asbtm_banksel
int asbtm_banksel(struct asbtm_softc *, u_int8_t, u_int8_t *);
if (asbtm_banksel(sc, 0, &orig_bank) == -1) {
if (asbtm_banksel(sc, orig_bank, NULL) == -1) {
if (asbtm_banksel(sc, 0, &orig_bank) == -1) {
asbtm_banksel(sc, orig_bank, NULL);