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AM3359 doesn't respond to hardware reset

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Hey,

I have a design using AM3359ZCZ and the problem is that I found 2 boards (out of twelve I have made) have the following same booting issue:

After pressing the reset bottom, the console( via serial port) immediately shows "U-Boot SPL 2012.10-00010-g847bb01 (Oct 25 2012 -11:41:49)"

and then it hangs, but after a while it continues to boot normally and load the kernel, the period is uncertain and can range from several seconds to several minutes.

And something more weird is when CPU hangs in that case, it doesn't even respond to the hardware reset.

Does anyone know what happen during that period, why the hardware reset doesn't work?

PS:

The design is based on beagle bone, it has 256M ram and boots from uSD card.

Thanks!

Qi


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