The following reply was made to PR kern/29600; it has been noted by GNATS.

From: YAMAMOTO Takashi <yamt@mwd.biglobe.ne.jp>
To: naoki@fukaumi.org
Cc: fun@naobsd.org, gnats-bugs@netbsd.org
Subject: Re: kern/29600: cbb(4) hangs on boot
Date: Sat, 12 Mar 2005 17:06:48 +0900

 > We don't have any reason to wait value is changed in while() loop.
 > 
 > tsleep() will be awakened if power cycle event occured. There is no
 > reason to check sc_pwrcycle value.
 
 i think
 	while (condition) {
 		sleep();
 	}
 is a common convention to prevent spurious wakeups.
 
 YAMAMOTO Takashi