PMEM device

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Hi ,
       I  have an use-case where i need to reserve high volume memory buffer  - (Video buffer) and  it has to be shared between user-space and kernel space. Please help me how to we achieve this using "/dev/pmem" device ? 

When registering platform device  - PMEM device, we are supplying base address .And this memory is ioremap-ed  under  pmem driver . Please let me know how this memory is reserved ?  Is it necessary to boot linux with param MEM , to define less memory ?

--
With Regards,
ShankarGanesh K .


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