I am new to the mailing list so I am not sure if this is the right place for these. My company used the SST25VF512A in a project and I was able to configure flashrom to work with this chip using a buspirate (HW v3.5, FW v6.2 beta). The chip was already listed in flashchips.h so I just added the proper information to flashchips.c. Probe, read, write, and erase all work fine for me, albeit slowly because the AAI supported by the chip uses a different command than the one used in flashrom.