Problems with Nios II

[Altera_Forum]

Hi all 

I'm new in using nios II and I have some problems:  after generating system on SOPC Builder with:  - nios 2/f - jtag uart - pio (output, 1 bit) - sysid - onchip_memory  i open nios 2 SBT and select the template hello world. Now:  - if i build the pjt, the error is   "on chip memory overflowed by xxx bytes"  i solved it entering in the BSP editor , unchecking  - enable c++ - enable clean exit - enable exit   and checking  - enable small c library - enable reduced device drivers  than generate BSP. That's ok?  But if i add to hello world.c  # include "system.h"# include "altera_avalon_poi_regs.h" and the other code suggested in "my first nios II software design" to let blink a led,next to the 2 added include i have a question mark that says "unresolved inclusion" and gives me error in building pjt ("undefined reference to main")  someone can help?  (the only code that i run without problems is hello world small...)  n.b: my hardware is altera DE2 board (cyclone 2), and my sw, quartus 2 10.1 and last version of nios2 SBT

[Altera_Forum]

The first problem seems due to the fact the initial code didn't fit into onchip_memory. Enabling small C lib and reduced drivers generates a code with smaller footprint. If you need the complete lib and drivers you may try to implement a bigger onchip mem, provided your device has it. 

 The second problem probably indicates that thelinker can't find the main() entry point. Does your project use main or alt_main? Last remark: you wrote "altera_avalon_poi_regs.h"; is this a mistype or is really like this in your code? It should be altera_avalon_pio_regs.h  Regards

[Altera_Forum]

Thanks for your fast answer! 

 - to implement a bigger on chip memory i have to set a higher number of bytes or select a different one?  - my pjt use main() i have to change it?  - yes, "poi" is a mistype!

[Altera_Forum]

--- Quote Start ---   - to implement a bigger on chip memory i have to set a higher number of bytes or select a different one?   --- Quote End ---   Right. Set a bigger size in sopc builder, changing onchip mem properties.  Regarding the other issue, using main is correct.  Probably you have some something wrong in linker script.  I still use Quartus 9 and Nios IDE, so I can't help you much with Quartus 10 and Nios SBT

[Altera_Forum]

Please use DE2 SSRAM or SDRAM. Onchip RAM will not fit at all.