How does B4860 support mini-pcie socket of one serdes lane?

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How does B4860 support mini-pcie socket of one serdes lane?

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frank2li
Contributor I

Hello

I have a B4860 based board, there is mini-pcie socket. It only uses one serdes lane from SERDES2. 

I want to know if it is supported one lane for pcie controller 1. And how to change the dts to support the mini-pcie?

Thank you very much!

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ufedor
NXP Employee
NXP Employee

In the processor's RM it is written:

"PCI Express (PCIe) and SRIO
• Downgrading is feasible-for example, if 4x is supported, then downgrading for 2x and 1x is possible. Downgrading is automatically controlled by the IP."

The x1 PCIe will be possible if the SerDes 2 Lane A is connected to the slot and appropriate SerDes 2 protocol is selected in the RCW.

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