我们正在使用Xilinx Vivado在VC709 FPGA中开发一个带有自定义处理器、Microblaze和一些外围设备的系统。我们在"AXI桥接PCI express"中使用了两个"PCIe:BAR"。
最初，命令"lspci-vv"用于显示Ubuntu teminal中的内存区域。
$ lspci -vv
0a:00.0 Memory controller: Xilinx Corporation Device 7038 | 0a:00.0 Memory controller: Xilinx Corporation Device 7018
Subsystem: Xilinx Corporation Device 0007 | Subsystem: Xilinx Corporation Device 0008
Physical Slot: 3 | Physical Slot: 3
Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- Pa| Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- Pa
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-| Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
Interrupt: pin A routed to IRQ 16 | Interrupt: pin A routed to IRQ 16
Region 0: Memory at fbff0000 (32-bit, non-prefetchable) [size=| ----------------------------------------------------------------------
Region 1: Memory at fb800000 (32-bit, non-prefetchable) [size=| ----------------------------------------------------------------------
Capabilities: <access denied> | Capabilities: <access denied>
Kernel modules: riffa
我已经创建了该项目的副本，并在设计中编辑了一些内容(不幸的是，我不记得了(，现在"lspci-vv"的结果如下。请注意，区域0和地区1现已丢失。
$ lspci -vv
0a:00.0 Memory controller: Xilinx Corporation Device 7018
Subsystem: Xilinx Corporation Device 0008
Physical Slot: 3
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 16
Capabilities: <access denied>
Kernel modules: riffa
Q： 原因可能是什么？
注：
- 两个项目的块设计和连接完全相同
- 两个项目中的"PCI express Gen3.0子系统的AXI桥"选项相同
谢谢：(
社区需要的额外信息
$ sudo lspci -vv
0a:00.0 Memory controller: Xilinx Corporation Device 7018
Subsystem: Xilinx Corporation Device 0008
Physical Slot: 3
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 16
Capabilities: [80] 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: [90] MSI: Enable- Count=1/1 Maskable- 64bit+
Address: 0000000000000000 Data: 0000
Capabilities: [c0] Express (v2) Endpoint, MSI 00
DevCap: MaxPayload 512 bytes, PhantFunc 0, Latency L0s <64ns, L1 <1us
ExtTag- AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
DevCtl: Report errors: Correctable- Non-Fatal+ Fatal+ Unsupported-
RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
MaxPayload 128 bytes, MaxReadReq 4096 bytes
DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq+ AuxPwr- TransPend-
LnkCap: Port #0, Speed 2.5GT/s, Width x8, ASPM unknown, Latency L0 unlimited, L1 unlimited
ClockPM- Surprise- LLActRep- BwNot-
LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk+
ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
LnkSta: Speed 2.5GT/s, Width x4, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
DevCap2: Completion Timeout: Range B, TimeoutDis+
DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-
LnkCtl2: Target Link Speed: 2.5GT/s, EnterCompliance- SpeedDis-, Selectable De-emphasis: -6dB
Transmit Margin: Normal Operating Range, EnterModifiedCompliance- ComplianceSOS-
Compliance De-emphasis: -6dB
LnkSta2: Current De-emphasis Level: -6dB
Capabilities: [100 v2] Advanced Error Reporting
UESta: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq+ ACSViol-
UEMsk: DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq+ ACSViol-
UESvrt: DLP- SDES+ TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF- MalfTLP- ECRC- UnsupReq- ACSViol-
CESta: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
CEMsk: RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr-
AERCap: First Error Pointer: 00, GenCap- CGenEn- ChkCap- ChkEn-
Kernel modules: riffa$ sudo od -tx1z -Ax /proc/bus/pci/0a/00.0
000000 ee 10 38 70 43 00 10 00 00 00 80 05 10 00 00 00 >..8pC...........<
000010 00 00 ff fb 00 00 00 00 00 00 00 00 00 00 00 00 >................<
000020 00 00 00 00 00 00 00 00 00 00 00 00 ee 10 07 00 >................<
000030 00 00 00 00 80 00 00 00 00 00 00 00 0b 01 00 00 >................<
000040 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
000080 01 90 03 00 08 00 00 00 00 00 00 00 00 00 00 00 >................<
000090 05 c0 80 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
0000a0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
0000b0 11 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
0000c0 10 00 02 00 02 80 00 00 16 58 09 00 83 f0 43 00 >.........X....C.<
0000d0 40 00 42 10 00 00 00 00 00 00 00 00 00 00 00 00 >@.B.............<
0000e0 00 00 00 00 12 00 00 00 00 00 00 00 0e 00 00 00 >................<
0000f0 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
000100 01 00 02 30 00 00 10 00 00 00 10 00 20 00 00 00 >...0........ ...<
000110 00 20 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >. ..............<
000120 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
000150 03 00 01 30 00 00 00 00 00 00 00 00 00 00 00 00 >...0............<
000160 04 00 41 27 00 00 00 00 f0 80 0b 00 00 00 00 00 >..A'............<
000170 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
0001b0 00 00 00 00 00 00 00 00 18 00 01 30 00 00 00 00 >...........0....<
0001c0 16 00 01 30 07 00 00 00 00 00 00 00 00 01 00 00 >...0............<
0001d0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
000270 00 00 00 00 17 00 01 30 05 00 00 00 00 00 00 00 >.......0........<
000280 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
000300 19 00 01 00 00 00 00 00 00 00 00 00 7f 7f 7f 7f >................<
000310 7f 7f 7f 7f 7f 7f 7f 7f 7f 7f 7f 7f 00 00 00 00 >................<
000320 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
0003c0 02 00 01 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
0003d0 00 00 00 00 01 00 00 80 00 00 00 00 00 00 00 00 >................<
0003e0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >................<
*
001000您的设备中没有启用内存空间(我一开始没有注意到这一点(。
在左侧的设备列表中，在控制行中，您有"Mem+"，但在右侧有"Mem-"(I/O访问同上(。在PCI规范中，Mem标志是命令寄存器的第1位。
通常，在linux中，驱动程序调用pci_enable_device函数，使设备联机，并根据驱动程序的指示启用内存和/或I/O访问(也就是说，它将1写入任一位或两位(。有关编写驱动程序的指导，请参阅Documentation/PCI/PCI.txt。
我的猜测是lspci只是没有显示BAR，因为设备的内存空间没有启用；看起来相同的地址——0xfbff0000-已经至少被分配给BAR 0[参见/proc/bus/pci转储中的偏移0x10]。BAR 1地址槽中偏移0x14处没有编程地址。
我可以看到这是一个不可预取的32位BAR
我在使用Altera FPGA时发现了类似的问题。如果我将BAR设置为32位，那么在执行lspci时它们不会出现。当我改为64位可预取BAR时，我在运行lspci时看到了它们。