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i.mx8 mini, alternatives to uart debug (A53 vs M4)

Question asked by dav1 on Jul 5, 2019
Latest reply on Aug 23, 2019 by dav1



  1. On the imx8 mini, what are the best alternatives to get early print logs from the A53 and/or M4?
       ...all 4 UART's are taken for other things, so can't use these.

    The most convenient would be to run it over a composite usb with cdc
    Jtag would also be a good option since it doesn't eat any valuable gpio's...

  2. Is there any activity or prints on the two uarts during cold-boot / ROM (Serial Downloader)?
    or is all of this explicitly activated in u-boot?