Significance of PAGEs in linker files (F2809, F28335 etc)

Stian Soevik

Hi, I am trying to understand more of the linker command files. I use mainly F2809 and F28335.

What exactly changes if I place memory in PAGE 0 instead of PAGE 1, and vice versa? Would code for some accesses be changed in order to access the data via memory bus or program bus? Or would program code fail to run if it's placed in PAGE 1?

Since there is only one address space, I suppose the data would mainly be placed in the same position regardless of page.

I also wonder about the significance of giving PAGE=0 or PAGE=1 in SECTIONS.

In which cases would it not matter, and in which cases would there be a difference?

over 11 years ago

Igor Gorbachev over 11 years ago

Guru 20525 points

Hi,

Try to go through this link http://processors.wiki.ti.com/index.php/C28x_Compiler_-_Understanding_Linking.

Regards,

Igor

Stian Soevik over 11 years ago in reply to Igor Gorbachev

Expert 1295 points

Thank you, I have read that one as well as some of the linker manual. However, what I get from the wiki, is that some legacy third party tools rely on the pages, but not what else would really be changed.

If not using these legacy tools, could I place all memory in e.g. PAGE 0?

Igor Gorbachev over 11 years ago in reply to Stian Soevik

Guru 20525 points

Well, it reminds me an approach used at COM programs for x86 :), when program has one segment only, all data must be defined in the code segment and a stack is generated automatically. Honestly, I don't know, whether it is possible something similar for C2000. At least I don't have the similar experience. Maybe TI employees will clear...

Regards,

Igor

Stian Soevik over 11 years ago in reply to Igor Gorbachev

Expert 1295 points

This is still unclear to me. Can someone from TI respond?

Archaeologist over 11 years ago in reply to Stian Soevik

TI__Guru* 84285 points

The pages are irrelevant for C28x. Some targets have distinct memory spaces for code (usually page 0) and data (usually page 1), and you need to get it right on those targets. However, C28x has a unified memory space, so you can use whatever page you like. I recommend just leaving off the page specifier entirely.

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Significance of PAGEs in linker files (F2809, F28335 etc)