[PATCH 1/2] Raspberry Pi: Keep warnings from firmware in DT, if any

[Matthias Brugger]

On 12/02/2025 12:39, Fiona Klute wrote:
> The /chosen/user-warnings property is created by the RPi firmware if
> there are warnings to report, keep it to make debugging easier.
> 
> For example, if the firmware config.txt contains
> "dtoverlay=error-example" and that example references an undefined
> symbol "&nosuchdev" the warning can be read after boot:
> 
> $ cat /proc/device-tree/chosen/user-warnings
> dterror: can't find symbol 'nosuchdev'
> Failed to resolve overlay 'error-example'
> 
> Signed-off-by: Fiona Klute <fiona.klute at gmx.de>

Reviewed-by: Matthias Brugger <mbrugger at suse.com>

> ---
>   board/raspberrypi/rpi/rpi.c | 3 +++
>   1 file changed, 3 insertions(+)
> 
> diff --git a/board/raspberrypi/rpi/rpi.c b/board/raspberrypi/rpi/rpi.c
> index 647716127c7..6ca7cd74eff 100644
> --- a/board/raspberrypi/rpi/rpi.c
> +++ b/board/raspberrypi/rpi/rpi.c
> @@ -616,6 +616,9 @@ void  update_fdt_from_fw(void *fdt, void *fw_fdt)
>   	/* kernel address randomisation seed as provided by the firmware */
>   	copy_property(fdt, fw_fdt, "/chosen", "kaslr-seed");
>   
> +	/* warnings from the firmware (if any) */
> +	copy_property(fdt, fw_fdt, "/chosen", "user-warnings");
> +
>   	/* address of the PHY device as provided by the firmware  */
>   	copy_property(fdt, fw_fdt, "ethernet0/mdio at e14/ethernet-phy at 1", "reg");
>   }