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E3815 GTT memory allocation

Hello!

I'm trying to figure out the order of initialization of the E3815 graphics. I cannot understand whether to allocate memory for Graphics Translation Table. The documentation (# IHD-OS-VLV-Vol5-04.14, page 19) says: "The base address (MM offset) of the GTT and the PPGTT are programmed via the PGTBL_CTL and PGTBL_CTL2 MI registers, respectively." But I can not find the description of the register PGTBL_CTL in the E3800 Datasheet. Also, I looked at the Linux driver (i915) source code and it seems like it doesn't allocate memory for GTT. Hence the question: Do I have to allocate memory for GTT, and if so, how to do it correctly?

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Moderator
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Hello AlexMamonov ,

Thank you for contacting the Intel Embedded Community.

The information that may help you is stated in the https://01.org/sites/default/files/documentation/intel_os_gfx_prm_vol2_-_cmd_ref_registers_0.pdf Intel® Open Source HD Graphics Programmers' Reference Manual (PRM) Volume 2, Part 3: Command Reference - Registers For the 2014 Intel Atom™ Processors, Celeron™ Processors, and Pentium™ Processors based on the "BayTrail" Platform (ValleyView graphics) document # IHD-OS-VLV-Vol2pt3-04.14.

It is important to let you know that the Intel Open Source Graphics Programmer's Reference Manual (PRM) For The 2014 Intel® Atom™ Processors, Celeron™ Processors, and Pentium™ Processors based on the Bay Trail Platform can be found at the https://01.org/linuxgraphics/documentation/driver-documentation-prms/2014-intel-processors-based-bay... 2014 Intel Processors based on the Bay Trail Platform website.

We hope that this information may help you.

Best Regards,

Carlos_A.

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Novice
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Hello, Carlos.

I looked through document that you mentioned, but I didnt find anything on PGTBL_CTL register or on allocating memory for GTT. Please, could you elaborate in what part of the document should I seek?

Thanks in advance, Alex.

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Moderator
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Hello, AlexMamonov :

Thanks for your reply.

We suggest you address your consultations to the https://01.org/linuxgraphics/forum/graphics-power-users Intel(R) Graphics for Linux* Forum or its https://lists.freedesktop.org/mailman/listinfo/intel-gfx Mailing list.

We hope that this information may help you.

Best regards,

Carlos_A.

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