NIOS II relocation types

Altera_Forum · ‎02-08-2006

Hi, I am a student and I am doing my diploma work at the moment. It is about loading elf file on a NIOS II board - I have problems with the relocation that is done as part of the loading of an elf file - for instance I dont know the relocation types and what are the rules for relocation in each different relocation type - I suppose I need some special dosumentation which I am not able to find at this exact moment - Thank you in advance for your help!

Altera_Forum · ‎02-08-2006

Hi dimo,

> I have problems with the relocation that is done as part of the loading of an elf file

What problems are you having?

> for instance I dont know the relocation types

If you use nios2-download, you don't need to know anything about elf relocation types.

Or are you writing your own loader?

> I suppose I need some special dosumentation which I am not able to find at this

> exact moment

Try: http://www.cs.princeton.edu/courses/archiv...reading/elf.pdf (http://www.cs.princeton.edu/courses/archive/fall05/cos217/reading/elf.pdf)

Regards,

--Scott

Altera_Forum · ‎02-08-2006

Hi, Scott - yes I am writing my own elf loader - the pdf that you sent me was my main source of information - My problem is that I dont know the rules that applies for the different reltypes in Nios Architecture.

Altera_Forum · ‎02-09-2006

Hi dimo,

> I dont know the rules that applies for the different reltypes in Nios Architecture.

Sorry I can't be of more help here -- I'm not sure where you can get the details

you're looking for ... other than by digging into the binutils code.

Regards,

--Scott

Altera_Forum · ‎02-09-2006

Hi dimo,

we developed our ELF bootloader with the exact same spec

that Scott provided. Originally for a different soft-core but

it works for NIOS II as well.

Our loader relocates all sections with the type that has SHT_PROGBITS

and SHF_ALLOC flag set.

To save some space you can run your ELF trough strip first,

but not required.

Cheers, Roger

Altera_Forum · ‎02-09-2006

--- Quote Start ---

originally posted by rsteiner@Feb 9 2006, 07:37 AM

hi dimo,

we developed our elf bootloader with the exact same spec

that scott provided. originally for a different soft-core but

it works for nios ii as well.

our loader relocates all sections with the type that has sht_progbits

and shf_alloc flag set.

to save some space you can run your elf trough strip first,

but not required.

cheers, roger

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http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/biggrin.gif

Altera_Forum · ‎02-09-2006

hi: http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/tongue.gif