You Reply: Checking [b]boards.txt[/b], i found that "Arduino Pro or Pro Mini (5V, 16 MHz) w/ ATmega328" and "Arduino Duemilanove or Nano w/ ATmega328" got same definition ^^.
To have things more clear on Arduino IDE i just made this entry.
[code]xboard.name=Arduino Xboard-A by DFRobot Atmega328P low voltage version (16Mhz)
xboard.upload.protocol=stk500
xboard.upload.maximum_size=30720
xboard.upload.speed=57600
xboard.bootloader.low_fuses=0xFF
xboard.bootloader.high_fuses=0xDA
xboard.bootloader.extended_fuses=0x05
xboard.bootloader.path=atmega
xboard.bootloader.file=ATmegaBOOT_168_atmega328.hex
xboard.bootloader.unlock_bits=0x3F
xboard.bootloader.lock_bits=0x0F
xboard.build.mcu=atmega328p
xboard.build.f_cpu=16000000L
xboard.build.core=arduino
[/code]
All works nice.
Thx for your quick and good answer Hector.
If finally i atempt to use Optiboot loader ill known here.