Are you the one who posted on MOSC too? Creating HFM reports in OBIEE 22.214.171.124
I'm just going to do a copy/paste:
The process has been documented in detail by Oracle in a PDF for OBIEE 126.96.36.199.
For OBIEE 188.8.131.52 you could imagine things were easier as the ADM driver is already there for Hyperion Planning, but apparently it isn't for HFM.
Have a look at this: More to life...: HFM 184.108.40.206 as a data source in OBIEE
It is about HFM 220.127.116.11 but Jon said:
I am going to concentrate on the process to get running with HFM 18.104.22.168 as this is the first version where the thin driver has to be used and will be in the future, I will be using OBIEE 22.214.171.124 though the process should still be relatively similar when using the thin driver in HFM 126.96.36.199 or OBIEE 188.8.131.52
So look the PDF, read Jon's post and you will get most of the infos.
The key element is to use the thin driver and not the native one, that's the key to make it work on your linux OBIEE.
In addition to the above: look at the official documentation.