mfi_pd_ref
union mfi_pd_ref ref;
union mfi_pd_ref ref;
union mfi_pd_ref ref; /* 0xffff == missing drive */
mbox_store_pdref(uint8_t *mbox, union mfi_pd_ref *ref)
void mbox_store_pdref(uint8_t *mbox, union mfi_pd_ref *ref);