new G4 dual 1 gig is here - how to install?

Kevin B. Hendricks kevin.hendricks at
Fri Feb 15 22:08:18 EST 2002

Hi Ani,

A couple of problems.

1. Checking the BIOS scratch register


        if (rinfo->hasCRTC2) {
                /* primary DVI port */
                if (tmp & 0x08)
                        rinfo->dviDisp_type = MT_DFP;

To determine which port on a 7500 is actualy being used does not work on
PPC, so we have to use the OF names and look in the tree to dtermine which
port is working somehow.  Question is how?

2. For some reason I keep getting the following failure message:

                                printk("radeonfb: Failed to detect DFP
panel size\n");
                                return 0;

which means:

        if (radeon_dfp_parse_EDID(rinfo))

        if (!rinfo->got_dfpinfo) {

Somehow rinfo->got_dfpinfo is not being set (yet a received no warning
messages about EDID not being detected).

The OF device tree does have the "EDID" block but for some reason it is
not being found properly (the dual head issue of the 7500 leading to two
different device tree nodes?) or not being parsed properly.

But I never received the following message:

        if (!radeon_get_EDID_OF(rinfo))
                RTRACE("radeonfb: could not retrieve EDID from OF\n");

And I never received this message either:

        printk("radeonfb: detected DFP panel size from EDID: %dx%d\n",
                rinfo->panel_xres, rinfo->panel_yres);

        rinfo->got_dfpinfo = 1;

And instead I always get just The "Failed to detect DFP panel size"

I can't figure it out.

I will add some more debug print statements so that I can actually see
what is messing up.



On February 13, 2002 10:53, Ani Joshi wrote:
> On Wed, 13 Feb 2002, Kevin B. Hendricks wrote:
> > 2.  The bad news is that my ATI 7500 with my flat panel display simply
> > goes black so I can't tell exactly what is detected or not.
> You will need to check if the OpenFirmware pll probing code I use in
> radeonfb works on 7500.  Look in the device-tree node and see what the
> reference clock is.  If you look in radeon_get_pllinfo() you can see the
> OF probe code there.  IIRC on x86 7500 boards, the xclk is ~ 22000, the
> ref div is 12 and reference clock is 2700 i belive.  The 7500 is
> supported on x86 btw.
> If you can log in and get a bootlog that would be helpful.
> ani

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