The compiler aligns the data nicely anyway (it will just leave
a 1-byte hole where needed), so the packing is really irrelevant.
Apart of that, does the above suggest that some information/
code is now missing from the driver ?

It is perhaps an unnecessary removal which will need to be undone
anyway when I (or others) add the south bridge voltage sensor.
Everything is OK with that change now, but since the size of the
address struct or union is 32 bits anyway, I would not remove that
field.

Eugene