Add X96Q LPDDR3 v1.3 custom U-Boot build and eMMC flash tooling.

Armbian-compatible U-Boot v2025.01 with eMMC, DTB, and flash fixes for the X96Q TV box.

Co-authored-by: Cursor <cursoragent@cursor.com>

scripts/flash-uboot-only.sh

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+# Только U-Boot на eMMC (без перезаписи образа) — запускать на приставке под root
+set -euo pipefail
+
+DIR="$(cd "$(dirname "$0")" && pwd)"
+UBOOT="${1:-${DIR}/../output/u-boot-custom.bin}"
+
+if [[ $EUID -ne 0 ]]; then
+  echo "Запустите: sudo $0 [u-boot-custom.bin]"
+  exit 1
+fi
+
+[[ -f "$UBOOT" ]] || { echo "Нет файла: $UBOOT"; exit 1; }
+
+EMMC=/dev/mmcblk2
+BOOT0=/dev/mmcblk2boot0
+BOOT1=/dev/mmcblk2boot1
+
+echo "=== U-Boot only → $EMMC ==="
+echo "Бинарник: $UBOOT"
+
+echo 0 >/sys/block/mmcblk2boot0/force_ro
+echo 0 >/sys/block/mmcblk2boot1/force_ro
+
+dd if="$UBOOT" of="$EMMC" bs=1024 seek=8 conv=fsync
+dd if="$UBOOT" of="$BOOT0" bs=1024 conv=fsync
+dd if="$UBOOT" of="$BOOT1" bs=1024 conv=fsync
+sync
+
+echo "Готово."