heap should be placed in external SDRAM

Destiniy

Intellectual 305 points

Other Parts Discussed in Thread: SYSBIOS

Hi,

I defined a memory section SDRAM in the platform (0xC7000000) of a omap l137. I want to use this section for the heap.

I added the BIOS module and Programm is from default added. I set the following configs

BIOS.heapSize = 32768;
Program.sectMap[".sysmem"] = "SDRAM";

like here http://e2e.ti.com/support/embedded/bios/f/355/p/103991/367987.aspx#367987

This compiles succesful but if I do maolloc in my application in different threads I never get an address which beginns with 0xc7.

How can I do this?

regards

over 12 years ago

0 ToddMullanix over 12 years ago

TI__Guru* 96960 points

Hi,

What version of SYS/BIOS are you using? Can you attach your .cfg file? I want to see how you are using ".sysmem".

Todd

0 Destiniy over 12 years ago in reply to ToddMullanix

Intellectual 305 points

version 6.35.0.20 and the hole file .cfg for my omap l137 dsp is below

var BIOS = xdc.useModule('ti.sysbios.BIOS');
BIOS.libType = BIOS.LibType_Custom;
BIOS.assertsEnabled = false;
BIOS.logsEnabled = false;
BIOS.swiEnabled = false;
BIOS.clockEnabled = false;

BIOS.heapSize = 32768;
Program.sectMap[".sysmem"] = "SDRAM";

The problem is that the heap isn't in SDRAM malloc() gives no SDRAM address back.

regards

0 Destiniy over 12 years ago in reply to Destiniy

Intellectual 305 points

any idia why this with sysbios 6.35.0.20 not work?

Program.sectMap[".sysmem"] = "SDRAM";

0 Destiniy over 12 years ago in reply to Destiniy

Intellectual 305 points

Hi,

if I use the modules Memory and Heapmem it works now

Program.sectMap[".systemHeap"] = "SDRAM";
var heapMem0Params = new HeapMem.Params();
heapMem0Params.instance.name = "heapMem0";
heapMem0Params.sectionName = ".systemHeap";
heapMem0Params.size = 8192;
Program.global.heapMem0 = HeapMem.create(heapMem0Params);
Memory.defaultHeapInstance = Program.global.heapMem0;

But thequestion is still there wy the .sysmem section isn't set to external RAM

Program.sectMap[".sysmem"] = "SDRAM";

It would be easier. Maybe anybody knows about the problem or is sysmem renamed to another section name?

regards

0 ToddMullanix over 12 years ago in reply to Destiniy

TI__Guru* 96960 points

SYS/BIOS does not create or use a .sysmem section.

0 Destiniy over 12 years ago in reply to ToddMullanix

Intellectual 305 points

On which section is the default heap in sysbios?

0 ToddMullanix over 12 years ago in reply to Destiniy

TI__Guru* 96960 points

Depends on the target. For omapl137 it is ".far". You can control the section by configuring the desired section. For example, I placed the heap in ".heapSection" below.

Todd

Processors

Processors forum

heap should be placed in external SDRAM