udbg based fake hypervisor console

modulename: hvc_udbg.ko

configname: CONFIG_HVC_UDBG

Linux Kernel Configuration
└─>Device Drivers
└─>Character devices
└─>udbg based fake hypervisor console
In linux kernel since version 2.6.29 (release Date: 2009-03-23)  
This is meant to be used during HW bring up or debugging when
no other console mechanism exist but udbg, to get you a quick
console for userspace. Do NOT enable in production kernels.

source code: