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From: Bjorn Helgaas <bjorn.helgaas@hp.com>
To: =?iso-8859-15?q?S=E9bastien_Dugu=E9?= <sebastien.dugue@bull.net>
Subject: Re: commit 7e92b4fc34 - x86, serial: convert legacy COM ports to platform devices - broke my serial console
Date: Tue, 24 Jul 2007 09:48:45 -0600
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On Tuesday 24 July 2007 08:28:05 am Sébastien Dugué 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?

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

Thanks,
  Bjorn

>   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,
> 
>   Sébastien.
> 
> 
>