Fitlet2 serial console redirection drops after OPNsense loads

[typoman]

I run on a Fitlet2 and cannot maintain serial console connection after the OS boots.  I am trying to deduce if OPNsense is lacking some driver I need to load or what.

I enabled serial console redirection in the BIOS as well as a setting that keeps it enabled after the OS loads.  I can see the POST and get into BIOS over a serial putty session.  Once the bootloader starts the OS, before I get the OPNsense ascii art splash screen, the serial session stops updating.

I also tried an Ubuntu Server USB boot image and after grub picks the OS, the serial console stops updating. 

I am looking for anyone that has successfully maintained a serial session on a Fitlet2 after OPNsense loads.