Thank you Peter for the details. Yes it is identifying it as opaque flash chip. We are able to completely read it but erase fails.
I understood from the logs of flashrom that SMM protection is enabled. Working on it to disable it.
You will also need to enable host CPU write access to other regions you with to be writeable. From your earlier e-mail it appears that you've already done this for the ME region, however you'll need to do it for IFD and other regions you wish to update. Be advised, however, that *not* locking certain regions may cause the ME to behave differently.
You can also target specific regions for updates using `--ifd -i <region> -N`, for example `--ifd -i bios -N` will make flashrom only attempt to write and verify the BIOS region (without -N flashrom will attempt to verify the entire chip contents).