you can see below sucessful tested types. we can fill the list, if you send a list of your tested flashproms.
for a list of implemented types do a

"cat /proc/flashprom/supported_types".

AMD    Advanced Micro Devices, Inc.
AM28F010A
AM29F010
AM29F040A
AM29F040B

Atmel    Atmel
AT29C256/257
AT29C010A
AT29C020
AT29C040A
AT49BV512

Catalyst   Catalyst
CAT28F010

Hynix

Intel   Intel
i28F001T
i28F020

    Macronix International Co.
MX28F1000P

    Silicon Storage Technology, Inc.
PH29EE010
SST29EE010
SST39VF512
SST39SF020

   STMicroelectronics

  Winbond Electronics Co.
W29EE011
W29C020P
W49F002U