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There is this description in AM335x's Silicon Errata.
Has u-boot of SDK7.3 implemented "Advisory 1.0.19" workaround ?
The software leveling procedure described in this errata is implemented in the EMIF tools for AM335x https://www.ti.com/lit/pdf/SPRACK4 Be sure to follow the instructions in this app note to properly configure the DDR registers. Note if your design has a point to point data bus, software leveling algorithm does not need to be run. The EMIF tool output alone is satisfactory. For further info, please see the app note.
Regards,
James