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Altera_Forum's avatar
Altera_Forum
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15 years ago

Changing the bootloader HEX file in the NIOS II IDE

This is with NIOS II 8.1 although I'll be moving to 10.1 and will need to do this: I'm trying to use a custom bootloader (loaded in EPCS) without changing the hardware (in SOPC Builder). The r...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

The nios reset vector could point to one of two places:

1) Somewhere in EPCS memory

2) Into a 'private' M9K/M4K memory block within the EPCS interface block.

If you look carefully at the SOPC builder page it ought to be possibly to work out which, I suspect the latter.

This boot code will then copy the data from the EPCS memory into appropriate other places.

It might be that some of the copying is actually done by code from within the program image - you'll probably need to disassemble the elf program file to see it.