[coreboot] are the pci devices scanned two rounds?

[王思源]

it seems that the pci devices are scanned two rounds in our mainboard.
first round: bus 0 -> bridge 00:14.4 -> bus 1 (this is the vga device
under the bridge 00:14.4)
second round: bus 0 -> bridge 00:02.0 -> bridge 00:04.0 -> bridge
00:05.0. this bridges are all pcie bridges.

I want to know whether the two rounds scanning style is right. if it
is designed to scan two rounds, why?
any reply is helpful to me.
thank you!


the log is shown as fallow, the message unrelated to pci is cut.

scan_static_bus for Root Device
APIC_CLUSTER: 0 enabled
PCI_DOMAIN: 0000 enabled
APIC_CLUSTER: 0 scanning...
PCI: 00:18.5 family15h, core_max=0x10, core_nums=0xf, siblings=0x7
lpaicid_start=0x10 node 0x0 core 0x0 apicid=0x10
CPU: APIC: 10 enabled
lpaicid_start=0x10 node 0x0 core 0x1 apicid=0x11
CPU: APIC: 11 enabled
lpaicid_start=0x10 node 0x0 core 0x2 apicid=0x12
CPU: APIC: 12 enabled
lpaicid_start=0x10 node 0x0 core 0x3 apicid=0x13
CPU: APIC: 13 enabled
lpaicid_start=0x10 node 0x0 core 0x4 apicid=0x14
CPU: APIC: 14 enabled
lpaicid_start=0x10 node 0x0 core 0x5 apicid=0x15
CPU: APIC: 15 enabled
lpaicid_start=0x10 node 0x0 core 0x6 apicid=0x16
CPU: APIC: 16 enabled
lpaicid_start=0x10 node 0x0 core 0x7 apicid=0x17
CPU: APIC: 17 enabled
PCI: 00:19.0 [1022/1600] bus ops
PCI: 00:19.0 [1022/1600] enabled
PCI: 00:19.1 [1022/1601] enabled
PCI: 00:19.2 [1022/1602] enabled
PCI: 00:19.3 [1022/1603] enabled
PCI: 00:19.4 [1022/1604] enabled
PCI: 00:19.5 [1022/1605] enabled
PCI: 00:19.5 family15h, core_max=0x10, core_nums=0xf, siblings=0x7
lpaicid_start=0x10 node 0x1 core 0x0 apicid=0x18
CPU: APIC: 18 enabled
lpaicid_start=0x10 node 0x1 core 0x1 apicid=0x19
CPU: APIC: 19 enabled
lpaicid_start=0x10 node 0x1 core 0x2 apicid=0x1a
CPU: APIC: 1a enabled
lpaicid_start=0x10 node 0x1 core 0x3 apicid=0x1b
CPU: APIC: 1b enabled
lpaicid_start=0x10 node 0x1 core 0x4 apicid=0x1c
CPU: APIC: 1c enabled
lpaicid_start=0x10 node 0x1 core 0x5 apicid=0x1d
CPU: APIC: 1d enabled
lpaicid_start=0x10 node 0x1 core 0x6 apicid=0x1e
CPU: APIC: 1e enabled
lpaicid_start=0x10 node 0x1 core 0x7 apicid=0x1f
CPU: APIC: 1f enabled
PCI_DOMAIN: 0000 scanning...
PCI: pci_scan_bus for bus 00
PCI: 00:00.0 [1002/5a10] ops
PCI: 00:00.0 [1002/5a10] enabled
PCI: 00:11.0 [1002/4390] ops
PCI: 00:11.0 [1002/4390] enabled
PCI: 00:12.0 [1002/4397] ops
PCI: 00:12.0 [1002/4397] enabled
PCI: 00:12.1 [1002/4398] ops
PCI: 00:12.1 [1002/4398] enabled
PCI: 00:12.2 [1002/4396] ops
PCI: 00:12.2 [1002/4396] enabled
PCI: 00:13.0 [1002/4397] ops
PCI: 00:13.0 [1002/4397] enabled
PCI: 00:13.1 [1002/4398] ops
PCI: 00:13.1 [1002/4398] enabled
PCI: 00:13.2 [1002/4396] ops
PCI: 00:13.2 [1002/4396] enabled
PCI: 00:14.0 [1002/4385] enabled
PCI: 00:14.1 [1002/439c] enabled
PCI: 00:14.2 [1002/4383] ops
PCI: 00:14.2 [1002/4383] enabled
PCI: 00:14.3 [1002/439d] bus ops
PCI: 00:14.3 [1002/439d] enabled
PCI: 00:14.4 [1002/4384] bus ops
PCI: 00:14.4 [1002/4384] enabled
PCI: 00:14.5 [1002/4399] ops
PCI: 00:14.5 [1002/4399] enabled
PCI: 00:18.0 [1022/1600] bus ops
PCI: 00:18.0 [1022/1600] enabled
PCI: 00:18.1 [1022/1601] enabled
PCI: 00:18.2 [1022/1602] enabled
PCI: 00:18.3 [1022/1603] enabled
PCI: 00:18.4 [1022/1604] enabled
PCI: 00:18.5 [1022/1605] enabled
PCI: 00:19.0 [1022/1600] enabled
PCI: 00:19.1 [1022/1601] enabled
PCI: 00:19.2 [1022/1602] enabled
PCI: 00:19.3 [1022/1603] enabled
PCI: 00:19.4 [1022/1604] enabled
PCI: 00:19.5 [1022/1605] enabled
scan_static_bus for PCI: 00:14.3
scan_static_bus for PCI: 00:14.3 done
do_pci_scan_bridge for PCI: 00:14.4
PCI: pci_scan_bus for bus 01
PCI: Using configuration type 1
PCI: 01:00.0 [1a03/2000] enabled
PCI: pci_scan_bus returning with max=001
do_pci_scan_bridge returns max 1
PCI: pci_scan_bus for bus 00
rd890_enable  Bus-0 Dev-0 Fun-0, enable=1

[NBPCIE]  PortId 02 LinkState = 0x0
[NBPCIE]  PortId 04 LinkState = 0x0
[NBPCIE]  PortId 08 LinkState = 0x10
[NBPCIE]  PortId 09 LinkState = 0x10
[NBPCIE]  PortId 10 LinkState = 0x4
[NBPCIE]  PortId 11 LinkState = 0x0
[NBPCIE]  PortId 13 LinkState = 0x10
[NBPCIE]  PortId 02 LinkState = 0x0
[NBPCIE]  PortId 04 LinkState = 0x0
[NBPCIE]  PortId 08 LinkState = 0x10
[NBPCIE]  PortId 09 LinkState = 0x10
[NBPCIE]  PortId 10 LinkState = 0x4
[NBPCIE]  PortId 11 LinkState = 0x0
[NBPCIE]  PortId 13 LinkState = 0x10
PCI: 00:00.0 [1002/5a10] ops
PCI: 00:00.0 [1002/5a10] enabled
rd890_enable  Bus-0 Dev-0 Fun-1, enable=0
rd890_enable  Bus-0 Dev-2 Fun-0, enable=1

PCI: 00:02.0 subordinate bus PCI Express
PCI: 00:02.0 [1002/5a16] enabled
rd890_enable  Bus-0 Dev-3 Fun-0, enable=0
rd890_enable  Bus-0 Dev-4 Fun-0, enable=1

PCI: 00:04.0 subordinate bus PCI Express
PCI: 00:04.0 [1002/5a18] enabled
rd890_enable  Bus-0 Dev-5 Fun-0, enable=1

PCI: 00:05.0 subordinate bus PCI Express
PCI: 00:05.0 [1002/5a19] enabled
rd890_enable  Bus-0 Dev-6 Fun-0, enable=1

PCI: 00:06.0 subordinate bus PCI Express
PCI: 00:06.0 [1002/5a1a] enabled
rd890_enable  Bus-0 Dev-7 Fun-0, enable=1

PCI: 00:07.0 subordinate bus PCI Express
PCI: 00:07.0 [1002/5a1b] enabled
rd890_enable  Bus-0 Dev-8 Fun-0, enable=0
rd890_enable  Bus-0 Dev-9 Fun-0, enable=1

PCI: 00:09.0 subordinate bus PCI Express
PCI: 00:09.0 [1002/5a1c] enabled
rd890_enable  Bus-0 Dev-A Fun-0, enable=1

PCI: 00:0a.0 subordinate bus PCI Express
PCI: 00:0a.0 [1002/5a1d] enabled
rd890_enable  Bus-0 Dev-B Fun-0, enable=1

PCI: 00:0b.0 subordinate bus PCI Express
PCI: 00:0b.0 [1002/5a1f] enabled
rd890_enable  Bus-0 Dev-C Fun-0, enable=0
rd890_enable  Bus-0 Dev-D Fun-0, enable=1

PCI: 00:0d.0 subordinate bus PCI Express
PCI: 00:0d.0 [1002/5a1e] enabled
sb700_enable() SB700 - Cfg.c - sb700_cimx_config - Start.
SB700 - Cfg.c - sb700_cimx_config - End.
PCI: 00:11.0 [1002/4390] ops
PCI: 00:11.0 [1002/4390] enabled
sb700_enable() PCI: 00:12.0 [1002/4397] ops
PCI: 00:12.0 [1002/4397] enabled
sb700_enable() PCI: 00:12.1 [1002/4398] ops
PCI: 00:12.1 [1002/4398] enabled
sb700_enable() PCI: 00:12.2 [1002/4396] ops
PCI: 00:12.2 [1002/4396] enabled
sb700_enable() PCI: 00:13.0 [1002/4397] ops
PCI: 00:13.0 [1002/4397] enabled
sb700_enable() PCI: 00:13.1 [1002/4398] ops
PCI: 00:13.1 [1002/4398] enabled
sb700_enable() PCI: 00:13.2 [1002/4396] ops
PCI: 00:13.2 [1002/4396] enabled
sb700_enable() sm_init().
I
PCI: 00:14.0 [1002/4385] enabled
sb700_enable() PCI: 00:14.1 [1002/439c] disabled
sb700_enable() hda disabled
PCI: 00:14.2 [1002/4383] ops
PCI: 00:14.2 [1002/4383] disabled
sb700_enable() PCI: 00:14.3 [1002/439d] bus ops
PCI: 00:14.3 [1002/439d] enabled
sb700_enable() PCI: 00:14.4 [1002/4384] bus ops
PCI: 00:14.4 [1002/4384] enabled
sb700_enable() sb700 sb_Before_Pci_Init Start
SB700 - Late.c - sb700_callout_entry - Start.
SB700 - Late.c - sb700_callout_entry - End.
SB700 - Late.c - sb700_callout_entry - Start.
SB700 - Late.c - sb700_callout_entry - End.
sb700 sb_Before_Pci_Init End
PCI: 00:14.5 [1002/4399] ops
PCI: 00:14.5 [1002/4399] enabled
do_pci_scan_bridge for PCI: 00:02.0
PCI: pci_scan_bus for bus 01
PCI: 01:00.0 [1a03/2000] enabled
PCI: pci_scan_bus returning with max=001
Capability: type 0x01 @ 0x40
do_pci_scan_bridge returns max 1
do_pci_scan_bridge for PCI: 00:04.0
PCI: pci_scan_bus for bus 02
PCI: pci_scan_bus returning with max=002
do_pci_scan_bridge returns max 2
do_pci_scan_bridge for PCI: 00:05.0
PCI: pci_scan_bus for bus 03
PCI: pci_scan_bus returning with max=003
do_pci_scan_bridge returns max 3
do_pci_scan_bridge for PCI: 00:06.0
PCI: pci_scan_bus for bus 04
PCI: pci_scan_bus returning with max=004
do_pci_scan_bridge returns max 4
do_pci_scan_bridge for PCI: 00:07.0
PCI: pci_scan_bus for bus 05
PCI: pci_scan_bus returning with max=005
do_pci_scan_bridge returns max 5
do_pci_scan_bridge for PCI: 00:09.0
PCI: pci_scan_bus for bus 06
PCI: 06:00.0 [8086/10d3] enabled
PCI: pci_scan_bus returning with max=006
Capability: type 0x01 @ 0xc8
Capability: type 0x05 @ 0xd0
Capability: type 0x10 @ 0xe0
do_pci_scan_bridge returns max 6
do_pci_scan_bridge for PCI: 00:0a.0
PCI: pci_scan_bus for bus 07
PCI: pci_scan_bus returning with max=007
do_pci_scan_bridge returns max 7
do_pci_scan_bridge for PCI: 00:0b.0
PCI: pci_scan_bus for bus 08
PCI: pci_scan_bus returning with max=008
do_pci_scan_bridge returns max 8
do_pci_scan_bridge for PCI: 00:0d.0
PCI: pci_scan_bus for bus 09
PCI: 09:00.0 [8086/10c9] enabled
PCI: 09:00.1 [8086/10c9] enabled
PCI: pci_scan_bus returning with max=009

do_pci_scan_bridge returns max 9
scan_static_bus for PCI: 00:14.3
PNP: 002e.0 disabled
PNP: 002e.1 disabled
PNP: 002e.2 enabled
PNP: 002e.3 enabled
PNP: 002e.5 enabled
PNP: 002e.6 disabled
PNP: 002e.307 disabled
PNP: 002e.8 disabled
PNP: 002e.9 disabled
PNP: 002e.109 disabled
PNP: 002e.209 disabled
PNP: 002e.309 disabled
PNP: 002e.a disabled
PNP: 002e.b disabled
PNP: 002e.c disabled
PNP: 005e.0 enabled
scan_static_bus for PCI: 00:14.3 done
do_pci_scan_bridge for PCI: 00:14.4
PCI: pci_scan_bus for bus 0a
PCI: 0a:00.0 [1a03/2000] enabled
PCI: pci_scan_bus returning with max=00a
do_pci_scan_bridge returns max 10
PCI: pci_scan_bus returning with max=00a
PCI: pci_scan_bus returning with max=00a
scan_static_bus for Root Device done
done

-- 
WANG Siyuan