How to access U-boot environment variables from ls1012afrwy OpenWrt-19.04 Linux?

[paul7]

Board: ls1012afrwy

OpenWRT-19.04

linux-4.14.143

[yipingwang]

Please go to u-boot source code folder build_dir/target-aarch64_generic_musl/uboot-layerscape-ls1046ardb/uboot-layerscape-lsdk-1903, please modify CONFIG_EXTRA_ENV_SETTINGS in include/configs/ls1012afrwy.h.