Support (including acceleration) for the AT24, AP6422, AT3D is provided by the XF86_SVGA server with the apm driver.
Support (including acceleration) for the AT24, AT25 and AT3D is provided by the "apm" driver. This driver currently has only incomplete support for the AP6422.
The AP6422 is supported in 3.3.6 but not fully in 4.2.1. All other hardware supported in 3.3.6 is also supported in 4.2.1. The AT25 is supported only in 4.2.1.