From 8fd0268b5f346fba26329c73225c3c425f2658eb Mon Sep 17 00:00:00 2001
From: Daniel Golle <daniel@makrotopia.org>
Date: Fri, 12 Nov 2021 14:54:52 +0000
Subject: [PATCH] mediatek: mt7622: bpi-r64: rewrite MMC uImage.FIT sysupgrade

Similar to mt7623, also no longer use 'blockdev' and stop relying on
in-kernel partition parsers. Instead, strip off all metadata using
'fwtool' while writing the firmware image and scrape the number of
blocks written from 'dd', then use that block offset to stash the
configuration backup.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>
---
 .../mt7622/base-files/lib/upgrade/platform.sh | 29 +++++++++----------
 target/linux/mediatek/mt7622/target.mk        |  2 +-
 2 files changed, 14 insertions(+), 17 deletions(-)

diff --git a/target/linux/mediatek/mt7622/base-files/lib/upgrade/platform.sh b/target/linux/mediatek/mt7622/base-files/lib/upgrade/platform.sh
index 98775c6a13..b9fa055854 100755
--- a/target/linux/mediatek/mt7622/base-files/lib/upgrade/platform.sh
+++ b/target/linux/mediatek/mt7622/base-files/lib/upgrade/platform.sh
@@ -1,5 +1,5 @@
 REQUIRE_IMAGE_METADATA=1
-RAMFS_COPY_BIN='fw_printenv fw_setenv blockdev'
+RAMFS_COPY_BIN='fw_printenv fw_setenv fwtool'
 RAMFS_COPY_DATA='/etc/fw_env.config /var/lock/fw_printenv.lock'
 
 platform_do_upgrade() {
@@ -12,17 +12,12 @@ platform_do_upgrade() {
 		export_partdevice rootdev 0
 		case "$rootdev" in
 		mmc*)
-			blockdev --rereadpt /dev/$rootdev || return 1
-			local fitpart=$(find_mmc_part "production" $rootdev)
-			[ "$fitpart" ] || return 1
-			dd if=/dev/zero of=$fitpart bs=4096 count=1 2>/dev/null
-			blockdev --rereadpt /dev/$rootdev
-			get_image "$1" | dd of=$fitpart
-			blockdev --rereadpt /dev/$rootdev
-			local datapart=$(find_mmc_part "rootfs_data" $rootdev)
-			[ "$datapart" ] || return 0
-			dd if=/dev/zero of=$datapart bs=4096 count=1 2>/dev/null
-			echo $datapart > /tmp/sysupgrade.datapart
+			sync
+			export UPGRADE_MMC_PARTDEV=$(find_mmc_part "production" $rootdev)
+			[ "$UPGRADE_MMC_PARTDEV" ] || return 1
+			export UPGRADE_MMC_IMAGE_BLOCKS=$(($(get_image "$1" | fwtool -i /dev/null -T - | dd of=$UPGRADE_MMC_PARTDEV bs=512 2>&1 | grep "records out" | cut -d' ' -f1)))
+			[ "$UPGRADE_MMC_IMAGE_BLOCKS" ] || return 0
+			dd if=/dev/zero of=$UPGRADE_MMC_PARTDEV bs=512 seek=$UPGRADE_MMC_IMAGE_BLOCKS count=8
 			;;
 		*)
 			CI_KERNPART="fit"
@@ -92,10 +87,12 @@ platform_check_image() {
 }
 
 platform_copy_config_mmc() {
-	[ -e "$UPGRADE_BACKUP" ] || return
-	local datapart=$(cat /tmp/sysupgrade.datapart)
-	[ "$datapart" ] || echo "no rootfs_data partition, cannot keep configuration." >&2
-	dd if="$UPGRADE_BACKUP" of=$datapart
+	if [ ! -e "$UPGRADE_BACKUP" ] ||
+	   [ ! -e "$UPGRADE_MMC_PARTDEV" ] ||
+	   [ ! "$UPGRADE_MMC_IMAGE_BLOCKS" ]; then
+		return
+	fi
+	dd if="$UPGRADE_BACKUP" of="$UPGRADE_MMC_PARTDEV" bs=512 seek=$UPGRADE_MMC_IMAGE_BLOCKS
 	sync
 }
 
diff --git a/target/linux/mediatek/mt7622/target.mk b/target/linux/mediatek/mt7622/target.mk
index 5403bf5f87..92c3f47370 100644
--- a/target/linux/mediatek/mt7622/target.mk
+++ b/target/linux/mediatek/mt7622/target.mk
@@ -2,7 +2,7 @@ ARCH:=aarch64
 SUBTARGET:=mt7622
 BOARDNAME:=MT7622
 CPU_TYPE:=cortex-a53
-DEFAULT_PACKAGES += kmod-mt7615e kmod-mt7615-firmware wpad-basic-wolfssl blockdev uboot-envtools
+DEFAULT_PACKAGES += kmod-mt7615e kmod-mt7615-firmware wpad-basic-wolfssl uboot-envtools
 KERNELNAME:=Image dtbs
 
 define Target/Description