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On the RZG2L platform, the advised TF-A (https://github.com/renesas-rz/rzg_trusted-firmware-a/tree/v2.5/rzg2l) does not pass any DTB blob to U-Boot. On the other hand, the RZG2L part of U-Boot expects a DTB to be passed. It means that if one flashes the latest TF-A as well as the mainline U-Boot, it will crash trying to dereference the NULL DTB pointer before outputing anything. Check if the DTB pointer is NULL before trying to use it. Signed-off-by: Mathieu Othacehe <othacehe@gnu.org> Reviewed-by: Marek Vasut <marek.vasut+renesas@mailbox.org>