On Tue, Dec 19, 2023 at 9:04 PM Marek Vasut <marex@xxxxxxx> wrote:
>
> UART4 is used as CM7 coprocessor debug UART and may not be accessible from
> Linux in case it is protected by RDC. The RDC protection is set up by the
> platform firmware. UART4 is not used on this platform by Linux. Disable
> UART4 by default to prevent boot hangs, which occur when the RDC protection
> is in place.
>
> Fixes: 562d222f23f0 ("arm64: dts: imx8mp: Add support for Data Modul i.MX8M Plus eDM SBC")
> Signed-off-by: Marek Vasut <marex@xxxxxxx>
Reviewed-by: Fabio Estevam <festevam@xxxxxxxxx>
