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Altera_Forum
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12 years ago

DE0 Nano with SDRAM and EPCS not loading firmware

I have configured the DE0 Nano with a SDRAM, EPCS, and ALTPLL combo that phase shift the SDRAM clock -3ns as required. When I use the flash programmer it completes flashing successfully, restarting t...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

NVM, got the sdram working, the problem was i needed to set the Qsys component CPU Nios II/e with reset vector and exception vector set as: epcs, and onchip_memory respectively. (I am also using the university IP DE series clocks to do the -3ns phase shift required for SDRAM.

To reduce program size I unchecked enable_c_plus_plus and checked enable_small_c_library in BSP editor. this reduced program size by 2KBytes. Everything still works, it flashes and loads firmware fine.

There is however a problem that if i edit application and BSP properties and set optimization level to 2 , after i use flash programmer the system does not seem to load firmware. I wonder why, a bug?