The "make menuconfig" help page for "Environment --> Create default
environment from file"
mentions CONFIG_EXTRA_ENV_SETTINGS, but searching for this says "No matches
found",
and also in the saved .config it's missing.
Version info (boot msgs):
U-Boot SPL 2019.04-00077-g48ff1bc4f0-dirty (Apr 11 2019 - 13:43:54 +0200)
DRAM: 1024 MiB
CPU: 912000000Hz, AXI/AHB/APB: 3/2/2
Trying to boot from MMC1
U-Boot 2019.04-00077-g48ff1bc4f0-dirty (Apr 11 2019 - 13:43:54 +0200)
Allwinner Technology
CPU: Allwinner A20 (SUN7I)
Model: Lamobo R1
I2C: ready
DRAM: 1 GiB
MMC: mmc@1c0f000: 0
Loading Environment from FAT... *** Warning - bad CRC, using default environment
...
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