Possible Bug, or Possibly don't know what I'm doing.
David Daney
ddaney at avtrex.com
Tue Feb 6 04:46:32 UTC 2007
Andy Kennedy wrote:
> Luciano Miguel Ferreira Rocha wrote:
>> On Wed, Jan 31, 2007 at 04:51:44PM -0600, Andy Kennedy wrote:
>>
>>> Anyone have ANY idea about this??? Anyone else have a
>>> buildroot/busybox setup that uses a serial console?
>>>
>> 3. boot scripts set serial speed:
>> for d in /dev/ttyS* /dev/ttyAM* /dev/ttyUSB*; do
>> [ -e "$d" ] && stty -F $d ospeed 57600
>> done
> Attempted this. Didn't help. To restate my problem (in case some
> kind developer decides to help me):
>
> When I have the kernel command line parameter "console=ttyS0,115200n8"
> I get nice neat output on the serial line up
I think I always use "console=ttyS0,115200,n,8,1"
Try it with commas between the all the comm parameters and see what happens.
Setting init=/bin/sh might help track it down also.
> until the init runs. As soon as init runs, I get missing chars. So,
> I replace the BusyBox init with minit, compiled from source and using
> the uCLibC gcc that I let buildroot make for me. Same problem. For
> some reason, when the system initializes -- after the kernel has
> reported all of its output, my serial console goes splat. When I
> initialize the console using BusyBox (/sbin/getty -L ttyS0 115200
> vt100) I get "X n", where X is {'i', 'g', 's', 'o', 'l', 'm'}, but I
> cannot find a pattern in it. One of these letters will appear each
> time I send enter.
>
> I have tried everything I can think of. There is no script setting
> any of the line speeds -- in fact, I have even attempted to remove the
> scripts and still get the same thing. Removing the
> console=ttyS0,115200n8 (or attempting any variant of it) has no
> affect, except without the console= I get no good output on the line.
> The only thing I haven't attempted yet is to replace the getty with an
> equivalent to see if that makes a difference. I have also tried 9600,
> 38400, 19200, with E8, O8, 2 stop bits, and 1 stop bit in just about
> every combination, but I still cannot get a serial console.
>
> Can anyone offer a suggestion as to how I might fix this -- or some
> other place to start?
>
> Thanks in advance for any help you can offer,
> Andy
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