Michael-san,

Thank you for your comment.

From: Michael Ellerman <redacted>
Subject: Re: [PATCH 6/15] hypervisor console driver for Celleb
Date: Tue, 12 Dec 2006 15:09:26 +1100

Why do you need hvc_beat_useit? You don't want the driver loaded at all
sometimes? Is console=blah not enough?

Mainly it is used to stop polling "beat" console temporary without
changing code. Because the "beat" console does not use interrupts
and/or buffers, polling the console and printing to the console
impact kernel performance deeply. Adding to that, the code was written
when the serial port driver is not implemented.

In short, we'd like to stop working the "beat" driver in some situation;
I don't know that console=blah is enough to do that.

Best regards,
Kou Ishizaki