Re: [ECOS] redboot elf loader

[Mark Salter <msalter at redhat dot com>]

>>>>> Gary Thomas writes:

> On Mon, 2003-09-29 at 08:17, Mark Salter wrote:
>> >>>>> Gary Thomas writes:
>> 
>> > On Mon, 2003-09-29 at 08:00, Mark Salter wrote:
>> >> >>>>> Gary Thomas writes:
>> >> 
>> >> > I'd suggest that you leave this to your startup code.  Have it copy the
>> >> > data from the VMA to the LMA - that's how we handle it in eCos.
>> >> 
>> >> Actually, we copy LMA to VMA. That is, for ROM startup the .data section
>> >> has a VMA in RAM and an LMA in ROM. I tend to believe that the ELF loader
>> >> should indeed be using LMA addresses.
>> >> 
>> 
>> > How could this work for this example - loading via LMA into memory
>> > that RedBoot clearly needs while running?
>> 
>> If that is the case, then the example is broken. My reading was that
>> the VMA was 0x0 and LMA was somewhere where the other parts of the
>> program lives. My point is that the LMA is where a loader should put
>> sections (Load Memory Address) and VMA is where the running program
>> actually accesses the sections.
>> 

> Agreed, and if LMA != VMA, then it would be up to the code (loaded 
> program) to relocate it as appropriate.  So, the real question becomes
> is the LMA stored in the p_paddr field (just making sure I understand
> the terminology)?  If so, then the patch from Artur would be the correct
> solution.

Yes, VMA == p_vaddr and LMA == p_paddr.

--Mark



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