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AM1808-based HW check-list. Chip selects

Filosofi
Intellectual 925 points

Hi all,

On AM1808-based HW check-list

http://processors.wiki.ti.com/index.php/OMAP-L13x_/_C674x_/_AM1x_Schematic_Review_Checklist#USB

I read to check that chip selects go this way for a correct memory map:

  • For booting from NAND devices, make sure EMA_CS[3] is used
  • For booting from NOR devices, make sure EMA_CS[2] is used

Please, is this a HW or SW constraint ?

In my HW configuration I have chosen

64MB 16-bit NOR: EMA_CS[2], EMA_CS[3], EMA_CS[4]

512MB 8-bit NAND: EMA_CS[5]

Is this correct ? Can I boot from either NOR ar NAND with this choice ?

 

Thanks for your help

Gabriele Filosofi

 

 

  • 0
    TI__Genius 17355 points

    Filosofi said:

    I read to check that chip selects go this way for a correct memory map:

    • For booting from NAND devices, make sure EMA_CS[3] is used
    • For booting from NOR devices, make sure EMA_CS[2] is used

    Please, is this a HW or SW constraint ?

    These choices are fixed in the ROM boot loader software, but since that ROM cannot be changed, this is effectively a hardware limitation when it comes to booting.  SO in your case, booting from NAND would be impossible, but booting from NOR would work.

    Regards, Daniel

  • 0 in reply to Daniel Allred
    Intellectual 925 points

    Daniel,

     

    thanks a lot for your support. I will associate CS3 to NAND in order to leave opened the possibility to boot from NAND.

    Gabriele

     

    P.S.

    This solve the issue. Where is the green button to notify it ?