OK, took me a bit of time. I think I got it. Here are different kexts for you to try. I patched all the places it looks for Atmel's manufacturer ID, PMC's ID, and Winbond's ID in the three kexts in this zip file. Hopefully one of them will do the trick.
I thought about it some more and although writing to the chips is generally exactly the same, the problem may also be that the sectors are write protected and it's trying to unprotect them (I believe the exact procedure for enabling/disabling write protection can also be a manufacturer-specific thing). If I can take some time to better understand what the assembly code is doing, I might be able to help further with figuring out what the code is actually telling the chip to do.
If you try a kext and it doesn't work, I'd probably recommend rebooting just to make sure the remnants of the previous try aren't hanging around...
PatchedKexts.zip
I thought about it some more and although writing to the chips is generally exactly the same, the problem may also be that the sectors are write protected and it's trying to unprotect them (I believe the exact procedure for enabling/disabling write protection can also be a manufacturer-specific thing). If I can take some time to better understand what the assembly code is doing, I might be able to help further with figuring out what the code is actually telling the chip to do.
If you try a kext and it doesn't work, I'd probably recommend rebooting just to make sure the remnants of the previous try aren't hanging around...
PatchedKexts.zip