HI
Not sure if I did it right or not but this is what I did so far.
Sanguinololu to communicate with my PC over USB
Download the Virtual Com Port USB drivers from
http://www.ftdichip.com/Drivers/VCP.htm, and unzip
At hardware detection, point to your driver folder from above. This will install a new com port (COM10 in my case)
Set my baud rate to 38400
firmware
Get the Marlin Firmware V1 and extract to marlin folder
Download the Arduino IDE from wiki 0.23 extrat to arduino folder
Download Sanguino-specific Arduino IDE files Extract to> arduino hardware folder
Open the Arduino IDE, select Board -> Sanguino W/Atmega128P *, then select tools -> serial port -> COM[10]
From the Arduino IDE, select File -> Open -> [Your Marlin directory] -> Marlin.pde to open the firmware for editing
Make sure the following is set in the Configuration.h file '#define MOTHERBOARD 62' to tell the firmware what hardware
Make any other changes to the Configuration.h
Select File -> Upload to transfer to your hardware
Error
avrdude: stk500_getsync(): not in sync: resp=0x00
avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51