[U-Boot] Enabling uart 3 in arndale

[armdev]

Dear Michael,
Thanks for taking out time to extend help.

As per the RefManual the UART is taking the SCLK_UART Clock and as there are 4 channels (4 UARTS).

Following is from the public exynos 5250 manual (http://www.samsung.com/global/business/semiconductor/file/product/Exynos_5_Dual_User_Manaul_Public_REV100-0.pdf)

"Four independent channels with asynchronous and serial input/output ports for general purpose (Channel 0 to 3), and One channel in ISP (ISP-UART Channel 0)
 …
	• Each UART contains a Baud-rate generator, a Transmitter, a Receiver and a Control Unit. The Baud-rate generator uses SCLK_UART."

-Regards
Armdev Team

On 16-Mar-2014, at 3:55 pm, Michael Trimarchi <michael at amarulasolutions.com> wrote:

> Hi
> 
> On Sun, Mar 16, 2014 at 11:07 AM, armdev <armdev.ftm at gmail.com> wrote:
>> Dear Michael,
>> Yep didn't got any prints. So tried a hack.
>> a) Booted using uart 2
>> b) set the GPACON
>> c) Copied the config from 0x12c20000 to 0x12c30000
>> d)tried to write a char 0x41 (A) on 0x12c20020 0x12c30020, I got output on UART2 but not on UART3.
>> 
>> We would like to use both uarts.
>> Have you used UART3, did the boot to UART3 worked for you ? So you see any problem with any of our steps listed in this / pref mail.
>> 
> 
> Are you sure that you don't need to clock uart logic? I don't have
> such board I'm trying just to help you
> 
> Michael
> 
>> Thanks
>> armdev team
>> 
>> On 16-Mar-2014, at 2:56 pm, Michael Trimarchi <michael at amarulasolutions.com> wrote:
>> 
>>> Hi
>>> 
>>> On Fri, Mar 14, 2014 at 9:04 AM, armdev <armdev.ftm at gmail.com> wrote:
>>>> Hi,
>>>> 
>>>> We are trying to enable the UART3 on COM18 pins of arndale board. The UART3 RXD and TXD are on pins 2 and 4 which as per the base board specification is connected as
>>>> 
>>>> XuRXD3 : UART_3_RXD/GPA1[4] : 2
>>>> XuTXD3 : UART_3_TXD/GPA1[5] : 4
>>>> 
>>>> As per the public reference manual of exynos 5250, there is a register GPACON (0x1140_0000)
>>>> Setting GPACON |= 0x0010_0000 should enable the pins, but I am not able to see any output on UART3.
>>>> 
>>>> Can you please suggest what is the right procedure
>>>> 
>>> 
>>> Did you change the board console output ;)?
>>> 
>>> Michael
>>> 
>>>> -Regards
>>>> armdev team @FTM
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>>> 
>>> 
>>> 
>>> --
>>> | Michael Nazzareno Trimarchi                     Amarula Solutions BV |
>>> | COO  -  Founder                                      Cruquiuskade 47 |
>>> | +31(0)851119172                                 Amsterdam 1018 AM NL |
>>> |                  [`as] http://www.amarulasolutions.com               |
>> 
> 
> 
> 
> -- 
> | Michael Nazzareno Trimarchi                     Amarula Solutions BV |
> | COO  -  Founder                                      Cruquiuskade 47 |
> | +31(0)851119172                                 Amsterdam 1018 AM NL |
> |                  [`as] http://www.amarulasolutions.com               |