[PATCH rtems-docs] user/bsps/imxrt: Info about ARM PLL frequency

[Gedare Bloom]

thanks, that should at least give someone a hint what to do.

On Mon, Jun 21, 2021 at 8:59 AM Christian Mauderer
<christian.mauderer at embedded-brains.de> wrote:
>
> ---
>  user/bsps/arm/imxrt.rst | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
>
> diff --git a/user/bsps/arm/imxrt.rst b/user/bsps/arm/imxrt.rst
> index 8a5ee28..3f8b270 100644
> --- a/user/bsps/arm/imxrt.rst
> +++ b/user/bsps/arm/imxrt.rst
> @@ -123,6 +123,26 @@ with your FDT source names)::
>
>  Make sure that your new C file is compiled and linked into the application.
>
> +PLL Settings
> +------------
> +
> +The commercial variant of the i.MXRT1052 on the evaluation board allows a clock
> +up to 600MHz for the ARM core. For some industrial variants only up to 528MHz
> +are specified. To make it possible to adapt to these variants the application
> +can overwrite the following constant:
> +
> +.. code-block:: c
> +
> +  #include "fsl_clock_config.h"
> +
> +  const clock_arm_pll_config_t armPllConfig_BOARD_BootClockRUN = {
> +      .loopDivider = 100,
> +      .src = 0,
> +  };
> +
> +With the default configuration of a 24MHz oscillator, the loopDivider has to be
> +88 for the 528MHz.
> +
>  Clock Driver
>  ------------
>
> --
> 2.26.2
>