Defining section over multiple memory blocks

Hello,

I work with a F28035.

I wonder if I can safely define a memory allocation over multiple physical memories.

I mean that in my memory mapping file I have:

PAGE 1 : 
	BOOT_RSVD   : origin = 0x000000, length = 0x000050     /* Part of M0, BOOT rom will use this for stack */
	RAM_M0PART2_M1 : origin = 0x000050, length = 0x0007B0

Memory allocation RAM_M0PART2_M1 may be used for any section depending on my application.
I wonder what would happen if the a variable is defined a the boundary of both memories.

So my questions :

 - Can I used RAM_M0PART2_M1 without any special care for all kinds of sections?

 - If not, which sections need special care?

 - Where can I find a document explaining this behavior?

Thank you!