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Old 01-28-2004, 10:07 PM   #1
jwjensen
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Registered: Jan 2004
Posts: 12

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Question Kernel 2.6.1 versus USRobotics/3Com 5610 Fax/Modem


Am running RH9 on an SMP Athlon box. I have a USRobotics PCI modem, with 16550 chip. It works fine under 2.4.24, but I've had no luck getting it running under 2.6.1. I've researched just about all the documentation I can think of, but no joy. KPPP is able to talk to the modem, and initiate a connection. But when a connection succeeds, the attempt to start PPPD fails with error 4 (the kernel doesn't support PPP or the PPP module can't be found). In fact, PPP doesn't exist, but rather PPP_GENERIC does. If I manually modprobe PPP_GENERIC, then KPPP gets a little farther, but fails with PPPD error 7 (unable to open serial port). Again, KPPP is able to exchange commands and responses to the modem, but fails in its (apparently spurious) attempt to launch PPPD.

Here are the relevant fragments of my .config file:

#
# Networking support
#
...
CONFIG_PPP=m
CONFIG_PPP_FILTER=y
CONFIG_PPP_ASYNC=m
CONFIG_PPP_SYNC_TTY=m
CONFIG_PPP_DEFLATE=m
CONFIG_PPP_BSDCOMP=m
CONFIG_SLIP=m
CONFIG_SLIP_COMPRESSED=y
CONFIG_SLIP_SMART=y
CONFIG_SLIP_MODE_SLIP6=y
...
#
# Serial drivers
#
CONFIG_SERIAL_8250=y
# CONFIG_SERIAL_8250_CONSOLE is not set
CONFIG_SERIAL_8250_NR_UARTS=1
# CONFIG_SERIAL_8250_EXTENDED is not set

#
# Non-8250 serial port support
#
CONFIG_SERIAL_CORE=y

Here are some entries in modprobe.conf:

alias ppp0 ppp
alias ppp1 ppp
alias tty-ldisc-1 slip
alias tty-ldisc-11 irtty
alias char-major-108 ppp_generic
alias /dev/ppp ppp_generic
alias tty-ldisc-1 slip
alias tty-ldisc-3 ppp_async
alias tty-ldisc-14 ppp_synctty
alias ppp-compress-18 ppp_mppe
alias ppp-compress-21 bsd_comp
alias ppp-compress-24 ppp_deflate
alias ppp-compress-26 ppp_deflate

KPPP is configured to use /dev/modem, which is symlinked to ttyS4.

At times in my hacking, I've gotten KPPP to actually make a connection (I can't reproduce the settings that enabled this minor success); however, none of Ximian Evolution, Mozilla, nor Konqueror would make use of the established connection. Probably this is related to the fact that the Network Device Control tool uses PPP0, which at a lower layer seems to be configured as MODEM0.

In summary, KPPP seems able to talk to the modem, yet the Network Device Control is unable to. I'm guessing that there is some combination of .config parameters in error, and/or /dev symlinking in error, and/or modprobe.conf aliases in error.

I've spent days on this, looked at all sorts of "documentation", tried all sorts of combinations of .config options, but no joy.

I straightforward set of instructions would be most welcome!
 
Old 01-29-2004, 02:25 PM   #2
jwjensen
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Registered: Jan 2004
Posts: 12

Original Poster
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Talking Kernel 2.6.1 versus USRobotics/3Com FaxModem

Success! To the above I changed PPP support from module to built-in, and created a symlink from ppp0 to ttyS4, as in ln -s /dev/ttyS4 /dev/ppp0 It seems with the .config parameters above, the USR modem is known to the kernel as /dev/ttyS4.

Probably there is some way to get this working with PPP support provided as a module, some alias specified in modprobe.conf--but I haven't been able to figure out what is required.
 
  


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