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Picocell SX1308 with Sx1257 front-end calibration problems

Semtech Gateways
#1

I am using the reference design SX1308P915GW_Picocell and starting this Sx1308 with Sx1257 915MHz gateway that always get calibration problem:
WARNING: problem in calibration of radio A for image rejection
WARNING: problem in calibration of radio B for image rejection
WARNING: problem in calibration of radio A for TX DC offset
WARNING: problem in calibration of radio B for TX DC offset

I checked the SX1257 register write and read in lgw_setup_sx125x(). It is OK and the PLL lock has been started.

I also checked the Sx1308 register write and read in test_loragw_reg.c. The read operation get the same value as that after write operation.

So i suppose Sx1308 and Sx1257 has no problem.

But, when I start the gateway in lgw_start(). It shows the calibration warning messages.

So, what will cause the calibration problems? and How to solve it?
Thanks anyone help.