Hello Everyone, We have a heads-up for u-boot support as SBL payload. The upstreaming patch has been sent out for review in u-boot community. Once the patch is integrated to u-boot mainline, we will update additional information with detailed instruction. For whom may interest, please refer to https://patchwork.ozlabs.org/patch/1119638/ for the patch and give a try to use it. Build command is below, and the built u-boot which is ELF32 binary can be used as a SBL payload. make slimbootloader_defconfig make Best Regards, Aiden