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Date:      Thu, 23 Oct 2014 04:22:44 +0200
From:      Bernd Walter <ticso@cicely7.cicely.de>
To:        Luiz Otavio O Souza <lists.br@gmail.com>
Cc:        Andreas Schwarz <Andreas.Schwarz@schwarzes.net>, George Rosamond <george@ceetonetechnology.com>, "freebsd-arm@freebsd.org" <freebsd-arm@freebsd.org>, ticso@cicely.de, Tim Kientzle <tim@kientzle.com>
Subject:   Re: sd card probing (was: FreeBSD 10.0 on Raspberry PI B+ no network devices
Message-ID:  <20141023022244.GB16490@cicely7.cicely.de>
In-Reply-To: <CAB=2f8xHEeF8DtP1eCkpp3Y0rZu3w0Phi_gzMSByGJ74xaFchg@mail.gmail.com>
References:  <A7221D06-31EC-4E00-A08C-64DB33F400FE@gromit.dlib.vt.edu> <20140825163528.d2e696cc3d03ad9bebcd239c@schwarzes.net> <20140826074951.4cf5a8fc@X220.alogt.com> <53FD1646.2010103@ceetonetechnology.com> <20140827021349.1273f703c6756d07fad72a16@schwarzes.net> <20141014032743.GK38905@cicely7.cicely.de> <20141014041305.GM38905@cicely7.cicely.de> <CAB=2f8wiBLRYBVHUw-PptzQE-QP3%2B1EmHFMMMipZWi_dUG9m8w@mail.gmail.com> <20141022204454.GA12231@cicely7.cicely.de> <CAB=2f8xHEeF8DtP1eCkpp3Y0rZu3w0Phi_gzMSByGJ74xaFchg@mail.gmail.com>

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On Wed, Oct 22, 2014 at 11:43:01PM -0200, Luiz Otavio O Souza wrote:
> On 22 October 2014 18:44, Bernd Walter  wrote:
> > On Tue, Oct 14, 2014 at 12:51:50PM -0300, Luiz Otavio O Souza wrote:
> >> On 14 October 2014 01:13, Bernd Walter wrote:
> >> >
> >> > Ok - that card problem seems random or contact related.
> >> > Whatever, it is 6 am - time to sleep ;-)
> >>
> >> I've found a missing silicon bug workaround on our driver.
> >>
> >> It's pretty recent and i'm still building new images to test with more
> >> cards, but it did fix all the instability i was seeing on the
> >> identification of one of my cards.
> >>
> >> Together with the new firmware (yes, there is another SD fix there) my
> >> RPi B rev 2 (with this same card) has gone from unusable to rock
> >> stable (i've done 80 cold boots without any damage/corruption to the
> >> card).
> >>
> >> Please, give it a try and let me know if it helps.
> >
> > Tested.
> > All I can say so far is that it is random, but your patch didn't help.
> 
> Without my patch you should see the speed and the bus width changing
> over the boots and with my patch it should always be the same
> (41.6MHz/4bit):
> > mmcsd0: 8GB <SDHC 00000 1.0 SN 62A50A6C MFG 11/2013 by 27 SM> at mmc0 41.6MHz/4bit/65535-block
> 
> > Furthermore this problem now happens on each boot try.
> > It still may be possible that it can boot, but I've tried many more
> > times than needed before.
> >
> > Timecounters tick every 10.000 msec
> > usbus0: 480Mbps High Speed USB v2.0
> > ugen0.1: <DWCOTG> at usbus0
> > uhub0: <DWCOTG OTG Root HUB, class 9/0, rev 2.00/1.00, addr 1> on usbus0
> > mmcsd0: 8GB <SDHC 00000 1.0 SN 62A50A6C MFG 11/2013 by 27 SM> at mmc0 41.6MHz/4bit/65535-block
> > mmcsd0: Error indicated: 1 Timeout
> > mmcsd0: Error indicated: 1 Timeout
> > fb0: 656x416(0x0@0,0) 16bpp
> > fb0: pitch 1312, base 0x5e006000, screen_size 545792
> > fbd0 on fb0
> > VT: initialize with new VT driver "fb".
> 
> Ok.  Can you try add the following to /boot/loader.conf ?
> 
> echo hw.bcm2835.sdhci.hs=0 >> /boot/loader.conf
> 
> RPi _is_ picky about the SD card, the patch won't make that go away
> but should help in a few cases.

I know - that's the reason why I bought the B+ boards in bundle with
cards directly from Farnell.
Hoped they wouldn't make any problems under FreeBSD.
The cards unfortunately are unlabeled, just the included SD adapter
has a raspi logo.

> There is a possibility that your card won't work in HS mode and now
> that the card identification always works, it will always go with the
> highest supported speed. The tunable should help if that is the case.

This makes sense.
I don't remember this card/board combination, but about a year ago, when
I used other cards in other boards the speed and width wasn't always the
same.

And you are absolutely right, with that loader.conf entry it works.
...
mmcsd0: 8GB <SDHC 00000 1.0 SN 62A50A6C MFG 11/2013 by 27 SM> at mmc0 25.0MHz/4bit/65535-block
...


-- 
B.Walter <bernd@bwct.de> http://www.bwct.de
Modbus/TCP Ethernet I/O Baugruppen, ARM basierte FreeBSD Rechner uvm.



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