• Using serial console with Pi2 v1.1 firmware

    From bp@bp@www.zefox.net to comp.sys.raspberry-pi on Sun Apr 7 17:40:25 2024
    From Newsgroup: comp.sys.raspberry-pi

    I've got a rather early Pi2 v1.1 (so, armv7) that is getting
    stuck in a netboot loop. Is there a keystroke sequence on the
    serial console that will break out of the loop, or at least
    force a reset?

    The console displays

    ...
    Trying booting from Ethernet device addr 5
    Initialise ethernet with MAC b8:27:eb:1a:5a:4b
    Wait for Link up
    Failed to initialise link
    ...

    Thanks for reading,

    bob prohaska

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  • From Theo@theom+news@chiark.greenend.org.uk to comp.sys.raspberry-pi on Mon Apr 8 12:39:31 2024
    From Newsgroup: comp.sys.raspberry-pi

    bp@www.zefox.net wrote:
    I've got a rather early Pi2 v1.1 (so, armv7) that is getting
    stuck in a netboot loop. Is there a keystroke sequence on the
    serial console that will break out of the loop, or at least
    force a reset?

    I think that's just a debug log, not a console, BICBW... https://github.com/raspberrypi/firmware/wiki/USB-MSD-and-network-boot-debugging

    Theo
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  • From bp@bp@www.zefox.net to comp.sys.raspberry-pi on Tue Apr 9 23:01:52 2024
    From Newsgroup: comp.sys.raspberry-pi

    Theo <theom+news@chiark.greenend.org.uk> wrote:
    bp@www.zefox.net wrote:
    I've got a rather early Pi2 v1.1 (so, armv7) that is getting
    stuck in a netboot loop. Is there a keystroke sequence on the
    serial console that will break out of the loop, or at least
    force a reset?

    I think that's just a debug log, not a console, BICBW... https://github.com/raspberrypi/firmware/wiki/USB-MSD-and-network-boot-debugging


    Thank you, that's an interesting link. I've added an empty file named
    UART to the microSD card's msdos partition to see if behavior changes.

    As it happens, the problem clears up if I power down the Pi, remove and
    replace the microSD card and re-apply power. That makes me wonder if the microSD socket is somehow faulty. It's the early style of push-to-latch, push-to-eject socket. Power cycling alone doesn't clear the fault, moving
    the microSD seems also to be necessary. Does this ring a bell with anyone?

    Thanks for writing!

    bob prohaska

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