Limiting program RAM addresses

[sarraciro]

Assuming that you want run a function in specific RAM sector....
You  should modify the linker script.... Adding an output section in
which the input sections work only in the memory region needed.
.TestFunction 0x08055554 :
    {
	  *(prgm_mem)
    } >RAM

I think also that there are several way to reach this goal. Another way,
probably, could be declare in the linker script a dedicated memory
region in which origin and size are known.
In this case you have to use MEMORY command like this
MEMORY
{
  FLASH (rx)                  : ORIGIN = 0x08000000, LENGTH = 1024K
  RAM (xrw)                   : ORIGIN = 0x20000000, LENGTH = 192K
 MPrivateArea(xrw)     : ORIGIN = valid RAM address, LENGTH = size in
byte (or suffix use)
  MEMORY_B1 (rx)     : ORIGIN = 0x60000000, LENGTH = 0K
}
 and the output section for the new memory layout:
TestFunction 0x08055554 :
    {
	  *(prgm_mem)
    } >mprivatearea

Note that access directly to memory resource have its rules and the
interaction between the linker script and sources (.s or .C or C++ <-
Bad idea imho) must be defined with clear names space, attribute and
variables... 
  
I hope this notes will usefull for your considerations.

Regards

--
RC
Il giorno ven, 29/11/2013 alle 09.44 +0100, Sebastian Huber ha scritto:
> On 2013-11-29 09:39, Mohammed Khoory wrote:
> > I've registered a ramdisk driver to use the range between
> > 0x40200000 - 0x40800000.
> 
> How did you do this?
>