At the moment, the best way is probably* to:
- read the existing firmware from the BIOS chip using a SOIC-8 clip and reader (as mentioned by
teo_meuz in an earlier post to this thread; and - build the Librem variant of the Coreboot firmware from source; and
- compare the two, using
difforcmpor similar.
If anyone else knows a better way, please post it. Thanks.
* I haven’t yet confirmed this.