AM5726: Allocating memory from DSP

Harshil Soni

Part Number: AM5726

HI ,

we want to run some operation on DSP in AM57xx evm using OPENCL

so there is a DSP algorithm code in which it want to allocate memory on dsp side using MEM_alloc

we compile that DSP side code and create it's static library.
after this we creates wrapper in .cl file to call that function from arm side.

but when we compile .cl file with that DSP library to create .out file it shows undefined reference to MEM_alloc

so at this condition if it is possible to use MEM_alloc From dsp side then how can we use it.
or is there any other way (in opencl) to allocate memory at dsp side for alternative of MEM_alloc.

thanx.

over 8 years ago

0 Biser Gatchev-XID over 8 years ago

TI__Guru**** 393215 points

The software team have been notified. They will respond here.

0 Ajay Jayaraj over 8 years ago

TI__Expert 3350 points

Harshil,

The TI OpenCL User Guide has a section on memory allocation from OpenCL C kernels or C code called from OpenCL C kernels at: downloads.ti.com/.../dsp-malloc-extension.html

Hope this helps,
Ajay

0 Harshil Soni over 8 years ago in reply to Ajay Jayaraj

Prodigy 50 points

hi Ajay,

according to your answer we have to call that OPENCL c kernel to allocate memory from ARM side Host code,

but we want to allocate memory in DSP side when it wants ( inside any DSP side function).

so is there any provision to allocate memory on DSP side.

Thanx ,

0 Ajay Jayaraj over 8 years ago in reply to Harshil Soni

TI__Expert 3350 points

Harshil,

The recommended approach would be to call an OpenCL kernel with a buffer and initialize a heap using that buffer as backing memory. This is done using the __heap_init_ functions. Once the heap is initialized, C code on the DSP called from OpenCL kernels can allocate memory using the __malloc_ functions. The heap initialization kernel is called once to set up the heap on the DSP. After setup, kernels can use the __malloc_* function as long as the OpenCL buffer used for the heap is available.

You'll have to replace the MEM_alloc functions in your DSP code with __malloc_* functions.

Ajay

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AM5726: Allocating memory from DSP