The validate memory layout operation validates the start and end addresses of the memory layout. It does not validate the sector sizes, because you can't do that without erasing the flash memory.

The 800BB and 800BT memory layouts only differ in where the "boot blocks" are located. The BB layout has small sectors at the bottom, and the BT layout has small sectors at the top.

The difference between the BB and BT layouts only matter for the purpose of erasing flash. Flash memory chips can only erase entire memory sectors. When reading the flash memory, the sector layout makes no difference.

I update the wiki page with the correct references for the 2.7T engines I tested to use the 29F800BB memory layout.

If you try to write to the ECU and use the wrong memory layout, then writing should fail immediately before anything has been erased or written. This is because the sector sizes won't match, and the ECU will not be able to erase a region of memory that doesn't match a specific sectors size.

The only way you can end up using the wrong memory layout, is if you use one that has the correct sector layout and sizes, but is the wrong total size. What I mean by that is using the 400BB layout when your ECU has an 800BB chip in it. But you can detect this situation now by running the Validate Memory Layout operation.

Memory layouts are installed with the NefMoto flashing software in the memory layouts sub directory.