[Xpert]Problems with driver for "SIS 315"

[PUJOmania!]

Hi,   I have got a SIS video card, "AG315P-64" and I don't know how I can configure it with XFree86. I have RedHat 7.2 with XFree86-4.0.1-1 and the sis driver don't support the card. And the manufacturer don't support the driver. Only I can start X with a resolution of 640x480 with 16 colors!   Could anybody help me?   Thanks.