[coreboot] Changing console uart on Bayley Bay CRB

[David Hendricks]

Hi Gailu,
You might need to set an enable bit for the UART2 logical device in the EC.
Can you run superiotool (from coreboot/util/superiotool) to dump the EC
config registers on the CRB?

(I'm just guessing - I've never used a Bayley Bay CRB)

On Fri, Nov 7, 2014 at 8:46 AM, Gailu Singh <gailu96 at gmail.com> wrote:

> Hi,
>
> I got the schematics now and I see that J9B4 is connected to Embedded
> Controller (EC), so I think that this is not 8250 UART2. Am I right?
>
> I am not able to find the documentation what purpose is served by Embedded
> Controller and does coreboot use it at all? Any pointers please. I am
> trying to understand what is the purpose of COM port at J9B4. Any specific
> document that I should refer to to understand it? I checked user guide and
> schematics.
>
> There are 2 com ports I see using usb to serial and Port0 is used for
> console. Is another port on usb to serial is spare and can be used for
> console or is it serving some other purpose in coreboot.
>
>
>
> On Fri, Nov 7, 2014 at 3:51 PM, Gailu Singh <gailu96 at gmail.com> wrote:
>
>> Hi Experts,
>>
>> I have working console uart 0 on Baytrail CRB board. However I am trying
>> to change to uart 2 (J9B4) DB9 connector. I have changed
>> CONFIG_UART_FOR_CONSOLE=2 from menuconfig, cleaned and rebuild and flashed
>> coreboot but do not see any log on port 2. Is there any other changes
>> required apart from CONFIG_UART_FOR_CONSOLE ?
>>
>>
>>
>>
>
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