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Date:      Mon, 18 Feb 2013 10:57:28 -0800
From:      Oleksandr Tymoshenko <gonzo@bluezbox.com>
To:        Brett Wynkoop <wynkoop@wynn.com>
Cc:        freebsd-arm@freebsd.org
Subject:   Re: failed mount root on pi
Message-ID:  <51227998.2030401@bluezbox.com>
In-Reply-To: <20130218112127.326bda1e@ivory.wynn.com>
References:  <20130218112127.326bda1e@ivory.wynn.com>

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On 2/18/2013 8:21 AM, Brett Wynkoop wrote:
> Greeting-
>
> I built a new kernel from head as of yesterday.  The new kernel boots
> fine, but it can not seem to mount root.
>
> I am wondering if anyone else is having the same issue and what may
> have changed to make it impossible for the Pi to mount the SD card.
>
There was a problem with SDHCI driver: card capabilities read from the 
card were
incomplete. Usually it was 1-bit bus instead of 4-bit bus or no high 
speed timing
for cards that support high speed timing. It worked although not at maximum
performance. With this problem gone new bug revealed - some cards stop
responding when SDHCI is switched to high speed timing mode. Me and Ian
looking into it. Meanwhile try adding following string to /boot/loader.rc on
UFS partition:

set hw.bcm2835.sdhci.hs=0





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