When i did awakening the stuff from return to Ostagar did transfer. Sadly, Starfang didn't. The best I can tell is the equipment from the Keep and Shale's DLC won't transfer. Starfang is an excellent longsword but didn't show up for me. Marc's blade has some nice features and it does transfer. I just added winterforge to my game because I wanted the Warden sword and armor Nexus Mod but i didn't like the stats. Cailan armor has a set bonus: -25% fatigue +5 health regeneration in combat but it might be bugged according to Wiki. Cailan's Arms which is Marc's blade and Cailan Shield also has a great set bonus: Set: +5 damage Set: +5 stamina regeneration in combat.
It is a really nice package for a sword/board player. I found this in Wiki:
"The helmet appearance has been changed in Dragon Age: Origins - Awakening to the whitish plume and silver visor variation of Helm of Hirol's Defense.
The set might not import into Awakening. A Warden wearing the set at the end of Origins may begin Awakening without any armor at all. However, an unofficial mod (found here) will allow transfer of all DLC gear. Make sure the items are in inventory or equipped by the Warden at the time of transfer.
The item set bonus may be lost when imported into Awakening. The bonus can be retained if the armor is summoned using the additem mod; however, selling and buying back the set from a merchant causes the two rune slots on the breastplate to disappear (only seems to happen when selling to Yuriah and Ambassador Cera). This does not happen to Cailan's Arms.
There are several problems with transferring items.
I have a for sure transfer with King Marc's blade and Duncan's shield. I played awakening several times and they always show up.