booting out of flash and starting out of DDR2

hi!

as far as i know, the ddr2 memory controller uses the first few bytes at startup to calibrate its timings for accesses and destroys data located there.

take a look at the controller user guide from altera http://www.altera.com/literature/ug/ug_ddr_ddr2_sdram_hp.pdf chapter 5, "The Testbench Stages".

additionally it's not the best practice to store initialisation data in volatile memories since you can't rely on the contents after startup or reset situation. collect these data dynamically from the used peripherals or store static data also in the flash.

greetz,

schafrichter