[libbsd] README: Mention SMP requirements

[Gedare Bloom]

Thanks.

On Tue, Jun 15, 2021 at 10:45 AM Sebastian Huber
<sebastian.huber at embedded-brains.de> wrote:
>
> ---
>  README.md | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/README.md b/README.md
> index 19c9023e..0438653d 100644
> --- a/README.md
> +++ b/README.md
> @@ -293,3 +293,10 @@ Escape character is '^]'.
>  RTEMS Shell on /dev/pty4. Use 'help' to list commands.
>  TLNT [/] #
>  ```
> +
> +SMP Requirements
> +----------------
> +
> +In order to support EPOCH(9) a scheduler with thread pinning support is
> +required.  This is the case if you use the default scheduler configuration.
> +EPOCH(9) is a central synchronization mechanism of the network stack.
> --
> 2.26.2
>
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