Re: OldWorld ROM Macintoshes

[Cedar Maxwell <cedarmaxwell@mac.com>]

Looks like some folks at Arch fixed this with a custom kernel:

https://bbs.archlinux32.org/viewtopic.php?id=2776

Adrian, Riccardo and others discussed this exact same issue at length 9
years ago, so looks like this isn't new.:

https://linux.debian.ports.powerpc.narkive.com/vQmkxrXj/xorg-fails-on-ati-after-update-mmio-aperture

But this "regression" is just about the Xorg server failing to launch
with Mach64, it has nothing to do with the complete system hang we are
seeing on kernel 6.2+

On Thu, 2025-09-11 at 09:32 -0600, Stan Johnson wrote:
> Hi Cedar,
> 
> On 9/10/25 9:49 AM, Cedar Maxwell wrote:
> > On Mon, 2025-09-08 at 21:15 -0600, Stan Johnson wrote:
> > > ...
> > > > > 
> > > > > My BootX configuration is as follows (working X11 in 6.1.0 in
> > > > > Gentoo):
> > > > >        Kernel: vmlinux-6.1.0-pmac (custom kernel, no modules)
> > > > >        Boot Device: /dev/sda13 (Gentoo partition)
> > > > >        More kernel arguments:
> > > > > video=atyfb:vmode:14,cmode:32,mclk:71
> > > > >        No video driver: checked
> > > > >        Options:
> > > > >          Force SCSI ON: checked
> > > > >          Force video settings: checked
> > > > >          Use specified RAM disk: not checked
> > > > 
> > > > ...
> > 
> > In your Xorg.log it should say which "video=" option you are using.
> > ...
> 
> On a Wallstreet running kernel 6.1 in Gentoo and using twm:
> 
> $ fgrep video xorg.0.log
> [    70.783] Kernel command line: root=/dev/sda13 
> video=atyfb:vmode:14,cmode:32,mclk:71 video=ofonly
> [    72.023] (II) FBDEV(0): hardware: OFfb ATY,RageLT (video memory:
> 3072kB)
> 
> $ cat /proc/cmdline
> root=/dev/sda13 video=atyfb:vmode:14,cmode:32,mclk:71 video=ofonly
> 
> Like you noticed, it appears that "video=ofonly" is also being passed
> since I checked "No video driver".
> 
> See Xorg.0.log_no_video_driver_checked.xz, attached. X11 works.
> 
> If I uncheck "No video driver", video=ofonly is no longer being
> passed 
> to the kernel, and X11 does not work (text login prompt only):
> 
> $ fgrep video Xorg.0.log
> [    66.565] Kernel command line: root=/dev/sda13 
> video=atyfb:vmode:14,cmode:32,mclk:71
> 
> $ cat /proc/cmdline
> root=/dev/sda13 video=atyfb:vmode:14,cmode:32,mclk:71
> 
> See Xorg.0.log_no_video_driver_unchecked.xz, attached. X11 doesn't
> work.
> 
> I think the atyfb driver is the same as Mach64; I see this in
> Xorg.0.log 
> when video=ofonly isn't passed to the kernel:
> 
> $ grep -i Mach64 Xorg.0.log
> [    67.315] (II) LoadModule: "mach64"
> [    67.323] (WW) Warning, couldn't open module mach64
> [    67.323] (EE) Failed to load module "mach64" (module does not
> exist, 0)
> 
> So we may need to investigate why xorg module mach64 doesn't exist in
> /usr/lib/xorg/modules/drivers.
> 
> 
>  > ...