Raspberry Pi 2 need to disable serial UART port on boot

I have a Raspberry Pi 2 running FreeBSD 11.0-RELEASE and I need to disable the serial port on boot up as it's interrupting the boot process. I have a GPS module attached to the UART port which spews out data to the Pi every second or so.

I tried disabling the port in /etc/ttys but that has no effect. I presume my problem has something to do with uboot setup.

Can someone point me in the right direction?
If you disable the UART you won't be able to access the GPS module at all. You probably just need to disable the serial console.
I have created a file /boot/msdos/uEnv.txt with content:
At boot time with serial data coming in, the boot loader still stops displaying a continued line of "dots".

I didn't overlooked that part. This article explains how to recompile u-boot which is a NO-GO for me at the moment.

I have an urgent need to have this working so I am currently continuing deploying Raspbian at the moment... :(