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cc95f18973
Since commit 17fec8a0 [1] drm/i915: Use Graphics Base of Stolen Memory on all gen3+ present in the Linux kernel since version 3.12, 3D does not work anymore [2]. Comparing the graphics registers, in this case that means output of `intel_reg_dumper`, the vendor Video BIOS is setting the register PGTBL_CTL/PGETBL_CTL, only documented in the i965 datasheet [3], to `0x3ffc0001` on a system with 1 GB of RAM, while native graphics init sets it to `0x3f800001`. Currently native graphis init sets the GTT right above the base address of stolen memory. The Video BIOS sets it below the top of memory. The Linux Intel driver expects it to be below top of memory, so do it this way, by setting the address to TOM minus the size of the GTT, which is hardcoded to 256 KiB. As `PGETBL_CTL` is zero by default, reading its value in the beginning is not necessary and is only confusing. Make it clear that the code calculates the value. There is still a PTE error reported during boot, but 3D works with Linux 3.12+ and no user visible problems are shown. [1] https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=17fec8a08698bcab98788e1e89f5b8e7502ababd [2] https://bugs.freedesktop.org/show_bug.cgi?id=79038 [3] https://01.org/linuxgraphics/sites/default/files/documentation/965_g35_vol_1_graphics_core_0.pdf Intel ® 965 Express Chipset Family and Intel ® G35 Express Chipset Graphics Controller Programmer’s Reference Manual Volume 1: Graphics Core Revision 1.0a Change-Id: I0a5b04c2c5300f5056cb48075aa5804984bc9948 Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net> Signed-off-by: Francis Rowe <info@gluglug.org.uk> Reviewed-on: http://review.coreboot.org/5927 Tested-by: build bot (Jenkins) Reviewed-by: Vladimir Serbinenko <phcoder@gmail.com> |
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| documentation | ||
| payloads | ||
| src | ||
| util | ||
| .gitignore | ||
| .gitmodules | ||
| .gitreview | ||
| COPYING | ||
| Makefile | ||
| Makefile.inc | ||
| README | ||
| toolchain.inc | ||
------------------------------------------------------------------------------- coreboot README ------------------------------------------------------------------------------- coreboot is a Free Software project aimed at replacing the proprietary BIOS (firmware) found in most computers. coreboot performs a little bit of hardware initialization and then executes additional boot logic, called a payload. With the separation of hardware initialization and later boot logic, coreboot can scale from specialized applications that run directly firmware, run operating systems in flash, load custom bootloaders, or implement firmware standards, like PC BIOS services or UEFI. This allows for systems to only include the features necessary in the target application, reducing the amount of code and flash space required. coreboot was formerly known as LinuxBIOS. Payloads -------- After the basic initialization of the hardware has been performed, any desired "payload" can be started by coreboot. See http://www.coreboot.org/Payloads for a list of supported payloads. Supported Hardware ------------------ coreboot supports a wide range of chipsets, devices, and mainboards. For details please consult: * http://www.coreboot.org/Supported_Motherboards * http://www.coreboot.org/Supported_Chipsets_and_Devices Build Requirements ------------------ * gcc / g++ * make Optional: * doxygen (for generating/viewing documentation) * iasl (for targets with ACPI support) * gdb (for better debugging facilities on some targets) * ncurses (for 'make menuconfig') * flex and bison (for regenerating parsers) Building coreboot ----------------- Please consult http://www.coreboot.org/Build_HOWTO for details. Testing coreboot Without Modifying Your Hardware ------------------------------------------------ If you want to test coreboot without any risks before you really decide to use it on your hardware, you can use the QEMU system emulator to run coreboot virtually in QEMU. Please see http://www.coreboot.org/QEMU for details. Website and Mailing List ------------------------ Further details on the project, a FAQ, many HOWTOs, news, development guidelines and more can be found on the coreboot website: http://www.coreboot.org You can contact us directly on the coreboot mailing list: http://www.coreboot.org/Mailinglist Copyright and License --------------------- The copyright on coreboot is owned by quite a large number of individual developers and companies. Please check the individual source files for details. coreboot is licensed under the terms of the GNU General Public License (GPL). Some files are licensed under the "GPL (version 2, or any later version)", and some files are licensed under the "GPL, version 2". For some parts, which were derived from other projects, other (GPL-compatible) licenses may apply. Please check the individual source files for details. This makes the resulting coreboot images licensed under the GPL, version 2.