Mac OS 9 Discussion > Video Cards, Monitors & Displays

Issues with GeForce 4MX - iMac G4 - M6498 (EMC 1956)

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joevt:
adding banner to the nvramrc script stops the normal boot from doing probe-all install-console banner.

If you were using serial port instead of a non-built-in PCI graphics card for the input/output-device, then you could do install-console first, then add some logging like this:


--- Code: ---install-console
dev / ls device-end
." [ probe-all"
probe-all
." ] probe-all"
dev / ls device-end
." [ banner"
banner
." ] banner"

--- End code ---

The example above will list the devices before and after probe-all

If you're stuck using the screen for input/output, then maybe this will work:


--- Code: ---dev / ls device-end
." [ probe-all"
probe-all
." ] probe-all"
install-console
dev / ls device-end
." [ banner"
banner
." ] banner"

--- End code ---

The logging that happens before install-console is buffered until the console is installed, then the buffered logging is output.

If it doesn't like buffering all that logging, then remove it.

--- Code: ---probe-all
install-console
dev / ls device-end
." [ banner"
banner
." ] banner"

--- End code ---

Basically, you can log each of your commands so that you can find out which one is causing the messages.

You can use one of these commands to view the built-in Open Firmware boot log:

--- Code: ---.time-stamps
.time-stamps\

--- End code ---

Greystash:
Thanks joevt, I've tried both non-serial methods. After running the following it lists out the entire device tree (it ends at the same device as it would if I just ran ` dev / ls`), then begins the `probe-all` command which results in the same "can't OPEN device" error.

--- Code: ---dev / ls device-end
." [ probe-all"
probe-all
." ] probe-all"
install-console
dev / ls device-end
." [ banner"
banner
." ] banner"
--- End code ---

.time-stamps and .time-stamps\ don't work for me, it returns ".time-stamps, unknown word"

joevt:
I think .time-stamps is hidden in some Open Firmware versions. Two options:
1) setenv fcode-debug? true then restart
2) false to check-visible then try the .time-stamps command again.
Probably the first is preferable since you only have to do it once (unless you zap the pram).

probe-all does the following:
push-state
probe-pci
probe-ext-mac-io
probe-usb
probe-fw
finish-device-tree
pop-state   

I suppose you can try probe-pci instead of probe-all. In that case, maybe remove banner so that the normal boot process will do probe-all. It should be smart enough not to repeat the probe-pci part again but I'm not sure.

In either case, you may want to use a catch so that if it fails, the rest of the nvramrc script is executed.

['] probe-pci catch if ." exception:" . . cr then

Greystash:
I managed to get my changes persisting, and narrowed down the `probe-all` issue to the Ethernet device failing to be opened in the `finish-device-tree` step. This happens on all of the G4 machines that I tested.

I've spent a lot of time on this today and unfortunately spoofing the older chipset didn't result in any success. I wasn't expecting this to work but it was worth a try.
Thanks so much for all the help joevt, I've learned a lot from this thread.

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