On Fri, Aug 27, 2010 at 1:59 AM, Matevž Markovič <
[email protected]> wrote:

> http://www.firmworks.com/QuickRef.html
>
> Here you can see all open firmware commands (remember, that  is forth
> environment, therefore you can define your own commands from the existing
> ones).
>
> I found that I was wrong about sync - it writes to the hard disk.
> The script I mentioned is NVRAMRC.
>
> nvramrc is also used with the Open Firmware hack used to enable >128GB hard
drives on older Macs. For an example, see here:

http://nanchatte.wordpress.com/2008/04/27/128gb-large-hdd-lba48-support-on-the-g4-cube-with-leopard/

IIRC, there is a command in OS X that can be used to modify Open Firmware
once the OS is booted. I think the command is "nvram", but I'm at work right
now and don't have a PPC Mac handy for testing.

Actually, I got the command right. Here's the man page for the nvram
command. Use with extreme caution!

http://developer.apple.com/mac/library/documentation/Darwin/Reference/ManPages/man8/nvram.8.html

Eric

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