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Altera_Forum
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19 years ago

Program goes back to reset address

Hello all, I wrote my own boot loader based on Altera's example boot loader. The biggest differences are that my boot loader uses a defined address to load the program code and I use ldw in...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
19 years ago

Your first test (stw, ldw) tests your data cache, not SDRAM, so you should probably ignore it. Your second test tests SDRAM. I'm not a hardware engineer, but I'd try stwio, wait a few clocks, then ldwio, and see what happens. Succeed or fail, there's still probably an issue with your SDRAM.

I haven't tried this, but it may be possible for the data cache to "cache" empty address space. So, you could be using the wrong address.