Task stack segment in SDRAM fails

Hi,

I'm using DSP/BIOS 5.42.01.09 with XDCTools 3.24.5.48 in CCS6 under Linux. I work with C6745 DSP at custom board with 8Mb SDRAM.

I have some problems with placing task stack into SDRAM.

1. BIOS goes to restart when try to execute task with stack in SDRAM
2. Tasks with different stack location has different stackPeak value in ROV
3. Task stack located in SDRAM seems to be uninitialized at main() entry point (filled with 0xBEBEBEBE)

Could anyone help me?

Below I list minimal working example to illustrate my problem:

I use a bit modified DSP/BIOS tsk example from evmC6747 package (RED marks changes since original example)

SDRAM configuration performed by GEL, before application starts

TCF

utils.loadPlatform("ti.platforms.evm6747");

bios.enableRealTimeAnalysis(prog);
bios.enableMemoryHeaps(prog);
bios.enableRtdx(prog);
bios.enableTskManager(prog);

bios.IRAM.createHeap      = true;
bios.IRAM.enableHeapLabel = true;
bios.IRAM["heapLabel"]    = prog.extern("SEG0");
bios.IRAM.heapSize        = 0x2000;
bios.MEM.BIOSOBJSEG = prog.get("IRAM");
bios.MEM.MALLOCSEG = prog.get("IRAM");

bios.GBL.C64PLUSCONFIGURE = 0;
bios.GBL.C64PLUSMAR128to159 = 0x0000ffff;

bios.CLK.TIMERSELECT = "Timer 0";      /* Select Timer 0 to drive BIOS CLK */
bios.CLK.RESETTIMER = true;          /* Take the selected timer our of reset */

bios.LOG_system.bufLen = 512;

var trace = bios.LOG.create("trace");
trace.bufLen = 1024;
trace.logType = "circular";

var task0 = bios.TSK.create("task0");
task0.priority = 1;
task0["fxn"] = prog.extern("task");
task0.arg0 = 0;

var task1 = bios.TSK.create("task1");
task1.priority = 1;
task1["fxn"] = prog.extern("task");
task1.arg0 = 1;
task1.stackMemSeg = prog.get("SDRAM");

var task2 = bios.TSK.create("task2");
task2.priority = 1;
task2["fxn"] = prog.extern("task");
task2.arg0 = 2;
// !GRAPHICAL_CONFIG_TOOL_SCRIPT_INSERT_POINT!

if (config.hasReportedError == false) {
    prog.gen();
}

Task view of ROV:

Memory dumps at main() entry point

task0$stkptr
BEBEBEBE    00000000    00000000    11803320    00000000    11802AF8    00000000    00000000    00000000    00000000    00000000
00000000    00000000    00000000    00000000    00000000    00000000    00000000    00000000    00000000    00000000    1180A5A4
11802C60    00000000    00000000    BEBEBEBE

task1$stkptr
BEBEBEBE    BEBEBEBE    BEBEBEBE    BEBEBEBE    BEBEBEBE    BEBEBEBE    BEBEBEBE    BEBEBEBE    BEBEBEBE    BEBEBEBE    BEBEBEBE
BEBEBEBE    BEBEBEBE    BEBEBEBE    BEBEBEBE    BEBEBEBE    BEBEBEBE    BEBEBEBE    BEBEBEBE    BEBEBEBE    BEBEBEBE    BEBEBEBE
BEBEBEBE    BEBEBEBE    BEBEBEBE    BEBEBEBE

Memory dumps at BIOS_init() entry

task0$stkptr
BEBEBEBE    00000000    00000000    11803320    00000000    11802AF8    00000000    00000000    00000000    00000000    00000000
00000000    00000000    00000000    00000000    00000000    00000000    00000000    00000000    00000000    00000000    1180A5A4
11802C60    00000000    00000000    BEBEBEBE

task1$stkptr
BEBEBEBE    00000000    00000000    11803320    00000000    11802AF8    00000000    00000000    00000000    00000000    00000000
00000000    00000000    00000000    00000000    00000001    00000000    00000000    00000000    00000000    00000000    1180A5A4
11802C60    00000000    00000000    BEBEBEBE