rockchip RK3399 emmc booting

Hi,

I'm trying to run mainline on a custom rk3399 board which boots from eMMC only. Currently I'm using Rockchip SDK which can build an image for the whole system) and then flash it to emmc using (AFAIU using dfu in u-boot). Does anyone have experience with mainline running on rk3399 and have the same functionality? Or is there another way to flash images to eMMC?

Thanks and BR,

marek