Add iMX8 NMHW23 build script

build-imx8-nmhw23.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+
+# Stop on error
+
+set -e
+
+# Build boot image
+
+make imx8_nmhw23_defconfig
+export ATF_LOAD_ADDR=0x80000000
+export BL33_LOAD_ADDR=0x80020000
+make flash.bin
+
+# Generate boot image
+
+dd if=u-boot.itb of=flash.bin bs=512 seek=528
+
+# Generate eMMC/SD image
+
+dd if=flash.bin of=flash.sd bs=1k seek=32 conv=fsync