Support (accelerated) for the SiS 86C201, 86C202, 86C205, 86C215, 86C225, 5597, 5598, 6326, 530, 620, 300, 630 and 540 is provided by the XF86_SVGA server with the sis driver.
Support (accelerated) for the SiS 5597, 5598, 6326, 530, 620, 300, 540, 630, 730, 315, 550, 650, 651 and 740 is provided by the "sis" driver. The Xabre (SiS 330) might be supported by this is completely untested.
Support for the 86C201, 86C202, 86C205, 86C215 and 86C225 is currently only available in 3.3.6. Support for some newer chipsets is only available in 4.3.0.