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Altera_Forum's avatar
Altera_Forum
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12 years ago

Nios II, Reset Vector : SDRAM => ok, EPCS => failed

Good morning all, I have a little problem with the nios II. In my design I use an external SDRAM, I used it as Reset Vector and it work just find. Now my software is ended, I want to...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

There is probably an error in your link script. The EPCS controller contains a bootloader in ROM, which is at address 0x4005000. As it is ROM, it can't be rewritten, so you get this error.

I don't know how Eclipse generates the BSP, but you should check the link sections for your project. All of them should be in the SDRAM. The only exception is .reset, which is IIRC hardware defined and will be the EPCS controller. The .entry section, on the other hand (I think it's called that), should be in SDRAM. The bootloader in the EPCS controller will copy the data from the EPCS to the SDRAM and jump to .entry