Problem with QUARTUS II 9.1 SOPC & NIOS II character LCD

First you need to check if you have enough memory, if you use the On-chip memory it cannot work with printf() function, you should try to insert SDRAM in SOPC builder and then you have to assign pins correctly to connect your external SDRAM and the Nios with quartus, after you can check if the memory is working well. After you can try to start it again your project to display something on the screen. Good luck !