Imac 266 booting sequence

I have an imac 266 with 160 MByte of memory, 20GB disk with 10.4.2 and the firmware 3.0 f3.
Each time I boot, I enter in the openfirmware prompt.
with printenv I can see the value of the nvram variable boot-command equal to "0 bootr".
When I reset the firmware default with reset-nvram, I have for the value of boot-command : "mac-boot", it's the right value to boot to mac osx 10.4.2.
Now if I enter the command reset-all the imac boots normaly and I have the 10.4.2 desktop.
OK. Just fine.
If I restart the computer, I enter in the openfirmware prompt and the nvram variable boot-command has a value of "0 bootr".
It seems that somwhere in mac osx a conditional path go to a command writing the nvram with a bad value for the variable boot-command.
Can anyone help me ?
Thanks
Pierre Breuer

The 266 MHz IMacs are incompatible with Mac OSX 10.4.2 you are maybe right, but Mac OSX 10.4.2 runs perfectly on this old timer.
I have also other Mac Computers (macmini, powerbook titanium, imac 400MHz etc ..) and many others computers (sun, PC etc.) and this one is for the fun.
In 1980 I ran unix on a computer with a 8" floppy as swap partition and since this time I have learned that unix is very flexible and programable
I plan to upgrade the memory to 512 MBytes, I have upgraded my disk with a old 20GB 7200 rpm
The 266 MHz is a good configuration for browsing the web and have my email ( and I repeat it works very well for that).
I have just the little problem with the boot sequence and I am shure It may be solved.
best regards
Pierre

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