In case of Early I/O Release, core configuration can be done with the following command.
$ fpga loadfs 0 mmc 0:1 socfpga.core.rbf core
When configuring from a Hard Processor System (HPS), the rbf file to be configured is specified in bsp-editor, so basically, the configuration is done by specifying it in bsp-editor.
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Category: SoC
Tool: SoC EDS
Device: Arria® 10