mgondium:

I have five mt7620 devices (TPLINK Archer C20v1, C20i) that started having flash write errors at startup with trunk.

Have a similar problem with ar79, could it be related?
https://bugs.openwrt.org/index.php?do=details&task_id=2742&order=id&sort=desc&pagenum=2

OpenWrt SNAPSHOT, r12235-49caf9f98a
Linux OpenWrt 4.14.169 #0 Sat Feb 15 07:57:49 2020 mips GNU/Linux

[ 0.639218] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.

[ 9.296544] jffs2: notice: (414) jffs2_build_xattr_subsystem: complete building xattr subsystem, 4 of xdatum (3 unchecked, 1 orphan) and 16 of xref (1 dead, 0 orphan) found.
[ 37.831875] jffs2: Erase at 0x00378000 failed immediately: errno -22

[ 9.301481] jffs2: notice: (414) jffs2_build_xattr_subsystem: complete building xattr subsystem, 5 of xdatum (3 unchecked, 2 orphan) and 15 of xref (2 dead, 0 orphan) found.
[ 72.033254] jffs2: Erase at 0x00378000 failed immediately: errno -22

[ 9.300037] jffs2: notice: (414) jffs2_build_xattr_subsystem: complete building xattr subsystem, 5 of xdatum (3 unchecked, 2 orphan) and 16 of xref (2 dead, 0 orphan) found.
[ 30.629708] jffs2: Erase at 0x00378000 failed immediately: errno -22

[ 9.294011] jffs2: notice: (414) jffs2_build_xattr_subsystem: complete building xattr subsystem, 5 of xdatum (3 unchecked, 2 orphan) and 15 of xref (2 dead, 0 orphan) found.
[ 31.409183] jffs2: Erase at 0x00378000 failed immediately: errno -22

[ 9.286101] jffs2: notice: (411) jffs2_build_xattr_subsystem: complete building xattr subsystem, 4 of xdatum (3 unchecked, 1 orphan) and 17 of xref (1 dead, 0 orphan) found.
[ 93.305969] jffs2: Erase at 0x00378000 failed immediately: errno -22