Index: uspace/drv/bus/usb/xhci/commands.c
===================================================================
--- uspace/drv/bus/usb/xhci/commands.c	(revision 5ac5eb1755bd526b807249739af614929831d5a4)
+++ uspace/drv/bus/usb/xhci/commands.c	(revision 8db42f7828502ac1c219d996ac4a2e17d76dc51d)
@@ -41,4 +41,5 @@
 #include "debug.h"
 #include "hc.h"
+#include "hw_struct/context.h"
 #include "hw_struct/trb.h"
 
@@ -96,4 +97,33 @@
 }
 
+int xhci_send_address_device_command(xhci_hc_t *hc, uint32_t slot_id,
+				     xhci_input_ctx_t *ictx)
+{
+	/**
+	 * TODO: Requirements for this command:
+	 *           dcbaa[slot_id] is properly sized and initialized
+	 *           ictx has valids slot context and endpoint 0, all
+	 *           other should be ignored at this point (see section 4.6.5).
+	 */
+	xhci_trb_t trb;
+	memset(&trb, 0, sizeof(trb));
+
+	uint64_t phys_addr = (uint64_t) addr_to_phys(ictx);
+	trb.parameter = host2xhci(32, phys_addr & 0xFFFFFFFFFFFFFFF0);
+
+	/**
+	 * Note: According to section 6.4.3.4, we can set the 9th bit
+	 *       of the control field of the trb (BSR) to 1 and then the xHC
+	 *       will not issue the SET_ADDRESS request to the USB device.
+	 *       This can be used to provide compatibility with legacy USB devices
+	 *       that require their device descriptor to be read before such request.
+	 */
+	trb.control = host2xhci(32, XHCI_TRB_TYPE_ADDRESS_DEVICE_CMD << 10);
+	trb.control |= host2xhci(32, hc->command_ring.pcs);
+	trb.control |= host2xhci(32, slot_id << 24);
+
+	return enqueue_trb(hc, &trb, 0, 0);
+}
+
 int xhci_handle_command_completion(xhci_hc_t *hc, xhci_trb_t *trb)
 {
@@ -123,4 +153,13 @@
 		//       data structures once it's implemented.
 		break;
+	case XHCI_TRB_TYPE_ADDRESS_DEVICE_CMD:
+		if (code == XHCI_TRBC_SLOT_NOT_ENABLED_ERROR)
+			usb_log_debug2("Slot to be addressed was not enabled.");
+		else if (code == XHCI_TRBC_CONTEXT_STATE_ERROR)
+			usb_log_debug2("Slot to be addressed is not in enabled or default state.");
+		else if (code == XHCI_TRBC_USB_TRANSACTION_ERROR)
+			usb_log_debug2("SET_ADDRESS request to the USB device failed.");
+		// TODO: Call set address callback when it's implemented.
+		break;
 	default:
 		usb_log_debug2("Unsupported command trb.");
Index: uspace/drv/bus/usb/xhci/commands.h
===================================================================
--- uspace/drv/bus/usb/xhci/commands.h	(revision 5ac5eb1755bd526b807249739af614929831d5a4)
+++ uspace/drv/bus/usb/xhci/commands.h	(revision 8db42f7828502ac1c219d996ac4a2e17d76dc51d)
@@ -39,8 +39,10 @@
 typedef struct xhci_hc xhci_hc_t;
 typedef struct xhci_trb xhci_trb_t;
+typedef struct xhci_input_ctx xhci_input_ctx_t;
 
 int xhci_send_no_op_command(xhci_hc_t *);
 int xhci_send_enable_slot_command(xhci_hc_t *);
 int xhci_send_disable_slot_command(xhci_hc_t *, uint32_t);
+int xhci_send_address_device_command(xhci_hc_t *, uint32_t, xhci_input_ctx_t *);
 
 int xhci_handle_command_completion(xhci_hc_t *, xhci_trb_t *);