It is the full U-Boot. It is not the ROM code.

In the world of embedded systems, the journey from a dead chip to a running operating system is a tightly choreographed dance. At the heart of this choreography for many Texas Instruments (TI) SoCs (like the AM335x, AM437x, and OMAP-L138) lies a small but critical file: dcboot.bin .

Let’s pull back the curtain on dcboot.bin . Simply put, dcboot.bin is a second-stage program loader (SPL) for TI processors. Its name derives from D irect C onnect Boot —a reference to the JTAG-less, memory-mapped boot process from external flash.