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 <[email protected]> --- 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@e14/ethernet-phy@1", "reg"); } -- 2.47.2
