Beowulf digest, Vol 1 #1090 - 10 msgs

Alvin Starr alvin at iplink.net
Tue Nov 5 23:39:20 EST 2002


Maurice Hilarius wrote:
> With regards to your message at 05:47 PM 11/5/02, 
> beowulf-request at beowulf.org. Where you stated:
> 
>> From: "David Mathog" <mathog at mendel.bio.caltech.edu>
>> To: beowulf at beowulf.org
>> Subject: Tyan serial console - how?
>> Date: Tue, 05 Nov 2002 12:36:51 -0800
>>
>> I've been trying to get the Tyan serial console working
>> on our rack full of 2466 boards. So far only partial success.
> 
> 
> Some hints:
> When Linux kernel loads you do not get console sent to serial by 
> default, so on your boot command you may wish to add the following 
> kernel parameters:
> console=ttyS0,19200
> This does assume, of course, that when you built your kernel you enabled 
> serial console support.
> In your .config you should see some lines like:
> CONFIG_SERIAL=y
> CONFIG_SERIAL_CONSOLE=y
> 
> Also, note the 19,200 speed.
> In general speeds that are higher than this are not very useful , 
> especially under software (X-on/X-off) flow control are not that good 
> above 19,200.
> 
> You will see some "snow" as the terminal scans the screen on intervals. 
> While irritating, it is harmless.
> 
> Next question is how do you deal with the fact that the terminal 
> keyboards do not make keycodes for "Esc" or "F2" by default?
> 
> 
> Perhaps looking at what a VT100 terminal actually works with may be 
> instructional:
[snip]


Not sure if this will help.

I have had more luck at 9600 baud then at other speeds. I have found 
that it seems to be a common default.

If you are using grub make sure you take out the line that references 
the graphic. It took a long time to figure that one out.

Here is a sample of a grub config I have.
default=0
timeout=10
serial --unit=0 --speed=9600 --word=8 --parity=no --stop=1
terminal --timeout=10 serial console
title Red Hat Linux (2.4.18-17.7.xsmp)
         root (hd0,0)
         kernel /vmlinuz-2.4.18-17.7.xsmp ro root=/dev/md2 console=ttyS0 
panic=10        initrd /initrd-2.4.18-17.7.xsmp.img
title Red Hat Linux (2.4.18-17.7.x)
         root (hd0,0)
         kernel /vmlinuz-2.4.18-17.7.x ro root=/dev/md2 console=ttyS0 
panic=10
         initrd /initrd-2.4.18-17.7.x.img


Here are 2 lines from a working lilo.config I have to use a serial console.
serial=0,9600n8
append="console=ttyS0,9600"



-- 
Alvin Starr                   ||   voice: (416)585-9971
Interlink Connectivity        ||   fax:   (416)585-9974
alvin at iplink.net              ||

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