SL on 64 and Boot.plist

Discussion in 'macOS' started by CPPMaster, Sep 1, 2009.

  1. CPPMaster macrumors member

    Jun 12, 2009
    In order to have the SL boot on 64 by default:

    Edit the file /Library/Preferences/SystemConfiguration/ and add arch=x86_64 to the Kernel Flags string. I can not modify this file because the Admin account has only "read only" privileges. Any UNIX guy, please, can jump in, and send me the command to modify the file attributes.

  2. sleidy macrumors newbie

    Nov 21, 2009
    modify boot.plist

    I am no Unix guy to say the least but the way I was able to modify the boot.plist file was to "get info" of the System Configuration folder that the boot.plist file is located it. On the bottom right corner is a lock, click on the lock, enter your password, modify the permissions, go to the boot.plist file, do the same with that file (get info, unlock with password, modify permissions, save).

    At that point you can either leave it that way or reset all the permissions to where they were and reboot.

    I may be too late for this thread but maybe this will help others.

    Good luck.
  3. J the Ninja macrumors 68000

    Jul 14, 2008
    cd /Library/Preferences/SystemConfiguration
    sudo nano Boot.plist

    nano is pretty easy to use. Just add arch=x86_64 in between the <string. and </string> tags, then hit <cntl>+O to write it to disk, then <cntl>+X to exit nano. Then to restart with K64 (might as well finish the job UNIX style)

    sudo shutdown -r now
  4. dukebound85 macrumors P6


    Jul 17, 2005
    5045 feet above sea level
    copy to desktop

    change flag

    replace in the directory where boot.plist resides
  5. weckart macrumors 601

    Nov 7, 2004
    Setting the kernel flag as suggested will work, but strictly speaking you are changing the architecture rather than switching on a functionality in the kernel, so for the purist this is the way to go:

    type sudo nano /Library/Preferences/SystemConfiguration/

    add <key>arch</key>
    add <string>x86_64</string>

    type Ctrl+o
    type Ctrl+x

  6. Lordedmond macrumors regular

    Oct 24, 2008
    Tilchestune UK
    why mess with the plist

    why not modify the nvram itself

    sudo nvram boot-args="arch=x86_64"

    enter password


    if is fails or you need to revert just reset PRAM

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