Michi,
[quote user="Michi Yama"]
According to the AM3874 datasheet 7.2.8 DDR3 Software Write/Read leveling, "When software leveling is used there is no need to enable the leveling feature of the external DDR3 SDRAM.
However, JEDEC specifies the leveling feature of DDR3 memory as you know. I think TI's software leveling is special case. How do you think about this?
[/quote]
"leveling of the external DDR3" is the same as "hardware leveling" and "auto-leveling". And hardware leveling is not supported on AM387x device per silicon bug/errata. See section 2.1.3. Thus only software leveling is available.
BR
Pavel