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Date:      Wed, 26 Jun 2013 10:39:33 -0700
From:      Oleksandr Tymoshenko <gonzo@bluezbox.com>
To:        Michael Tuexen <tuexen@freebsd.org>
Cc:        freebsd-arm@freebsd.org
Subject:   Re: Problems with Head on RaspberryPi
Message-ID:  <846063D0-A3D2-42AD-BC44-52A64910C4B0@bluezbox.com>
In-Reply-To: <F9C5795F-AB1D-4038-BE14-380A1A573DDD@freebsd.org>
References:  <F9C5795F-AB1D-4038-BE14-380A1A573DDD@freebsd.org>

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On 2013-06-26, at 10:22 AM, Michael Tuexen <tuexen@freebsd.org> wrote:

> Dear all,
> 
> I have build FreeBSD using the script from
> https://github.com/daveish/freebsd-arm-tools
> for a couple of weeks and it worked fine. However,
> doing this within the last days, compilation and
> installation works, but the Raspberry Pi doesn't
> boot. After Starting kernel with NULL args
> or so, it doesn't show anything else. Normally
> the FreeBSD boot messages would appear. Does anyone
> else also see this? Any idea how to get some
> debug output out of the Raspberry Pi?


Try disabling INVARIANTS options in the kernel. It seems
new code in uma_dbg performs atomic ops on the 
allocated memory and if memory has been remapped as 
non-cached it causes exception. 




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