hi together, I don't understand why I have to skip two 512 blocks for writting the u-boot.bin to the card. Are the IVT in the u-boot.bin? What informations are in the first two 512 blocks of the u-boot.bin?? Thanks for help. edit: Ok I find something: https://github.com/UDOOboard/U-Boot_Uni ... h_header.S The IVT informations are in the u-boot.bin. The Rom-Bootload need the IVT at the adress 0x00000400 ( 512 * 2 = 1024d ==> 0x400h ) So the first 1024 bytes of the u-boot.bin are 0x00.