AT91 bypass BMS pin = 0 change low level boot loader

[Steven Romme]

Dear Jean-Christophe

We have a problem that our AT91 board will not start from internal 
ROM because the BMS pin is not 
connected to 3.3 V. (BMS=0)

Since the chip is a BGA and the BMS pin is not connected to the outside 
of the PCB we cannot change 
the hardware setting making the BMS pin =1

We would like to know if it is possible to overwrite the low level boot program 
that senses the state of the BMS pin and choose to run the bootrom 
from the internal Rom
 or will try to boot from external flash.

I would appreciate your thoughts because we have a large series 
with this same problem already built.

Regards,

Steven Romme