kdb has no working console and has switched itself off

[Hasan Rashid]

Keith, 
I replaced the boot arguments to (uart) what you see now. 
Kernel command line: auto BOOT_IMAGE=kiCkaSs ro root=301
console=ttyS0,19200n8 console=uart,io,0x3f8,19200n8 reboot=hard hdb=noprobe
hdc=noprobe hdd=noprobe
ide_setup: hdb=noprobe
ide_setup: hdc=noprobe
ide_setup: hdd=noprobe
Initializing CPU#0
Early serial console at I/O port 0x3f8 (options '19200n8')
kdb version 4.4 by Keith Owens, Scott Lurndal. Copyright SGI, All Rights
Reserved
kdb_cmd[0]: defcmd archkdb "" "First line arch debugging"
kdb_cmd[7]: defcmd archkdbcpu "" "archkdb with only tasks on cpus"
kdb_cmd[14]: defcmd archkdbshort "" "archkdb with less detailed backtrace"
kdb_cmd[21]: defcmd archkdbcommon "" "Common arch debugging"

Kdb gets initialized and setup with early console detection. Now when I
press CTRL+A nothing happens. How do I invoke kdb prompt? 

TIA!

Regards, Hasan R.

> -----Original Message-----
> From: kdb-bounce at oss.sgi.com [mailto:kdb-bounce at oss.sgi.com] On Behalf Of
> Keith Owens
> Sent: Thursday, July 17, 2008 2:48 PM
> To: Hasan Rashid
> Cc: 'Scott Lurndal'; 'Jay Lan'; kdb at oss.sgi.com
> Subject: Re: kdb has no working console and has switched itself off
> 
> "Hasan Rashid" (on Thu, 17 Jul 2008 13:34:30 -0700) wrote:
> >Scott,
> >
> >I compiled my kernel with the following:
> >
> ># Hardware I/O ports
> >#
> >CONFIG_SERIO=y
> >CONFIG_SERIO_SERPORT=y
> >
> >#
> ># Character devices
> >#
> ># CONFIG_VT is not set
> ># CONFIG_SERIAL_NONSTANDARD is not set
> >
> >#
> ># Serial drivers
> >#
> >CONFIG_SERIAL_8250=y
> >CONFIG_SERIAL_8250_CONSOLE=y
> >CONFIG_SERIAL_8250_PCI=y
> >CONFIG_SERIAL_8250_NR_UARTS=1
> >CONFIG_SERIAL_8250_RUNTIME_UARTS=1
> ># CONFIG_SERIAL_8250_EXTENDED is not set
> >
> ># Non-8250 serial port support
> >#
> >CONFIG_SERIAL_CORE=y
> >CONFIG_SERIAL_CORE_CONSOLE=y
> >CONFIG_UNIX98_PTYS=y
> >CONFIG_LEGACY_PTYS=y
> >CONFIG_LEGACY_PTY_COUNT=256
> >
> >> -----Original Message-----
> >> From: Scott Lurndal [mailto:scott.lurndal at 3leafsystems.com]
> >> Sent: Thursday, July 17, 2008 1:06 PM
> >> To: Hasan Rashid
> >> Cc: 'Jay Lan'; kdb at oss.sgi.com
> >> Subject: Re: kdb has no working console and has switched itself off
> >>
> >> On Thu, Jul 17, 2008 at 12:47:32PM -0700, Hasan Rashid wrote:
> >> > This is only with the 2.6.22.19 kernel. I have a similar device (WRAP
> >> board)
> >> > with the same setup, just a serial port connected to my computer and
> KDB
> >> > works just fine on that.
> >> >
> >> > ....
> >> > .....
> >> > kdb: Initialization failed - no console.  kdb is disabled.
> >> > kdb version 4.4 by Keith Owens, Scott Lurndal. Copyright SGI, All
> Rights
> >>
> >> Did you build your 2.6.22.19 with CONFIG_SERIAL_CONSOLE,
> >> CONFIG_SERIAL_8250_CONSOLE or CONFIG_SERIAL_CORE_CONSOLE?
> 
> Your serial console is not being detected early enough (or not at all).
> You might need boot parameters console=ttyS0[,options] or
> console=uart,io,<addr>[,options] to ensure that the serial console is
> detected before kdb starts.  See linux/Documentation/kernel-
> parameters.txt.
> There was a change to the kernel about a year ago to avoid probing
> non-existent serial hardware.  That change avoided errors on some
> hardware, but unfortunately required extra boot parameters for early
> console bringup.
> 
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