Is it possible: TFTP in u-boot to load root filesystem to SD card? (I don't want NFS)

I know we can use NFS, but I just don't want to use it.

(don't want to keep network connection to NFS server all the time).

• I know we can use tftp in u-boot to load kernel and device-tree!
• But can we use tftp in u-boot to download root-filesystem, put it in the right partition of SD card, and boot?
• If yes, how to do it? (I googled, but found no answers)

Thanks, Jerry