How can i make a fireware with mainline openwrt step by step

Banana Pi BPI-R4/BPI-R3 Mini/BPI-R3/BPI-R64/BPI-R2
1

i make it，but no emmc fireware

2

Please a bit more information

  • which device
  • which steps have you done
  • what is not working, if you expect emmc-image, have you selected it? maybe there is an option to select the bootdevice in menuconfig, so sd or emmc image is built