Intel(r) G45 Programmer's Reference Manual

Keith Packard keithp at
Wed Apr 15 16:18:34 PDT 2009

Digital Enterprise Group (DEG) & Software Solutions Group (SSG)
        Angela Gill (Visual Computing Group), and Keith Packard (Open
Source Technology Center)
        April 15, 2009
        Intel® G45 Programmer’s Reference Manual
        We are pleased to announce that the Intel® G45 Express Chipset
[Graphics and Memory Controller Hub-GMCH] Programmer’s Reference Manual
(PRM) is now publicly available!  The PRM resides on the Linux Graphics
website ( as well as the Visual
Computing Training website (
        The PRM describes the architectural behavior and programming
environment of the chipset and graphics devices.  The GMCH’s Graphics
Controller (GC) contains an extensive set of registers and instructions
for configuration, 2D, 3D, and Video systems. The PRM describes the
register, instruction, and memory interfaces and the device behaviors as
controlled and observed through those interfaces.  The PRM also
describes the registers and instructions and provides detailed bit/field
descriptions.  This information is critical to the development and
maintenance of Intel graphics drivers for this hardware.
        Many thanks to the Graphics Engineering team and the Open Source
Technology Center for their work in identifying the appropriate material
to include in the PRM.  We would like to recognize Patricia Langstraat
for her technical writing prowess as well as Eric Anholt for his help in
reviewing the draft PRM material.  Others on Jeff Bock’s team were
invaluable in their efforts to ensure this PRM contains useful
information for the open source community.
keith.packard at
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