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AM3359 USB Boot from Embedded USB Flash Module

Paul Joseph
Expert 2795 points
Other Parts Discussed in Thread: AM3359

Can the AM3359 series boot from an embedded USB interface flash module?

  • 0
    Intellectual 350 points

    Yes it can.

    Check section 26.1.5 Booting in the AM335x Technical Reference Manual.

    Regards,

    Valentin

  • 0 in reply to Valentin Ivanov
    Expert 2795 points

    Valentin, thank you.  I read that section, but was unclear if the memory booting can take place via a USB based embedded memory module since the TRM states:

    The memory booting procedure is executed when the booting device type is one of NOR, NAND, MMC or SPI-EEPROM.

    The peripheral booting is executed when the booting device type is Ethernet, USB or UART

     

    From reading the above I was under the impression, the memory boot could not utilize USB, that was for the peripheral booting.  Let me know if I am missing something in my interpretation.

  • 0 in reply to Paul Joseph
    Expert 2280 points

    Paul, not sure my interpretation is correct: with USB base embedded memory module do you mean an USB device implementing Mass Storage Class?

    If this is the case, I think the answer is not, it cannot boot using such a device. For booting purpose, USB interface will be used by ROM bootloader just in peripheral mode, implementing CDC/RNDIS device (i.e. a network interface).

    Regards,

    Max

  • 0 in reply to Qmax
    TI__Genius 9460 points

    Max,

    I think am335x usb boot is supported when usb interface is in peripheral mode and connected to PC in usb-to-ethernet mode. ROM code implements usb RNDIS gadget.

    Ajay