Mac mini powerpc boot from usb


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Alter as desired. These settings below create a color screen similar to the OS X open firmware colors. On some installations e. Gentoo have an excellent quick guide to manually editing the yaboot. It contains advice on the ofboot argument, as well as, adding a root delay. You can also look at the yaboot. The more wordy Debian guide is here. This gives instructions on how to boot the system from openfirmware. See also the troubleshooting section below for how to use a Ubuntu CD to boot your installed system or manuallly edit your yaboot. The ybin program creates a file ofboot.

This is a simple CHRP script that controls the first stage boot menu. If you require additional options for example to add a boot USB feature , then it is possible to alter the script.

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This is beyond the scope of this FAQ, but it is very easy for anybody with programming experience. Use the ofboot. In your yaboot.

Is Usb boot Supported?

In an ideal world, yes, of course. For many machines it does. However, if you get a blank screen on boot, your boot time is excessively long, or if your picture is not displayed correctly then you will have to make some adjustments. You may also like to experiment with your graphics setup to increase performance or enable a certain feature. Unfortunately, there are quite a few problems with essentially the same symptom - a blank or corrupted screen.

So it is often a case of trial and error to see what works see this troubleshooting question first. There are broadly two approaches to solving graphics problems: adding a yaboot parameter and setting up an xorg. The yaboot parameter could be seen as the "quick fix" approach, good to get something at least on the screen e.

An xorg. Increasingly, an xorg. Note, Ubuntu evolves with every new release and yaboot parameters you may need for one release may not be required for the next release. To take advantage of improvements you should retest your graphics setup after an upgrade.


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  6. To solve graphics problems it helps to know what sort of video card you have. If you don't know what you have, you can look up your computer at Apple or Everymac. Though typing lspci at the terminal prompt should give you the information you need. Framebuffers are used to display things like the text console and splash screen, but they are also crucial in determining if suspend or brightness keys work. Offb is a basic framebuffer with typically a very limited palette and no suspend. You add a yaboot parameter also known as a boot or kernel parameter after whatever you normally type at the yaboot prompt.

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    See this Ubuntu bug report , particularly comment Don't worry yet , keep reading for alternatives. KMS supposedly provides an improved graphical boot with less flickering, a built-in framebuffer console, seamless switching from the console to Xorg, and other features. To achieve this, KMS moves some of the responsibility for selecting and setting up the graphics mode from the Xorg to the kernel. KMS can be problematic so if you have one of these cards then one of the first things you should try is turning off KMS. For nVidia cards use the yaboot parameter nouveau.

    Note the openfirmware framebuffer has a limited colour depth - hence the 'psychedelic' colours you will see. You can increase the colour depth with fbdev by using a different framebuffer such as nouveaufb or the legacy framebuffers nvidiafb or rivafb and creating an xorg.

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    For radeon cards use radeon. Radeon users before Non-KMS support was removed entirely from the radeon xorg driver in The boot parameter 'nomodeset' can be used instead of radeon. To force a nouveau framebuffer mode e. This has been known to solve problems with some nVidia cards and nouveau. Gentoo have more on phantom outputs with nouveau and other suggestions for you to try , see here. See the bottom of this link for an explanation. The official guide suggests a different way, see the bottom of this page.

    Note, you will have to perform extra steps to use these framebuffer in some versions of Ubuntu as they are not always built in to the kernel - see below. It is possible to combine yaboot parameters. For example: Linux radeon. Forcing a mode may fix some splash problems? The yaboot parameter radeon. To check if a framebuffer is built in look at the config files in the boot directory. If no other framebuffer is available at boot time then you may get a frozen or blank screen until the Xorg server starts.

    - Installing Ubuntu on Macintosh PowerPC, no CD-drive, USB boot not working - Ask Ubuntu

    For background information on framebuffers see here , but you'll have to filter out any details relating to grub as PowerPC does not use this. It also gives some information about the command fbset. This allows you to show or change framebuffer settings from the console. You can check if a framebuffer is working by booting into single user mode. A boot parameter that you'll find reading forums is nosplash probably a throw back from when the splash screen was done with usplash rather than plymouth.

    However, if you want to disable the splash screen it is better to use one of the nosplash options on the CD if you can. Press TAB at the yaboot prompt to find these. The only reliable way to disable the splash screen on an installed PowerPC system is to remove the word 'splash' from the yaboot.

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    It is also worth opening the yaboot. Note, yaboot parameters don't always work with the live cds, but you will still be able to install using the alternate or mini cds. However, other parameters may not be copied so this is something you need to check after an install. Add the desired parameter into the quotes, or remove the word splash if you want to disable the splash screen.

    Every parameter inside the quotes should be separated by a space. For example, adding radeon. If you have a distorted picture, a poor resolution, poor colours or can't boot past a command line login then you may need to setup an xorg.


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    6. For a more comprehensive guide have a look here or the xorg. To setup an xorg. Sample xorg. These can sometimes save you reading the documentation, but some of them are not the best setup that's a polite way of putting it! If you still want to use them then download the file using the wget command at the bottom of the appropriate page. Reboot using "sudo reboot". It is not hard though to setup your own xorg. Some instructions for setting up an xorg.

      Then type: sudo Xorg -configure sudo mv xorg.