[U-Boot-Users] switching serial console on or off

[U-Boot-Users] switching serial console on or off

[Konstantin Kletschke]

Hi Folks!

Again I wonder if it is possible to switch off the serial console in
u-boot and only switching it on for debugging purposes so its free for
other applications in the daily work.

I wonder if it is possible to determine a level of a GPIO pin and set
(okay, this will work for sure) an env variable on that. This decides
wether the serial console is enabled or the linux kernel gets booted
silently. 

Is something like that possible?

Kind regards, Konsti

[U-Boot-Users] switching serial console on or off

[Wolfgang Denk]

In message <87r6raloo5.fsf@z1.synertronixx> you wrote:
> 
> Again I wonder if it is possible to switch off the serial console in
> u-boot and only switching it on for debugging purposes so its free for
> other applications in the daily work.

Yes, this is possible.

> I wonder if it is possible to determine a level of a GPIO pin and set
> (okay, this will work for sure) an env variable on that. This decides
> wether the serial console is enabled or the linux kernel gets booted
> silently. 

Yes, this is possible.

> Is something like that possible?

Yes, and it has been implemented before on several boards.

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH, HRB 165235 Munich, CEO: Wolfgang Denk
Office:  Kirchenstr. 5,       D-82194 Groebenzell,            Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
"Pull the wool over your own eyes!"                - J.R. "Bob" Dobbs

[U-Boot-Users] switching serial console on or off

[Konstantin Kletschke]

Wolfgang Denk <wd@denx.de> writes:

> Yes, this is possible.

Okay, that is nice to hear.

> Yes, and it has been implemented before on several boards.

Well, could you or anybody else elaborate a little bit more to mention
me one board of these 223 boards, where this is implemented so I can
look at it?

Currently I am searching for a switch and wonder, if this has to be
deep in /board/<type>/*.[c|S] or if this is a command defined in the
common directory as cmd_xy.c which has only to be used. Or needs to be
created there so it is possible more boards can use it.

Regards, Konsti

-- 
GPG KeyID EF62FCEF
Fingerprint: 13C9 B16B 9844 EC15 CC2E  A080 1E69 3FDA EF62 FCEF

[U-Boot-Users] switching serial console on or off

[Dale Dunlea]

> > Yes, and it has been implemented before on several boards.
>
> Well, could you or anybody else elaborate a little bit more to mention
> me one board of these 223 boards, where this is implemented so I can
> look at it?
>
> Currently I am searching for a switch and wonder, if this has to be
> deep in /board/<type>/*.[c|S] or if this is a command defined in the
> common directory as cmd_xy.c which has only to be used. Or needs to be
> created there so it is possible more boards can use it.

Well, you're trying to change the console, which is common to all
boards, so I'd try looking in /common/console.c.

Then after a quick scan, I'd see "CONFIG_SILENT_CONSOLE" mentioned.
Then I'd run "grep -r CONFIG_SILENT_CONSOLE *", or maybe just #define
CONFIG_SILENT_CONSOLE in the afore mentioned C file.

Regards

[U-Boot-Users] switching serial console on or off

[Wolfgang Denk]

In message <20070328140754.GA4596@anita.doom> you wrote:
> 
> Well, could you or anybody else elaborate a little bit more to mention
> me one board of these 223 boards, where this is implemented so I can
> look at it?

See for example board/tqm5200/tqm5200.c

> Currently I am searching for a switch and wonder, if this has to be
> deep in /board/<type>/*.[c|S] or if this is a command defined in the
> common directory as cmd_xy.c which has only to be used. Or needs to be
> created there so it is possible more boards can use it.

Search for "silent".

Best regards,

Wolfgang Denk

-- 
DENX Software Engineering GmbH, HRB 165235 Munich, CEO: Wolfgang Denk
Office:  Kirchenstr. 5,       D-82194 Groebenzell,            Germany
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
The more we disagree, the more chance there is that at least  one  of
us is right.

[U-Boot-Users] switching serial console on or off

[Konstantin Kletschke]

Am 2007-03-28 16:41 +0200 schrieb Wolfgang Denk:

> See for example board/tqm5200/tqm5200.c

Ah okay, thats enough info for me to cope with.

Based on that I am trying to code a similair setup on our platform.
 
> Search for "silent".

Okay, thanks for the info. I will come back if I can't cope with it
:-)

Best Regards, Konsti

-- 
GPG KeyID EF62FCEF
Fingerprint: 13C9 B16B 9844 EC15 CC2E  A080 1E69 3FDA EF62 FCEF

[U-Boot-Users] switching serial console on or off

[Konstantin Kletschke]

Am 2007-03-28 15:18 +0100 schrieb Dale Dunlea:

> Well, you're trying to change the console, which is common to all
> boards, so I'd try looking in /common/console.c.

Ah! There are pretty much infos.

> Then after a quick scan, I'd see "CONFIG_SILENT_CONSOLE" mentioned.
> Then I'd run "grep -r CONFIG_SILENT_CONSOLE *", or maybe just #define
> CONFIG_SILENT_CONSOLE in the afore mentioned C file.

But is that "switchable" at boot time then?

Regards, Konsti

-- 
GPG KeyID EF62FCEF
Fingerprint: 13C9 B16B 9844 EC15 CC2E  A080 1E69 3FDA EF62 FCEF

[U-Boot-Users] switching serial console on or off

[Konstantin Kletschke]

Am 2007-03-28 16:41 +0200 schrieb Wolfgang Denk:

> See for example board/tqm5200/tqm5200.c

Okay, I found it there and this works here on my Board also.

Sadly the linux kernel arm people insist on putstr() some stuff with
"quiet" option turned on:

Uncompressing
Linux............................................................ done,
booting the kernel.

But this is the linux construction place.

Best Regards, Konsti


-- 
GPG KeyID EF62FCEF
Fingerprint: 13C9 B16B 9844 EC15 CC2E  A080 1E69 3FDA EF62 FCEF