Redirecting console output to serial port to capture error message

From: Roger L. Beeman (rlb_at_subako.org)
Date: 11/05/04

  • Next message: Eugene M. Minkovskii: "Re: sane-plustek backend does not work" 
    Date: Thu, 4 Nov 2004 23:14:59 -0800 (PST)
To: freebsd-questions@FreeBSD.org

    I have been trying to capture the error message that I receive when
    trying to boot any of the Release 5.3 beta or release candidate iso
    images on my DEC Personal Workstation 333i+. The system is an LX440
    chipset based dual processor (2x PII 333MHz).

    I have been trying to redirect the error to the serial port and worked
    a while to get to where I learned that this incantation:

    #mkisofs -U -R -V fbsd_bootonly \
    -no-emul-boot -b boot/cdboot -c boot_catalog \
    -o /home/mbcd.iso /home/bootcd/cdrom

    after adding a /boot/loader.conf.local file containing
      console=comconsole

    to the contents of the bootonly.iso copied to /home/bootcd/cdrom would
    actually redirect this much of the output to the serial port:

    /boot/kernel/kernel text=0x4363cc data=0x7cc00+0x4fe20
      syms=[0x4+0x5a690+0x4+0x6f5d8]

    but after that, the error message still pours out only on the video
    console, repeated endlessly, rolling by much too fast to make any
    sense of.

    What am I missing about redirecting the console output? I'm reading
    section 20.6.6.1 of the the "fine" manual, as saying that this should
    do the trick.

    Roger L. Beeman
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  • Next message: Eugene M. Minkovskii: "Re: sane-plustek backend does not work"

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