Cannot upload Arduino Nano Serail1.print to ATtiny2313

hi every one,
    after can use arduino nano isp (arduino 1.6.5), had tested upload blink sketch attiny2313 via arduino nano isp ,it works fine , can check voltage up/down @ pin b4 or pin set.

    when use hardware txd/rxd pin 1/pin0, arduino 1.6.5 ,it error on time.
   
    testing, can upload when use serial.print ("xxx"); usb port not pin0/1.


    expert / body advise me ,how upload serial1 port attiny2313 via  arduino nano isp ?


     my passed experiments.
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     experiment1 code:

   void setup() {               
   serial1.begin(9600);
}

void loop() {
  serial1.print("stuff");
 
}

error : serial1 not declared in scope

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 experiment2 code:

#include <softwareserial.h>
// definitions
#define rxpin 0
#define txpin 1

softwareserial myserial(rxpin, txpin);


// setup routine runs once when press reset:
void setup() {               
  myserial.begin(9600);
}

// loop routine runs on , on asensorpingain forever:
void loop() {
  myserial.print("stuff");
  myserial.println();
}

error : sketch big;see http://www.arduino/en/guide/troubleshooting size tips reducing it.

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 could expert / body advise me ,how upload serial1 port attiny2313 via  arduino nano isp ?
   
    preecha r.



       

     

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