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Linux/LINUXSDK-OMAPL138: how to modify the uboot and kernel

Nancy Wang
Expert 8210 points
Part Number: LINUXSDK-OMAPL138
Other Parts Discussed in Thread: OMAPL138, OMAP-L138

Tool/software: Linux

I used 128MB LPDDR with omapl138,however,i want to change it to 256M.

I don't know how to modify the uboot and kernel

my uboot version is u-boot-2010.12-psp03.21.00.04

kernel 2.6.37

  • 0
    TI__Guru**** 161600 points
    Hi,

    You can grep the u-boot code to see where ddr is partially configured in u-boot.

    However, for OMAP-L138 the process is NOT the typical linux process. It is as described here: processors.wiki.ti.com/.../OMAP-L138_Bootloader

    "For a typical Linux application, the old flow looked something like this:

    UBL (sets up DDR, PSC, and copies U-Boot to memory)
    U-Boot (loads Linux and file system)
    Linux
    The flow for the OMAP-L138 would look like this:

    AIS-signed U-boot (sets up DDR, PSC, and loads Linux and file system)
    Linux
    So in general, there is not a need for a separate UBL, as the AIS functions can perform most of the same tasks."

    So you need to configure the DDR in AISGen tool, as well. See the Application report for details:
    www.ti.com/.../sprab41e.pdf

    Best Regards,
    Yordan