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Date:      Tue, 19 Dec 2006 09:31:17 -0700 (MST)
From:      "M. Warner Losh" <imp@bsdimp.com>
To:        neha.makhija@honeywell.com
Cc:        freebsd-arm@freebsd.org
Subject:   Re: Application not working when Power OFF/ON is done while on reset its working
Message-ID:  <20061219.093117.43007816.imp@bsdimp.com>
In-Reply-To: <20061219.091449.1973603691.imp@bsdimp.com>
References:  <7943626.post@talk.nabble.com> <20061219.091449.1973603691.imp@bsdimp.com>

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In message: <20061219.091449.1973603691.imp@bsdimp.com>
            "M. Warner Losh" <imp@bsdimp.com> writes:
: In message: <7943626.post@talk.nabble.com>
:             neha_makhija <neha.makhija@honeywell.com> writes:
: : I am working on AT91RM9200 development board with ecos ported over it. I
: : have burnt the flash with the redboot image. When i turn off the board and
: : then turn it ON then the code doesnt work and doesnt show anything on the
: : hyperterminal. But if i reset the board then the code is working fine.
: 
: I'm guessing something is wrong with the power up sequence such that
: the boot flash isn't quite right by the time the AT91RM9200 starts its
: boot sequence.

In my experience, however, I've seen weird things when not the entire
flash is burned.  I've never used redboot because I didn't want the
hassles of GPL'd software on the embedded project I was working on (I
hate keeping track of all the tarballs, and the company doesn't want
the hassles).

I'd make sure that the redboot image was good for this board.  Maybe
it is waiting for some other part that is marginal and needs a second
reset to work.  Maybe it is compiled for a different PHY, so the
initial reset sequence doesn't quite work.  Maybe you have a hardware
problem in the components that the boot code touches.  We had a mixup
on the magnetics of our ethernet port that caused odd behavior during
the early stages of bringing up our board.

Warner



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