以下是问题描述：
Linux启动后，运行命令“lspci-v”，我们可以看到PCI设备可以找到，但是没有为设备分配地址。通过进一步检查linux引导消息，可以发现许多类似“bridge window mem…”的消息。不确定这些消息是否正常，或者实际上是地址分配失败的迹象。
我运行的处理器是freescale p2010，它是powerpc架构。bootloader是我们自己设计的，与pci无关。所以我们完全依赖linux内核自己完成pci枚举。
在linux内核pci枚举开始之前，我们所做的唯一事情就是为pci空间使用配置一个law窗口（特别是law4）。此外，当然，根据我们的硬件配置对dts文件进行适当的修改。我们认为，在所有这些准备工作完成之后，linux内核应该能够使所有pci工作正常，但是，它没有。
那么，是否有人知道如何解决这个问题，或者曾经遇到过类似的问题，并能对此有所启发？
非常感谢！
更多信息如下：
=kernel引导参数===============
root=/dev/ram rw ip=off console=ttyS0,9600
在DTS中设置PCI节=======
pci0: pcie@fbf0a000 {
interrupt-map-mask = <0xf800 0x0 0x0 0x7>;
interrupt-map = <
00000 0x0 0x0 0x1 &mpic 0x0 0x1
00000 0x0 0x0 0x2 &mpic 0x1 0x1
00000 0x0 0x0 0x3 &mpic 0x2 0x1
00000 0x0 0x0 0x4 &mpic 0x3 0x1>;
interrupt-parent = <&mpic>;
interrupts = <26 2>;
bus-range = <0 255>;
ranges = <0x2000000 0x0 0x80000000 0x80000000 0x0 0x40000000
0x1000000 0x0 0x0 0xd3000000 0x0 0x100000>;
clock-frequency = <33333333>;
#interrupt-cells = <1>;
#size-cells = <2>;
#address-cells = <3>;
reg = <0xfbf0a000 0x1000>;
compatible = "fsl,mpc8548-pcie";
device_type = "pci";
fsl,pcie-access-big-endian;
pcie@0 {
reg = <0x0 0x0 0x0 0x0 0x0>;
#size-cells = <2>;
#address-cells = <3>;
device_type = "pci";
ranges = <0x2000000 0x0 0x80000000
0x2000000 0x0 0x80000000
0x0 0x40000000
0x1000000 0x0 0x0
0x1000000 0x0 0x0
0x0 0x100000>;
};
};
=lspci-v的结果===============
# lspci -v
0000:00:00.0 Class 0b20: 1957:007b (rev 21)
!!! Invalid class 0b20 for header type 01
Flags: bus master, fast devsel, latency 0
Memory at <ignored> (32-bit, non-prefetchable)
Bus: primary=00, secondary=01, subordinate=07, sec-latency=0
I/O behind bridge: 00000000-00000fff
Memory behind bridge: 00000000-000fffff
Prefetchable memory behind bridge: 0000000000000000-0000000000000000
Capabilities: [44] Power Management version 2
Capabilities: [4c] #10 [0041]
0000:01:00.0 Class 0604: 10b5:8606 (rev ba)
Flags: bus master, fast devsel, latency 0
Bus: primary=01, secondary=02, subordinate=07, sec-latency=0
Capabilities: [40] Power Management version 3
Capabilities: [48] Message Signalled Interrupts: 64bit+ Queue=0/2 Enable+
Capabilities: [68] #10 [0052]
Capabilities: [a4] #0d [0000]
0000:02:01.0 Class 0604: 10b5:8606 (rev ba)
Flags: bus master, fast devsel, latency 0
Bus: primary=02, secondary=03, subordinate=03, sec-latency=0
Capabilities: [40] Power Management version 3
Capabilities: [48] Message Signalled Interrupts: 64bit+ Queue=0/2 Enable+
Capabilities: [68] #10 [0162]
Capabilities: [a4] #0d [0000]
0000:02:04.0 Class 0604: 10b5:8606 (rev ba)
Flags: bus master, fast devsel, latency 0
Bus: primary=02, secondary=04, subordinate=04, sec-latency=0
Capabilities: [40] Power Management version 3
Capabilities: [48] Message Signalled Interrupts: 64bit+ Queue=0/2 Enable+
Capabilities: [68] #10 [0162]
Capabilities: [a4] #0d [0000]
0000:02:05.0 Class 0604: 10b5:8606 (rev ba)
Flags: bus master, fast devsel, latency 0
Bus: primary=02, secondary=05, subordinate=05, sec-latency=0
Capabilities: [40] Power Management version 3
Capabilities: [48] Message Signalled Interrupts: 64bit+ Queue=0/2 Enable+
Capabilities: [68] #10 [0162]
Capabilities: [a4] #0d [0000]
0000:02:07.0 Class 0604: 10b5:8606 (rev ba)
Flags: bus master, fast devsel, latency 0
Bus: primary=02, secondary=06, subordinate=06, sec-latency=0
Capabilities: [40] Power Management version 3
Capabilities: [48] Message Signalled Interrupts: 64bit+ Queue=0/2 Enable+
Capabilities: [68] #10 [0162]
Capabilities: [a4] #0d [0000]
0000:02:09.0 Class 0604: 10b5:8606 (rev ba)
Flags: bus master, fast devsel, latency 0
Bus: primary=02, secondary=07, subordinate=07, sec-latency=0
Capabilities: [40] Power Management version 3
Capabilities: [48] Message Signalled Interrupts: 64bit+ Queue=0/2 Enable+
Capabilities: [68] #10 [0162]
Capabilities: [a4] #0d [0000]
0000:03:00.0 Class 0580: 10ee:7011
Subsystem: 10ee:0007
Flags: fast devsel, IRQ 17
Capabilities: [40] Power Management version 3
Capabilities: [48] Message Signalled Interrupts: 64bit+ Queue=0/0 Enable-
Capabilities: [60] #10 [0002]
0000:04:00.0 Class 0580: 10ee:7011
Subsystem: 10ee:0007
Flags: fast devsel, IRQ 16
Capabilities: [40] Power Management version 3
Capabilities: [48] Message Signalled Interrupts: 64bit+ Queue=0/0 Enable-
Capabilities: [60] #10 [0002]
0000:05:00.0 Class 0200: 14e4:8372 (rev 13)
Subsystem: 14e4:8372
Flags: fast devsel, IRQ 17
Memory at <ignored> (64-bit, non-prefetchable)
Capabilities: [48] Power Management version 3
Capabilities: [50] Vital Product Data
Capabilities: [58] Message Signalled Interrupts: 64bit+ Queue=0/3 Enable-
Capabilities: [ac] #10 [0002]
0000:06:00.0 Class 0200: 14e4:8372 (rev 13)
Subsystem: 14e4:8372
Flags: fast devsel, IRQ 18
Memory at <ignored> (64-bit, non-prefetchable)
Capabilities: [48] Power Management version 3
Capabilities: [50] Vital Product Data
Capabilities: [58] Message Signalled Interrupts: 64bit+ Queue=0/3 Enable-
Capabilities: [ac] #10 [0002]
#
=Linux内核启动消息====================
irq: irq 47 on host /soc@fbf00000/pic@40000 mapped to virtual irq 47
PCI: Probing PCI hardware
pci 0000:00:00.0: ignoring class b20 (doesn't match header type 01)
pci 0000:00:00.0: supports D1 D2
pci 0000:00:00.0: PME# supported from D0 D1 D2 D3hot D3cold
pci 0000:00:00.0: PME# disabled
pci 0000:01:00.0: reg 10: [mem 0x00000000-0x0001ffff]
pci 0000:01:00.0: PME# supported from D0 D3hot D3cold
pci 0000:01:00.0: PME# disabled
pci 0000:00:00.0: PCI bridge to [bus 01-ff]
pci 0000:00:00.0: bridge window [io 0x0000-0x0000] (disabled)
pci 0000:00:00.0: bridge window [mem 0x00000000-0x000fffff] (disabled)
pci 0000:00:00.0: bridge window [mem 0x00000000-0x000fffff pref] (disabled)
irq: irq 0 on host /soc@fbf00000/pic@40000 mapped to virtual irq 16
pci 0000:02:01.0: PME# supported from D0 D3hot D3cold
pci 0000:02:01.0: PME# disabled
pci 0000:02:04.0: PME# supported from D0 D3hot D3cold
pci 0000:02:04.0: PME# disabled
pci 0000:02:05.0: PME# supported from D0 D3hot D3cold
pci 0000:02:05.0: PME# disabled
pci 0000:02:07.0: PME# supported from D0 D3hot D3cold
pci 0000:02:07.0: PME# disabled
pci 0000:02:09.0: PME# supported from D0 D3hot D3cold
pci 0000:02:09.0: PME# disabled
pci 0000:01:00.0: PCI bridge to [bus 02-ff]
pci 0000:01:00.0: bridge window [io 0xf000-0x0000] (disabled)
pci 0000:01:00.0: bridge window [mem 0xfff00000-0x000fffff] (disabled)
pci 0000:01:00.0: bridge window [mem 0xfff00000-0x000fffff pref] (disabled)
irq: irq 1 on host /soc@fbf00000/pic@40000 mapped to virtual irq 17
irq: irq 3 on host /soc@fbf00000/pic@40000 mapped to virtual irq 18
pci 0000:03:00.0: reg 10: [mem 0x00000000-0x00003fff]
pci 0000:03:00.0: PME# supported from D0 D1 D2 D3hot
pci 0000:03:00.0: PME# disabled
pci 0000:02:01.0: PCI bridge to [bus 03-ff]
pci 0000:02:01.0: bridge window [io 0xf000-0x0000] (disabled)
pci 0000:02:01.0: bridge window [mem 0xfff00000-0x000fffff] (disabled)
pci 0000:02:01.0: bridge window [mem 0xfff00000-0x000fffff pref] (disabled)
pci 0000:04:00.0: reg 10: [mem 0x00000000-0x00003fff]
pci 0000:04:00.0: PME# supported from D0 D1 D2 D3hot
pci 0000:04:00.0: PME# disabled
pci 0000:02:04.0: PCI bridge to [bus 04-ff]
pci 0000:02:04.0: bridge window [io 0xf000-0x0000] (disabled)
pci 0000:02:04.0: bridge window [mem 0xfff00000-0x000fffff] (disabled)
pci 0000:02:04.0: bridge window [mem 0xfff00000-0x000fffff pref] (disabled)
pci 0000:05:00.0: reg 10: [mem 0x80400000-0x8043ffff 64bit]
pci 0000:05:00.0: PME# supported from D0 D3hot D3cold
pci 0000:05:00.0: PME# disabled
pci 0000:02:05.0: PCI bridge to [bus 05-ff]
pci 0000:02:05.0: bridge window [io 0xf000-0x0000] (disabled)
pci 0000:02:05.0: bridge window [mem 0xfff00000-0x000fffff] (disabled)
pci 0000:02:05.0: bridge window [mem 0xfff00000-0x000fffff pref] (disabled)
pci 0000:06:00.0: reg 10: [mem 0x80500000-0x8053ffff 64bit]
pci 0000:06:00.0: PME# supported from D0 D3hot D3cold
pci 0000:06:00.0: PME# disabled
pci 0000:02:07.0: PCI bridge to [bus 06-ff]
pci 0000:02:07.0: bridge window [io 0xf000-0x0000] (disabled)
pci 0000:02:07.0: bridge window [mem 0xfff00000-0x000fffff] (disabled)
pci 0000:02:07.0: bridge window [mem 0xfff00000-0x000fffff pref] (disabled)
pci 0000:02:09.0: PCI bridge to [bus 07-ff]
pci 0000:02:09.0: bridge window [io 0xf000-0x0000] (disabled)
pci 0000:02:09.0: bridge window [mem 0xfff00000-0x000fffff] (disabled)
pci 0000:02:09.0: bridge window [mem 0xfff00000-0x000fffff pref] (disabled)
PCI: Cannot allocate resource region 0 of device 0000:05:00.0, will remap
PCI: Cannot allocate resource region 0 of device 0000:06:00.0, will remap
pci 0000:01:00.0: BAR 8: can't assign mem (size 0x400000)
pci 0000:01:00.0: BAR 0: can't assign mem (size 0x20000)
pci 0000:02:01.0: BAR 8: can't assign mem (size 0x100000)
pci 0000:02:04.0: BAR 8: can't assign mem (size 0x100000)
pci 0000:02:05.0: BAR 8: can't assign mem (size 0x100000)
pci 0000:02:07.0: BAR 8: can't assign mem (size 0x100000)
pci 0000:03:00.0: BAR 0: can't assign mem (size 0x4000)
pci 0000:02:01.0: PCI bridge to [bus 03-03]
pci 0000:02:01.0: bridge window [io disabled]
pci 0000:02:01.0: bridge window [mem disabled]
pci 0000:02:01.0: bridge window [mem pref disabled]
pci 0000:04:00.0: BAR 0: can't assign mem (size 0x4000)
pci 0000:02:04.0: PCI bridge to [bus 04-04]
pci 0000:02:04.0: bridge window [io disabled]
pci 0000:02:04.0: bridge window [mem disabled]
pci 0000:02:04.0: bridge window [mem pref disabled]
pci 0000:05:00.0: BAR 0: can't assign mem (size 0x40000)
pci 0000:02:05.0: PCI bridge to [bus 05-05]
pci 0000:02:05.0: bridge window [io disabled]
pci 0000:02:05.0: bridge window [mem disabled]
pci 0000:02:05.0: bridge window [mem pref disabled]
pci 0000:06:00.0: BAR 0: can't assign mem (size 0x40000)
pci 0000:02:07.0: PCI bridge to [bus 06-06]
pci 0000:02:07.0: bridge window [io disabled]
pci 0000:02:07.0: bridge window [mem disabled]
pci 0000:02:07.0: bridge window [mem pref disabled]
pci 0000:02:09.0: PCI bridge to [bus 07-07]
pci 0000:02:09.0: bridge window [io disabled]
pci 0000:02:09.0: bridge window [mem disabled]
pci 0000:02:09.0: bridge window [mem pref disabled]
pci 0000:01:00.0: PCI bridge to [bus 02-07]
pci 0000:01:00.0: bridge window [io disabled]
pci 0000:01:00.0: bridge window [mem disabled]
pci 0000:01:00.0: bridge window [mem pref disabled]
pci 0000:00:00.0: not setting up bridge for bus 0000:01
pci_bus 0000:00: resource 0 [io 0xffafd000-0xffbfcfff]
pci_bus 0000:00: resource 1 [mem 0x80000000-0xbfffffff]
Registering qe_ic with sysfs...
bio: create slab <bio-0> at 0
vgaarb: loaded
Generic PHY: Registered new driver
最佳答案
在我们的一个SuperMicro上：在下面启用以下BIOS选项：
高级->PCIE/PCI/PNP配置：
PCI PERR/SERR Support - Enabled - event log pci errors.
Above 4G Decoding - Enabled - 64bit O/S and many pcie devices.
SR-IOV Support - Enabled - Linux gets dmesg "no space for" errs.
首先是一个建议…
关于linux - 为什么没有将BAR地址分配给pci设备？，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/13618027/