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当我的计算机模块 (Adlink comExpressBT) 启动 Linux 4.4.3 时，我收到以下错误，该错误对应于 PnP 故障，阻止了 SMBus 驱动程序加载：（仅供参考 - SMBus 用于 I2C 接口）

Oct 27 01:22:28 buildroot kern.info kernel: [    5.701720] i2c /dev entries driver
Oct 27 01:22:28 buildroot kern.warn kernel: [    5.709082] ACPI Warning: SystemIO range 0x000000000000E000-0x000000000000E01F conflicts with OpRegion 0x000000000000E000-0x000000000000E00F (\_SB_.PCI0.SBUS.SMBI) (20150930/utaddress-254)
Oct 27 01:22:28 buildroot kern.info kernel: [    5.742765] ACPI: If an ACPI driver is available for this device, you should use it instead of the native driver

我从 Buildroot 中删除了 ACPI（和 acpid），然后加载了 SMBus 驱动程序。但是，对于我们正在使用的映射 RAM 的定制 PCIe FPGA，PnP 失败了。未正确读取 MSI 功能，导致以下情况：

Oct 31 22:06:25 buildroot kern.crit kernel: [  478.997584] /dev/dcb: initialising
Oct 31 22:06:25 buildroot kern.warn kernel: [  479.007245] pci_drv_DCB 0000:01:00.0: using bridge 0000:00:1c.0 INT A to get IRQ 16
Oct 31 22:06:25 buildroot kern.info kernel: [  479.025554] pci_drv_DCB 0000:01:00.0: PCI->APIC IRQ transform: INT A -> IRQ 16
Oct 31 22:06:25 buildroot kern.info kernel: [  479.043131] pci_drv_DCB 0000:01:00.0: enabling device (0000 -> 0002)
Oct 31 22:06:25 buildroot kern.crit kernel: [  479.059059] pci_DCB: memstart=0x0, memlen=0x0
Oct 31 22:06:25 buildroot kern.err kernel: [  479.070813] Memory address conflict for device "0000:01:00.0", request_mem_region( memstart=0x0, memlen=0x0 ) failed.
Oct 31 22:06:25 buildroot kern.warn kernel: [  479.095176] Unable to request memory for device.
Oct 31 22:06:25 buildroot kern.warn kernel: [  479.107604] pci_drv_DCB: probe of 0000:01:00.0 failed with error -12**

尽管区域地址看起来不错，但无法正确读取 MSI 功能：（来自“lspci -vvv”）

01:00.0 RAM memory: Xilinx Corporation Default PCIe endpoint ID
    Subsystem: Xilinx Corporation Default PCIe endpoint ID
    Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
    Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
    Interrupt: pin A routed to IRQ 0
    Region 0: Memory at b0700000 (64-bit, non-prefetchable) [size=64K]
    Expansion ROM at b0600000 [disabled] [size=1M]
    Capabilities: [40] Power Management version 3
            Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0+,D1-,D2-,D3hot-,D3cold-)
            Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME
    Capabilities: [48] MSI: Enable- Count=1/1 Maskable+ 64bit+
            Address: 0000000000000000  Data: 0000
            Masking: 00000000  Pending: 00000000**
    Capabilities: [60] Express (v1) Endpoint, MSI 00
            DevCap: MaxPayload 512 bytes, PhantFunc 1, Latency L0s unlimited, L1 unlimited
                    ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset- SlotPowerLimit 10.000W
            DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
                    RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop+
                    MaxPayload 128 bytes, MaxReadReq 512 bytes
            DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-
            LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s, Exit Latency L0s unlimited, L1 unlimited
                    ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp-
            LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
                    ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
            LnkSta: Speed 2.5GT/s, Width x1, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-

看来我必须在某种程度上启用 ACPI 才能使 PnP-PCI 发现正常工作。有任何想法吗？提前致谢。——罗斯·R。

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