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U-Boot reports 2GB of memory on DM8168 EVM

_Ralph_
Guru 10685 points

As title. Why does U-Boot report 2GB of memory on DM8168 EVM at boot time?

This link says the default memory map is 2GB - why?

http://processors.wiki.ti.com/index.php/EZSDK_Memory_Map#Changing_Memory_Map_For_512MB_Board

The EVM only has 1GB of memory on. I have visually checked the board and also checked the schematics.

Thanks,
Ralph

  • 0
    Intellectual 745 points

    Hi Ralph,

    I noticed the same on our board. Haven't checked out the link you mentioned.

    It looks like the uboot source [EZSDK/board-support/u-boot-2010.06-psp04.00.00.12/include/configs/ti8168_evm.h]

    has the PHYS_DRAM_1_SIZE/PHYS_DRAM_2_SIZE macros at 0x40000000 instead of 0x20000000.

    I've changed mine locally and rebuilt and then uboot reports a total of "DRAM: 1 GiB".

    Not sure if this might cause other problems but this did the trick for me.

     

    Hope this helps.

     

    Juan Solis.

     

  • 0 in reply to Juan Solis
    Guru 10685 points

    Hi Juan,

    I saw this source file too and the problem is hard coded into the code.

    Thanks,
    Ralph

  • 0 in reply to Juan Solis
    TI__Expert 5290 points

    The 2GB value is hardcoded. Without memory size detection in place this has been left to max for now. Please change the config option mentioned by Juan as required,

    Regards,

    Vaibhav