The FTDI FT2232H Mini-Module Evaluation Kit ( datasheet) can be used with flashrom for programming SPI chips. On older flashrom versions the syntax was: You have to invoke flashrom with the following parameters: All GND pins should be connected together ( pins 1 and 10 on the DLP-USB1232H, pin 8 on the SPI chip, pin 1 on the voltage regulator).The WP# and HOLD# pins should be tied to VCC! If you leave them unconnected you'll likely experience strange issues.
#USB SPI PROGRAMMER PDF#
See the schematics for details (you can also download the schematics as PDF for easier printing). In order to use the DLP-USB1232H device as SPI programmer you have to setup a small circuit (e.g. DLP-USB1232H based SPI programmer schematics