We have designed a SBC with MPC8548 PCIe 4x lanes connected with IDT PCIe swicth.My POR of processor is showing the correct configuration as 4x with 2.5Gbps,RC mode.But when i read the PCIe LTSSM register it shows lane is in Detect.quiet.when i probed the actual signals Processor side -Tx diff.voltage of one lane(Lane 0) shows 700mv pp and it is reaching the Rx.Remaining all other lane voltages are 0mv.Similarly,Receiver side -TX,only one lane diff.voltage is showing 112mv pp,remainig all other lanes are showing 0mv.what is the expected voltage levels?.The negotiated link width is showing 1x.Is it due to the same reason?what could be reason for the detect.quiet state? -- View this message in context: http://old.nabble.com/PCI-express%2C-link-down-problem..-tp31010155p31010155... Sent from the kernelnewbies mailing list archive at Nabble.com.