Serial console problem: Id "S0" respawning too fast

Serial console problem: Id "S0" respawning too fast

[Dmitry Vinokurov]

Hello,

I want to set up board only with serial console interface (no tty0).

Kernel bootargs: console=ttyS0,115200n81 root=/dev/nfs rw 
nfsroot=192.168.0.100:/srv/nfs/armrfs ip=dhcp init=/sbin/init

Inittab has only one getty line: S0:2345:respawn:/sbin/getty 115200 ttyS0

I can see boot log, but it is really hard to login. And even if I could 
login, it's impossible to execute any commands, shell dies and login 
message appear again. Here is log of what usually happen:
------------------------------------------------
OpenEmbedded Linux phy3250 ttyS0

minimal .dev-snapshot-20100119 phy3250 ttyS0

phy3250 login: root
O
O
O
OpenEmbedded Linux phy3250 ttyS0

minimal .dev-snapshot-20100119 phy3250 ttyS0

phy3250 login: r
OpenEmbedded Linux phy3250 ttyS0

minimal .dev-snapshot-20100119 phy3250 ttyS0

phy3250 login: root
O
O
INIT: Id "S0" respawning too fast: dis
INIT: no more processes left in this r

O
O
O
O
O
O
O
O
O
INIT: Id "S0" respawning too fast: dis

O
O
O
O
O
O
O
O
O
INIT: Id "S0" respawning too fast: dis
------------------------------------------------

Tried to decrease baudrate to 38400 -- same trouble. Really don't know 
what to do with it. Maybe I miss some kernel or getty options or 
something else?

-- 
Best Regards,
Dmitry Vinokurov
<d.vinokuroff@gmail.com>

Re: Serial console problem: Id "S0" respawning too fast

[Dmitry Vinokurov]

Looked at SERIAL_CONSOLE variable values in different machine conf 
files, added '-L' option to getty string in inittab:
S0:2345:respawn:/sbin/getty -L 115200 ttyS0

Now login and shell works fine.

On 21.01.2010 12:57 Dmitry Vinokurov wrote:
> Hello,
>
> I want to set up board only with serial console interface (no tty0).
>
> Kernel bootargs: console=ttyS0,115200n81 root=/dev/nfs rw 
> nfsroot=192.168.0.100:/srv/nfs/armrfs ip=dhcp init=/sbin/init
>
> Inittab has only one getty line: S0:2345:respawn:/sbin/getty 115200 ttyS0
>
> I can see boot log, but it is really hard to login. And even if I 
> could login, it's impossible to execute any commands, shell dies and 
> login message appear again. Here is log of what usually happen:
> ------------------------------------------------
> OpenEmbedded Linux phy3250 ttyS0
>
> minimal .dev-snapshot-20100119 phy3250 ttyS0
>
> phy3250 login: root
> O
> O
> O
> OpenEmbedded Linux phy3250 ttyS0
>
> minimal .dev-snapshot-20100119 phy3250 ttyS0
>
> phy3250 login: r
> OpenEmbedded Linux phy3250 ttyS0
>
> minimal .dev-snapshot-20100119 phy3250 ttyS0
>
> phy3250 login: root
> O
> O
> INIT: Id "S0" respawning too fast: dis
> INIT: no more processes left in this r
>
> O
> O
> O
> O
> O
> O
> O
> O
> O
> INIT: Id "S0" respawning too fast: dis
>
> O
> O
> O
> O
> O
> O
> O
> O
> O
> INIT: Id "S0" respawning too fast: dis
> ------------------------------------------------
>
> Tried to decrease baudrate to 38400 -- same trouble. Really don't know 
> what to do with it. Maybe I miss some kernel or getty options or 
> something else?
>

-- 
Best Regards,
Dmitry Vinokurov
<d.vinokuroff@gmail.com>