I want to control UART device through serial 0 of the M5stack.
But M5stack output string (status information?) to the serial 0 at the timing of power on and reset. This string cause error of the UART device. So I want to stop this output. The string is like following.

ets Jun 8 2016 00:22:57

rst:0x1 (POWERON_RESET),boot:0x17 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0018,len:4
load:0x3fff001c,len:1100
load:0x40078000,len:9232
load:0x40080400,len:6400
entry 0x400806a8
M5Stack initializing...OK

Even if the program is just only initializing process, the string is output. I am very confusing that. How can I stop it?

#include <M5Stack.h>
//HardwareSerial Myserial(0);

void setup() {
// put your setup code here, to run once:
M5.begin(true, false, true);
serial.begin(115200);
}

void loop() {
// put your main code here, to run repeatedly:
delay (100);
}