[U-Boot] question: multiple serial

[U-Boot] question: multiple serial

[Ran Shalit]

Hello,

I try to understand what is the right way in U-Boot to configure multiple
serials. I use in my board more 3 UART's , one of them is the console.
Should I define config_serial_multi ? when I did try to do so, I got
"#error No default console" though UART2 is defined as console. Could it be
that da850evm does not support configuration of multiple serials ?

Thank you very much,

Ran

[U-Boot] question: multiple serial

[Albert ARIBAUD]

Hi Ran,

Le 24/02/2011 21:53, Ran Shalit a ?crit :
> Hello,
>
> I try to understand what is the right way in U-Boot to configure multiple
> serials. I use in my board more 3 UART's , one of them is the console.
> Should I define config_serial_multi ? when I did try to do so, I got
> "#error No default console" though UART2 is defined as console. Could it be
> that da850evm does not support configuration of multiple serials ?

The simplest way I see is to inspect the code and trace back from the 
error message to see what exactly triggers this error and why.

One possible way would be to take the command line that results in this 
error and remplace compiler options to just output preprocessed source 
code instead of object code; you'll be able to see if the .h that 
contains the default console is included, and what parts of it are 
compiled exactly.

> Thank you very much,
>
> Ran

Amicalement,
-- 
Albert.

[U-Boot] question: multiple serial

[Stefano Babic]

On 02/24/2011 09:53 PM, Ran Shalit wrote:
> Hello,
> 
> I try to understand what is the right way in U-Boot to configure multiple
> serials.

That is correct.

> I use in my board more 3 UART's , one of them is the console.
> Should I define config_serial_multi ?

Yes

> when I did try to do so, I got
> "#error No default console" though UART2 is defined as console. Could it be
> that da850evm does not support configuration of multiple serials ?

The da850evm uses the NS16550 driver, and multiple uarts are supported.
It seems to me you have not set CONFIG_CONS_INDEX in your config file.

Best regards,
Stefano Babic

-- 
=====================================================================
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: +49-8142-66989-0 Fax: +49-8142-66989-80  Email: office at denx.de
=====================================================================

[U-Boot] question: multiple serial

[ran shalit]

Stefano Babic wrote:
> 
> On 02/24/2011 09:53 PM, Ran Shalit wrote:
>> Hello,
>> 
>> I try to understand what is the right way in U-Boot to configure multiple
>> serials.
> 
> That is correct.
> 
>> I use in my board more 3 UART's , one of them is the console.
>> Should I define config_serial_multi ?
> 
> Yes
> 
>> when I did try to do so, I got
>> "#error No default console" though UART2 is defined as console. Could it
>> be
>> that da850evm does not support configuration of multiple serials ?
> 
> The da850evm uses the NS16550 driver, and multiple uarts are supported.
> It seems to me you have not set CONFIG_CONS_INDEX in your config file.
> 
> Best regards,
> Stefano Babic
> 
> -- 
> =====================================================================
> DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
> Phone: +49-8142-66989-0 Fax: +49-8142-66989-80  Email: office at denx.de
> =====================================================================
> _______________________________________________
> U-Boot mailing list
> U-Boot at lists.denx.de
> http://lists.denx.de/mailman/listinfo/u-boot
> 
> 

Hello Stafno,

Thank you for the reply.
The strange thing is that although the OMAP L138 have the ability for using
more then one UART, it seems that in the u-boot, it is not well supported:
Only if I add in /common/serial.c the following line:
line 45: || defined (CONFIG_MACH_DAVINCI_DA850EVM), and same include in
/common/serial.h
then compiler error is solved. it is as if this file support several cpu's
but the OMAP is not one of them. Is It correct to add this flags in order to
support multiple serials in OMAP L138 EVM ? I tried to ask in TI forum, but
got no reply yet.

Thank you very much,

Ran
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[U-Boot] question: multiple serial

[Stefano Babic]

On 02/27/2011 07:27 PM, ran shalit wrote:

> Hello Stafno,
> 
> Thank you for the reply.
> The strange thing is that although the OMAP L138 have the ability for using
> more then one UART, it seems that in the u-boot, it is not well supported:
> Only if I add in /common/serial.c the following line:
> line 45: || defined (CONFIG_MACH_DAVINCI_DA850EVM), and same include in
> /common/serial.h
> then compiler error is solved. it is as if this file support several cpu's
> but the OMAP is not one of them. Is It correct to add this flags in order to
> support multiple serials in OMAP L138 EVM ? I tried to ask in TI forum, but
> got no reply yet.

I see. Definitely, there is a check on processor tape before checking
the serial driver. As flag you should add CONFIG_SOC_DA8XX instead of
CONFIG_MACH_DAVINCI_DA850EVM, as the last one depends on board, and the
availability of the NS16550 depends on processor.

Best regards,
Stefano Babic

-- 
=====================================================================
DENX Software Engineering GmbH,     MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: +49-8142-66989-0 Fax: +49-8142-66989-80  Email: office at denx.de
=====================================================================

[U-Boot] question: multiple serial

[ran shalit]

Hi,

In the same subject of multiple serials, there is something else which I am
not sure about: All the serial use the same driver (NS16550), but in the
board h. file (da850evm.h) there is the following definition:
#define CONFIG_SYS_NS16550_CLK		clk_get(DAVINCI_UART2_CLKID)
UART2 is the console, but does it mean that the ns16550 CLK, which is used
for the other uart's too should be defined as clk_get(DAVINCI_UART2_CLKID) ?  
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[U-Boot] question: multiple serial

[Graeme Russ]

On Mon, Feb 28, 2011 at 5:27 AM, ran shalit <ranshalit@gmail.com> wrote:
>
>
>
> Stefano Babic wrote:
>>
>> On 02/24/2011 09:53 PM, Ran Shalit wrote:
>>> Hello,
>>>
>>> I try to understand what is the right way in U-Boot to configure multiple
>>> serials.
>>
>> That is correct.
>>
>>> I use in my board more 3 UART's , one of them is the console.
>>> Should I define config_serial_multi ?
>>
>> Yes
>>
>>> when I did try to do so, I got
>>> "#error No default console" though UART2 is defined as console. Could it
>>> be
>>> that da850evm does not support configuration of multiple serials ?
>>
>> The da850evm uses the NS16550 driver, and multiple uarts are supported.
>> It seems to me you have not set CONFIG_CONS_INDEX in your config file.
>>
>> Best regards,
>> Stefano Babic
>>
>> --
>> =====================================================================
>> DENX Software Engineering GmbH, ? ? MD: Wolfgang Denk & Detlev Zundel
>> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany
>> Phone: +49-8142-66989-0 Fax: +49-8142-66989-80 ?Email: office at denx.de
>> =====================================================================
>> _______________________________________________
>> U-Boot mailing list
>> U-Boot at lists.denx.de
>> http://lists.denx.de/mailman/listinfo/u-boot
>>
>>
>
> Hello Stafno,
>
> Thank you for the reply.
> The strange thing is that although the OMAP L138 have the ability for using
> more then one UART, it seems that in the u-boot, it is not well supported:
> Only if I add in /common/serial.c the following line:
> line 45: || defined (CONFIG_MACH_DAVINCI_DA850EVM), and same include in
> /common/serial.h
> then compiler error is solved. it is as if this file support several cpu's
> but the OMAP is not one of them. Is It correct to add this flags in order to
> support multiple serials in OMAP L138 EVM ? I tried to ask in TI forum, but
> got no reply yet.
>

That particular file, as well as /drivers/serial/serial.c (which look very
ns16550 UART specific) have always annoyed me :)

I had the same trouble getting serial to work properly, trying to figure
out how the whole serial architecture fits together

Regards,

Graeme