Problem with Error: memory map prevetned reading 0x00000000

You are getting that message as the debuggers memory map prevents it from accessing that location in memory.  Basically it has been told by the target configuration that there is no memory there or that it is not readable.

When I look at the memory map for my OMAPL138, which has the same DSP on it as C6748 I see that there is no memory from 0x0 to 0x6FFFFF.  When in your debug session if you go to Tools -> Memory Map it will open a window that shows the memory map.  It should show the same for you.

So now the question is why is your array going there?  When I look at the linker command file for C6748 it does not define any memory at 0x00000000.  Do you have a linker command file (.cmd) in your project?  It is essential to have one as this defines to the linker where valid memory is.  When you create a new project in CCS it should add the appropriate one for you.  If yours is missing the file is located in: <your install dir>\ccsv6\ccs_base\c6000\include

Regards,

John

I am using the cmd file of the gpio example which is the Starware.

This is the file:

// ============================================================================
// Linker Command File for Linking c674 DSP Programs
//
// These linker options are for command line linking only. For IDE linking,
// you should set your linker options in Project Properties.
// -c Link Using C Conventions
// -stack 0x1000 Software Stack Size
// -heap 0x1000 Heap Area Size
// ===========================================================================
-c
-stack 0x1000
-heap 0x1000

// ============================================================================
// Specify the System Memory Map
// ============================================================================
MEMORY
{
L1P: o = 0x11E00000 l = 0x00008000
L1D: o = 0x11F00000 l = 0x00008000
L2: o = 0x11800000 l = 0x00040000
DDR2: o = 0xC0000000 l = 0x08000000
}

// ============================================================================
// Specify the Sections Allocation into Memory
// ============================================================================
SECTIONS
{
.cinit > DDR2 // Initialization Tables
.pinit > DDR2 // Constructor Tables
.init_array > DDR2 //
.binit > DDR2 // Boot Tables
.const > DDR2 // Constant Data
.switch > DDR2 // Jump Tables
.text > DDR2 // Executable Code
.text:_c_int00: align=1024 > DDR2 // Entrypoint

GROUP (NEARDP_DATA) // group near data
{
.neardata
.rodata
.bss // note: removed fill = 0
} > DDR2
.far: fill = 0x0, load > DDR2 // Far Global & Static Variables
.fardata > DDR2 // Far RW Data
.stack > DDR2 // Software System Stack
.sysmem > DDR2 // Dynamic Memory Allocation Area

.cio > DDR2 // C I/O Buffer
.vecs > DDR2 // Interrupt Vectors
}

Any idea?? Why is my array going to 0x00000000?

Thank you

Kind Regards

Could you look at the structure in the memory view and see which address the pointer to the array is pointing to?

I am likely going to have to move this one into the Compiler forum.

This is the information:

The struct has a valid adress but the array goes to 0x00000000.

Any idea??

Thank you

Kind Regards

Hello

I think I have found the problem.

If I try to reserve an array with less elements, it works.

My array has 307200 elements, it does not work. But if I try with 1000 elements array, it works.

Can I change something to work with a 307200 elements array?

Thank you

Kind Regards