How to write data into DDR3 SDRAM-HPS!

https://www.alteraforum.com/forum/attachment.php?attachmentid=9331

The above shows the memory mapping of the FPGA into the ARM. Your FPGA has access to the physical address of the HPS SDRAM starting from 0x10_0000. Note however that the Qsys Avalon address bus to the HPS SDRAM port is only 29 bits wide instead of 32 bits. Thus, you can only access memory up to address 0xa000_0000 from the FPGA.

I recommend you look at the Macnica online video http://www.macnica-na.com/vworkshops/courses-altera-soc for a great tutorial on this subject.