Under linux Linux version 3.0.35_B01_V1.0, a imx6q-like board is connected to a PCIE-mini interface wlan RTL8192EE. Checked the differential clock is about 100MHz, the power and reset is supplied. Pcie has been configurated like that:
[ 6.457696] iMX6 PCIe PCIe RC mode imx_pcie_pltfm_probe entering.
[ 6.464063] _clk_pcie_enable!!
[ 6.467207] PCIE: imx_pcie_pltfm_probe card_reset.
[ 6.578918] PCIE: imx_pcie_pltfm_probe start link up.
[ 6.584062] PCIE: imx_pcie_pltfm_probe add_pcie_port.
[ 7.195101] link up failed, DB_R0:0x00ea5800, DB_R1:0x08200000!
[ 7.201138] IMX PCIe port: link down with power supply 1!
I tested the PCIE_TXP/PCIE_TXN pin signal waveform, as the attached file pcie.jpg. The amplitude peak is 400mV.
Is this waveform correct ?Could you give us some advise about this issue?