

Ulrich
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Ulrich's post in Boot without uImage was marked as the answer
Problem solved... My ignorance... For inexplicable reasons, u-boot was updated without an error message, but actually NOT written to the SD card. The ancient version apparently cannot start without uImage. Now I have manually written the SD card - more precisely an image of it - with the new u-boot and then wrote a new SD card from that image, uImage can be deleted and it runs...