freedreno: move legacy kgsl related README
Signed-off-by: Rob Clark <robclark@freedesktop.org>main
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This is a historical discription of what is now the kgsl backend
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in libdrm freedreno (before the upstream drm/msm driver). Note
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that the kgsl backend requires the "kgsl-drm" shim driver, which
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usually is in disrepair (QCOM does not build it for android), and
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due to random differences between different downstream android
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kernel branches it may or may not work. So YMMV.
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Original README:
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----------------
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Note that current msm kernel driver is a bit strange. It provides a
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DRM interface for GEM, which is basically sufficient to have DRI2
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working. But it does not provide KMS. And interface to 2d and 3d
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