I have a RS/6000 B50 with a ttyS0 serial console and a modem attached to
ttyS0 and agetty process atteched to ttyS0 as well.
Today I noticed that kernel is logging messages like
Nov 8 16:07:35 spunk kernel: Bogus interrupt -1 from PC = c00dbfa0
Nov 8 16:08:37 spunk kernel: Bogus interrupt -1 from PC = c00dbfa0
every 61 seconds or so.
The /boot/System.map-2.4.2 file gives the following section:
c00dbf48 t rs_set_termios
c00dc0d4 t rs_close
c00dc330 t rs_wait_until_sent
When I remove the agetty process, the messages stop and when I enable it
again, the messages appear again.
I don't know what to think about that. The dial-in is working fine though
and I can't think anything else.
Is it just a message (which I could ignore) or does it mean something is
Perhaps the setup (a modem attached to the serial console and agetty
attached to the serial port as well) is not correct ? I could use another
serial port for testing to see if the messages cease, but its not very
simply done (the machine is a remote one and I would need to call the
housing provider and pay for a visit). Also, I would like to control the
booting of the B50 from the IBM stuff, not just hoping that after kernel
upgrade the new kernel would load correctly and start the agetty on a
port. Using two modems (one for serial console and another for ttyS1
login) doesn't seem to be a effective idea.
The distribution is SuSE 7.1 PPC edition, the kernel is 2.4.2 (SuSE
stock), the agetty line in the inittab is
S0:123:respawn:/sbin/agetty 9600 ttyS0
Thanks in advance,
Aivo Kalu, aivo(a)matti.ee