Stratix 10 E-tile Transceiver Native PHY : What is defination of PMA adaptaion parameters?

Please give help to know the defination of PMA adaptation paramters .

GS1,GS2,RF_B1,RF_B0,RF_A,RF_P2,RF_P1,RF_P0,RF_B0T,RF_P1_MAX,etc.

There is link fault on low data rate (2.4Gbps~4.98Gbps,9.8Gbps can link up),the signal rx_is _lockedtodata could not assert stably, So which reasons could make the link fault?

And whether does it has some help to link fault by adjusting those PMA adaption parameters manually(beacuse it could not link up after inital adaption).

Thank you, BR!