Thanks a lot.
Work fine more than 2 years after with :
Qualcomm Atheros AR8161
LibreElec 9.2.0
Build on Debian 10.2
and minor adaptation (new patch for 5.x kernel is here, use 000-enable-alx-wol-4.18.patch as explain above).
Is it a way to compile only kernel and not the whole image ?