Re: Screen garbled - Was :Re: Kernel panic : VFS : unable to mount root fs
Hi,
> > > > I acquired this old Mac PPC 4400/200
> > When boot-floppy boots I get a nice screenoutput
> with
> > the penguin on top : kernel detects following
> (dmesg
> > output) :
> >
> > MacOs display is /bandit/ATY,264VT
> > Using unsupported 640x480 ATY,264VT at 81800480,
> > depth=8, pitch=640
> > Console: switching to colour frame buffer device
> 80x30
> > fb0: Open Firmware frame buffer device on
> > /bandit/ATY,264VT
> > etc...
> >
> > When I reboot (during the install, after making
> > harddisk bootable) I get no(or garbled)
> screen-output.
> >
> > I've tried different combinations of c -and vmode
> with
> > video=atyfb. With following combinations i get
> output
> > but it is scrolling fast/garbled and not usable. :
> > vmode:6,cmode:8
> > 5 8
> > 14 1
> >
nvsetenv
> > little-endian false
> > real-mode false
> > auto-boot true
> > diag-switch false
> > fcode-debug false
> > oem-banner false
> > oem-logo false
> > use-nvramrc false
> > real-base 0xffffffff
> > real-size 0x100000
> > virt-base 0xffffffff
> > virt-size 0x100000
> > load-base 0x600000
> > pci-probe-list 0xffffffff
> > screen-#columns 0x64
> > screen-#rows 0x28
> > selftest-#megs 0x0
> > boot-device ata/ata-disk@0:0
> > boot-file ata/ata-disk@0:2/vmlinux
>
> On mine, I just put Linux here, not the path to the
> kernel.
> Then the quik.conf Linux label controls the boot.
>
> > video=atyfb:vmode:5,cmode:8
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> I don't know what this is doing in here?
kernel-argument to line above : boot-file (mailer must
have put it on next line)
Changed boot-file to "Linux" : same result.
>
> > diag-device fd-diags
> > diag-file
> > input-device kbd
> > output-device /bandit/ATY,264VT
> > oem-banner
> > oem-logo
> > nvramrc
> > boot-command begin ['] boot catch 1000 ms cr
> again
> >
changed boot-command to "boot" : no result
> > quik.conf:
> >
> > default=Linux
> > timeout=100
> > root=/dev/hda2
> > partition=2
> > image=/vmlinux
> ^^^^^^^^
> quik doesn't grok symlinks, you must have copied
> your kernel there?
yes
> > append="video=atyfb:vmode:5,cmode:8"
> > label=Linux
> > read-only
>
> Things to try:
> * append="video=atyfb:vmode:5"
> * append="video=ofonly"
> * don't append anything
tried these : only with first I get garbled output,
with 2 others NO output.
tried several other combinations : no success.
>
> (append="video=ofonly" is what the standard boot
> floppy uses).
One thing I noticed and find very strange: when I zap
the PRAM (alt-cmd P R) I almost immediatly get the
white screen with the arrow and then the Mac searches
for a bootable disk (Linux boot-floppy or MacOS-disk).
>From the moment I make a change in the PRAM (ie the
boot-device ata/ata-disk@0:0 and boot-file Linux to
boot the Linux-disk), either with nvsetenv or
bootvars, and reboot : I get a garbled screen : I even
don't get the initial white screen : it's garbled too.
I would suspect a hardware problem but then why don't
I get the garbled screen with the Debian boot floppy?
I'm puzzled.
HELP
Johan
=====
Van Johan & Katrien Dewaele²
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