Etnaviv: An Open-Source Driver For Vivante GPUs
Written by Michael Larabel in Free Software on 11 January 2013 at 12:47 PM EST. 1 Comment
Etnaviv is a new open-source project for building a user-space graphics driver for controlling the Vivante GPUs found in some ARM SoCs. The ultimate goal is to create a new Mesa/Gallium3D driver for this graphics core.

At the moment the Etnaviv driver is particularly seeking to support the Vivante GCxxx series of embedded graphics processors. The 3D-capable Vivante GPUs include the GC400, GC500, GC600, GC800, GC1000, GC2000, and GC4000 products. These graphics cores support OpenGL ES 2.0, OpenVG 1.1, EGL 1.4, DirectX 11, and OpenGL 2.1/3.0.

The Vivante GPUs have been found in many ARM SoCs from the low-cost "Chinese tablets." Among the popular devices bearing Vivante graphics include the Google TV, OLPC, CuBox, many Rockchip 2918 tablets, and devices shipping the Freescale i.MX 6 series. Primary development of this driver is being done by Wladimir J. van der Laan and he's using an Android tablet with a Rockchip RK2918 bearing a GC800 GPU.

The Etnaviv driver ("Vivante" spelled in reverse) is currently in an experimental state. Like Lima, Freedreno, and various other ARM GPU drivers, Etnaviv is developed through reverse-engineering of the Linux driver's binary blob. The ultimate goal for this open-source ARM Vivante GPU driver is to create a Mesa/Gallium3D driver.

At present there's no plans on writing a new open-source kernel driver for the Vivante hardware. Vivante previously put out their Linux kernel component under the GPL.

Within the project's code repository is known information about the render state and registers, ISA vertex/fragment shader documentation, a basic disassembler for shader instructions, command stream format information, interception paths for the GPU command stream, a command stream dumper, replay test, and other components needed for reverse-engineering the Vivante GC graphics and for writing this new user-space 3D driver.

The Etnaviv "Etna_viv" driver project is currently being housed and developed on GitHub.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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