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as I was too impatient, I wrote a quick hack for it.
Now I can see my drives on the 3114 controller.
RAID does not seem to work but I can access my SATA drives in normal mode.
hdparm gives a 57 Mb/s output.
I had no error/crash/corruption, it appears to work correctly.
It works on 2.4.23 and 2.6.0-test11 with libata.
basically, you just need to add the PCI id for 3114 just like 3112 in sata_sil.c, load the module and enjoy.
I presume 3112 and 3114 chips are mostly identical.
I have tested this on 2 Tyan motherboards with Sil 3114 inside
I can generate a patch in a few moments if you want it.