Compiler/TMS320F28377S: Linker Command File RAM allocation.

Luke Chen

Part Number: TMS320F28377S

Tool/software: TI C/C++ Compiler

Hi all,

I am testing TMS320F28377S project with CGT v16.9.3.LTS, just create a new F28377S project for evaluation and I find a problem.

We can see below RAM allocation in .cmd file PAGE1, if we modify the length of RAMGS12 to 0x002000, we will get an error message when building the project due to memory overlap.

   RAMGS10     : origin = 0x016000, length = 0x001000
   RAMGS11     : origin = 0x017000, length = 0x001000
   RAMGS12     : origin = 0x018000, length = 0x001000
   RAMGS13     : origin = 0x019000, length = 0x001000

But, if I modify RAMGS12 length to 0x002000 and move it from PAGE1 to PAGE0, then I pass build process, no any error message. I tested several versions of C2000 CGT and got same results.

Is there any problem of CGT tool? Please advise your idea if any, thank you.

Best regards,

Luke Chen

over 8 years ago

0 Christopher Chiarella over 8 years ago

TI__Mastermind 30255 points

Luke

It thinks it is on separate memory pages, but C2000 is unified, so although you don't get a linking error, this could lead to serious problems.

processors.wiki.ti.com/.../C28x_Compiler_-_Understanding_Linking

Best regards
Chris

0 Luke Chen over 8 years ago in reply to Christopher Chiarella

TI__Expert 5090 points

Chris,

We can define memory allocations on PAGE0 and PAGE1, but compiler cannot detect this kind of memory overlap problem.

Is this a compiler/linker bug?

Regards
Luke

0 Christopher Chiarella over 8 years ago in reply to Luke Chen

TI__Mastermind 30255 points

Luke

I aligned with the compiler team confirming that the linker can't detect this because the point of pages is to allow memory regions to exist with the same address. C2000 still has pages in the linker due to rollover from legacy from before memory was unified. Not sure on timeline, but we'll be removing the pages from the linkers in the future to help avoid confusion and running into such issues.

Best regards
Chris

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Compiler/TMS320F28377S: Linker Command File RAM allocation.