Trying to build a UEFI image, but failing

[Carisbrooke]

Hi, I've tried,

sudo docker run -e BOOT_LOADER=uefi -i -t -v "$PWD":/work lx2160a_build $(id -u) $(id -g)

and get:

Adding user build' to group sudo' ...
Adding user build to group sudo
Done.
Repository prefix for images is 2fff64e
Checking all required tools are installed
Building boot loader
Building restool
make: 'install' is up to date.
Building RCW
rm -f
rm -f -r RCW/template.bin
rm -f -rf lx2160acex7
python3 ../rcw.py -i RCW/template.rcw -o RCW/template.bin
Build u-boot
arch/../configs/lx2160acex7_tfa_defconfig:96:warning: override: reassigning to symbol RTC_PCF2127

Which seems to be building u-boot still, any ideas?