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Re: Re: eCos linking question
On Feb 20, 2008 2:58 PM, Gary Thomas <gary@mlbassoc.com> wrote:
>
> Andrew Lunn wrote:
> >> So .data and .bss get addresses from the internal RAM.. but I don't
> >> get why, they should get addresses from ROM, following
> >> .gcc_except_table. According to the startup assembly code, these
> >> sections should then get copied into ram at startup.
> >> I know I need to use the internal ram too, since the exception vectors
> >> (.rom_vectors and .fixed_vectors) need to start at address 0x0.
> >> I think it should be possible to run code from my external flash or am
> >> I mistaken?
> >> Any suggestions would be greatly appreciated.
> >
> > Make sure you install/lib/target.ld is up to date. I think the
> > dependencies are broken, so it does not get remade when you change the
> > .ldi files etc.
>
> Also, give the .ld file a good look - it's saved as the result of
> the preprocessing, so all of your macros should have been expanded.
> This way you can see if it really looks like you think it should.
>
> --
> ------------------------------------------------------------
> Gary Thomas | Consulting for the
> MLB Associates | Embedded world
> ------------------------------------------------------------
>
Thanks.
I've been looking at the eb55 platform (ARM7 with EBI from Atmel),
there the .data section is specified as follows in the LDI file:
SECTION_data (ram, 0x02000000, FOLLOWING (.gcc_except_table))
I've also specified my ram address in my LDI file now, and it links
and compiles now (5 seconds of glory ;)
Now on to the flash programming and actual testing..
Tom
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