IMX6's PCIe errors after link!

sunnyvan — Wed, 27 Apr 2016 16:29:31 GMT

I am trying to connect Imx6 and Com-express module(the core is intel i7 5th).Imx6 is working in EP mode.From the log,I know the linkup is established,however,no pcie node can be found with command "lspci".

.............

cpaddr = ea880000 suspend_iram_base=ea8e8000

PM driver module loaded

iMX6 PCIe PCIe EP mode imx_pcie_pltfm_probe entering.

dbi_base maped addr is 1ffc000

PCIE: imx_pcie_pltfm_probe start link up.

PCIe EP: waiting for link up...zxsm version 1.0

PCIe EP: link up.

.............

Before linkup,some PCIe CTRL EP Mode Memory Registers are printed as follow:

PCIe EP: PLC_REG 0x10120

PCIe EP: GPR1 0x48610005

PCIe EP: GPR4 0xf00000cf

PCIe EP: GPR8 0xfffd4000

PCIe EP: GPR12 0x0f000490

PCIe EP: PLC_REG 0x10120

PCIe EP: PCIE_EP_DeviceID 0xabcd16c3

PCIe EP: PCIE_EP_Command 0x100000

PCIe EP: PCIE_EP_BIST 0x0

PCIe EP: PCIE_EP_BAR0 0xc

PCIe EP: PCIE_EP_ILR 0x1ff

PCIe EP: PCIE_EP_AER 0x14010001

PCIe EP: PCIE_EP_UESR 0x0

PCIe EP: PCIE_EP_UEMR 0x0

PCIe EP: PCIE_EP_UESevR 0x62030

PCIe EP: PCIE_EP_CESR 0x0

PCIe EP: PCIE_EP_CEMR 0x2000

PCIe EP: PCIE_EP_ACCR 0xa0

PCIe EP: PCIE_EP_HLR 0x0

PCIe EP: PCIE_EP_VCECHR 0x10002

PCIe EP: PCIE_EP_PVCCR1 0x0

PCIe EP: PCIE_EP_PVCCR2 0x0

PCIe EP: PCIE_EP_PVCCSR 0x0

PCIe EP: PCIE_EP_VCRCR 0x0

PCIe EP: PCIE_EP_VCRConR 0x800000ff

PCIe EP: PCIE_EP_VCRSR 0x20000

After linkup,these Registers are printed as follow:

PCIe EP: PCIE_EP_DeviceID 0xabcd16c3

PCIe EP: PCIE_EP_Command 0x100000

PCIe EP: PCIE_EP_BIST 0x0

PCIe EP: PCIE_EP_BAR0 0xc

PCIe EP: PCIE_EP_ILR 0x1ff

PCIe EP: PCIE_EP_AER 0x14010001

PCIe EP: PCIE_EP_UESR 0x2000

PCIe EP: PCIE_EP_UEMR 0x0

PCIe EP: PCIE_EP_UESevR 0x62030

PCIe EP: PCIE_EP_CESR 0x81

PCIe EP: PCIE_EP_CEMR 0x2000

PCIe EP: PCIE_EP_ACCR 0xad

PCIe EP: PCIE_EP_HLR 0x0

PCIe EP: PCIE_EP_VCECHR 0x10002

PCIe EP: PCIE_EP_PVCCR1 0x0

PCIe EP: PCIE_EP_PVCCR2 0x0

PCIe EP: PCIE_EP_PVCCSR 0x0

PCIe EP: PCIE_EP_VCRCR 0x0

PCIe EP: PCIE_EP_VCRConR 0x800000ff

PCIe EP: PCIE_EP_VCRSR 0x0

according to these values,several errors are found as:

1 Flow_Control_Protocol_Error_Status bit in Register PCIE_EP_UESR is changed to 1.

2 Bad_DLLP_Status bit in Register PCIE_EP_CESR is changed to 1.

what are the probable reasons for these errors?

Thank you!

Re: IMX6's PCIe errors after link!

igorpadykov — Thu, 28 Apr 2016 02:23:31 GMT

Hi SUNNY

for connection i.MX6 PCIe with PC suggest to check discussions

on below link (posts from key two)

i.MX6Q PCIe EP/RC Validation System

these errors seem as protocol errors, however they also can be

caused by poor link. Just for test it may be recommended to use

100MHz reference clock from PC:

set the CLK1 to be input, leave the PLL_ENET in bypass when it is configured; set source to CLK1,

override PCIe PHY multipliers to use a 100MHz reference.

Best regards

igor

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Re: IMX6's PCIe errors after link!

袁增兴 — Tue, 22 Nov 2016 01:17:23 GMT

Hi SUNNY

We have a similarly problem!

Did you resolve it finally?

Re: IMX6's PCIe errors after link!

sunnyvan — Mon, 03 Apr 2017 05:17:55 GMT

not yet..

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IMX6's PCIe errors after link!

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Re: IMX6's PCIe errors after link!