From owner-freebsd-current@FreeBSD.ORG  Wed Sep 19 21:12:09 2012
Return-Path: <owner-freebsd-current@FreeBSD.ORG>
Delivered-To: freebsd-current@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 1D7E0106564A;
	Wed, 19 Sep 2012 21:12:09 +0000 (UTC)
	(envelope-from freebsd@damnhippie.dyndns.org)
Received: from duck.symmetricom.us (duck.symmetricom.us [206.168.13.214])
	by mx1.freebsd.org (Postfix) with ESMTP id D91E48FC0C;
	Wed, 19 Sep 2012 21:12:08 +0000 (UTC)
Received: from damnhippie.dyndns.org (daffy.symmetricom.us [206.168.13.218])
	by duck.symmetricom.us (8.14.5/8.14.5) with ESMTP id q8JLC8rX060873;
	Wed, 19 Sep 2012 15:12:08 -0600 (MDT)
	(envelope-from freebsd@damnhippie.dyndns.org)
Received: from [172.22.42.240] (revolution.hippie.lan [172.22.42.240])
	by damnhippie.dyndns.org (8.14.3/8.14.3) with ESMTP id q8JLC6b4059102; 
	Wed, 19 Sep 2012 15:12:06 -0600 (MDT)
	(envelope-from freebsd@damnhippie.dyndns.org)
From: Ian Lepore <freebsd@damnhippie.dyndns.org>
To: Adrian Chadd <adrian@freebsd.org>
In-Reply-To: <CAJ-Vmon-Mv21PB06ZdC2N1FguD4kHnsNt1kny9T=eHQXRygojA@mail.gmail.com>
References: <80840563.20120920002200@serebryakov.spb.ru>
	<1252171344.20120920003724@serebryakov.spb.ru>
	<1348087584.95562.55.camel@revolution.hippie.lan>
	<1859311530.20120920005449@serebryakov.spb.ru>
	<CAJ-VmokF=JK=TS34CdHqO5BTh6WN950tdK0C+UOWpFoQhTHhYA@mail.gmail.com>
	<1348088706.95562.61.camel@revolution.hippie.lan>
	<CAJ-Vmon-Mv21PB06ZdC2N1FguD4kHnsNt1kny9T=eHQXRygojA@mail.gmail.com>
Content-Type: text/plain; charset="us-ascii"
Date: Wed, 19 Sep 2012 15:12:06 -0600
Message-ID: <1348089126.95562.62.camel@revolution.hippie.lan>
Mime-Version: 1.0
X-Mailer: Evolution 2.32.1 FreeBSD GNOME Team Port 
Content-Transfer-Encoding: 7bit
Cc: lev@freebsd.org, freebsd-current@freebsd.org
Subject: Re: Latest -CURRENT/i386 could not start under VirutalBox 4.1.18
 and 4.2 (Windows host): hangs up after atrtc0 detection
X-BeenThere: freebsd-current@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Discussions about the use of FreeBSD-current
	<freebsd-current.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>, 
	<mailto:freebsd-current-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-current>
List-Post: <mailto:freebsd-current@freebsd.org>
List-Help: <mailto:freebsd-current-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-current>,
	<mailto:freebsd-current-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 19 Sep 2012 21:12:09 -0000

On Wed, 2012-09-19 at 14:08 -0700, Adrian Chadd wrote:
> On 19 September 2012 14:05, Ian Lepore <freebsd@damnhippie.dyndns.org> wrote:
> 
> >> Add something to atrtc_start() to only loop over that loop say, 64k
> >> times before dropping out; and print an error if it hits that
> >> condition.
> >>
> >> Also, what's that RTCSA_8192 bit do?
> >
> > That should set the interrupt rate really high, to minimize the time
> > wasted waiting for the status bit to change in the register.  Maybe
> > that's the part that vbox isn't emulating well and so it never simulates
> > an interrupt and leaves that loop.  Or maybe because the loop is a tight
> > busy-wait the emulator never gets control to simulate the occurance of
> > the interrupt.
> 
> Right. Being totally clueless, is atrc_start() called just at
> probe/attach, or during normal operation?
> 

It's called just once, from the attach() routine for the rtc device.

-- Ian