objcopy problem with tic4x architecture

objcopy problem with tic4x architecture

[Aschwin Gopalan]

I try to produce a binary file (to loaded into the dsp) using
objcopy from a coff2-c4x fully linked object file. As soon as I use
-O binary (or any of the Hex output formats) the following happens:
The Adresses in the coff file are addressing 32-bit wide memory. The 
adresses are put directly into the output file, but without multiplying 
them by four to address the correct *byte* in the file, resulting in 
overlapping sections. What should I do?


Aki
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Re: objcopy problem with tic4x architecture

[Svein E. Seldal]

Aschwin Gopalan wrote:
> I try to produce a binary file (to loaded into the dsp) using
> objcopy from a coff2-c4x fully linked object file. As soon as I use
> -O binary (or any of the Hex output formats) the following happens:
> The Adresses in the coff file are addressing 32-bit wide memory. The 
> adresses are put directly into the output file, but without multiplying 
> them by four to address the correct *byte* in the file, resulting in 
> overlapping sections. What should I do?
> 

Hi,

Do you have a simple testcase to prove your point, please?

The problem with tic4x has always been that it is unaware of bytes. The 
host must use 4 native storeage elements (i.e. bytes) to store one of 
the target's native storeage element (i.e. a 32-bit word). This problem 
arises when you are working with the output formats, like you do. Should 
they apply to the host, i.e. multiply the addresses with four, or should 
they apply to the target, like they do today. Beacause if you are to 
flash this binary image (or ihex for that matter) into a 32-bits flash 
which is connected to the DSP, well, then the image is correct AFAICS.

The same applies to your question about gdb; getting a gdb patch up and 
running is simple enough - but the main gdb requres a lot of changes as 
the host is byte addressable, while the target is 32-bit addressable. As 
for your question; no I do not have any working source. I plan on make 
one, but I'm too busy at the moment.


Regards,
Svein