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Gokulraj's avatar
Gokulraj
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10 months ago

How to access the 8GB ram of DDR in Agilex 7

Hi, I need to access 8GB DDR ram in agilex dev kit,but now i able to access only 2GB ram.While trying to access the remaining 6GB of ram ot throw error as "TFTP error: trying to overwrite reserve...
Arm Processor
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tehjingy_Altera's avatar
tehjingy_Altera
Icon for Regular Contributor rankRegular Contributor
9 months ago

Hi


Sorry for the late reply.

Could you give me some more time on checking this?

There isn't a clear documentation on why the uboot only use 2GB and the rest was placed under reserve.

Will need to check with some colleague on this behavior.


I believe the full 8GB is accessible in the linux environment right?

This behavior only happens in uboot.


Regards

Jingyang, Teh


  • Gokulraj's avatar
    Gokulraj
    Icon for New Contributor rankNew Contributor
    9 months ago

    Hi

    No,8GB is not accessible in linux environment too.Here the condition is " 1. If u-boot can access 8GB then linux environment can access 8GB of RAM ,2. If u-boot can't access 8GB then linux environment will not access 8GB of RAM".

    Refer u-boot-socfpga-socfpga_v2021.07 version.By using this u-boot version i'm able to access full sdram but unable to write in emmc.

    I have compared the files related to reserved memory and sdram with latest u-boot version but i have no clue were it is configured.It has lots of main files and include files.

    Thanks,

    M Gokulraj