[ltp] Some experiences with serial ports, internal modem and

[linux-thinkpad@www.bm-soft.com]

Some remarks on IRQ sharing among serial devices and IR port

 - serial irq sharing must be enabled in the kernel
    + enable questions for `experimental/development' code/drivers
    + under `char devices' enable questions for
      "extended dumb serial driver options"
    + enable "support for sharing serial IRQs"

 - use setpnp -b 0x13 irq 4

 - before trying IRQ sharing, make sure the individual
   devices work.

 - if you intend to share an irq for the built in serial
   port and the IR interface, you _must_ use the irtty
   line discipline, i.e. both devices must use the "serial"
   driver.

 - I also made the experience that after unloading the FIR
   driver, things became sometimes unstable. Especially,=20
   the using the "irtty" after having used the FIR driver
   does _not_ work. BTW: I use dongle_id=3D0x9 for the FIR...

 - IRQ sharing with the MWAVE modem does not work

 - I think it's possible to hack the serial_cs driver
   so IRQ sharing also could work for PCMCMIA modems.

However, IRQ sharing among the DB9 serial and the IR port
DOES WORK - as poster earlier, I can simultaneously communicate
with a palm-pilot (on DB9) and a nokia phone (on ircomm).


Never give up!

-- Till.

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