Nico Huber has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/28804 )
Change subject: dediprog: Enable 4BA support for SF600, protocol V2 ......................................................................
Patch Set 2:
Did you test the native instructions only? e.g. you could remove the native flags / erase functions (and in another step the enter 4BA flags) for your chip to test different paths.
I think so... I tried with only FEATURE_4BA_NATIVE enabled and I also tried with only FEATURE_4BA enabled, the former should have used native instructions only, right?
Alas, FEATURE_4BA includes _NATIVE and the latter is automatically selected if available. So it's likely you tested native instructions twice.