Instruction manual
Description of the data path 
8.9.3  Loading a shading image out of the camera 
GPDATA_BUFFER is used to load a shading image out of the camera. Because the size of a 
shading image is larger than GPDATA_BUFFER, input must be handled in several steps: 
Figure 42: Uploding shading image to host 
MARLIN Technical Manual 
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