wraplinux nbi with 3.X kernel

[robinsmidsrod]

You shouldn't be using NBI support. It's a very old way of booting and is mostly obsolete. I don't think it's received any testing in the last few years. What are you trying to achieve with using NBI?

Most likely your binary is being detected as something else and iPXE tries to execute garbage data. Using imgstat before booting the kernel should probably tell you more.