Well to answer your question from a technical point of view:

The ring buffers and IBs can be byte swapped by the MC, but in difference to
older generations the hardware does no actively support big endian
architectures any more.

So you need to do all the byte swapping on the driver side before giving the
data to the hardware.

Linux support for big endian architectures are only done best effort. So we can
help develop features and fix bugs, but don't actively spend time on coding
things.