Thank you for your answer !
Yes, I have seen this page.
My concern is that it does not match with Synology link, I was wondering if there is any reason why.
On your link : there is a package for Armada38x (so I guess Armada 385 88F6820 is included).
On Synology link : I was not able to find any Armada 385 in the compatibility list (applied models): no DS116, DS216, DS216j, RS816 etc...
to add a bit more confusion, Even on this thread a couple of page before:
feb 26 - 2016 / march 3 2016 : it was asked by @Brianif DS216 will be supported (armad385 NAS).
@RomanZ answer: Not planned at the moment.
While 2 monthes later around 21-23 may, @Jay Siquelus seems to have successfully installed it on DS116 (armada 385 NAS)