From ed49d08762e2eb0a565568a5d48d4d8ffaa6ef30 Mon Sep 17 00:00:00 2001
From: Thibaut VARENE <hacks@slashdirt.org>
Date: Thu, 23 Feb 2017 12:24:05 +0100
Subject: [PATCH] ar71xx: mikrotik: erase firmware partition on SPI NOR devices
in pre_upgrade()
On Mikrotik SPI NOR devices, the firmware partition must be erased when flashing
from stock firmware, otherwise leftover bits (in particular a kernel signature)
can trigger a boot loop.
When booted from initramfs (the only way to flash LEDE on these devices),
this patch unconditionally erases the firmware partition in the pre_upgrade()
stage for all supported SPI NOR devices.
Signed-off-by: Thibaut VARENE <hacks@slashdirt.org>
---
target/linux/ar71xx/base-files/lib/upgrade/platform.sh | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/target/linux/ar71xx/base-files/lib/upgrade/platform.sh b/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
index d48135a6d3..576ff6c06c 100755
--- a/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
+++ b/target/linux/ar71xx/base-files/lib/upgrade/platform.sh
@@ -684,6 +684,14 @@ platform_pre_upgrade() {
wndr4300)
nand_do_upgrade "$1"
;;
+ rb-750-r2|\
+ rb-750up-r2|\
+ rb-941-2nd|\
+ rb-951ui-2nd|\
+ rb-mapl-2nd)
+ # erase firmware if booted from initramfs
+ [ -z "$(rootfs_type)" ] && mtd erase firmware
+ ;;
mr18|\
z1)
merakinand_do_upgrade "$1"
--
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