Compiler/TMS320C6713: Loading program sections in memory, linker script.

In TI documentation, what you term a "linker script" is called a "linker command file".  Neither term is better than the other.  They are simply different phrases for the same thing.

aimal khan said:

How processor gonna execute this program

That depends on the details of what occurs when power is turned on.  It is typical for the system to start by vectoring to a particular interrupt (often called the reset vector).  It is your responsibility to attend to such details.  This includes getting the system to execute the startup code.  

aimal khan said:

if it load full program in SRAM, what about the gap b/w .text section and .data section

Provided your code doesn't have some fault that causes execution to somehow run away, those memory locations go untouched.  

aimal khan said:

isn't it sort of  fragmentation problem??

Not one that occurs in practice.  In practice, the MEMORY directive in the linker command file contains an accurate map of system memory.  Thus the holes that do occur tend to be small, or due to a program that is much smaller than available memory.

aimal khan said:

what about the output object file, how these non contiguous sections be placed inside object file???

The location of the raw data of a section within an object file is determined by the object file format.  I recommend you perform an internet search on the terms in italics.

Here are some wiki articles that are likely to be useful.

• A Brief History of TI Object File Formats
• Linker Command File Primer

Thanks and regards,

-George