Re: commit 7e92b4fc34 - x86, serial: convert legacy COM ports toplatform devices - broke my serial console

[SÃbastien DuguÃ]

  Hi Bjorn, 

  looks like the commit was dropped, nevertheless here is some more info
to try and understand what may be going on so it may benefit the posterity ;-)

On Tue, 24 Jul 2007 09:48:45 -0600 Bjorn Helgaas <bjorn.helgaas@xxxxxx> wrote:

> On Tuesday 24 July 2007 08:28:05 am SÃbastien Duguà wrote:
> >  your commit 7e92b4fc345f5b6f57585fbe5ffdb0f24d7c9b26 broke the serial console
> > on my box. Adding 'legacy_serial.force=1' to my boot param as a workaround
> > solves the issue, but this may be hiding bugs in Linux PnP support or
> > in my firmware.
> 
> Thanks for your report.  We need to figure out why the 8250_pnp driver
> didn't find your serial console device.  Can you confirm that you also
> have CONFIG_ACPI and CONFIG_PNPACPI in your .config?

  Yep, both =y

CONFIG_ACPI=y
CONFIG_PNPACPI=y

> 
> If you have those, and it still doesn't work, can you collect the DSDT
> dump, the output of "grep . /sys/bus/pnp/devices/*/*", and the dmesg
> from your "legacy_serial.force=1" boot? 

  Please find those attached. I also include the output from dmidecode
just in case (I'm not sure it contains anything interesting in this case
though).

  dsdt.dsl -> DSDT dump
  dmi.txt  -> output from dmidecode
  pnp-info.txt -> output of the grep

  dmesg-ok.txt -> dmesg with 'legacy_serial.force=1' (CONFIG_PNP_DEBUG=y)
  dmesg-bad.txt -> dmesg without 'legacy_serial.force=1' (CONFIG_PNP_DEBUG=y)

> Then we can tell which port
> the blind probe finds and whether it's described somewhere by ACPI.
> 
> Thanks,
>   Bjorn

  Thanks,

  SÃbastien.

> 
> >   The box is a dual HT Xeon running a vanilla 2.6.22 x86_64 kernel
> > 
> >   here is my .config:
> > 
> > CONFIG_PNP=y
> > CONFIG_SERIAL_8250=y
> > CONFIG_SERIAL_8250_CONSOLE=y
> > CONFIG_SERIAL_8250_PCI=y
> > CONFIG_SERIAL_8250_PNP=y
> > CONFIG_SERIAL_8250_NR_UARTS=4
> > CONFIG_SERIAL_8250_RUNTIME_UARTS=4
> > CONFIG_SERIAL_8250_EXTENDED=y
> > CONFIG_SERIAL_8250_SHARE_IRQ=y
> > CONFIG_SERIAL_8250_DETECT_IRQ=y
> > 
> >   lspci output attached.
> >  
> >   Any ideas to help me debug this?
> > 
> >   If you need more info (like DSDT dump), just ask.
> > 
> >   Thanks,
> > 
> >   SÃbastien.
> > 
> > 
> > 
> 
>

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