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

From: Alex Williamson <alex.williamson_at_hp.com>
Date: 2004-03-10 02:35:47
   Only the ttyS0 port (the one labeled console) can be used for a
serial console on the rx5670.  The other ports aren't initialized early
enough to support a serial console.  The management processor can
support external UARTs up to 38.4kbps (115.2kbps on newer boards), but
it defaults to 9600, and higher speeds must be configured via the CA
command in the MP.  The speed of the kernel console is fairly
independent of the speed of the external port, but I tend to go no
higher than the external port speed.  Hope that helps,

	Alex

On Tue, 2004-03-09 at 08:04, Dachepalli, Sudhir wrote:
> 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.
> 
> regards,
> sudhir
> 
> -----Original Message-----
> From: David Mosberger [mailto:davidm@napali.hpl.hp.com]
> Sent: Monday, March 08, 2004 3:28 PM
> To: Dachepalli, Sudhir
> Cc: 'Linux-Kernel (E-mail)'; linux-ia64@vger.kernel.org
> Subject: Re: Help in setting up serial console on 64 bit machine
> 
> 
> Sudhir,
> 
> First a general comment: for ia64-specific questions, it's generally
> better to ask on linux-ia64@vger.kernel.org.
> 
> 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.
> 
> 	--david
> 
> >>>>> On Mon, 8 Mar 2004 15:04:04 -0600 , "Dachepalli, Sudhir"
> <sudhir.dachepalli@lsil.com> 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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-- 
Alex Williamson                             HP Linux & Open Source Lab

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Received on Tue Mar 9 10:37:51 2004

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