What does the primary boot loader control?

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Attempting to figure out what exactly the primary boot loader (pbl) does... Working on modifications to the samsung moment m900 (utilizing the s3c6410 chipset) and we are trying to determine if the pbl is responsible for setting up the partitions in the ONEnand... the file is labeled as boot.bin.. We know the sbl contains the kernel and downloader mode, along with other non low-level hardware... but would the partitioning take place in the pbl or sbl?

Nevermind.. more i think about it, the partition of ONEnand HAS TO occur in the pbl.. since the boot.bin (pbl) loads into partition bml1.. it wouldn't be able to do this unless it already partitioned...