Re: Radeon HD 5770

[Alex Perez <aperez@alexperez.com>]

Johannes,

Johannes Brakensiek wrote on 1/26/2021 10:47 AM:
> Hi,
>
> On 26 Jan 2021, at 15:24, luigi burdo wrote:
>
> > i had been test linux with G5 Quad . Quadro 7800Gtx in 16x slot, 
> > radeonhd on 8x slot.
> > Result, it work with mesa 3D enabled on 4650, 5450, 6570, and R5 220.
> > only 2D working with SI cards 7750, r7 250 because mesa crash for 
> > endianess someware.
> >
> > For have the PC bios card working you need 2 Monitors. one monitor 
> > for the apple firmaware gpu and one for the "pc firmware gpu".
> > This is a video of my g5 with Debian Port (thanx Adrian Glubitz) and 
> > radeonhd 6570 https://www.youtube.com/watch?v=QsB5xlLyZwE&t
> >
> > Ciao
> > Luigi
> > ________________________________
> > Da: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
> > Inviato: martedì 26 gennaio 2021 15:14
> > A: Linux User #330250 <linuxuser330250@gmx.net>
> > Cc: Johannes Brakensiek <ml@codingpastor.de>; 
> > debian-powerpc@lists.debian.org <debian-powerpc@lists.debian.org>
> > Oggetto: Re: Radeon HD 5770
> >
> > Hi!
> >
> > On 1/26/21 3:06 PM, Linux User #330250 wrote:
> > > If the card doesn't have a Firmware with FCode for the Open Firmware of
> > > the Power Mac, it's won't be possible to see anything prior to the 
> > > Linux
> > > boot, where Linux initializes the card using the PC-VideoBIOS.
> > > (...)
> > > The problem is that without an FCode graphics ROM you also don't get 
> > > any
> > > error messages, neither from the Open Firmware (like when it doesn't
> > > find a bootable operating system: the folder symbol with the question
> > > mark in it) or from the early kernel. (early printk)
> >
> > I would probably just use a serial console for the boot sequence.
> >
> > Adrian
>
> thank you for all your replys. Sounds as if it works if I’ve already 
> got a working system (which I have). And it seems to be even easier 
> when using both graphics cards in parallel.
>
> I did not know I can use a serial console with a G5. Going to 
> investigate that as well.
It's possible, and basically involves re-purposing the modem interface, 
which is really just a serial port. See http://www.geethree.com/stealth/ 
for more information.