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Please direct questions about the AM389x to the correct processor forum: http://e2e.ti.com/support/dsp/davinci_digital_media_processors/f/717.aspx
U-Boot creates a partition table using the "mtdparts" command. For more info type "help mtdparts".
The piece of code you have pasted is from the kernel board file. It is not related to how U-Boot detects NAND flash partitions.