I have developed a module for interfacing Winbond serial flash (w25Q series). have successfully tested it with a W25Q80BV (8 Mbit) chip. On an Espruino Pico, for many applications this chip makes a great alternative to hooking up an SD card, since the chip is tiny and costs only a few cents.
My module supports erasing the chip, erasing a sector, writing a page, sequential writing and sequential reading. There is no documentation yet, but essential comments in the source code. You should be able to use it if you generally know how flash memory works.
I put the code on github for now. We can add it to the Espruino module library once it reaches a more mature state.
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