mxser_must_select_bank
u8 oldlcr = mxser_must_select_bank(baseio, MOXA_MUST_EFR_BANK0);
u8 oldlcr = mxser_must_select_bank(baseio, MOXA_MUST_EFR_BANK0);
u8 oldlcr = mxser_must_select_bank(info->ioaddr, MOXA_MUST_EFR_BANK1);
u8 oldlcr = mxser_must_select_bank(baseio, MOXA_MUST_EFR_BANK2);
u8 oldlcr = mxser_must_select_bank(baseio, MOXA_MUST_EFR_BANK2);