CCS/TMS320C6678: How to load the same sections of different object files within one project with the linker.cmd file

ruijie yang said:

But when I try to print out the address of an initialized local static variable which defined in app's source file with printf("%x",&var);  it's not an address like 0x8xxxxxxx, but an address like 0x88xxxx which is a weird.

It is likely the variable is not in the .bss or .neardata sections.  See the part of the C6000 compiler manual titled Sections for a description of the section names used by the compiler, and what those section names contain.  Another way to see the sections used in ort.lib is with the object file display utility ofd6x.  It is described in the C6000 assembly tools manual.

Another point on a different, but related, topic ... You cannot split up .bss and .neardata like that.  Because those variables are all accessed at an offset from the DP (data page pointer) register, they have to be together.  Please read more about this in the C6000 compiler manual section titled Data Memory Models.

Thanks and regards,

-George

Thank you George,

I've read the manual you recommanded, but can not work out my problem.

1. First I want to make sure that my goal is reachable. If I want to put the .neardata in ort.lib to L2, and .neardata in app to DDR as I described in my first post, is it possible ?  Any way to do so?

2.  I want to show a weird problem that occurred, I tried to define a static variable as near(static near int var), but the ccs seems not recognize the near as keyword,the "near" is not red and bold in the edit window  and there's a question mark on the left edge of that line(keyword far is properly marked as a keyword). I'm  using CCS 5.5. Somehow I can't show the screenshot Sorry.

3.In my first post, I use 

SECTIONS

{

.localdata

{

"ort.lib"(.neardata)  

}    >   L2

}

to put the .neardata in ort.lib to L2.  Because I take a linker.cmd in ccs's omp demo "matrix" project . In this cmd file , it put the .fardata of some libraries to L2 while other objects's .fardata to MSMCRAM. Would you mind checking this linker.cmd and helping my understand it ?

4. I tried to modify my cmd file according to Example 7-9 and Example 7-25 in the manual, But it does not work in my expecting way. And when I build the app project, it has warning :

#Section ".localdata" requires a STATIC_BASE relative relocation,But is located at 0x80000000, which is probably out  of range of the STATIC_BASE.STATIC_BASE is located at 0x0087d000.Might be required to correct placement of  ".localdata" so it lies with 0x8000 of the STATIC_BASE.

#relocation from function "main" to symbol "var" overflowed;

var is a static int define in main().And it seems that the compiler has correct my setting in cmd by putting the .localdata to an address within 0x8000 from STATIC_BASE. Any way to stop to compiler to do so?

Thank you so much!! And hope you can help me out!

ruijie