Re: serial ports no longer working after upgrade to RedHat 9

From: Jürgen R. (amerigo_at_ny.com)
Date: 10/25/03

  • Next message: Bill Marcum: "Re: serial ports no longer working after upgrade to RedHat 9" 
    Date: Sat, 25 Oct 2003 07:38:19 GMT

    On Fri, 24 Oct 2003 18:51:57 -0400, Bruce Pennypacker
    <bruce@pennypacker.org> wrote:

    >Hi all,
    >
    >I have two systems that were both recently upgraded to RedHat 9. One
    >was a laptop running both RedHat 8 and Win2K in dual-boot mode. The
    >other is a server that was running RedHat 7.3. Both were recently
    >upgraded to RedHat 9, and since then neither of them have been able to
    >access their respective serial ports. In trying to determine what had
    >happened I noticed that the permissions of /dev/ttyS? had been changed.
    > On an existing 7.3 system they look like this:
    >
    >crw-rw---- 1 root uucp 4, 64 Apr 11 2002 ttyS0
    >crw-rw---- 1 root uucp 4, 65 Oct 24 18:46 ttyS1
    >
    >But on the upgraded RH9 machines they looked like this:
    >
    >crw------- 1 root root 4, 64 Oct 21 12:33 ttyS0
    >crw------- 1 root root 4, 65 Oct 21 12:33 ttyS1
    >
    >I don't know if this was a major problem or not but I changed the
    >permissions back anyway. No matter what I've tried, however, I've been
    >unable to access either serial port since the upgrade. When the systems
    >boot up they do see the ports. The syslog shows the following:
    >
    >Oct 24 17:22:56 homer kernel: ttyS00 at 0x03f8 (irq = 4) is a 16550A
    >Oct 24 17:22:56 homer kernel: ttyS01 at 0x02f8 (irq = 3) is a 16550A
    >
    >Yet whenever I try to use minicom it simply fails to do anything, and
    >mingetty results in the following in the syslog:
    >
    >Oct 24 18:51:16 homer mingetty[954]: /dev/ttyS0: cannot open tty:
    >Operation not permitted
    >Oct 24 18:51:26 homer mingetty[956]: /dev/ttyS1: cannot open tty:
    >Operation not permitted
    >
    >Any thoughts as to what might be happening?

    Yes, you are using an amateur system with no guarantee that anything
    will work.

    >
    >-Bruce
    >

  • Next message: Bill Marcum: "Re: serial ports no longer working after upgrade to RedHat 9"

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