I'm trying to get ESXi 5.5 install over serial working, and I've been following the instructions here: http://www.vmwareadmins.com/installing-esxi-serial-console-headless-video-card/
This works fine in 5.1, but in 5.5 when the install finishes I see the login prompt over serial, but it does not accept any keyboard entries. Does anyone know if the kernel parameters or anything else has changed for 5.5?