorbell_registers = cast(DoorbellRegister *)(base_address + m_capability_registers.doorbell_offset);
         dump_extended_capabilities();
-        if (reset())
-        {
-            Klog.writefln("XHCI controller initialization successful");
-        }
-        else
+        if (!reset())
         {
             Klog.writefln("XHCI controller failed to initialize");
+            return;
         }
+        /* TODO: write dcbaap. */
+        /* TODO: write cr_ctrl. */
+        /+ TODO:
+        m_operational_registers.config = volatileLoad(&m_capability_registers.hcs_params1) & 0xFu;
+        m_operational_registers.dn_ctrl = 1u << 1u;
+        +/
+        /* TODO: set up interrupt register set. */
+        Klog.writefln("XHCI controller initialization successful");
     }
 
     private void dump_extended_capabilities()