how to understand pci section in device tree source file

[zhanglei459 <zhanglei459@gmail.com>]

Hi,all.
    I have confused for pci section in dts file some days.And I have
searched open firmware or device tree in goole.But little found.So I send
this mail and want to know some details about device tree source file,such
as ethernet link or docments.
    Now I have a customed pci video card ,which is based on fujitsu mb86297
chip.I want to make it work on Windrver SBC8548E eval board.I have ported
u-boot and it works well.But when I run linux on eval board,linux can't
probe mb86297 chip.Below is pci section of dts file:
		pci@8000 {
			interrupt-map-mask = <f800 0 0 7>;
			interrupt-map = <

				/* IDSEL 0x11 AD17*/
				8800 0 0 1 &mpic 2 1
				8800 0 0 2 &mpic 3 1
				8800 0 0 3 &mpic 4 1
				8800 0 0 4 &mpic 5 1>;

			interrupt-parent = <&mpic>;
			interrupts = <19 2>;
			bus-range = <0 0>;
			ranges = <02000000 0 90000000 90000000 0 10000000
				  01000000 0 00000000 e2800000 0 00800000>;
			clock-frequency = <3f940aa>;
			#interrupt-cells = <1>;
			#size-cells = <2>;
			#address-cells = <3>;
			reg = <8000 1000>;
			compatible = "fsl,mpc8540-pci";
			device_type = "pci";
		};
I guess  which refer to host-pci bridge ATMU,is right?But how to descripe
added-on pci chip,whose BAR0 and BAR1 are IO spaces, BAR2 and BAR3  are MEM
spaces.
Below is fragment of linux boot info:
......
mpc85xx_cds_setup_arch()

CDS Version = 0xf8 in slot 4



Found FSL PCI host bridge at 0x00000000e0008000.Firmware bus number: 0->0

PCI: MEM[0] 0x80000000 -> 0x9fffffff

PCI: IO 0x0 -> 0x7fffff

arch: exit

Zone PFN ranges:

  DMA             0 ->    65536

  Normal      65536 ->    65536

Movable zone start PFN for each node

early_node_map[1] active PFN ranges

    0:        0 ->    65536

Built 1 zonelists in Zone order.  Total pages: 65024

Kernel command line: root=/dev/ram rw console=ttyS1,57600

mpic: Setting up MPIC " OpenPIC  " version 1.2 at e0040000, max 1 CPUs

mpic: ISU size: 80, shift: 7, mask: 7f

mpic: Initializing for 80 sources

PID hash table entries: 1024 (order: 10, 4096 bytes)

Dentry cache hash table entries: 32768 (order: 5, 131072 bytes)

Inode-cache hash table entries: 16384 (order: 4, 65536 bytes)

Memory: 250044k/262144k available (3364k kernel code, 11776k reserved, 124k
data, 119k bss, 164k init)

Mount-cache hash table entries: 512

NET: Registered protocol family 16

             

PCI: Probing PCI hardware

pci_busdev_to_OF_node(0,0x0)

 parent is /soc8548@e0000000/pci@8000

 result is <NULL>

PCI->OF bus map:

0 -> 0

PCI: bridge rsrc 0..7fffff (100), parent c034d33c

PCI: bridge rsrc 80000000..9fffffff (1200), parent c034d358
 
........

Hope advice,Thank you advance.
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