Download the file Edison Yocto complete image from this site https://communities.intel.com/docs/DOC-23242 .
I’m not sure if I’m following you question. But I would suggest you to download the file Edison Yocto complete image from this site https://communities.intel.com/docs/DOC-23242 . And follow these two guides: https://communities.intel.com/docs/DOC-23200 , https://communities.intel.com/docs/DOC-23149. Let me know if this is what you are asking.
This download image's way , I can use it ! but I want to know ,can I download image to Edison by boot ?
The official should also not released download uboot related programs
flashall? communicating via uboot dfu.