but i still haven't understand , i want to make my own bootloader i took another code which toggle P1_5 and write it to the flash add 0x2000 and than i writeto sbs=ff and sbv=fc and point to add 2000=>(*((const void(code*)(void)) 0x2000 ))
,the add i start my second code but it just doesn't work,any help or application note about this subject(bootloader in ed2) will be helpful
thanks
koby


by the way the second code is:

#include <REG51xD2.h>
void main(void)
{
P1_5 =~P1_5;
}

and the bin file is:
0x02,0x40,0x03,0x78,0x7F,0xE4,0xF6,0xD8,0xFD,0x75,0x81,0x07,0x02,0x00,0x0F,0xB2,0x95,0x22