how does the image signal processor run

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I know the cpu load code from memory and execute the code. The address of kernel code is above 0xc0000000 in 32 bit linux os. But I don’t know how the isp(image signal processor) run. Does isp also load code from memory above 0xc0000000 and execute the code? How does cpu communicate with isp ? The isp handle the raw image with arithmetic code. how does it load the arithmetic?

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