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AM62L: Use both DDR4 4Gb and 8Gb in the same configuration

UMEDEC
Prodigy 20 points

Part Number: AM62L

I'm having trouble obtaining DDR4, so I would like to use both 4Gb and 8Gb without distinguishing between the two available.

I have set the CPU to 8Gb (As following), and the memory node in ATF, U-Boot, and the Linux device tree to 4Gb, and am not using any area exceeding 4Gb.

I would like to know if there are any problems with using it this way.

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  • 0
    TI__Guru**** 175821 points

    Hi,

    The DDR config data files generated by the DDR config tool for each DDR device type are different, you would have to integrate the files specifically to ATF, which means you would have to modify the source code anyway, why do you want to limit Linux to not use all the available memory?

  • 0 in reply to Bin Liu
    Prodigy 20 points

    Hello

    We have only one type of product and only one type of software.
    DDR4 was planned to implement 4Gb.
    However, due to recent difficulties in procuring DDR4, we must procure both 4Gb and 8Gb in order to ensure sufficient quantities to meet demand. For this reason, we want to set up products even for products implemented with 8Gb so that they appear to be 4Gb to users.

  • +1 in reply to UMEDEC
    TI__Guru**** 175821 points

    Hi,

    For the platform which uses 8Gb DDR, you can still add parameter "mem=512M" to the U-Boot bootargs, then Linux can only use up to 512MB, which would be the same as that with 4Gb DDR.