Re: [avr-gcc-list] problem after relocate code to fix address

[zhao abl]

I test my project in AVR Studio4 + WINAVR.
Now i think it is the problem of the simulator .
when i simulate the .HEX file,it works good.
but when i simulate the .ELF file,the .data section can't be
initialized correctly. In the disassembler window ,i found that 
the "load_data" has been placed at "0x2034"(word address),
so i think something is wrong with the simulator.:)


> From: Erik Christiansen <address@hidden>
> To: zhao abl <address@hidden>
> CC: address@hidden
> Subject: Re: [avr-gcc-list] problem after relocate code to fix address
> Date: Fri, 9 Dec 2005 18:22:59 +1100
>
> On Fri, Dec 09, 2005 at 03:12:39AM +0000, zhao abl wrote:
> >    void putcinstr(uint8_t) __attribute__((section(".putsec")));
> >    Wl,--section-start=.putsec=0x4000
> >
> >  After i relocate a function to a fix address ,the .data section
> > can't be initialized correctly,all .data section has been initialized
> > with "0xff".
> >
> >  In the .map file:
> >      0x000004de                __data_load_start = LOADADDR (.data)
> >      0x000004e8                __data_load_end = (__data_load_start +
> > SIZEOF (.data))
> >  it seems that ,__data_load_start from 0x04de, but actually there is
> > nothing but "0xff".
> > the "load_data" has been placed at "0x2034"(word address),just followed 
the
> > relocated founction.
>
> Can you please post the output of "avr-objdump -h your_object_file" ?
> It would be useful to provide this for the case where
> --section-start=.putsec=0x4000, and again with no .putsec. We can then
> see if there really is some interference.
>
> The limited information available so far shows that the LMA of .data is
> indeed 0x04de. Where do you see '"0x2034"(word address)'?
> (In any case, when fiddling with the linker, it is better to work
> exclusively in byte adresses. It avoids confusion. ;-)
>
> Erik
>
> PS: The weekend starts any minute now. It'll be two days before I see your
> reply.

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