[Buildroot] Login on a ttyS fails

[Buildroot] Login on a ttyS fails

[Stéphane Mancini]

Hi,
I'm trying to set up linux on a Xilinx platform.
The boot starts but the root login fails 
after prompting :


I've made some prompt in login.c (busybox) and I have the following

################ LOG ######################
boot stuff 
init started: BusyBox v1.12.0 (2008-09-16 16:37:51 CEST)
command='/bin/mount -t proc proc /proc' action=1 tty='/dev/null'

command='/etc/init.d/rcS' action=1 tty=''

command='/sbin/getty -L ttyUL0 57600 vt100 ' action=2 tty='/dev/ttyUL0'

command='/bin/touch /var/log/messages' action=1 tty='/dev/null'

command='/sbin/reboot' action=32 tty=''

command='/sbin/swapoff -a' action=64 tty='/dev/null'

Welcome to the Erik's uClibc development environment.
(none) login: root
Dec 31 17:00:12 login[169]: root login succeeded  on the TTY : 'ttyUL0'
-> /bin/ash
Dec 31 17:00:12 login[169]: Run t


Welcome to the Erik's uClibc development environment.
(none) login: 

#######

I've modified the login.c text to be sure of which code is executing.

It appears that it goes up to the call to the shell. But, then, nothing
happens. 
I've put a 
	syslog(LOG_INFO, "Get to the shell ash!!\n");
at the begining of ash.c:ash_main(int argc UNUSED_PARAM, char **argv)
It's never displayed !

I've also modified inittab to execute "ash" instead of "/init" but
nothing happen also.

It seems that there's a trouble with the shell......

I'm using the Xilinx UARTLITE and the driver comming with linux 2.6.26.2

Maybe there's something wrong with this device but it seems to work
perfectly since I can see all the boot process !

Please, can you tell me :
 what are the configuration parameters to be set to run a a shell on
this tty properly ?
To mean, in buildroot, busybox, libc, linux, etc ....

I set the console on ttyUL0. Is it correct ?

Greetings !

St?phane Mancini


-- 
|St?phane Mancini   Ma?tre de Conference ENSIMAG/GIPSA-lab DIS
| Tel : 04 76 57 43 58
| 961 rue de la Houille Blanche
| Domaine universitaire - BP 46
| 38402 Saint Martin d'H?res cedex
| Email : stephane.mancini at grenoble-inp.fr
| http://www.lis.inpg.fr/pages_perso/mancini
================================================
Join us for the DASIP'08 Conference
ULB, Bruxelles, Belgique
Visit http://www.ecsi.org/dasip/
================================================

[Buildroot] Login on a ttyS fails

[Peter Korsgaard]

>>>>> "St?phane" == St?phane Mancini <stephane.mancini@grenoble-inp.fr> writes:

 St?phane> Hi,
 St?phane> I'm trying to set up linux on a Xilinx platform.
 St?phane> The boot starts but the root login fails 
 St?phane> after prompting :


Probably you have CONFIG_FEATURE_SECURETTY enabled in busybox and
haven't added ttyUL0 to /etc/securetty.

I'll add it to securetty of target/generic shortly.

 St?phane> I'm using the Xilinx UARTLITE and the driver comming with
 St?phane> linux 2.6.26.2

My driver afaik works correctly.

-- 
Bye, Peter Korsgaard

[Buildroot] Login on a ttyS fails

[Stéphane Mancini]

Thanks Peter,
Yes, you're right the driver works correctly.

The behavior of busybox is very strange :
the main of appletlib.c sometime stops before doing anything. The prompt
I've inserted don't appear : they could be not reached or never
displayed ...
Is there a way to trace the shell running ?


Do you mind to send me a configuration file for a ML405 board that
works ?

Greetings

St?phane


Le mardi 16 septembre 2008 ? 20:37 +0200, Peter Korsgaard a ?crit :
> >>>>> "St?phane" == St?phane Mancini <stephane.mancini@grenoble-inp.fr> writes:
> 
>  St?phane> Hi,
>  St?phane> I'm trying to set up linux on a Xilinx platform.
>  St?phane> The boot starts but the root login fails 
>  St?phane> after prompting :
> 
> 
> Probably you have CONFIG_FEATURE_SECURETTY enabled in busybox and
> haven't added ttyUL0 to /etc/securetty.
> 
> I'll add it to securetty of target/generic shortly.
> 
>  St?phane> I'm using the Xilinx UARTLITE and the driver comming with
>  St?phane> linux 2.6.26.2
> 
> My driver afaik works correctly.
> 
-- 
|St?phane Mancini   Ma?tre de Conference ENSIMAG/GIPSA-lab DIS
| Tel : 04 76 57 43 58
| 961 rue de la Houille Blanche
| Domaine universitaire - BP 46
| 38402 Saint Martin d'H?res cedex
| Email : stephane.mancini at grenoble-inp.fr
| http://www.lis.inpg.fr/pages_perso/mancini
================================================
Join us for the DASIP'08 Conference
ULB, Bruxelles, Belgique
Visit http://www.ecsi.org/dasip/
================================================

[Buildroot] Login on a ttyS fails

[Flemming Madsen]

How about a debug line in /etc/inittab:

   ::sysinit:/sbin/strace /bin/sh

/Flemming


On Wed, Sep 17, 2008 at 12:48 PM, St?phane Mancini <
stephane.mancini@grenoble-inp.fr> wrote:

> Thanks Peter,
> Yes, you're right the driver works correctly.
>
> The behavior of busybox is very strange :
> the main of appletlib.c sometime stops before doing anything. The prompt
> I've inserted don't appear : they could be not reached or never
> displayed ...
> Is there a way to trace the shell running ?
>
>
>
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[Buildroot] Login on a ttyS fails

[Peter Korsgaard]

>>>>> "St?phane" == St?phane Mancini <stephane.mancini@grenoble-inp.fr> writes:

Hi,

 St?phane> Thanks Peter,
 St?phane> Yes, you're right the driver works correctly.

Good ;)

 St?phane> The behavior of busybox is very strange : the main of
 St?phane> appletlib.c sometime stops before doing anything. The
 St?phane> prompt I've inserted don't appear : they could be not
 St?phane> reached or never displayed ...  Is there a way to trace the
 St?phane> shell running ?

strace?

Do you still have problems logging in after updating to r23409 (and
rebuilding from scratch)?

 St?phane> Do you mind to send me a configuration file for a ML405
 St?phane> board that works ?

Sorry, I don't have access to a ML405. I've used systems with my
uartlite driver and buildroot without problems though.

-- 
Bye, Peter Korsgaard

[Buildroot] Login on a ttyS fails

[Stéphane Mancini]

Well, I've tried to launch ash after the boot instead of init.
I get a kernel panic :

init has generated signal 4 but has no handler for it

Kernel panic - not syncing: Attempted to kill init!

Rebooting in 180 seconds..


It seems that there is an "illegal instruction".

Is there a way to get the program counter and instruction code that
caused this signal ?
By the way, why the message states that "init" generates the signal
while I launched ash ?

Maybe there are troubles with my processor or the memory is getting
corrupted after I download the kernel....

[Buildroot] Login on a ttyS fails

[Peter Korsgaard]

>>>>> "St?phane" == St?phane Mancini <stephane.mancini@grenoble-inp.fr> writes:

 St?phane> Well, I've tried to launch ash after the boot instead of init.
 St?phane> I get a kernel panic :

 St?phane> init has generated signal 4 but has no handler for it

 St?phane> Kernel panic - not syncing: Attempted to kill init!

 St?phane> Rebooting in 180 seconds..

Did you by any change configure buildroot for hardware floating point
and not enable the FPU emulation in the kernel?

-- 
Bye, Peter Korsgaard

[Buildroot] Login on a ttyS fails

[Stéphane Mancini]

Yes that's it !
It's working.

Please, if you come to Grenoble, I would be happy to offer you a beer !




Le mercredi 17 septembre 2008 ? 14:34 +0200, Peter Korsgaard a ?crit :
> >>>>> "St?phane" == St?phane Mancini <stephane.mancini@grenoble-inp.fr> writes:
> 
>  St?phane> Well, I've tried to launch ash after the boot instead of init.
>  St?phane> I get a kernel panic :
> 
>  St?phane> init has generated signal 4 but has no handler for it
> 
>  St?phane> Kernel panic - not syncing: Attempted to kill init!
> 
>  St?phane> Rebooting in 180 seconds..
> 
> Did you by any change configure buildroot for hardware floating point
> and not enable the FPU emulation in the kernel?
> 
-- 
|St?phane Mancini   Ma?tre de Conference ENSIMAG/GIPSA-lab DIS
| Tel : 04 76 57 43 58
| 961 rue de la Houille Blanche
| Domaine universitaire - BP 46
| 38402 Saint Martin d'H?res cedex
| Email : stephane.mancini at grenoble-inp.fr
| http://www.lis.inpg.fr/pages_perso/mancini
================================================
Join us for the DASIP'08 Conference
ULB, Bruxelles, Belgique
Visit http://www.ecsi.org/dasip/
================================================

[Buildroot] Login on a ttyS fails

[Peter Korsgaard]

>>>>> "St?phane" == St?phane Mancini <stephane.mancini@grenoble-inp.fr> writes:

 St?phane> Yes that's it !
 St?phane> It's working.

Great!

You'll get better performance by using soft float though.

 St?phane> Please, if you come to Grenoble, I would be happy to offer
 St?phane> you a beer !

;)

-- 
Bye, Peter Korsgaard