Memory Sections and location

The rules are explained in SPRU186V (Assembly Language Tools User Guide), Chapter 2 (Intro to Object Modules) and Chapter 7 (Linker).

I think the applicable rule is "biggest first", to reduce memory fragmentation.

I notice one of the TI examples (for IPC) has this in it, to reserve 0x8000 bytes at 0x0C3F8000 (the top of MSMC):

SECTIONS
{
   SharedRegion_0:  { . += 0x8000;} run > 0xc3f8000, type = NOLOAD
}

Then you can say something like this:

Program.sectMap[".windowData"] = "SharedRegion_0";

Hi brandy,

If you want to a section allocated in a fixed address, just modify the statement in your cfg:

Program.sectMap[".windowData"] = new Program.SectionSpec();

Program.sectMap[".windowData"] .loadAddress = 0x80000000;

 

Allen

Hello Allen,

thanks for the idea.  It didn't seem to change anything though.  windowData is still at 0x80020000.  Bummer - if only it could have been that simple :)

 

Hello Jonathan,

Thank you for the document reference and also for your idea, although I am not quite clear how to implement it.  I assume you mean to add the lines to the config file?  The SECTIONS directive seems to be used just in linker files and my project is an RTSC so I think my linker file gets created automagically by the .cfg file.

You are right about the largest going first - if I make .testData smaller then .windowData will move to 0x80000000.  While understanding the rules is good, I really don't want to get caught later because I forgot to check the memory map after each compile.

 

Thanks both of you, I am happy to test any more theories if you have them!

Brandy

Hi Brandy,

The method works well on my side, so could you please paste your cfg file here?

Allen

Hi Allen,

 

Sure.  Aside from the memory section it is the same config file that can be would in the SRIO_DIOLoopbackExample.

/*

 *  Copyright 2009 by Texas Instruments Incorporated.

 *

 *  All rights reserved. Property of Texas Instruments Incorporated.

 *  Restricted rights to use, duplicate or disclose this code are

 *  granted through contract.

 *

 */

 

/* THIS FILE WAS GENERATED BY ti.sysbios.genx */

 

/*

 *  ======== loopbackDioIsr.cfg ========

 *

 */

 

environment['xdc.cfg.check.fatal'] = 'false';

 

/* Load and use the various BIOS modules. */

var Memory  = xdc.useModule('xdc.runtime.Memory');

var BIOS    = xdc.useModule('ti.sysbios.BIOS');

var HWI     = xdc.useModule('ti.sysbios.family.c64p.Hwi');

var CPINTC  = xdc.useModule('ti.sysbios.family.c66.tci66xx.CpIntc');

var ECM     = xdc.useModule('ti.sysbios.family.c64p.EventCombiner');

var HeapMem = xdc.useModule('ti.sysbios.heaps.HeapMem');

var HeapBuf = xdc.useModule('ti.sysbios.heaps.HeapBuf');

var SEM     = xdc.useModule('ti.sysbios.knl.Semaphore');

var Task    = xdc.useModule('ti.sysbios.knl.Task');

var Idle    = xdc.useModule('ti.sysbios.knl.Idle');

var Log     = xdc.useModule('xdc.runtime.Log');

var Diags   = xdc.useModule('xdc.runtime.Diags');

 

/* Load and use the CSL, CPPI, QMSS and SRIO packages */

var cslSettings = xdc.useModule ('ti.csl.Settings');

var Cppi = xdc.loadPackage('ti.drv.cppi');

var Qmss = xdc.loadPackage('ti.drv.qmss');

var Srio = xdc.loadPackage('ti.drv.srio');

 

/* Load and use the System Package */

var System = xdc.useModule('xdc.runtime.System');

SysStd  = xdc.useModule('xdc.runtime.SysStd');

System.SupportProxy = SysStd;

 

/*

 * Enable Event Groups here and registering of ISR for specific GEM INTC is done

 * using EventCombiner_dispatchPlug() and Hwi_eventMap() APIs

 */

ECM.eventGroupHwiNum[0] = 7;

ECM.eventGroupHwiNum[1] = 8;

ECM.eventGroupHwiNum[2] = 9;

ECM.eventGroupHwiNum[3] = 10;

 

/* Load and use the IPC packages */

var Ipc          = xdc.useModule('ti.sdo.ipc.Ipc');

var Settings     = xdc.module('ti.sdo.ipc.family.Settings');

var ListMP       = xdc.useModule('ti.sdo.ipc.ListMP');

var GateMP       = xdc.useModule('ti.sdo.ipc.GateMP');

var SharedRegion = xdc.useModule('ti.sdo.ipc.SharedRegion');

var HeapMemMP    = xdc.useModule('ti.sdo.ipc.heaps.HeapMemMP');

var MultiProc    = xdc.useModule('ti.sdo.utils.MultiProc');

 

/* Create a default system heap using ti.bios.HeapMem. */

var heapMemParams1         = new HeapMem.Params;

heapMemParams1.size        = 32768;

heapMemParams1.sectionName = "systemHeap";

Program.global.heap0       = HeapMem.create(heapMemParams1);

 

/* This is the default memory heap. */

Memory.defaultHeapInstance = Program.global.heap0;

 

Program.sectMap["systemHeap"] = Program.platform.stackMemory;

 

/* Configure the shared memory heap for shared memory allocations required by the

 * CPPI and QMSS Libraries */

SharedRegion.translate = false;

 

var memmap = Program.cpu.memoryMap;

 

Startup = xdc.useModule('xdc.runtime.Startup');

Startup.firstFxns.$add('&myStartupFxn');

 

MultiProc.setConfig(null, ["CORE0", "CORE1", "CORE2", "CORE3"]);

 

/* Synchronize all processors (this will be done in Ipc_start) */

Ipc.procSync = Ipc.ProcSync_ALL;

 

/* To avoid wasting shared memory for Notify and MessageQ transports */

for (var i = 0; i < MultiProc.numProcessors; i++) {

    Ipc.setEntryMeta({

        remoteProcId: i,

        setupNotify: false,

        setupMessageQ: false,

    });

}

 

/* Create a shared memory */

SharedRegion.setEntryMeta(0,

    { base: 0x0C010000,

      len: 0x00100000,

      ownerProcId: 0,

      isValid: true,

      name: "sharemem",

    });

 

Program.sectMap[".srioSharedMem"] = new Program.SectionSpec();

Program.sectMap[".srioSharedMem"] = "MSMCSRAM";

 

Program.sectMap[".qmss"] = new Program.SectionSpec();

Program.sectMap[".qmss"] = "MSMCSRAM";

 

Program.sectMap[".cppi"] = new Program.SectionSpec();

Program.sectMap[".cppi"] = "MSMCSRAM";

 

Program.sectMap[".windowData"] = new Program.SectionSpec();

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

Program.sectMap[".windowData"].loadAddress = 0x80000000;

 

 

Program.sectMap[".testData"] = new Program.SectionSpec();

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

 

 Here is the memory map after I compile with this file.

MEMORY CONFIGURATION

 

         name            origin    length      used     unused   attr    fill

----------------------  --------  ---------  --------  --------  ----  --------

  L2SRAM                00800000   00080000  0002fffc  00050004  RW X

  MSMCSRAM              0c000000   00400000  001025fc  002fda04  RW X

  DDR3                  80000000   20000000  00300000  1fd00000  RWIX

 

 

SEGMENT ALLOCATION MAP

 

run origin  load origin   length   init length attrs members

----------  ----------- ---------- ----------- ----- -------

00800000    00800000    0001bc20   0001bc20    r-x

  00800000    00800000    0001bc20   0001bc20    r-x .text

0081bc20    0081bc20    00008000   00000000    rw-

  0081bc20    0081bc20    00008000   00000000    rw- systemHeap

00823c20    00823c20    000053e6   000053e6    r--

  00823c20    00823c20    000053e6   000053e6    r-- .const

00829010    00829010    00002198   00000000    rw-

  00829010    00829010    00002198   00000000    rw- .far.1

0082b1b0    0082b1b0    00000428   00000000    rw-

  0082b1b0    0082b1b0    00000428   00000000    rw- .far.2

0082b5e0    0082b5e0    00000014   00000000    rw-

  0082b5e0    0082b5e0    00000014   00000000    rw- .far.3

0082b600    0082b600    00001f38   00001f38    rw-

  0082b600    0082b600    00001f38   00001f38    rw- .fardata.1

0082d540    0082d540    00000134   00000134    rw-

  0082d540    0082d540    00000134   00000134    rw- .fardata.2

0082d680    0082d680    00000128   00000128    rw-

  0082d680    0082d680    00000128   00000128    rw- .fardata.3

0082d7b0    0082d7b0    00000014   00000014    rw-

  0082d7b0    0082d7b0    00000014   00000014    rw- .fardata.4

0082d7d0    0082d7d0    00000014   00000014    rw-

  0082d7d0    0082d7d0    00000014   00000014    rw- .fardata.5

0082d7f0    0082d7f0    00000068   00000068    rw-

  0082d7f0    0082d7f0    00000068   00000068    rw- .fardata.6

0082d860    0082d860    00000008   00000008    rw-

  0082d860    0082d860    00000008   00000008    rw- .fardata.7

0082d870    0082d870    00000004   00000004    rw-

  0082d870    0082d870    00000004   00000004    rw- .fardata.8

0082d880    0082d880    00000004   00000004    rw-

  0082d880    0082d880    00000004   00000004    rw- .fardata.9

0082d890    0082d890    00000004   00000004    rw-

  0082d890    0082d890    00000004   00000004    rw- .fardata.10

0082d8a0    0082d8a0    00000004   00000004    rw-

  0082d8a0    0082d8a0    00000004   00000004    rw- .fardata.11

0082d8b0    0082d8b0    00000004   00000004    rw-

  0082d8b0    0082d8b0    00000004   00000004    rw- .fardata.12

0082d8c0    0082d8c0    00000004   00000004    rw-

  0082d8c0    0082d8c0    00000004   00000004    rw- .fardata.13

0082d8d0    0082d8d0    00000004   00000004    rw-

  0082d8d0    0082d8d0    00000004   00000004    rw- .fardata.14

0082d8e0    0082d8e0    00000002   00000002    rw-

  0082d8e0    0082d8e0    00000002   00000002    rw- .fardata.15

0082d8e8    0082d8e8    0000112c   00000000    rw-

  0082d8e8    0082d8e8    00001000   00000000    rw- .stack

  0082e8e8    0082e8e8    00000120   00000000    rw- .cio

  0082ea08    0082ea08    0000000c   00000000    rw- .bss

0082ea14    0082ea14    00000025   00000025    rw-

  0082ea14    0082ea14    00000025   00000025    rw- .neardata

0082ea3c    0082ea3c    00000048   00000048    r--

  0082ea3c    0082ea3c    00000048   00000048    r-- .rodata

0082ea84    0082ea84    00000070   00000070    r--

  0082ea84    0082ea84    00000070   00000070    r-- .switch

0082ec00    0082ec00    000015cc   000015cc    r-x

  0082ec00    0082ec00    00000200   00000200    r-x .vecs

  0082ee00    0082ee00    000013cc   000013cc    r-- .cinit

0c000000    0c000000    00002378   00000000    rw-

  0c000000    0c000000    00002378   00000000    rw- .qmss

0c002380    0c002380    00000104   00000104    rw-

  0c002380    0c002380    00000104   00000104    rw- .srioSharedMem

0c002500    0c002500    00000180   00000000    rw-

  0c002500    0c002500    00000180   00000000    rw- .cppi

80000000    80000000    00300000   00000000    rw-

  80000000    80000000    00180000   00000000    rw- .testData

  80180000    80180000    00180000   00000000    rw- .windowData

 

Thank for your help!

Brandy