Date: 6 Feb 2013 13:01:06 +0200 From: "Car-Home-Cover.co.za" <Applications@car-home-cover.co.za> To: freebsd-arm@freebsd.org Subject: FREEBSD ARM, You Could Save R238pm on Insurance Premiums - Car-Home-Cover.co.za Message-ID: <1360150038-1531894.2545269.fr16B8bmH027809@rs528.luxhv.com>
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Wed, 6 Feb 2013 13:46:53 +0000 (UTC) (envelope-from ian@FreeBSD.org) Received: from duck.symmetricom.us (duck.symmetricom.us [206.168.13.214]) by mx1.freebsd.org (Postfix) with ESMTP id D251FAB0 for <freebsd-arm@FreeBSD.org>; Wed, 6 Feb 2013 13:46:52 +0000 (UTC) Received: from damnhippie.dyndns.org (daffy.symmetricom.us [206.168.13.218]) by duck.symmetricom.us (8.14.6/8.14.6) with ESMTP id r16DkqrL010430 for <freebsd-arm@FreeBSD.org>; Wed, 6 Feb 2013 06:46:52 -0700 (MST) (envelope-from ian@FreeBSD.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 r16Dko0Y033216; Wed, 6 Feb 2013 06:46:50 -0700 (MST) (envelope-from ian@FreeBSD.org) Subject: Re: SD card -image- for the beaglebone From: Ian Lepore <ian@FreeBSD.org> To: Iain Young <iain@g7iii.net> In-Reply-To: <5112115D.5040709@g7iii.net> References: <510A4F5B.7000407@g7iii.net> <1359646574.93359.327.camel@revolution.hippie.lan> <510AE1D6.8010203@g7iii.net> <1360124308.93359.557.camel@revolution.hippie.lan> <5112115D.5040709@g7iii.net> Content-Type: text/plain; charset="us-ascii" Date: Wed, 06 Feb 2013 06:46:49 -0700 Message-ID: <1360158409.93359.590.camel@revolution.hippie.lan> Mime-Version: 1.0 X-Mailer: Evolution 2.32.1 FreeBSD GNOME Team Port Content-Transfer-Encoding: 7bit Cc: freebsd-arm@FreeBSD.org X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Porting FreeBSD to the StrongARM Processor <freebsd-arm.freebsd.org> List-Unsubscribe: <http://lists.freebsd.org/mailman/options/freebsd-arm>, <mailto:freebsd-arm-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-arm>; List-Post: <mailto:freebsd-arm@freebsd.org> List-Help: <mailto:freebsd-arm-request@freebsd.org?subject=help> List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-arm>, <mailto:freebsd-arm-request@freebsd.org?subject=subscribe> X-List-Received-Date: Wed, 06 Feb 2013 13:46:53 -0000 On Wed, 2013-02-06 at 08:16 +0000, Iain Young wrote: > On 06/02/13 04:18, Ian Lepore wrote: > > > Check out what I taught my beaglebone to do today... > > > > root@bb:/ # ntpq -p > > remote refid st t when poll reach delay offset jitter > > ========================================================================== > > oPPS(0) .PPS. 0 l 4 16 377 0.000 0.399 0.008 > > +dvb.hippie.lan .GPS. 1 u 55 64 377 1.411 0.666 0.126 > > +tflex.hippie.la .GPS. 1 u 15 64 377 0.901 1.867 0.904 > > +paranoia.hippie .PPS. 1 u 61 64 377 0.396 0.426 0.025 > > xutcnist2.colora .ACTS. 1 u 71 64 376 34.136 -11.277 4.656 > > xnist1.symmetric .ACTS. 1 u 63 64 377 59.880 12.327 2.113 > > -ntp.your.org .CDMA. 1 u 4 64 377 51.185 -4.212 4.215 > > xntp1.conectiv.c .IRIG. 1 u 51 64 377 99.067 17.784 3.445 > > > > It turns out the chip has nice timer hardware that can latch the > > freeruning timercounter in response to the PPS signal. That allows for > > a PPS driver that doesn't use interrupts at all. The timecounter code > > has a specific interface for such hardware, but there isn't much example > > code in the base for how to use it. Soon there'll be more. :) > > > > I'll attach a patch in case anyone else wants to play with this. To use > > it, apply the patch, add "options PPS_SYNC" to the kernel config, and > > choose which timer pin you want to put the pps on. The attached patch > > uses the timer4 pin, which is exposed on the P8 connector as pin #7. > > You can use any of the timer4-timer7 pins, just set the one you want to > > use to "input" in the dts and the driver will use it. > > Thanks for that, looks great, and very interesting. I'll do more than > play with it (well when the 8 Gig card arrives anyway!) > > First thought, extending for multiple PPS :) [Because I can :P] > This kind of no-interrupt PPS driver that's tied closely to the system timecounter can only handle a single PPS signal. (There's only one system timer, and it has just one trigger pin.) Connecting more than one PPS is still going to require an interrupt-driven gpio solution. Even though there are four timers on the chip that have an external trigger input wired to a pin, it's basically impossible with the current freebsd timing code to combine triggered-capture of the pps pulse time with traditional interrupt handling to harvest the captured counter. When you try to do this, you occasionally end up with a sequence where the hardware latches the counter, then the timekeeping code switches to a new set of timehands before the interrupt handler is invoked, then you end up grabbing a latched counter value that matches up with the wrong set of timehands, and you get a measurement jump equal to the timer tick period. (I know most people don't care about these details, but it's actually nice to get them in writing somewhere searchable for future reference.) I've never configured a system for multiple PPS inputs, that'll be an interesting thing to play with. I need to learn more about our gpio framework (such as it is) and see if it's possible to put in a nice generic PPS driver that uses it. -- Ian
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