R21A_MAX_NRXCHAINS
uint32_t saved_rf_vals[nitems(r21a_iq_rf_regs) * R21A_MAX_NRXCHAINS];
KASSERT(sc->nrxchains <= R21A_MAX_NRXCHAINS,
("nrxchains > %d (%d)\n", R21A_MAX_NRXCHAINS, sc->nrxchains));