How to boot through UART2.

Hi,
I have recently got my BBB and I am trying to boot it through UART2 using standard DB-9 connector with RS232. I enabled the UART-2 using the following link http://blog.pignology.net/2013/05/getting-uart2-devttyo1-working-on.html and it worked well but I am not able to boot it through UART-2. Can anyone help me regarding this.

Thanks

There is no way to boot through UART2.

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Gerald