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Enabling cache in OMAP5432

Thushara Jayakumar
Intellectual 585 points
Other Parts Discussed in Thread: SYSBIOS

Hi,

I'm working with OMAP5432 and CCS version I'm using is 5.5.0.00077.

I'm facing some problem in enabling cache for the target OMAP5432. If I enable the cache in the cfg_script ;the program loaded never hits the main function though it shows its in running state.

With cache disabled I can run my program properly.

Is there any problem in the way I'm enabling cache in cfg_script. 

Screenshot of my cfg_script is given below.

Regards,

Thushara.

  • 0
    TI__Mastermind 21645 points

    Hi Thushara,

    If you enable the M4 cache on OMAP5, you need to ensure that all the memory regions that are used are mapped in the AMMU as either cached or non-cached.

    Here's the link to AMMU cdoc:

    http://software-dl.ti.com/dsps/dsps_public_sw/sdo_sb/targetcontent/bios/sysbios/6_35_04_50/exports/bios_6_35_04_50/docs/cdoc/index.html#ti/sysbios/hal/ammu/AMMU.html

    And here's some example AMMU config code:

    var AMMU = xdc.useModule('ti.sysbios.hal.ammu.AMMU');
    /*********************** Small Pages *************************/
    AMMU.smallPages[2].pageEnabled = AMMU.Enable_YES;
    AMMU.smallPages[2].logicalAddress = 0x20000000;
    AMMU.smallPages[2].translatedAddress = 0x55020000;
    AMMU.smallPages[2].translationEnabled = AMMU.Enable_YES;
    AMMU.smallPages[2].L1_writePolicy = AMMU.WritePolicy_WRITE_BACK;
    AMMU.smallPages[2].L1_allocate = AMMU.AllocatePolicy_ALLOCATE;
    AMMU.smallPages[2].L1_posted = AMMU.PostedPolicy_POSTED;
    AMMU.smallPages[2].L1_cacheable = AMMU.CachePolicy_CACHEABLE;
    AMMU.smallPages[2].size = AMMU.Small_16K;


    AMMU.largePages[0].pageEnabled = AMMU.Enable_YES;
    AMMU.largePages[0].logicalAddress = 0x80000000;
    AMMU.largePages[0].translationEnabled = AMMU.Enable_NO;
    AMMU.largePages[0].size = AMMU.Large_512M;
    AMMU.largePages[0].L1_cacheable = AMMU.CachePolicy_CACHEABLE;
    AMMU.largePages[0].L1_posted = AMMU.PostedPolicy_POSTED;

    Make sure to disbale the cache before loading an executable. If the cache is enabled and the AMMU is not configured correctly, the executable may not load correctly.

    Best,

    Ashish

  • 0 in reply to Ashish Kapania
    Intellectual 585 points

    Hi Ashish,

    I want to enable the DSP cache(c64Tesla) on OMAP5432. Is it possible to configure  AMMU module from DSP core?

    Regards

    Thushara. 

  • 0 in reply to Thushara Jayakumar
    Intellectual 585 points

    Hi Ashish,

    I have tried with the AMMU configuration you have given and it worked for me :) 

    Thanks a lot for your support. We have been struggling with cache for a long time.

    Regards

    Thushara.