RE: Help in setting up serial console on 64 bit machine

From: Dachepalli, Sudhir <>
Date: 2004-03-10 02:04:24
Hello David,

   I have tried with 115200 also. Since it was not working I settled to 9600

   The Serial console was ttyS1. This is because this is the one with which
   I have done some data/text transfer through minicom sessions.
   Also I have checked the status change in FLAGS at /proc/tty/driver/serial
   when minicom is connected.


-----Original Message-----
From: David Mosberger []
Sent: Monday, March 08, 2004 3:28 PM
To: Dachepalli, Sudhir
Cc: 'Linux-Kernel (E-mail)';
Subject: Re: Help in setting up serial console on 64 bit machine


First a general comment: for ia64-specific questions, it's generally
better to ask on

As for your particular issue: the serial console normally is ttyS0,
not ttyS1, so that might be the reason you're not seeing any output.

Also, 9600 baud is rather slow.  If the client-side can handle it,
115200 baud will be much nicer.


>>>>> On Mon, 8 Mar 2004 15:04:04 -0600 , "Dachepalli, Sudhir"
<> said:

  Sudhir> Hello SerialConsole user,
  Sudhir>          I have a problem while setting up serial console to
  Sudhir> direct kernel printk messages to serial console. I dont see
  Sudhir> messages getting displayed.
  Sudhir> My setup --------- 1. IA 64 machine.  2. Redhat AS 3.0
  Sudhir> 3. Kernel 2.4.18-e.37smp 4. Server Hardware : HP rx5670
  Sudhir> Serial Console setup -------------------- 1. I have
  Sudhir> connected serial cable between two linux terminals.  2. open
  Sudhir> minicom on both servers.  3. changed the settings to
  Sudhir> 9600-8-n-1, no h/w flow control, no s/w flow control, stop
  Sudhir> bits =1.  4. I typed some charecters on server 1 and saw the
  Sudhir> charecters appear in server 2's minicom.  5. I typed some
  Sudhir> charecters on server 2 and saw the charecters appear in
  Sudhir> server 1's minicom.  6. I have changed the kernel command
  Sudhir> line for booting the kernel . PLEASE SEE BELOW FOR
  Sudhir> "elilo.conf".  7. label=serial ( elilo entry to boot the
  Sudhir> serial console setup. ) 8. I have also checked the options
  Sudhir> in "make menuconfig" and found everything correct for serial
  Sudhir> console setup.
  Sudhir> After selecting "label=serial" and botting the OS the
  Sudhir> following is the command line from proc.  [root@beast root]#
  Sudhir> cat /proc/cmdline
  Sudhir> BOOT_IMAGE=scsi0:EFI\redhat\vmlinuz-2.4.18-e.37smp
  Sudhir> root=LABEL=/ console=ttyS1,9600n8 console=tty0 ro
  Sudhir> The kernel cmdline seems to be correct but the messages are
  Sudhir> not directed on console.  I have setup serial consoles on 32
  Sudhir> bit machines earlier, but not on 64 bit.
  Sudhir> Please throw me some pointers to make it work.
  Sudhir> regards, sudhir dachepalli
  Sudhir> [root@beast root]# uname -a Linux beast 2.4.18-e.37smp #1
  Sudhir> SMP Tue Aug 5 16:07:26 EDT 2003 ia64 unknown
  Sudhir> [root@beast root]# cat /etc/*release* Red Hat Linux Advanced
  Sudhir> Server release 2.1AS (Derry) prompt timeout=50
  Sudhir> default=2.4.18-e.37smp
  Sudhir> image=vmlinuz-2.4.18-e.37 label=2.4.18-e.37
  Sudhir> initrd=initrd-2.4.18-e.37.img read-only
  Sudhir> append="root=LABEL=/"
  Sudhir> image=vmlinuz-2.4.18-e.37 label=scsi-128 initrd=scsi-128.img
  Sudhir> read-only root=/dev/sda4
  Sudhir> image=vmlinuz-2.4.18-e.37smp label=2.4.18-e.37smp
  Sudhir> initrd=initrd-2.4.18-e.37smp.img read-only
  Sudhir> append="root=LABEL=/"
  Sudhir> image=vmlinuz-2.4.18-e.37smp label=serial
  Sudhir> initrd=initrd-2.4.18-e.37smp.img read-only
  Sudhir> append="root=LABEL=/ console=ttyS1,9600n8 console=tty0"
  Sudhir> image=vmlinuz-2.4.18-e.37smp label=lyq initrd=lyq.img
  Sudhir> read-only append="root=LABEL=/"
  Sudhir> image=vmlinuz-2.4.18-e.37smp label=mpp initrd=mpp.img
  Sudhir> read-only root=/dev/sda4
  Sudhir> image=vmlinuz-2.4.18-e.12smp label=linux
  Sudhir> initrd=initrd-2.4.18-e.12smp.img read-only root=/dev/sda4
  Sudhir> image=vmlinuz-2.4.18-e.12 label=linux-up
  Sudhir> initrd=initrd-2.4.18-e.12.img read-only root=/dev/sda4
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Received on Tue Mar 9 10:06:02 2004

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