NBCF_BC_ENABLE
nb->nb_flags &= ~(NBCF_NS_ENABLE | NBCF_BC_ENABLE);
nb->nb_flags |= NBCF_BC_ENABLE;
ctx->nb_flags |= NBCF_BC_ENABLE;
if (ctx->nb_flags & NBCF_BC_ENABLE) {
if ((ctx->nb_flags & NBCF_BC_ENABLE) &&