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'lyh' successfully ported Slackware Linux on Loongson platform today. He says xfce4 and e17 nearly no problem on Slackware-Loongson and he is compiling and testing KDE.
Waiting for his screen shot.
About China-developed Loongson CPU. All are not offcial but from my own point of view.
http://jcst.ict.ac.cn/content/papere.asp?lg=en&i=7101