From: Rafał Miłecki <ra...@milecki.pl>

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

Signed-off-by: Rafał Miłecki <ra...@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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