> > > These resources are supplied to the PCI core, probably from DT. A > > > complete dmesg log would show more. The rb532 does not have device tree support, so the answer is no. I am using a common vanilla kernel without any extra patch. > It's hard to tell what this 00:00.0 device is. The Vendor ID 0x111d > is "Microsemi / PMC / IDT" (now owned by Microchip Technology, per > https://pci-ids.ucw.cz/read/PC/111d). > > The Device ID of 0x0000 looks invalid (though that's defined by the > vendor, and I think the PCIe spec would allow 0). > > The class code is invalid. Likely the device has configuration > registers for the PCI host bridge. > > pci_bus 0000:00: root bus resource [mem 0x50000000-0x5fffffff] > > pci_bus 0000:00: root bus resource [io 0x18800000-0x188fffff] > > pci_bus 0000:00: root bus resource [??? 0x00000000 flags 0x0] > > pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff] > > pci 0000:00:00.0: [111d:0000] type 00 class 0x000000 > > pci 0000:00:00.0: reg 0x10: [mem 0x00000000-0x07ffffff pref] > > pci 0000:00:00.0: [Firmware Bug]: reg 0x14: invalid BAR (can't size) > > pci 0000:00:00.0: [Firmware Bug]: reg 0x18: invalid BAR (can't size) > > It's hard to tell what this 00:00.0 device is. The Vendor ID 0x111d > is "Microsemi / PMC / IDT" (now owned by Microchip Technology, per > https://pci-ids.ucw.cz/read/PC/111d). > Can you collect the output of "lspci -vvxxx" as root? uc-rb532 ~ # lspci -vvxxx 00:00.0 Non-VGA unclassified device: Integrated Device Technology, Inc. Device 0000 Subsystem: Device 0214:011d Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV+ VGASnoop- ParErr+ Stepping- SERR+ FastB2B- DisINTx- Status: Cap- 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort+ >SERR- <PERR- INTx- Latency: 60 (2000ns min, 14000ns max), Cache Line Size: 16 bytes Interrupt: pin A routed to IRQ 140 Region 0: Memory at <unassigned> (32-bit, prefetchable) Region 1: I/O ports at <ignored> Region 2: I/O ports at <ignored> 00: 1d 11 00 00 57 01 a0 22 00 00 00 00 04 3c 00 00 10: 08 00 00 00 01 00 80 18 01 00 00 18 00 00 00 00 20: 00 00 00 00 00 00 00 00 00 00 00 00 14 02 1d 01 30: 00 00 00 00 00 00 00 00 00 00 00 00 8c 01 08 38 40: 80 80 00 00 6e 0d 00 00 00 00 00 00 51 00 00 00 50: 00 00 00 00 55 00 00 00 00 00 00 18 00 00 00 00 60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00:02.0 Ethernet controller: VIA Technologies, Inc. VT6105/VT6106S [Rhine-III] (rev 86) Subsystem: AST Research Inc Device 086c Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping+ SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 64 Interrupt: pin A routed to IRQ 142 Region 0: I/O ports at 18800000 [size=256] Region 1: Memory at 50014000 (32-bit, non-prefetchable) [size=256] Capabilities: [40] Power Management version 2 Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=100mA PME(D0-,D1+,D2+,D3hot+,D3cold+) Status: D0 PME-Enable- DSel=0 DScale=0 PME- Kernel driver in use: via-rhine 00: 06 11 06 31 87 00 10 02 86 00 00 02 00 40 00 00 10: 01 00 80 18 00 40 01 50 00 00 00 00 00 00 00 00 20: 00 00 00 00 00 00 00 00 00 00 00 00 0d 10 6c 08 30: 00 00 00 00 40 00 00 00 00 00 00 00 8e 01 00 00 40: 01 00 82 f6 00 00 00 00 00 00 00 00 00 00 00 00 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00:03.0 Ethernet controller: VIA Technologies, Inc. VT6105/VT6106S [Rhine-III] (rev 86) Subsystem: AST Research Inc Device 086c Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping+ SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 64 Interrupt: pin A routed to IRQ 143 Region 0: I/O ports at 18800400 [size=256] Region 1: Memory at 50014100 (32-bit, non-prefetchable) [size=256] Capabilities: [40] Power Management version 2 Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=100mA PME(D0-,D1+,D2+,D3hot+,D3cold+) Status: D0 PME-Enable- DSel=0 DScale=0 PME- Kernel driver in use: via-rhine 00: 06 11 06 31 87 00 10 02 86 00 00 02 00 40 00 00 10: 01 04 80 18 00 41 01 50 00 00 00 00 00 00 00 00 20: 00 00 00 00 00 00 00 00 00 00 00 00 0d 10 6c 08 30: 00 00 00 00 40 00 00 00 00 00 00 00 8f 01 00 00 40: 01 00 82 f6 00 00 00 00 00 00 00 00 00 00 00 00 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00:04.0 Network controller: Atheros Communications Inc. Device 0029 (rev 01) Subsystem: Atheros Communications Inc. Device 2091 Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 168, Cache Line Size: 16 bytes Interrupt: pin A routed to IRQ 142 Region 0: Memory at 50000000 (32-bit, non-prefetchable) [size=64K] Capabilities: [44] Power Management version 2 Flags: PMEClk- DSI- D1- D2- AuxCurrent=100mA PME(D0+,D1-,D2-,D3hot+,D3cold-) Status: D0 PME-Enable- DSel=0 DScale=0 PME- Kernel driver in use: ath9k 00: 8c 16 29 00 06 00 b0 02 01 00 80 02 04 a8 00 00 10: 00 00 00 50 00 00 00 00 00 00 00 00 00 00 00 00 20: 00 00 00 00 00 00 00 00 00 00 00 00 8c 16 91 20 30: 00 00 00 00 44 00 00 00 00 00 00 00 8e 01 00 00 40: 80 00 00 00 01 00 82 48 00 00 00 00 00 00 00 00 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00:05.0 Serial controller: Oxford Semiconductor Ltd OX16PCI954 (Quad 16950 UART) function 0 (Uart) (rev 01) (prog-if 06 [16950]) Subsystem: Oxford Semiconductor Ltd Device 0000 Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Interrupt: pin A routed to IRQ 143 Region 0: I/O ports at 18800800 [size=32] Region 1: Memory at 50010000 (32-bit, non-prefetchable) [size=4K] Region 2: I/O ports at 18800820 [size=32] Region 3: Memory at 50011000 (32-bit, non-prefetchable) [size=4K] Capabilities: [40] Power Management version 2 Flags: PMEClk- DSI- D1- D2+ AuxCurrent=0mA PME(D0+,D1-,D2+,D3hot+,D3cold-) Status: D0 PME-Enable- DSel=0 DScale=0 PME- Kernel driver in use: serial 00: 15 14 01 95 03 00 90 02 01 06 00 07 00 00 80 00 10: 01 08 80 18 00 00 01 50 21 08 80 18 00 10 01 50 20: 00 00 00 00 00 00 00 00 00 00 00 00 15 14 00 00 30: 00 00 00 00 40 00 00 00 00 00 00 00 8f 01 00 00 40: 01 00 02 6c 00 00 00 00 00 00 00 00 00 00 00 00 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00:05.1 Non-VGA unclassified device: Oxford Semiconductor Ltd OX16PCI954 (Quad 16950 UART) function 0 (Disabled) (rev 01) Subsystem: Oxford Semiconductor Ltd Device 0000 Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Interrupt: pin A routed to IRQ 143 Region 0: I/O ports at <unassigned> [disabled] Region 1: I/O ports at <unassigned> [disabled] Region 2: I/O ports at <unassigned> [disabled] Capabilities: [40] Power Management version 2 Flags: PMEClk- DSI- D1- D2+ AuxCurrent=0mA PME(D0+,D1-,D2+,D3hot+,D3cold-) Status: D0 PME-Enable- DSel=0 DScale=0 PME- 00: 15 14 00 95 00 00 90 02 01 00 00 00 00 00 80 00 10: 01 00 00 00 01 00 00 00 01 00 00 00 00 00 00 00 20: 00 00 00 00 00 00 00 00 00 00 00 00 15 14 00 00 30: 00 00 00 00 40 00 00 00 00 00 00 00 8f 01 00 00 40: 01 00 02 6c 00 00 00 00 00 00 00 00 00 00 00 00 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00:0a.0 Serial controller: Oxford Semiconductor Ltd OX16PCI954 (Quad 16950 UART) function 0 (Uart) (rev 01) (prog-if 06 [16950]) Subsystem: Oxford Semiconductor Ltd Device 0000 Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Interrupt: pin A routed to IRQ 140 Region 0: I/O ports at 18800840 [size=32] Region 1: Memory at 50012000 (32-bit, non-prefetchable) [size=4K] Region 2: I/O ports at 18800860 [size=32] Region 3: Memory at 50013000 (32-bit, non-prefetchable) [size=4K] Capabilities: [40] Power Management version 2 Flags: PMEClk- DSI- D1- D2+ AuxCurrent=0mA PME(D0+,D1-,D2+,D3hot+,D3cold-) Status: D0 PME-Enable- DSel=0 DScale=0 PME- Kernel driver in use: serial 00: 15 14 01 95 03 00 90 02 01 06 00 07 00 00 80 00 10: 41 08 80 18 00 20 01 50 61 08 80 18 00 30 01 50 20: 00 00 00 00 00 00 00 00 00 00 00 00 15 14 00 00 30: 00 00 00 00 40 00 00 00 00 00 00 00 8c 01 00 00 40: 01 00 02 6c 00 00 00 00 00 00 00 00 00 00 00 00 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00:0a.1 Non-VGA unclassified device: Oxford Semiconductor Ltd OX16PCI954 (Quad 16950 UART) function 0 (Disabled) (rev 01) Subsystem: Oxford Semiconductor Ltd Device 0000 Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Interrupt: pin A routed to IRQ 140 Region 0: I/O ports at <unassigned> [disabled] Region 1: I/O ports at <unassigned> [disabled] Region 2: I/O ports at <unassigned> [disabled] Capabilities: [40] Power Management version 2 Flags: PMEClk- DSI- D1- D2+ AuxCurrent=0mA PME(D0+,D1-,D2+,D3hot+,D3cold-) Status: D0 PME-Enable- DSel=0 DScale=0 PME- 00: 15 14 00 95 00 00 90 02 01 00 00 00 00 00 80 00 10: 01 00 00 00 01 00 00 00 01 00 00 00 00 00 00 00 20: 00 00 00 00 00 00 00 00 00 00 00 00 15 14 00 00 30: 00 00 00 00 40 00 00 00 00 00 00 00 8c 01 00 00 40: 01 00 02 6c 00 00 00 00 00 00 00 00 00 00 00 00 50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 70: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 90: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 a0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 b0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 c0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 d0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 e0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 f0: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > If those UARTs are capable of DMA, it's conceivable they could corrupt something. yes, it looks like something corrupts the memory.
