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Why my heapMem cannot place on DDR3 on 6678?

steve zhang
Expert 1690 points

Other Parts Discussed in Thread: SYSBIOS

Hi,all:

My cfg like below:

var HeapMem = xdc.useModule('ti.sysbios.heaps.HeapMem');
var heapMemParams = new HeapMem.Params();
heapMemParams.size = 1000000;//intHeapSize;
heapMemParams.sectionName = ".output_buffer";
Program.global.INTMEM_HEAP = HeapMem.create(heapMemParams);
Memory.defaultHeapInstance = Program.global.INTMEM_HEAP;

Program.sectMap[".output_buffer"] = "DDR3";

As I understand,ti.sysbios.heaps.HeapMem should be placed on DDR3 and its address should

be beyond the 0x8000 0000.But in fact when I see the ROV it is all different.

From that figure,The HeapMem start from 0x0080bcd0 which should be in the range of L2SRAM not DDR3.

Why ? Thanks!

  • 0
    Mastermind 6240 points

    Hi,

    Actually it's placed in DDR3 (buf is 0x80000000), that one I think is the address that contains the starting address of the heap.

    Regards

    J.

  • 0 in reply to Johannes
    Expert 1690 points

    Johannes said:

    Hi,

    Actually it's placed in DDR3 (buf is 0x80000000), that one I think is the address that contains the starting address of the heap.

    Regards

    J.

    Hi Johannes:

    I am sorry for replying lately. I still don't understand what you mean and I don't think you

    answer my question.

    1.

    I have placed my heapMem into DDR3.why address of HeapMem in ROV is 0x0080bcd0 which

    is in L2SRAM not DDR3? I cannot understand this point.

    2.

    Why address of HeapMem is 0x0080bcd0 and buf of HeapMem is 0x80000000 in ROV?

    Why one is in L2SRAM and the other is in DDR3? 

    As I understand,Both address and buf of HeapMem all should be in DDR3.

  • 0 in reply to steve zhang
    Mastermind 6240 points

    Hi,

    The heap is in DDR3, however the start address of the Heap is stored in your Data Memory, in this case is L2SRAM. If you change the Data Memory to MSMCSRAM in your platform, you would see the address of the Heap in MSMCSRAM.

    Regards

    J