Hi Marek and Laurent, I am working on v4l2 drivers for blackfin which is a no mmu soc. I found videobuf allocate memory in mmap not reqbuf, so I turn to videobuf2. But __setup_offsets() use plane offset to fill m.offset, which is always 0 for single-planar buffer. So pgoff in get_unmapped_area callback equals 0. I only found uvc handled get_unmapped_area for no mmu system, but it manages buffers itself. I really want videobuf2 to manage buffers. Please give me some advice.
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