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Native Intel graphics: Difference between revisions
→Generation 4 GMA desktop chips (aka Intel G45)
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=Generation 4 GMA desktop chips (aka Intel G45)=
The G45 is a PCI-Express based graphics chip that was introduced by Intel in 2008.
==Architecture overview==
G45 chips appear as devices on the PCI bus. They are identified a vendor ID of 0x8086 and a model-specific device ID. The PCI configuration space is used to access two BARs: The first BAR points to a MMIO region that contains all registers of the card. The second BAR allows access to the graphics memory.
The chip supports two independent graphics pipelines. Each pipeline is made of the following:
* A DPLL (digital phase-locked loop) that generates the pixel clock.
* A display pipe that is responsible for programming the display timings.
* A primary plane that supplies primary framebuffer to the display pipe and secondary planes. Those secondary planes are mostly used to implement hardware mouse cursors.
Both pipelines share a set of connectors that are used to attach monitors to the card.
==Mode setting==
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