Hi,
I was searching the same question as above, forget all the above!!!
You can use any arduino as an ISP to bootload the smd 328p-au at 5volt and 16mhz. (I used the arduino uno)
- Upload the sketch Arduino as ISP.
- Get the right connections of mosi, miso, sck, reset
- Choose in the board menu: Arduino Mini w/ ATmega328
If you get an error, your connections are bad.
Have Fun!!!