add missing files for build

uboot-rock64/boot.txt

@@ -0,0 +1,22 @@
+# After modifying, run ./mkscr
+
+# MAC address (use spaces instead of colons)
+setenv macaddr da 19 c8 7a 6d f4
+
+part uuid ${devtype} ${devnum}:${bootpart} uuid
+setenv bootargs console=ttyS2,1500000 root=UUID=${uuid} rw rootwait earlycon=uart8250,mmio32,0xff130000 audit=0
+#setenv bootargs console=ttyS2,1500000 root=LABEL=ROOTFS rootfstype=btrfs rootflags=subvol=@ rw rootwait earlycon=uart8250,mmio32,0xff130000 audit=0
+setenv fdtfile rockchip/rk3328-rock64.dtb
+
+if load ${devtype} ${devnum}:${bootpart} ${kernel_addr_r} /boot/Image; then
+  if load ${devtype} ${devnum}:${bootpart} ${fdt_addr_r} /boot/dtbs/${fdtfile}; then
+    fdt addr ${fdt_addr_r}
+    fdt resize
+    fdt set /ethernet@ff540000 local-mac-address "[${macaddr}]"
+    if load ${devtype} ${devnum}:${bootpart} ${ramdisk_addr_r} /boot/initramfs-linux.img; then
+      booti ${kernel_addr_r} ${ramdisk_addr_r}:${filesize} ${fdt_addr_r};
+    else
+      booti ${kernel_addr_r} - ${fdt_addr_r};
+    fi;
+  fi;
+fi

uboot-rock64/mkscr

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+if [[ ! -x /usr/bin/mkimage ]]; then
+  echo "mkimage not found. Please install uboot-tools:"
+  echo "  pacman -S uboot-tools"
+  exit 1
+fi
+
+mkimage -A arm -O linux -T script -C none -n "U-Boot boot script" -d boot.txt boot.scr