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AM3358 -Boot limitations on MMC0

Adam Garrison1
Intellectual 580 points
Other Parts Discussed in Thread: AM3358

Trying to boot AM3358 from MMC0.  It looks like the bus has some limitations.  What are these limitations?

Thanks,

Adam

  • 0
    Intellectual 300 points

    Reference the "AM335x Sitara Processors Technical Reference Manual", Page 4392.

    /************************************************************************/

    •  MMC0 supports booting from the MMC/SD card cage and also supports booting from
       eMMC/eSD/managed NAND memory devices with less than 4GB capacity.
    •  MMC1 supports booting from eMMC/eSD/managed NAND memory device with 4GB capacity or
       greater.
    The restriction is a result of many eMMC devices not being compliant with the eMMC v4.41 specification.
    If you have the need to boot from two different card cages, many MMC/SD cards will boot from MMC1, but
    for maximum compatibility only MMC0 should be used to boot from the card cage. Similarly for maximum compatibility, booting from eMMC/eSD/managed NAND should only be performed on MMC1.

    /***********************************************************************/