PLL_WR_EN         240 include/video/aty128.h #define PLL_WR_EN				0x00000080
PLL_WR_EN         136 include/video/mach64.h #define PLL_WR_EN			0x02
PLL_WR_EN         511 include/video/radeon.h #define PLL_WR_EN                                  0x00000080