static int str9xpec_handle_part_id_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 {
-       flash_bank_t *bank;
        scan_field_t field;
        uint8_t *buffer = NULL;
        jtag_tap_t *tap;
        str9xpec_flash_controller_t *str9xpec_info = NULL;
 
        if (argc < 1)
-       {
                return ERROR_COMMAND_SYNTAX_ERROR;
-       }
 
-       bank = get_flash_bank_by_num(strtoul(args[0], NULL, 0));
-       if (!bank)
-       {
-               command_print(cmd_ctx, "flash bank '#%s' is out of bounds", args[0]);
-               return ERROR_OK;
-       }
+       flash_bank_t *bank;
+       int retval = flash_command_get_bank_by_num(cmd_ctx, args[0], &bank);
+       if (ERROR_OK != retval)
+               return retval;
 
        str9xpec_info = bank->driver_priv;
        tap = str9xpec_info->tap;
 
 static int str9xpec_handle_flash_options_read_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 {
-       flash_bank_t *bank;
        uint8_t status;
        str9xpec_flash_controller_t *str9xpec_info = NULL;
 
                return ERROR_OK;
        }
 
-       bank = get_flash_bank_by_num(strtoul(args[0], NULL, 0));
-       if (!bank)
-       {
-               command_print(cmd_ctx, "flash bank '#%s' is out of bounds", args[0]);
-               return ERROR_OK;
-       }
+       flash_bank_t *bank;
+       int retval = flash_command_get_bank_by_num(cmd_ctx, args[0], &bank);
+       if (ERROR_OK != retval)
+               return retval;
 
        str9xpec_info = bank->driver_priv;
 
 
 static int str9xpec_handle_flash_options_write_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 {
-       flash_bank_t *bank;
        uint8_t status;
 
        if (argc < 1)
                return ERROR_OK;
        }
 
-       bank = get_flash_bank_by_num(strtoul(args[0], NULL, 0));
-       if (!bank)
-       {
-               command_print(cmd_ctx, "flash bank '#%s' is out of bounds", args[0]);
-               return ERROR_OK;
-       }
+       flash_bank_t *bank;
+       int retval = flash_command_get_bank_by_num(cmd_ctx, args[0], &bank);
+       if (ERROR_OK != retval)
+               return retval;
 
        status = str9xpec_write_options(bank);
 
 
 static int str9xpec_handle_flash_options_cmap_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 {
-       flash_bank_t *bank;
        str9xpec_flash_controller_t *str9xpec_info = NULL;
 
        if (argc < 2)
                return ERROR_OK;
        }
 
-       bank = get_flash_bank_by_num(strtoul(args[0], NULL, 0));
-       if (!bank)
-       {
-               command_print(cmd_ctx, "flash bank '#%s' is out of bounds", args[0]);
-               return ERROR_OK;
-       }
+       flash_bank_t *bank;
+       int retval = flash_command_get_bank_by_num(cmd_ctx, args[0], &bank);
+       if (ERROR_OK != retval)
+               return retval;
 
        str9xpec_info = bank->driver_priv;
 
 
 static int str9xpec_handle_flash_options_lvdthd_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 {
-       flash_bank_t *bank;
        str9xpec_flash_controller_t *str9xpec_info = NULL;
 
        if (argc < 2)
                return ERROR_OK;
        }
 
-       bank = get_flash_bank_by_num(strtoul(args[0], NULL, 0));
-       if (!bank)
-       {
-               command_print(cmd_ctx, "flash bank '#%s' is out of bounds", args[0]);
-               return ERROR_OK;
-       }
+       flash_bank_t *bank;
+       int retval = flash_command_get_bank_by_num(cmd_ctx, args[0], &bank);
+       if (ERROR_OK != retval)
+               return retval;
 
        str9xpec_info = bank->driver_priv;
 
 
 int str9xpec_handle_flash_options_lvdsel_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 {
-       flash_bank_t *bank;
        str9xpec_flash_controller_t *str9xpec_info = NULL;
 
        if (argc < 2)
                return ERROR_OK;
        }
 
-       bank = get_flash_bank_by_num(strtoul(args[0], NULL, 0));
-       if (!bank)
-       {
-               command_print(cmd_ctx, "flash bank '#%s' is out of bounds", args[0]);
-               return ERROR_OK;
-       }
+       flash_bank_t *bank;
+       int retval = flash_command_get_bank_by_num(cmd_ctx, args[0], &bank);
+       if (ERROR_OK != retval)
+               return retval;
 
        str9xpec_info = bank->driver_priv;
 
 
 static int str9xpec_handle_flash_options_lvdwarn_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 {
-       flash_bank_t *bank;
        str9xpec_flash_controller_t *str9xpec_info = NULL;
 
        if (argc < 2)
                return ERROR_OK;
        }
 
-       bank = get_flash_bank_by_num(strtoul(args[0], NULL, 0));
-       if (!bank)
-       {
-               command_print(cmd_ctx, "flash bank '#%s' is out of bounds", args[0]);
-               return ERROR_OK;
-       }
+       flash_bank_t *bank;
+       int retval = flash_command_get_bank_by_num(cmd_ctx, args[0], &bank);
+       if (ERROR_OK != retval)
+               return retval;
 
        str9xpec_info = bank->driver_priv;
 
 static int str9xpec_handle_flash_lock_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 {
        uint8_t status;
-       flash_bank_t *bank;
 
        if (argc < 1)
        {
                return ERROR_OK;
        }
 
-       bank = get_flash_bank_by_num(strtoul(args[0], NULL, 0));
-       if (!bank)
-       {
-               command_print(cmd_ctx, "flash bank '#%s' is out of bounds", args[0]);
-               return ERROR_OK;
-       }
+       flash_bank_t *bank;
+       int retval = flash_command_get_bank_by_num(cmd_ctx, args[0], &bank);
+       if (ERROR_OK != retval)
+               return retval;
 
        status = str9xpec_lock_device(bank);
 
 static int str9xpec_handle_flash_unlock_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 {
        uint8_t status;
-       flash_bank_t *bank;
 
        if (argc < 1)
        {
                return ERROR_OK;
        }
 
-       bank = get_flash_bank_by_num(strtoul(args[0], NULL, 0));
-       if (!bank)
-       {
-               command_print(cmd_ctx, "flash bank '#%s' is out of bounds", args[0]);
-               return ERROR_OK;
-       }
+       flash_bank_t *bank;
+       int retval = flash_command_get_bank_by_num(cmd_ctx, args[0], &bank);
+       if (ERROR_OK != retval)
+               return retval;
 
        status = str9xpec_unlock_device(bank);
 
 
 static int str9xpec_handle_flash_enable_turbo_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 {
-       int retval;
-       flash_bank_t *bank;
        jtag_tap_t *tap0;
        jtag_tap_t *tap1;
        jtag_tap_t *tap2;
                return ERROR_OK;
        }
 
-       bank = get_flash_bank_by_num(strtoul(args[0], NULL, 0));
-       if (!bank)
-       {
-               command_print(cmd_ctx, "flash bank '#%s' is out of bounds", args[0]);
-               return ERROR_OK;
-       }
+       flash_bank_t *bank;
+       int retval = flash_command_get_bank_by_num(cmd_ctx, args[0], &bank);
+       if (ERROR_OK != retval)
+               return retval;
 
        str9xpec_info = bank->driver_priv;
 
 
 static int str9xpec_handle_flash_disable_turbo_command(struct command_context_s *cmd_ctx, char *cmd, char **args, int argc)
 {
-       flash_bank_t *bank;
        jtag_tap_t *tap;
        str9xpec_flash_controller_t *str9xpec_info = NULL;
 
                return ERROR_OK;
        }
 
-       bank = get_flash_bank_by_num(strtoul(args[0], NULL, 0));
-       if (!bank)
-       {
-               command_print(cmd_ctx, "flash bank '#%s' is out of bounds", args[0]);
-               return ERROR_OK;
-       }
+       flash_bank_t *bank;
+       int retval = flash_command_get_bank_by_num(cmd_ctx, args[0], &bank);
+       if (ERROR_OK != retval)
+               return retval;
 
        str9xpec_info = bank->driver_priv;
        tap = str9xpec_info->tap;