According to http://xorg.freedesktop.org/wiki/ExaStatus these are the drivers that still don't support EXA:
glide, glint, i740, imstt, newport, impact, rendition, trident, voodoo, apm, cirrus, neomagic, cyrix/nsc, sun, ark, chips, s3, tga, tseng
Do you really think anybody will start a new project based on one of those chips and latest software? Those are not even previous decade, rather previous millennium!
And you are aware that x86 is not the most popular architecture in the embedded market, right?