Calling PRIMM will break when not in ROM bank 0.

[Yazwh0]

Unlike other kernel functions such as BSOUT.

I can understand why, given PRIMM uses data after the return address on the stack, so using the trampoline would be problematic.

[mooinglemur]

Not sure if this will ever be fixed fully, as PRIMM would have to be modified to understand all possible variations of the jsrfar stack frame in order to unwind it.

It's probably best left as a documentation item for now.