Hi
Thanks for your answer Peter.
As Peter mentioned LPC is used on this board. Would it be enough to use the flash chips (for programming and reading) to just disable one chip with the #init signal?
Yes, sure.
Ok, this is good news.
It seems as if only one of the chips gets the #init to low, the other one will stay in reset mode and will keep its I/O pins in Z state?
Yes, but the question is what, if anything, controls the second INIT#. The patent suggests a timer circuit, but your measurements show that perhaps the timer circuit is just not there on production boards.
I think that there may be a watchdog placed at the open DIL pins nearby the flash if DualBios where to be used. But since there is plenty of
One solution is of course to not connect the two INIT# to the pads on the board, but to a separate switch circuit.
I think that #init pin is connected to open pads for both flash chips. So it should be pretty easy (1 or 2 pullup/pulldown resistors and 1 switch/jumper). Which would be much easier than desoldering a PLCC32 flash chip. The only thing i am not sure about is how the pulldown of #init on the soldered flash is realized.
I am currently waiting for Beth/Jose to double check and for the delivery of two spare flash chips and a PLCC32 socket.
ST