[U-Boot] License Problems for standalone application at u-boot

Dear u-boot authors,

We have a standalone application, and u-boot will supply jump address and some services to this application. I wonder are there any license problems (GPL or u-boot) for our standalone application at below condition:

1. Some services which we wrote have included some u-boot header file? 2. All the services we wrote by ourselves, and not using any u-boot source code and header file?

Currently, we are number 1 situation.

Thank you

Best Regards, Peter Chen