Re: Re:No backlight control on PowerBook G4

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

On Fri, 2003-11-07 at 20:50, Daniel Egger wrote:
> Am Don, den 06.11.2003 schrieb Benjamin Herrenschmidt um 01:28:
> 
> > No, I told you to use _my_ 2.6 tree which contains a new radeonfb
> > that have not yet been merged upstream.
> 
> Still cannot try this because your kernel wouldn't even survive yaboot.

Can you give details ? It should work just fine, except if I broke
something in the past few days when getting G5 support in, but I didn't
have any other report of this, so...

> With your tree I now have the problem that it doesn't even boot anymore.
> The CHRP kernel which worked before stopped after "CHRP kernel
> loader...", the elf-pmac one still crashes with:
> Elf32 kernel loaded...
> chrpboot starting: loaded at 0x01000000
> heap at 0x00003000
> gunzipping (0x00010000 <- 0x01006cf8:0x01155486)...
> Decrementer exception at %SRR0: 01005804   %SRR1: 00003030
>  ok
> 0 >

Well, you are not supposed to use the zImage.chrp on a PowerMac,
and definitely not from yaboot.

It may have altered some open firmware settings in a bad way.
I suggest you reset your nvram first (hopefully, booting with
cmd-opt-P-R will do the trick).

Last I tried, then just netbooting vmlinux.elf-pmac worked fine
on all the "newworld" models I have here). For yaboot, you need
to load a plain vmlinux binary.

Ben.