From abfee183632e6262f04dbf5cceeae1ab18c6bf40 Mon Sep 17 00:00:00 2001
From: Stefan Agner <stefan@agner.ch>
Date: Wed, 29 Dec 2021 15:19:31 +0100
Subject: [PATCH] ODROID XU4: Update U-Boot on eMMC boot partition (#1699)

* ODROID XU4: Update U-Boot on eMMC boot partition

Update the U-Boot on the eMMC boot partition if present. Only write the
first megabyte as the eMMC boot partition might be smaller than the SPL
image and only the first megabyte is occupied by FW/BL1/BL2/TZSW (see
https://wiki.odroid.com/odroid-xu4/software/partition_table#tab__odroid-xu341).
---
 buildroot-external/ota/rauc-hook | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/buildroot-external/ota/rauc-hook b/buildroot-external/ota/rauc-hook
index 549211fdf..9c2ef3c56 100755
--- a/buildroot-external/ota/rauc-hook
+++ b/buildroot-external/ota/rauc-hook
@@ -79,6 +79,14 @@ if [ "${RAUC_SLOT_CLASS}" = "spl" ]; then
         dd if="${RAUC_IMAGE_NAME}" of="${DEVICE_ROOT}" conv=notrunc ${FLAGS} bs=1 count=440
         dd if="${RAUC_IMAGE_NAME}" of="${DEVICE_ROOT}" conv=notrunc ${FLAGS} bs=512 seek=1 skip=1
     fi
+
+    # Flash to eMMC boot partition if necessary
+    if [ "$RAUC_SYSTEM_COMPATIBLE" = "haos-odroid-xu4" ] && [ -b "${DEVICE_ROOT}boot0" ]; then
+        echo "Updating eMMC boot partition"
+        echo 0 > /sys/block/"$(basename "${DEVICE_ROOT}boot0")"/force_ro
+        dd if="${RAUC_IMAGE_NAME}" of="${DEVICE_ROOT}boot0" conv=notrunc ${FLAGS} bs=512 skip=1 count=2047
+        echo 1 > /sys/block/"$(basename "${DEVICE_ROOT}boot0")"/force_ro
+    fi
 fi
 
 ##