Forum Discussion

DashingR's avatar
DashingR
Icon for New Contributor rankNew Contributor
12 months ago

Unable to access the entire 4GB DDR from Agilex 7 HPS

Dear Intel Support,

Couple of my colleagues, Chander and Ashish, from Tsavorite have already been in touch with you regarding this issue. Here is the case where they had interactions with Intel support;

How to access entire 4GB DDR from Agilex 7 HPS - Intel Community

This issue is still not resolved for us, and we'd like to get a resolution for this. Opening a new case as suggested, as the previous one was closed. We have tried your suggestions and have experimented on our own.

From Linux/uboot (HPS), we are able to access lower 2GiB (0x0 - 0x7FFF_FFFF). Unable to access 2GiB of upper DDR range: 0x10_8000_0000 - 0x10_FFFF_FFFF. Please go through the above link (previous support case) for history on the transactions.

Appreciate your help!

Thank you.

@aikeu @JingyangTeh_Altera @chander

Sw Development

6 Replies

  • TiensungA_Altera's avatar
    TiensungA_Altera
    Icon for New Contributor rankNew Contributor
    8 months ago

    Can you try the change below? This change maps to the SDRAM upper > 2GB to 0x1_0000_0000.

    Technically, 0x1_0000_0000 will map back to 0-2G. So, we should use 0x1_8000_0000 for 2-4G.

    memory {

    reg = < 0 0x00000000 0 0x80000000>,

    <1 0x80000000 0 0x80000000>;

    };

    Thanks

  • chander's avatar
    chander
    Icon for New Contributor rankNew Contributor
    11 months ago

    Hi Jingyang, Teh

    We did try this , but no luck. Is it possible to have a meeting to go over this.

    regards

    Chander

  • tehjingy_Altera's avatar
    tehjingy_Altera
    Icon for Regular Contributor rankRegular Contributor
    11 months ago

    Hi


    Sorry for the late response.

    Do you have an error log that you are experiencing when trying to access the DDR?

    What time slot you are available for a call?



  • tehjingy_Altera's avatar
    tehjingy_Altera
    Icon for Regular Contributor rankRegular Contributor
    10 months ago

    Hi


    As we do not receive any response from you on the previous question/reply/answer that we have provided. Please login to ‘https://supporttickets.intel.com/s/?language=en_US’, view details of the desire request, and post a feed/response within the next 15 days to allow me to continue to support you. After 15 days, this thread will be transitioned to community support. The community users will be able to help you on your follow-up questions.


    Regards

    Jingyang, Teh