diff --git a/hw/pass-through.c b/hw/pass-through.c
index 4a86309..7a6e8a8 100644
--- a/hw/pass-through.c
+++ b/hw/pass-through.c
@@ -3565,6 +3565,7 @@ struct pt_dev * register_real_device(PCIBus *e_bus,
     int free_pci_slot = -1;
     char *key, *val;
     int msi_translate;
+    int pci_boot;
 
     PT_LOG("Assigning real physical device %02x:%02x.%x ...\n",
         r_bus, r_dev, r_func);
@@ -3597,6 +3598,7 @@ struct pt_dev * register_real_device(PCIBus *e_bus,
     }
 
     msi_translate = direct_pci_msitranslate;
+    pci_boot = 0;
     while (opt) {
         if (get_next_keyval(&opt, &key, &val)) {
             PT_LOG("Error: unrecognized PCI assignment option \"%s\"\n", opt);
@@ -3618,6 +3620,19 @@ struct pt_dev * register_real_device(PCIBus *e_bus,
             else
                 PT_LOG("Error: unrecognized value for msitranslate=\n");
         }
+        else if (strcmp(key, "boot") == 0)
+            if (strcmp(val, "0") == 0 || strcmp(val, "no") == 0)
+            {
+                PT_LOG("Disable boot option\n");
+                pci_boot = 0;
+            }
+            else if (strcmp(val, "1") == 0 || strcmp(val, "yes") == 0)
+            {
+                PT_LOG("Enable boot option\n");
+                pci_boot = 1;
+            }
+            else
+                PT_LOG("Error: unrecognized value for boot=\n");
         else
             PT_LOG("Error: unrecognized PCI assignment option \"%s=%s\"\n", key, val);
 
@@ -3710,6 +3725,9 @@ struct pt_dev * register_real_device(PCIBus *e_bus,
             *(uint16_t *)(&assigned_device->dev.config[0x04]));
     }
 
+    if (pci_boot)
+        pt_register_bootable_device(e_devfn);
+
 out:
     PT_LOG("Real physical device %02x:%02x.%x registered successfuly!\n"
            "IRQ type = %s\n", r_bus, r_dev, r_func,
diff --git a/hw/pass-through.h b/hw/pass-through.h
index e86d311..cb5d3f4 100644
--- a/hw/pass-through.h
+++ b/hw/pass-through.h
@@ -384,5 +384,7 @@ static inline pciaddr_t pt_pci_base_addr(pciaddr_t base)
     return base & PCI_ADDR_MEM_MASK;
 }
 
+void pt_register_bootable_device(int e_devfn);
+
 #endif /* __PASSTHROUGH_H__ */
 
diff --git a/hw/pc.c b/hw/pc.c
index f0492c8..ca4995a 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -237,6 +237,14 @@ static int pc_boot_set(void *opaque, const char *boot_device)
     return(0);
 }
 
+#ifdef CONFIG_PASSTHROUGH
+void pt_register_bootable_device(int e_devfn)
+{
+    RTCState *s = rtc_state;
+    rtc_set_memory(s, 0x60, e_devfn);
+}
+#endif
+
 /* hd_table must contain 4 block drivers */
 static void cmos_init(ram_addr_t ram_size, ram_addr_t above_4g_mem_size,
                       const char *boot_device, BlockDriverState **hd_table)
@@ -981,6 +989,8 @@ static void pc_init1(ram_addr_t ram_size, int vga_ram_size,
         }
     }
 
+    rtc_state = rtc_init(0x70, i8259[8]);
+
 #ifdef CONFIG_PASSTHROUGH
     /* Pass-through Initialization
      * init libpci even direct_pci is null, as can hotplug a dev runtime
@@ -996,8 +1006,6 @@ static void pc_init1(ram_addr_t ram_size, int vga_ram_size,
     }
 #endif
 
-    rtc_state = rtc_init(0x70, i8259[8]);
-
     qemu_register_boot_set(pc_boot_set, rtc_state);
 
     register_ioport_read(0x92, 1, 1, ioport92_read, NULL);