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riotboot is introduced here and makes use of riotboot_hdr, which indentifies the images encapsulated as slots. The slot size and offset is configurable, which makes slots extendable if needed, e.g. 2 or more slots can be transparently added. Co-authored-by: Kaspar Schleiser <kaspar@schleiser.de> Co-authored-by: Gaëtan Harter <gaetan.harter@fu-berlin.de>