Arrow SoCkit : generate SD card

Hi everybody,

My goal is to instantiate the HPS SDRAM interface to make FPGA and HPS use the same DDR.

I have many troubles because the waitrequest of the interface is stack to 1 and so the FPGA can't access to the HPS's DDR.

So i decided to regenerate the whole SD card.

According to others threads; with the script make_sdimage.sh with*.dtb, kernel, preloader, u-boot and file system, we can make the correct SD Card.

Is anybody can explain to me step by step how to create u-boot, preloader and especially how to regenerate the SD Card ???

Thanks in advance