Re: [Qemu-devel] booting linux 2.6 in qemu-system-ppc

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

On Mon, 2005-05-23 at 12:47 +0200, J. Mayer wrote:
> On Mon, 2005-05-23 at 10:31 +1000, Benjamin Herrenschmidt wrote:
> > > console=ttyS0 console=tty0
> > > Note that the Open-Firmware frame-buffer support is broken in many 2.6
> > > kernels (I mean on real Macs) 
> > 
> > How so ?
> 
> Well, there have been many issues with frame-buffer in 2.6, not only on
> Mac platform.
> With Open-Firmware frame buffer, I remember the first 2.6 kernels had no
> fb output at all.
> Then came kernels that could display a Tux penguin in psychadelic
> colors, I guess it was drawing in 16 bits mode when the OF frame-buffer
> is 15 bits.
> This has been solved in more recent kernels. I don't remember in which
> version it was fixed (but I think around 2.6.5 or 2.6.6).
> I can easily reproduce this on my Ibook and on my Apple Network Server,
> which means it's not a hardware-dependant bug (Ibook 2 has an ATI
> graphic card, ANS is cirrus-logic) nor it's specific to some OF version
> (ANS one is really old...).
> 
> There is now another bug with qemu: with recent 2.6 kernels, the
> frame-buffer is recognized and console is working but it only draws
> characters black on black background, even if I send escape sequences to
> change the drawing color. Note that the penguin is well drawn, in those
> cases.
> If you have an idea of what can cause this, I'd be glad to know it ;-)

I would say the palette isn't set properly ...

Ben.