Does BBB boot from the eMMC boot partition 1 or 2?

The Micron eMMC info refers to two 128K boot partitions and a user space. Does the BBB use one of those two boot partitions in its normal boot process?

I found this quote in the SRM, but it doesn’t really answer my question…
”For eMMC devices the ROM will only support raw mode. The ROM Code reads out raw sectors from image or the booting file within the file system and boots from it. In raw mode the booting image can be located at one of the four consecutive locations in the main area: offset 0x0 / 0x20000 (128 KB) / 0x40000 (256 KB) / 0x60000 (384 KB).”

They are not used.