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T4240 DDR initialize: why pops out "Automatic calibration error" in the DDRx_ERR_DETECT?

Question asked by carl peng on Jun 7, 2016
Latest reply on Nov 13, 2018 by Allen Andreu

In the hardware design, we connect 4  MT41K256M16 chips to DDR0 controller and no ECC. when do DDR initialization, find that it will pop out "Automatic calibration error", why?