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AM3352 - Fast External Boot - SYSBOOT[4:0] / 11111b

Patrick GAMBIER
Prodigy 110 points

Hello,

I would like to use the boot sequence  SYSBOOT[4:0]  / 11111b with "Fast External Boot" first, then EMAC1, then UART1.

What happens if there is no XID device connected ? does the processor try to boot with EMAC1 or is there a bus error...

Thanks

  • 0
    TI__Guru* 86180 points

    The ROM checks for 2 values, 0x00000000 and 0xFFFFFFFF, at address 0x08000000.  If it is one of these 2 values, then it assumes there is not a valid image in XIP and moves on to the next booting source (in this case, it would be EMAC1).  If it reads any other value, it assumes there is a valid image and tries to execute it. 

    Without a device attached, internal pulls up are enabled on the data lines by the ROM, so it should read all Fs and move on to EMAC1.

    Regards,

    James

  • 0 in reply to JJD
    Prodigy 110 points

    Thank you for your prompt response.

    TYVMI