diff -r 3da6885cee9d configs/common/FSConfig.py
--- a/configs/common/FSConfig.py	Fri Jun 13 16:48:47 2014 +0800
+++ b/configs/common/FSConfig.py	Wed Jun 18 09:28:51 2014 +0800
@@ -338,14 +338,15 @@
     x86_sys.bridge = Bridge(delay='50ns')
     x86_sys.bridge.master = x86_sys.iobus.slave
     x86_sys.bridge.slave = x86_sys.membus.master
-    # Allow the bridge to pass through the IO APIC (two pages),
-    # everything in the IO address range up to the local APIC, and
-    # then the entire PCI address space and beyond
+    # Allow the bridge to pass through:
+    #  1) kernel configured PCI device memory map address (range of [mem_size+1, 4GB)),
+    #  2) the bridge to pass through the IO APIC (two pages, already contained in 1),
+    #  3) everything in the IO address range up to the local APIC, and
+    #  4) then the entire PCI address space and beyond
     x86_sys.bridge.ranges = \
         [
-        AddrRange(x86_sys.pc.south_bridge.io_apic.pio_addr,
-                  x86_sys.pc.south_bridge.io_apic.pio_addr +
-                  APIC_range_size - 1),
+        AddrRange(x86_sys.mem_ranges[0].end + 1,
+                  0xFFFFFFFF),
         AddrRange(IO_address_space_base,
                   interrupts_address_space_base - 1),
         AddrRange(pci_config_address_space_base,
@@ -423,6 +424,17 @@
     disk2.childImage(disk('linux-bigswap2.img'))
     self.pc.south_bridge.ide.disks = [disk0, disk2]
 
+    # Ethernet
+    #  - connect to PCI bus (bus_id=0)
+    #  - connect to I/O APIC use INT-A (InterruptPin=1)
+    #  - use IRQ#10 (open for the use of peripherals)
+    #    - ref http://http://en.wikipedia.org/wiki/Interrupt_request#x86_IRQs
+    self.pc.ethernet = IGbE_e1000(pci_bus=0, pci_dev=2, pci_func=0,
+                                  InterruptLine=10, InterruptPin=1)
+    self.pc.ethernet.pio = self.iobus.master
+    self.pc.ethernet.config = self.iobus.master
+    self.pc.ethernet.dma = self.iobus.slave
+
     # Add in a Bios information structure.
     structures = [X86SMBiosBiosInformation()]
     self.smbios_table.structures = structures
@@ -444,18 +456,21 @@
             address = 0xfec00000)
     self.pc.south_bridge.io_apic.apic_id = io_apic.id
     base_entries.append(io_apic)
-    isa_bus = X86IntelMPBus(bus_id = 0, bus_type='ISA')
+    # In gem5 Pc::calcPciConfigAddr(), it required "assert(bus==0)",
+    # but linux kernel cannot config PCI device if it was not connected to PCI bus,
+    # so we fix PCI bus id to 0, and ISA bus id to 1.
+    pci_bus = X86IntelMPBus(bus_id = 0, bus_type='PCI')
+    base_entries.append(pci_bus)
+    isa_bus = X86IntelMPBus(bus_id = 1, bus_type='ISA')
     base_entries.append(isa_bus)
-    pci_bus = X86IntelMPBus(bus_id = 1, bus_type='PCI')
-    base_entries.append(pci_bus)
-    connect_busses = X86IntelMPBusHierarchy(bus_id=0,
-            subtractive_decode=True, parent_bus=1)
+    connect_busses = X86IntelMPBusHierarchy(bus_id=1,
+            subtractive_decode=True, parent_bus=0)
     ext_entries.append(connect_busses)
     pci_dev4_inta = X86IntelMPIOIntAssignment(
             interrupt_type = 'INT',
             polarity = 'ConformPolarity',
             trigger = 'ConformTrigger',
-            source_bus_id = 1,
+            source_bus_id = 0,
             source_bus_irq = 0 + (4 << 2),
             dest_io_apic_id = io_apic.id,
             dest_io_apic_intin = 16)
@@ -465,7 +480,7 @@
                 interrupt_type = 'ExtInt',
                 polarity = 'ConformPolarity',
                 trigger = 'ConformTrigger',
-                source_bus_id = 0,
+                source_bus_id = 1,
                 source_bus_irq = irq,
                 dest_io_apic_id = io_apic.id,
                 dest_io_apic_intin = 0)
@@ -474,7 +489,7 @@
                 interrupt_type = 'INT',
                 polarity = 'ConformPolarity',
                 trigger = 'ConformTrigger',
-                source_bus_id = 0,
+                source_bus_id = 1,
                 source_bus_irq = irq,
                 dest_io_apic_id = io_apic.id,
                 dest_io_apic_intin = apicPin)