Currently I can not boot u-boot from SD. it have the same problem. But I can boot u-boot completely from eMMC after following your instruction My preloader for SD: preloader_iotg7623Np1_sd_1333M.bin and my preloader for emmc is BPI-R2-EMMC-boot0-DDR1600-20190722-0k.img.gz U-boot version: https://github.com/frank-w/u-boot.git
Can you suggest to me some step to fix this issue ?
Thank so much