I have Intel DG35EC board which has USB Legacy option disabled.
I can't even pass the installer bootloader with a PS/2 keyboard connected. When a single/multi-user mode is started, the keyboard stops working.
I can connect an USB keyboard which is being detected as kbd2 (ukbd1) and is working. When pressing the caps/scroll lock key, the LED on the PS/2 keyboard also changes.
After installing with the USB keyboard, the PS/2 one still doesn't work.
It happens on both of the amd64 and i386 versions of FreeBSD.