Accessing external RAM for heap allocation.

Reply from ARM technical support.

Normally you can use the external ram as the internal ram if you can make sure the external ram is initialized before you use it.
Make sure the initialization code use just internal ram and locate at early stage of your program.

My reply:

I am initializing external ram at driver level. I can use external ram only for my global and static variables by specifying per cpp file properties. select external ram option.

I am using internal ram for stack and heap. I believe I can only use either internal or external ram for heap and stack not both at the same time.
My question is how and where I can specify per C++ class with new and delete operator overload and using memory pool to use external ram with its address.

Reply from ARM technical support.

My suggestion is a simple solution for your case.
Just define your heap address to the external ram, and initialize the external memory at the beginning of your program.
Then you can use new and delete freely.
You could also define all the global and static variables in the external ram(RW ZI to the scatter file), if you are not using them before complete the initialization of the external ram.

My reply:
I known that just define your heap address to the external ram, and initialize the external memory at the beginning of your program.
However I want to use both internal and external ram for heap. Is there alternative method?

any suggestions?

Thanks,
Naeem

Reply from ARM technical support.

Normally you can use the external ram as the internal ram if you can make sure the external ram is initialized before you use it.
Make sure the initialization code use just internal ram and locate at early stage of your program.

My reply:

I am initializing external ram at driver level. I can use external ram only for my global and static variables by specifying per cpp file properties. select external ram option.

I am using internal ram for stack and heap. I believe I can only use either internal or external ram for heap and stack not both at the same time.
My question is how and where I can specify per C++ class with new and delete operator overload and using memory pool to use external ram with its address.

Reply from ARM technical support.

My suggestion is a simple solution for your case.
Just define your heap address to the external ram, and initialize the external memory at the beginning of your program.
Then you can use new and delete freely.
You could also define all the global and static variables in the external ram(RW ZI to the scatter file), if you are not using them before complete the initialization of the external ram.

My reply:
I known that just define your heap address to the external ram, and initialize the external memory at the beginning of your program.
However I want to use both internal and external ram for heap. Is there alternative method?

any suggestions?

Thanks,
Naeem