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Junki's avatar
Junki
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3 years ago

NiosⅡ Processor Booting from SDRAM to OCRAM using Boot Copier

I want to copy a NiosⅡ application from SDRAM(not Flash Memory) to NiosⅡ OCRAM using Boot Copier. But, the following official manual do not describe how to boot from SDRAM. https://www.intel.com/...
KellyJialin_Goh's avatar
KellyJialin_Goh
Icon for Frequent Contributor rankFrequent Contributor
3 years ago

Hi,

Any updates from your side regarding the boot copier?


Regards,

Kelly


  • Junki's avatar
    Junki
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    3 years ago

    I have checked this link, but I still don't understand in detail.

    https://www.intel.com/content/www/us/en/docs/programmable/683820/current/nios-ii-processor-boot-copier.html

    Does that mean it's not possible to copy NIOS application from DDR to OCRAM using Memcpy based Boot Copier?

    I hope that copying from DDR can be realized by the following method.
    ・Set the NIOS Reset Vector to DDR address, and Exception Vector to OCRAM.
    ・On NIOS Ⅱ SBT, set all Linker Region Names to OCRAM (.text, .data, .bss, .exceptions, etc.)
    ・Generate .flash file with "elf2flash" on NIOS command shell
    ・Save .flash file in DDR and load from NIOS processor.
    ・Boot Copier starts, NIOS application is copied from DDR to OCRAM and executed.

    *If Boot Copier cannot be used, it is necessary to insert my original loader into the NIOS Reset Vector.

    I'm aware that alt_load should be enabled in this case. (However, unfortunately .text cannot be copied to OCRAM)