当我的计算机模块（Adlink comExpressBT）引导Linux 4.4.3时，我收到以下错误，该错误对应于阻止SMBus驱动程序加载的PnP故障:(仅供参考 - 在I2C接口上使用SMBus）
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。然而，PnP然后失败了我们正在使用的定制PCIe FPGA，它映射RAM。未正确读取MSI功能，导致以下内容：
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**
虽然区域地址看起来不错，但无法正确读取MSI功能:(来自＆＃34; lspci -vvv＆＃34;）
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-
似乎我必须在某种程度上启用ACPI才能让PnP-PCI发现正常工作。有任何想法吗？提前致谢。 -Ross R。