Problems when define a heap and generate sysmem section

Hi everyone,

I am working on c64xx and using ccs 3.3. In the code, I need to use the
malloc(), which means I need to define heap in memory. I tried to use the
DSP/BIOS config or the linker options (Project->Build
Options->Linker->Basic->Heap Size). The heap size is 0x10000. But when I
check the .map file, I found,

//.sysmem
* 0 00011000 00000000 UNINITIALIZED

My question is

1) why .sysmem section does not been generated?
2) why the length of the //.sysmem is zero?
3) Can I still use the heap based on current .map file?

Thanks for your help,
Xiaohan Chen

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