[OpenWrt-Devel] [PATCH] imx6: sysupgrade: document Apalis code handiing rootfs_data

[Rafał Miłecki]

From: Rafał Miłecki <rafal at milecki.pl>

It should help people understand that code and prevent breaking it
during some cleanups.

Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
---
 target/linux/imx6/base-files/lib/upgrade/platform.sh | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/target/linux/imx6/base-files/lib/upgrade/platform.sh b/target/linux/imx6/base-files/lib/upgrade/platform.sh
index c3be9d5424..a290a469ad 100755
--- a/target/linux/imx6/base-files/lib/upgrade/platform.sh
+++ b/target/linux/imx6/base-files/lib/upgrade/platform.sh
@@ -78,6 +78,10 @@ platform_pre_upgrade() {
 
 	case "$board" in
 	apalis*)
+		# On Apalis overlay doesn't get overwriten so it has to be
+		# cleared manually. Call jffs2reset which finds "rootfs_data"
+		# volume (eMMC F2FS partition with such a label) and erases all
+		# files from it.
 		[ "$SAVE_CONFIG" -eq 0 ] && {
 			jffs2reset -y
 			umount /overlay
-- 
2.21.0


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