part deux Re: Radeon 7000 in 9500 - which slot?

Benjamin Herrenschmidt benh at
Thu Oct 17 05:53:39 EST 2002

>It is not detecting the heads properly because on many "mac" radeons, the
>firmware doesn't initialize the SCRATCH registers properly which contain
>information about display type.  There is no reliable method of probing
>display type on ppc so I will end up adding a display type option to
>radeonfb next version.

Well... It should be possible to get that info from OF properties
or is the OF driver broken enough to not export that either ?

How does the MacOS driver to probe displays ? Isn't it possible
to just try the various i2c channels until an EDID is found to
figure what's up ? The CRT port can definitely probe for the
presence of the display by measuring the load on the analog


** Sent via the linuxppc-dev mail list. See

More information about the Linuxppc-dev mailing list