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To be able to use VIN with larger frame sizes CMA memory are needed for DMA. If this is not enabled trying to capture large frames can result in errors such as: rcar-vin e6ef0000.video: dma_alloc_coherent of size 8388608 failed A CMA area of 64MB are needed for v4l2-compliance to pass on all formats on the largest possible frame size of 2048x2048. Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Signed-off-by: Simon Horman <horms+renesas@verge.net.au> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.