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Altera_Forum's avatar
Altera_Forum
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19 years ago

Boot problem : change exception address

Hello I have some problem with NIOS software. I made a boot loader using on chip memory. Reset and application code are set in on-chip memory. Application is downloaded in SDRAM and when th...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Hi,

I have a very similar problem as well. My configuration is the following:

- Single NiosII processor

- Small on-chip memory that contains a bootloader (that reads the main program from an SD card and copies that to DDR memory)

- DMA controller

- Another small on-chip memory for DMA to use

- 128Mb DDR memory

The NiosII processor is configured to reset from the on-chip memory and that works perfectly, interrupts and all. It even successfully loads the main program to the DDR memory and then jumps there. However interrupts do NOT work anymore. I believe I should somehow copy/reconfigure the exception vector from the main program to the nios processor, or have the processor move its exception vector to point to the proper location in the DDR memory, but how?

Any help would be much appreciated

- Teemu