[coreboot] Dual SPI Flash

Peter Stuge peter at stuge.se
Thu Feb 23 14:16:46 CET 2012

Oliver Schinagl wrote:
> I noticed an intersting hack on the coreboot wiki: 
> http://www.coreboot.org/Developer_Manual/Tools/Dual_Flash
> It lists a neat trick to double stack two spi flash modules to make 
> testing/developping/flashing coreboot easier. However there's no
> schematic or other information available on how to actually build
> this setup. Could the author possibly supply this extra information?
> Since not even the resitor values or switch connection is documented.

I'm not the author but there is documentation at


for what is called the "simple" modification.

Resistor values are generally not critical and the switch connection
should be obvious after study of the flash chip data sheet.


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