No keyboard input during bootloader

Ever since I started using FreeBSD, I have had one main issue which bothers me to this day. None of my keyboard input is accepted at the FreeBSD bootloader screen. So I can't, say, select a boot environment if I can't get into my system anymore. There's no indication of there being a setting in BIOS that would solve this, I've checked all the settings. My system is an HP Proliant ML110 G6. It's also my only system that has this issue out of the handful of other boxes I've run FreeBSD on. Is this just a hardware issue and I'm SOL or what?
 
I assume this is a USB keyboard?

I have the same issue on a Mac mini (model 2,1). It is not until the root file sytem is loaded that the USB attached keyboard works. A quick trawl through bugzilla finds a few longstanding open PRs with the issue.

 
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