Zybo Z7 board - fix SPL uart init bitrate

Hi,

Zybo Z7 board uses 100 MHz clock for UART bitrate generator, in
defconfig is 50 MHz listed. This error manifests itself when boot
starts, following is seen on console:

������b
U-Boot SPL 2019.01 (Jul 17 2019 - 21:36:54 +0200)
mmc boot
Trying to boot from MMC1

First line is output with wrong bitrate. After changing definition to
correct value, boot output starts correctly, now:

Debug uart enabled

U-Boot SPL 2019.10 (Jan 09 2020 - 08:18:37 +0100)
mmc boot
Trying to boot from MMC1

(Please ignore version change, I just used this occasion to fix some
other issues as well.)

Patch to fix this small issue follows. As this is my first contribution
to this project, please help me with what could be necessary to do for
this fix to be accepted, in order to fit any custom used here...

Regards,
Milan

+Luis

čt 9. 1. 2020 v 14:00 odesílatel Milan Obuch <u-boot at dino.sk> napsal:
>
> Hi,
>
> Zybo Z7 board uses 100 MHz clock for UART bitrate generator, in
> defconfig is 50 MHz listed. This error manifests itself when boot
> starts, following is seen on console:
>
> ������b
> U-Boot SPL 2019.01 (Jul 17 2019 - 21:36:54 +0200)
> mmc boot
> Trying to boot from MMC1
>
> First line is output with wrong bitrate. After changing definition to
> correct value, boot output starts correctly, now:
>
> Debug uart enabled
>
> U-Boot SPL 2019.10 (Jan 09 2020 - 08:18:37 +0100)
> mmc boot
> Trying to boot from MMC1
>
> (Please ignore version change, I just used this occasion to fix some
> other issues as well.)
>
> Patch to fix this small issue follows. As this is my first contribution
> to this project, please help me with what could be necessary to do for
> this fix to be accepted, in order to fit any custom used here...
>
> Regards,
> Milan
>
> --- configs/zynq_zybo_z7_defconfig.orig 2020-01-09 08:16:33.744969000 +0100
> +++ configs/zynq_zybo_z7_defconfig      2020-01-09 07:49:33.181891000 +0100
> @@ -5,7 +5,7 @@
>  CONFIG_SPL_STACK_R_ADDR=0x200000
>  CONFIG_SPL=y
>  CONFIG_DEBUG_UART_BASE=0xe0001000
> -CONFIG_DEBUG_UART_CLOCK=50000000
> +CONFIG_DEBUG_UART_CLOCK=100000000
>  CONFIG_DEBUG_UART=y
>  CONFIG_DISTRO_DEFAULTS=y
>  CONFIG_SYS_CUSTOM_LDSCRIPT=y

Luis: Can you please check?

Thanks,
Michal

Hi Michal,

On Tue, Jan 14, 2020 at 5:48 AM Michal Simek <monstr at monstr.eu> wrote:
>
> +Luis
>
> čt 9. 1. 2020 v 14:00 odesílatel Milan Obuch <u-boot at dino.sk> napsal:
> >
> > Hi,
> >
> > Zybo Z7 board uses 100 MHz clock for UART bitrate generator, in
> > defconfig is 50 MHz listed. This error manifests itself when boot
> > starts, following is seen on console:
> > [...]
> > --- configs/zynq_zybo_z7_defconfig.orig 2020-01-09 08:16:33.744969000 +0100
> > +++ configs/zynq_zybo_z7_defconfig      2020-01-09 07:49:33.181891000 +0100
> > @@ -5,7 +5,7 @@
> >  CONFIG_SPL_STACK_R_ADDR=0x200000
> >  CONFIG_SPL=y
> >  CONFIG_DEBUG_UART_BASE=0xe0001000
> > -CONFIG_DEBUG_UART_CLOCK=50000000
> > +CONFIG_DEBUG_UART_CLOCK=100000000
> >  CONFIG_DEBUG_UART=y
> >  CONFIG_DISTRO_DEFAULTS=y
> >  CONFIG_SYS_CUSTOM_LDSCRIPT=y
>
> Luis: Can you please check?

I successfully tested the patch on a Zybo Z7-20 board.
As the description said, the text "Debug uart enabled" is now displayed.

Once the commit is in shape to be merged, feel free to add my Tested-by tag.

Tested-by: Luis Araneda <luaraneda at gmail.com>

Please ping me if the author does not want to send a proper git patch
so I can send it instead. I don't want this work to be lost.

Regards,
Luis Araneda.