Marzogh:
@jacky4566: Thanks for the heads up. Its good to know its working with the Teensys and with the AT25SL641. Have you had to make any mods to get the library to run on the Teensy?
No mods. Using default SPI pins since its a custom board I cant really test the alternate pins. CPU clock 48MHz, SPI clock speed 12MHz. Power down works fine as well.