Linker command file on KeyStone II DSPs

Cheng,

You need to look at the K2H data sheet for the memory map. For example, L2 and MSMC are larger, but if you only use a portion of it, it should be OK.

Program.sectMap["systemHeap"] = "MSMCSRAM"; =====> this kind of setting is inside the .cfg file. E.g, PDK \packages\ti\drv\hyplnk\example\memoryMappedExample\k2h\c66\bios\memoryMappedExample.cfg

Yes, malloc() allocates memory from heap.

Regards, Eric 

Hi Eric,

Thanks for your reply! 

From the packages\ti\drv\hyplnk\example\memoryMappedExample\k2h\c66\bios\memoryMappedExample.cfg, I found my .cfg file is as follows:

36 var System = xdc.useModule('xdc.runtime.System');
37 var hlink = xdc.useModule('ti.drv.hyplnk.Settings');
38 /* Use the CSL module and indicate that INTC library will be used. */
39 var devType = "k2h";
40 var Csl = xdc.useModule('ti.csl.Settings');
41 Csl.deviceType = devType;
42 Csl.useCSLIntcLib = true;
43
44 Program.sectMap[".text"] = "MSMCSRAM";
45 Program.sectMap[".const"] = "MSMCSRAM";
46 Program.sectMap[".init_array"] = "L2SRAM";
47 Program.sectMap[".csl_vect"] = "L2SRAM";
48 Program.stack = 1024*4 + 0x400;

There is actually no information to set the system heap. Should I add the following lines in the .cfg file?

BIOS.heapSize = 0x7D00;
BIOS.heapSection = "systemHeap";
//Program.sectMap["systemHeap"] = "L2SRAM";
//Program.sectMap["systemHeap"] = "DDR3";
Program.sectMap["systemHeap"] = "MSMCSRAM";

Do I need to rebuild the pdk package? Could you please show me how to build that?

The basic idea to set this to set the system heap location, e.g. MSMC, then I could allocate a memory using malloc() on MSMC and measure the time loading a data from MSMC. Is it a reasonable solution?

Or do you have other ways to do this, i.e. allocate a memory on L2, MSMC or DDR, no matter if the array static or dynamically allocated? Because rebuilding the pdk package again and again may not be a desirable solution.

Thanks

Cheng

Cheng,

This is just an exmaple how in the .cfg you can configure your memory placement. For your test, I don't recommend you re-build the PDK or use .cfg in a BIOS program. Rather, I believe you can just use your .cmd file for simplicity, you can put everything in L2, then heap is also allocated from L2; if you put everything in MSMC, then heap is also in MSMC. Look at the .map file generated, with a few trails you can find out.

Regards, Eric

Hi Eric,

That sounds doable. For the .map file, I remembered the CCS would generate that. Do you know how to get .map file without using ccs?

Thanks

Cheng