The “Development Guide 32.2” says
"
Jetson TX2 TegraBoot is the bootloader component that executes after MB1. This component is divided into two portions:
•TBoot-BPMP (MB2)
•TBoot-CPU
The processor on which they are executing determines which component runs. Both are released to OEMs as source code for reference implementation
"
Where are these source? I can’t find it any where.