How to build VIM3.uboot-mainline.emmc.aml.img

The main line version of vim3 emmc uboot is officially available

But when I compile with fenix, when uboot selects mainline, there is no compiling option of the emmc version(only sd-usb).
Is there any other way to compile this img: VIM3.uboot-mainline.emmc.aml.img ?

For compiling mainline firmware, only sd-usb is available. You can execute the following command . Install the firmware to emmc.

$ sudo emmc-install

A311D looks for signed boot firmware in the same locations on SD/USB and eMMC media so the signed u-boot.bin and are functionally equivalent (can be used anywhere).