8xx SMC1 problem

8xx SMC1 problem

[Björn Östby]

Hello everyone,
I have a question regarding the serial init of ttyS0 on a tqm8xx based =
board (823) in denx kernel 2.4.25.

First of, I have three serial ports (SMC1, SMC2 and SCC3) and they all =
work fine when the console is on SMC1. I have gadgets connected to SMC2 =
and SCC3 and now I need SMC1 for yet another device. So I have undefined =
CONFIG_SERIAL_CONSOLE in the kernel config and I jump out of u-boot =
(which have the console on SMC1) with the argument "console=3Dnone".
When logging in (via telnet) ttyS0 works no more (but S1 and S2 does). =
At random bootups, it is possible to open the port but it is no good for =
read or write.

Can anybody give me some advise on how to enable SMC1 but at the same =
time don't have a console on it?

Regards,
Bj=F6rn

Re: 8xx SMC1 problem

[Wolfgang Denk]

In message <004B1D7A5257174C9044A1B7BD0E60ED0178CC68@ratatosk.combitechsystems.com> you wrote:
>
> First of, I have three serial ports (SMC1, SMC2 and SCC3) and they all work
>  fine when the console is on SMC1. I have gadgets connected to SMC2 and SCC
> 3 and now I need SMC1 for yet another device. So I have undefined CONFIG_SE
> RIAL_CONSOLE in the kernel config and I jump out of u-boot (which have the
> console on SMC1) with the argument "console=none".

And did you make sure that no other process is accessing ttyS0 ?

> When logging in (via telnet) ttyS0 works no more (but S1 and S2 does). At r
> andom bootups, it is possible to open the port but it is no good for read o
> r write.
> 
> Can anybody give me some advise on how to enable SMC1 but at the same time
> don't have a console on it?

We did the same (passing console=null) in a couple of  configurations
and  had  no  problems  using SMC1 as standard serial port. Try *not*
undefining CONFIG_SERIAL_CONSOLE.

And please keep your line length < 72 characters or so.

Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de
A committee is a life form with six or more legs and no brain.
                              -- Lazarus Long, "Time Enough For Love"

RE: 8xx SMC1 problem

[Björn Östby]

>From: wd@denx.de [mailto:wd@denx.de]
>Sent: den 16 mars 2006 21:10
>To: Bj=F6rn =D6stby
>Cc: linuxppc-embedded@ozlabs.org
>Subject: Re: 8xx SMC1 problem
>
>In message <004Bxxxxx@ratatosk.combitechsystems.com> you wrote
>>
>> First of, I have three serial ports (SMC1, SMC2 and SCC3) and they =
all
>> work  fine when the console is on SMC1. I have gadgets connected to
>> SMC2 and SCC 3 and now I need SMC1 for yet another device. So I have
>> undefined CONFIG_SE RIAL_CONSOLE in the kernel config and I jump out=20
>> of u-boot (which have the console on SMC1) with the argument
>> "console=3Dnone".
>
>And did you make sure that no other process is accessing ttyS0 ?
>
>> When logging in (via telnet) ttyS0 works no more (but S1 and S2 =
does).
>> At r andom bootups, it is possible to open the port but it is no good
>> for read o r write.
>>
>> Can anybody give me some advise on how to enable SMC1 but at the same
>> time don't have a console on it?
>
>We did the same (passing console=3Dnull) in a couple of  configurations =
and
>had  no  problems  >using SMC1 as standard serial port. Try *not* =
undefining
>CONFIG_SERIAL_CONSOLE.
>

Ahh, "console=3Dnull" worked a lot better than "console=3Dnone".=20
Problem solved!

>
>And please keep your line length < 72 characters or so.
>

I'll see to that.


Regards,
Bj=F6rn =F6stby

Re: 8xx SMC1 problem

[Antonio Di Bacco]

I tried directly with console=3D/dev/null and then I was able to use the se=
rial=20
port from an application.

Bye,
Antonio.


On Friday 17 March 2006 07:55, Bj=F6rn =D6stby wrote:
> >From: wd@denx.de [mailto:wd@denx.de]
> >Sent: den 16 mars 2006 21:10
> >To: Bj=F6rn =D6stby
> >Cc: linuxppc-embedded@ozlabs.org
> >Subject: Re: 8xx SMC1 problem
> >
> >In message <004Bxxxxx@ratatosk.combitechsystems.com> you wrote
> >
> >> First of, I have three serial ports (SMC1, SMC2 and SCC3) and they all
> >> work  fine when the console is on SMC1. I have gadgets connected to
> >> SMC2 and SCC 3 and now I need SMC1 for yet another device. So I have
> >> undefined CONFIG_SE RIAL_CONSOLE in the kernel config and I jump out
> >> of u-boot (which have the console on SMC1) with the argument
> >> "console=3Dnone".
> >
> >And did you make sure that no other process is accessing ttyS0 ?
> >
> >> When logging in (via telnet) ttyS0 works no more (but S1 and S2 does).
> >> At r andom bootups, it is possible to open the port but it is no good
> >> for read o r write.
> >>
> >> Can anybody give me some advise on how to enable SMC1 but at the same
> >> time don't have a console on it?
> >
> >We did the same (passing console=3Dnull) in a couple of  configurations =
and
> >had  no  problems  >using SMC1 as standard serial port. Try *not*
> > undefining CONFIG_SERIAL_CONSOLE.
>
> Ahh, "console=3Dnull" worked a lot better than "console=3Dnone".
> Problem solved!
>
> >And please keep your line length < 72 characters or so.
>
> I'll see to that.
>
>
> Regards,
> Bj=F6rn =F6stby
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