you must to overwrite some funcation below
xmodem_fun_handle_t gp_xmodem_fun ={ uartreadnoblock, uartsendnoblock, sysTimerClr, sysTimerGet, NULL,
};
just call this funcation "xmodem1k_client(boot_data_program,&gp_xmodem_fun,100,1000)" to start client.