How to modify L3CNTLREG(L3 controll register) in i195 driver?

[William_Wu1]

I know the offset of L3CNTLREG register, and the default value is 60000060h, and the access type is RW;RO. I want to change its value 0x60000060 to 0x80000040 for enlarging the L3 cache and shrinking the URB space.But after I write the register, I read the value, it still is 0x60000060.

Does anybody know why I cann't modify the value of L3CNTLREG register? And how to modify this register? My platform is Braswell, the os is Linux(kernel version 4.2).Thanks.

[Harshdeep_B_Intel]

Hi William, 

This is a Media forum supporting all Media products. I think you question will be best answered by our Linux driver experts. Please direct your question to graphics driver forum here: https://software.intel.com/en-us/forums/graphics-driver-bug-reporting. ;

Thanks,

[Michael_C_Intel2]

Hi William,

Sorry to do this to you but I need to refer you to another source. This forum is for game developers working on Intel Graphics on Windows. Linux is outside my expertise, else I would help. We do have several support systems in place for Linux:

MESA Driver

For questions and issues with the Mesa driver, your best options are:

• File a bug in Mesa's public bug tracker: https://bugs.freedesktop.org/enter_bug.cgi?product=Mesa . In the component field, select Drivers/DRI./i965.
• Send a message to Mesa's development mailing list http://lists.freedesktop.org/mailman/listinfo/mesa-dev .
• Most of the Intel Mesa developers are on IRC in irc://irc.freenode.net/#intel-gfx or irc://irc.freenode.net/#dri-devel. People there are very helpful.

I suggest that you open a Bugzilla ticket with the information in this post. The team will probably then ask you a lot of clarifying questions (OS? gpu pci id? Mesa version? etc etc).

Also, it's often helpful to directly contact the owner of the Mesa package for your Linux distribution. Sometimes the package owner is very familiar with frequent bugs that are specific to that distribution. On RPM based distros, such as Fedora, you can find the packager by examining the package's changelog with this command: `rpm -q --changelog mesa-libGL`. On Debian based distros, such as Ubuntu, I think the apt-cache command gives you the needed info.

LVDS

For LVDS issues, your best option is to contact one of Intel's kernel graphics developers. You can find them on IRC at irc://irc.freenode.net/#intel-gfx and on the mailing list  http://lists.freedesktop.org/mailman/listinfo/intel-gfx . 

-Michael

[Islam_A_]

Hi William,,

This is a Media forum supporting all Media products. I think you question will be best answered by our Linux driver experts. Please direct your question to graphics driver forum here: https://software.intel.com/en-us/forums/graphics-driver-bug-reporting. 

Thanks,

[Sahan_K_]

just try herehttp://https://software.intel.com/en-us/forums/graphics-driver-bug-reporting.

[Yuli_H_]

Sahan K. wrote:

just try herehttp://https://software.intel.com/en-us/forums/graphics-driver-bug-reporting.

Thank you very much.