Hi guys, has past a lot of time since my last inquiry!
Recently has appeared a ultra-cheap board named Raspberry Pi (perhaps you know http://www.raspberrypi.org/ ). This board has a powerful broadcom SoC that comes with USB, UART, I2C, SPI, GPIO ports... all for 25/35$, awsome. It could be a really versatile and powerful external/independent programmer for flashrom!
Just take a look here: http://elinux.org/RPi_Low-level_peripherals
The SPI bus could be used to program SPI flash chips (obviously) and GPIO for the other types. I propose two ideas, first one, support the board by flashrom software, second one, develop a daughter-board for the Raspberry-Pi to make a easy use of all (with sockets to program IC's or some buffers if necessary for other ones).
That's all, greetings!
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cmd_