for ：Steven Ji . PCIe link up drop problem

You probably remember my old problems.

It has been a very long time that I've been stuck in this.

The situation is as follows:

1. my board FPGA connecting 6678.

 high chance of link up. but it will drop once link up, the ltssm field will drop to 0. So, no further things i can do on it.

2. two 6678EVM with BoC board 

 same  phenomenon(I　only change the EP RC configuration in the pcie example from MCSDK　and add some print of debug0)

I'm quite confused about this, is there any key point I should pay attention to when i connect the two evm with BoC?

or is it just my configuration problem？