ericwoud [1] filed a deletion request for bpir-uboot-git [2]: Is aarch64, really, it's my package. The x86_64 is only for cross- compiling.
It is to build a uboot.bin for an armv8 development board [1] https://aur.archlinux.org/account/ericwoud/ [2] https://aur.archlinux.org/pkgbase/bpir-uboot-git/
