[U-Boot] Is running another .scr file from within boot.scr possible?

Hi, is it possible to exec another .scr file from within boot.scr ? Or is there another alternative to auto-run a different script file?

The goal is to have different script files, one say for normal boot from SD, and the other say for booting from a tftp-server.

Btw, is the interpreter that runs the boot.scr a sh/bash interpreter?

Thx