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[10:33] <pinchartl> hverkuil: ping
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[15:36] <kilobyte_ch> dumb question, I have access to the v4l2_buffer in a driver module. Which element is the raw framebuffer itself? memory? If I try to clear some of the first byte the whole system crashes
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[15:44] <pinchartl> kilobyte_ch: in general you need to map the buffer first to have access to the data
[15:44] <pinchartl> see how it's done in the uvcvideo driver for instance
[15:45] <pinchartl> you'll need to get hold of the vb2_buffer first, v4l2_buffer won't let you access the memory
[15:46] <pinchartl> note that if the hardware device also accesses memory directly, you'll have to perform cache management to ensure that device and CPU memory accesses won't interfere badly with each other. it can become nasty
[16:03] <kilobyte_ch> oops, I looked wrong, I have access to the vb2_v4l2_buffer which contains memory. This is the correct one or is this also the wrong one? https://github.com/raspberrypi/linux/blob/rpi-5.10.y/drivers/media/platform/bcm2835/bcm2835-unicam.c#L857
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