Phoronix send words that AMD has been porting the open-source Radeon Linux driver to Windows Embedded Compact 7 (WEC7) as its graphics driver

It is somewhat surprising that AMD would be porting the open-source Linux driver to a Windows platform rather than using the Catalyst driver as a base. The Catalyst driver code-base is already OS-agnostic for the most part and then there is the Windows and Linux-specific shims. It's disturbing to think just how dirty and crusty the Catalyst code-base actually is, if it's easier for AMD to port a (non-feature-complete) Linux driver to Windows rather than relying upon the mature Catalyst driver and migrating the existing Windows driver interfaces to WEC7. The Linux kernel graphics drivers aren't designed with other operating systems in mind, as even Solaris and FreeBSD are struggling to port Linux GPU drivers.

  AMD Ports Open-Source Linux Driver To Windows Embedded