ATI Radeon 9250, radeonfb

Make sure you uncheck "DDC/I2C for ATI Radeon support", this way we can play with any mode we want without the driver being a smart-ass. You need to modify the file "drivers/video/aty/radeon_base.c", find the function radeon_get_pllinfo, and add the following two lines:
        rinfo->pll.ppll_max = 50000; // add this line
        rinfo->pll.ppll_min = 2000; //and this line

        printk("radeonfb: PLL min %d max %d\n", rinfo->pll.ppll_min, rinfo->pll.ppll_max);
How the ATI pll circuits actually works is still a bit of a mystery to me, as the aproach to calculate dividers is different in this driver compared to the others.

page was last modified: March 18 2007 19:43 CET