Is this a custom kernel compile?

[renzokuken01]

I want to add a USB as the CPU, the MT7620N has USB, but this device, I believe, do not make use those pins. So, depending if the kernel is custom compiled it may or may not have a USB module. I'm really no expert in the Linux source code, I so don't which source files or config files to look to verify.

Another possibility is that the kernel image sometimes has short descriptions embedded in them, maybe there are clues there?

I'm just throwing things out there as I don't know enough about compiling kernels.