Isn't it to be started from the /etc/ttyab ?
console "/usr/bin/xaaes" tw52 on secure (This starts my XaAES)
# console "/usr/bin/execgem" tw52 on secure (this would start AES in ROM)
# console "/usr/bin/n_aes" tw52 on secure (meant to start N.aes)
# console "/usr/sbin/getty" tw52 on secure (this i use to start into textmode)