[U-Boot] DM-SERIAL-SPL on MX6

[Hannes Schmelzer]

Hi Jagan,

maybe you want compare your board to my "brppt2" within my dev-branch:

https://github.com/oe5hpm/u-boot/tree/bur-next-ppt50dm

Once i've finished clean integration into tree i want to get it mainline.

cheers,
Hannes

On 06/18/2018 02:26 PM, Jagan Teki wrote:
> On Thu, Jun 7, 2018 at 4:35 PM, Hannes Schmelzer <hannes at schmelzer.or.at> wrote:
>>>>>>> i'm actually trying to convert my i.mx6 boards to DM, many things are
>>>>>>> already doing well.
>>>>>>> But I've trouble getting the console (UART) runnin SPL.
>>>>>>>
>>>>>>> The "preloader_console_init" is called very early in board_init_f, i
>>>>>>> guess
>>>>>>> that DM isn't ready at this point.
>>>>>>>
>>>>>>> has anyone experience in this?
>>>>>> Yes I've faced the same, look like DEBUG Uart doesn't support low
>>>>>> level init. Peng or someone can explain more.
>>>>> When converting the OPOS6UL to DM, I had to move the
>>>>> preloader_console_init call into the spl_board_init function.
>>>> thanks for this hint, i also tried this. But unfortunately without
>>>> success.
>>>> But it is good to know that this way on your side works.
>>>>
>>>> what i've done to try make it work:
>>>>
>>>> add to my dts:
>>>>       chosen {
>>>>           stdout-path = &uart1;
>>>>       };
>>>>
>>>> &uart1 {
>>>>       u-boot,dm-spl;
>>>>       u-boot,dm-preloc;
>>>>       status = "okay";
>>>> };
>>> Don't you need pins muxing properties in uart1 ( pinctrl-names /
>>> pinctrl-0 ) ?
>>>
>>>> so the device should be present during spl stage and console should be
>>>> set to it.
>>>>
>>>> # Serial drivers
>>>> #
>>>> CONFIG_BAUDRATE=115200
>>>> CONFIG_SERIAL_PRESENT=y
>>>> CONFIG_SPL_SERIAL_PRESENT=y
>>>> CONFIG_DM_SERIAL=y
>>>> CONFIG_SPL_DM_SERIAL=y
>>>> CONFIG_MXC_UART=y
>>>>
>>>> maybe i'm still missing something.
>> Finally converting the tips from Sebastian in addition with converting
>> "CONFIG_SPL_BOARD_INIT" to Kconfig did the trick.
>> Don't know why there is a difference, but doesn't matter since defining such
>> stuff in board-config-header is deprecated.
> imx6ul seems working for me with DM_SERIAL, i.MX6QDL has still not
> getting console.
>
>