Boot G5 From USB?

Discussion in 'PowerPC Macs' started by AmazingHenry, May 13, 2017.

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  1. AmazingHenry macrumors 65816

    AmazingHenry

    Joined:
    Jul 6, 2015
    Location:
    Central Michigan
    #1
    Was trying to boot my G5 from a USB flash drive earlier today. Plugged in the flash drive, booted into Open Firmware, and typed this:
    Code:
    boot ud:,\\:tbxi
    Unfortunately I got a prohibited sign.

    This method works perfectly for my Mac mini G4, iBook G4, and iMac G4. However I could never get it working with my G5. Is there a way to boot a G5 from USB?

    Thanks,
    Henry
     
  2. foxlet macrumors 6502

    foxlet

    Joined:
    Aug 5, 2016
    #2
    Usually for booting flash media, it's a better idea to execute BootX directly, such as with
    boot ud:3,\System\Library\CoreServices\BootX
    (assuming ud points to the proper USB device, and the OS X filesystem is on the third partition), but it seems more like you're trying to run a copy of OS X that isn't compatible with that specific platform (maybe it's too old?) or is crashing early on in the kernel loading process.
     
  3. AmazingHenry thread starter macrumors 65816

    AmazingHenry

    Joined:
    Jul 6, 2015
    Location:
    Central Michigan
    #3
    No, I'm running a 10.5.4 Leopard installer on a 2.0GHz DP G5, so it's not incompatible... I'll be sure to try that command soon, however.
     
  4. AmazingHenry thread starter macrumors 65816

    AmazingHenry

    Joined:
    Jul 6, 2015
    Location:
    Central Michigan
    #4
    Sorry that I haven't given you an update lately. :(

    Anyway, I tried your command, @foxlet, but I get the same prohibited sign. Well, I settled for using TDM in the end anyway, so it doesn't matter anymore.
     
  5. MacCubed macrumors 68000

    MacCubed

    Joined:
    Apr 26, 2014
    Location:
    Florida
    #5
    Certain G5's lack the ud alias, and thus, making that command not work. I know the 11,2 G5s work fine booting from USB (through this command and the boot devices menu), but my 7,2 did not work properly. I ended up cloning the install to a 2.5" SATA HDD, and booting off of that. This was the first video I made on my YouTube channel, outlining the process, if anyone is interested.

     
  6. foxlet macrumors 6502

    foxlet

    Joined:
    Aug 5, 2016
    #6
    You can manually reassign the ud alias to a new device, hence the idea to check it. Anyways, in this situation it would be better to use verbose mode in order to get a more useful output.
     
  7. AmazingHenry thread starter macrumors 65816

    AmazingHenry

    Joined:
    Jul 6, 2015
    Location:
    Central Michigan
    #7
    How would I do this?
     
  8. foxlet macrumors 6502

    foxlet

    Joined:
    Aug 5, 2016
    #8
    In the OpenFirmware session, use dev / ls to show all the existing paths for the system, then devalias ud to set ud to the proper path, for example: devalias ud /ht/pci@2/usb@b/disk@1

    Alternatively, you can replace ud with the direct path.
    boot /ht/pci@2/usb@b/disk@1:2,\\:tbxi
     
  9. MrRPI macrumors newbie

    Joined:
    Mar 3, 2018
    #9
    @foxlet I'm so happy that your solution finally worked that when it worked I almost wet myself.

    Thank you @foxlet
     

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