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Linux/AM5728: CMEM problem

Part Number: AM5728

Tool/software: Linux

Hello

I'm working at AM5728 and I use SDK 3.3, as some reason, I wan to use user-ptr to capture camera YUV data, when I use CMEM_alloc2 to alloc buffer and put ti to v4l2, I can get the right image, but I can only alloc just 3 1080P buffer, if I want more buffer, I got a NULL ptr. How can increase the CMEM buffer in AM5728 platform.