Seeking a faster alternative to the buspirate, the author created a dedicated SPI flash reader using a Teensy 2 or 3 and an 8-SOIC chip-clip. This reader can quickly read/write multi-megabit ROMs in just a minute. Pinout information for various chip packages is provided for easy attachment using a buspirate or dedicated chip clip. The reader should show up as a serial device on your computer and offers simple commands for reading chip ID, erasing sectors, and uploading bytes. The author also explores reverse engineering ROMs in more detail and highlights their Thunderstrike talk at 31c3. Last updated in November 2020.
https://trmm.net/SPI_flash/