diff --git a/kernel/driver/usb/xhci/xhci.c b/kernel/driver/usb/xhci/xhci.c
index 5ddcdcd8..33185c39 100644
--- a/kernel/driver/usb/xhci/xhci.c
+++ b/kernel/driver/usb/xhci/xhci.c
@@ -1323,6 +1323,7 @@ static int xhci_get_descriptor(const int id, const int port_id)
      */
     struct xhci_TRB_normal_t trb = {0};
     trb.TRB_type = TRB_TYPE_ENABLE_SLOT;
+    kdebug("to enable slot");
     if (xhci_send_command(id, (struct xhci_TRB_t *)&trb, true) != 0)
     {
         kerror("portid:%d: send enable slot failed", port_id);
@@ -1348,17 +1349,19 @@ static int xhci_get_descriptor(const int id, const int port_id)
             break;
         }
     }
-    kdebug("to init slot");
+
+
+    kdebug("speed=%d", speed);
     // 初始化接口的上下文
     uint64_t slot_vaddr = xhci_initialize_slot(id, slot_id, port_id, speed, max_packet);
+    kdebug("set addr");
 
-    kdebug("to set address");
     // 发送 address_device命令
     retval = xhci_set_address(id, slot_vaddr, slot_id, true);
     if (retval != 0)
         return retval;
+    kdebug("crtl in");
 
-    kdebug("to ctrl in");
     // 发送用于 “get_descriptor” 的数据包。
     count = xhci_control_in(id, &dev_desc, 8, slot_id, max_packet);
     if (unlikely(count == 0))
@@ -1370,17 +1373,21 @@ static int xhci_get_descriptor(const int id, const int port_id)
           evaluate_slot_context call.
     */
 
+    kdebug("reset port");
     // 重置当前端口
     kdebug("to reset");
     xhci_reset_port(id, port_id);
 
+    kdebug("set addr again");
     // 再次发送 set_address命令
     kdebug("to set addr again");
     retval = xhci_set_address(id, slot_vaddr, slot_id, false);
     if (retval != 0)
         return retval;
 
-    kdebug("to ctrl in again");
+
+    kdebug("ctrl in again");
+
     count = xhci_control_in(id, &dev_desc, 18, slot_id, max_packet);
     if (unlikely(count == 0))
         return -EAGAIN;
@@ -1447,14 +1454,17 @@ static int xhci_hc_start_ports(int id)
         {
             // kdebug("initializing usb2: %d", i);
             // reset该端口
+            kdebug("to reset port %d, rflags=%#018lx", id, get_rflags());
             if (likely(xhci_reset_port(id, i) == 0)) // 如果端口reset成功，就获取它的描述符
                                                      // 否则，reset函数会把它给设置为未激活，并且标志配对的usb2端口是激活的
             {
-                // kdebug("reset ok");
+                kdebug("reset port %d ok", id);
+
                 if (xhci_get_descriptor(id, i) == 0)
                     ++cnt;
                 else
                     break;
+                kdebug("port %d get desc ok", id);
             }
         }
     }
diff --git a/kernel/smp/smp.c b/kernel/smp/smp.c
index 87da3a92..d2a80203 100644
--- a/kernel/smp/smp.c
+++ b/kernel/smp/smp.c
@@ -35,7 +35,6 @@ void smp_init()
         proc_local_apic_structs[i] = (struct acpi_Processor_Local_APIC_Structure_t *)(tmp_vaddr[i]);
     }
 
-    //*(uchar *)0x20000 = 0xf4; // 在内存的0x20000处写入HLT指令(AP处理器会执行物理地址0x20000的代码)
     // 将引导程序复制到物理地址0x20000处
     memcpy((unsigned char *)phys_2_virt(0x20000), _apu_boot_start, (unsigned long)&_apu_boot_end - (unsigned long)&_apu_boot_start);
     io_mfence();
@@ -135,11 +134,7 @@ void smp_ap_start()
                          : "memory");
     __asm__ __volatile__("movq %0, %%rsp \n\t" ::"m"(cpu_core_info[current_starting_cpu].stack_start)
                          : "memory");
-    /*
-        __asm__ __volatile__("movq %0, %%rbp \n\t" ::"m"(stack_start)
-                             : "memory");
-        __asm__ __volatile__("movq %0, %%rsp \n\t" ::"m"(stack_start)
-                             : "memory");*/
+
     ksuccess("AP core successfully started!");
     io_mfence();
     ++num_cpu_started;
@@ -183,10 +178,6 @@ void smp_ap_start()
     while (1)
         hlt();
 
-    /*
-        if (proc_current_cpu_id == 1)
-            process_init();
-            */
     while (1)
     {
         printk_color(BLACK, WHITE, "CPU:%d IDLE process.\n", proc_current_cpu_id);