KERNEL_OUTDIR=.output

# Make wrapper
mu() {
    make O=$KERNEL_OUTDIR CROSS_COMPILE=aarch64-linux-gnu- -j"$(nproc --all)" $@
}

# Make and generate boot image wrapper
budt() {
    mu || return 1
    rm "$KERNEL_OUTDIR"/u-boot-nodtb.bin.gz 2>/dev/null || true
    gzip "$KERNEL_OUTDIR"/u-boot-nodtb.bin
   rm -f /tmp/dt.dtb
    for DT in "$@"; do
        cat "$KERNEL_OUTDIR"/arch/arm/dts/"$DT".dtb >> /tmp/dt.dtb
    done
    cat $KERNEL_OUTDIR/u-boot-nodtb.bin.gz /tmp/dt.dtb > /tmp/kernel-dtb

    mkbootimg --base '0x00000000' \
       --kernel_offset '0x00008000' \
       --ramdisk_offset '0x01000000' \
       --tags_offset '0x00000100' \
       --pagesize '4096' \
       --kernel /tmp/kernel-dtb -o '/tmp/u-boot.img'
}