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Member "mesa-20.1.8/src/freedreno/drm-shim/README.md" (16 Sep 2020, 350 Bytes) of package /linux/misc/mesa-20.1.8.tar.xz:

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freedreno_noop backend

This implements the minimum of msm in order to make shader-db work. The submit ioctl is stubbed out to not execute anything.

Export MESA_LOADER_DRIVER_OVERRIDE=msm LD_PRELOAD=$prefix/lib/libfreedreno_noop_drm_shim.so.

By default, a630 is exposed. The chip can be selected an enviornment variable like `FD_GPU_ID=307"