 It fails in 8888 formats chooser, but it works for every format in firecube
just fine here on rv280 if i leave in radeon_texture.c just one format in that
function:

 static gl_format radeonChoose8888TexFormat(radeonContextPtr rmesa,
                       GLenum srcFormat,
                       GLenum srcType, GLboolean fbo)
{
    return _radeon_texformat_argb8888;
}

 Also 'fgl_glxgears -fbo' started to work OK and many other games. For example
frogatto fail to work because of this, now start just fine, etc.

 If someone think this is OK, i can sent a patch to mesa-dev?