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29 aprilie 2015

Boot from usb mac 10.5 on Imac power pc succes

10.5: Install on a PPC Mac from an external USB Drive System 10.5
Leopard only hintAfter doing a lot of research and trying out some hints, finally I could install Mac OS X 10.5 Leopard on an iMac G5 1.8 GHz, and I would like to share with you the solution that I got.

This works for PowerPC Macs that don't have a Dual Layer DVD, and you wish to install Leopard using an external USB Drive instead.

1. Start by creating the disc image of the installation media (this can be DMG, CDR, ISO or any of the disc image formats supported by Mac OS X). In my case I used an external DVD (Dual Layer) drive with the Installation media to make the image -- because the system doesn't recognize that drive in the Startup Manager (when I restart it while holding down Option key), neither was listed at System Preferences » Startup Disk.

Note: you can skip this step and make the restore directly from the DVD -- just dragging the DVD into the Source field -- explained in step 4.

2. Connect your external drive and launch Disk Utility.

3. Select the drive in Disk Utility and then select the Partition tab. Make sure that the drive is formatted using an Apple Partition Map scheme, not GUID or MBR (you may need to reformat your drive to get it in this form).  Once the drive is in the Apple Partition Map scheme.

4. Select the Restore tab of Disc Utility and drag the Disk Image (or the DVD in case you have an external drive) for the Installation Media onto the Source field.

5. Then drag the appropriate partition (in my case, the USB external drive) to the destination field.

6. Click on restore. This may take a while to complete.

7. Determine the partition where your bootable image it situated (e.g. an MacOSX DVD or DMG restored to a partion with Disk utility's restore). This might be disk1s3 in which case the partition number is 3. Also you can check it on Disk Utility, select the hard drive -- right click on it and select 'Information,' and write down the 'Partition Number.'

8. Restart your iMac while holding down Command+Option+O+F. This will place you in Open Firmware.

9. Type dev / ls to get the device tree list.

Look for something in the output like:
/usb@b
/disk@1
As we're talking about a tree here, write down the complete path to this node. In my case it would be:
/ht/pci@2/usb@b/disk@2
10. Type devalias ud /ht/pci@2/usb@b/disk@2. In other words: make 'ud' equal to the path you found in step 9.

11.Now verify you got the right disk:

dir ud:3,\

(3 is the partition number you wrote down in step 7). And look for a file with tbxi attribute, probably in:

\System\Library\CoreServices\BootX, e.g.:

dir ud:3,\System\Library\CoreServices

12.Then boot from it:

boot ud:3,\System\Library\CoreServices\BootX
13. Wait a little bit – while the iMac restarts and if you see the Leopard Installer begin, you're done.

[crarko adds: This was a complex hint to edit, and while I tested some of the Open Firmware commands on an iMac G5, it is possible you will need to adjust some of the items depending on the PPC hardware you're working with. I think all the front slash/back slashes are correctly placed, but if any are misplaced please note this in the comments and I will correct them.]