On Fri, Apr 16, 2021, at 5:30 AM, John Paul Adrian Glaubitz wrote:
> On 4/16/21 1:57 PM, Johannes Brakensiek wrote:
> >
> > On 16 Apr 2021, at 13:54, John Paul Adrian Glaubitz wrote:
> >
> >> But the image is blessed in HFS vocabulary. If you insert such a CD and
> >> press the <Option>
> >> key during boot, the CD will be selectable during boot.
> >
> > Ok, good to know. Then I suppose the Macโs firmware just wonโt detect it if
> > itโs copied to a USB stick?
>
> It could be that the blessing gets lost when putting it onto a USB disk.
>
> I verified that when burnt to a CD, the image will show up in <Option>
> menu with
> an icon (which we can switch to a Debian swirl maybe later). But I
> don't know about
> OpenFirmware at the moment to know how to reproduce this behavior with
> a USB stick.
I vaguely remember having read somewhere that the "boot with option key" on
PowerPC machines does not examine USB disks for bootable partitions. It does
know about Firewire disks, and ATA/SATA disks, but just not USB disks.
The workaround is to boot directly into OpenFirmware (CMD-OPT-O-F) and give it
a boot command tailored for your USB disk. For other options see --
http://www.jacsoft.co.nz/Tech_Notes/Mac_Keys.shtml and the apple tech info
library articles --
https://developer.apple.com/library/archive/navigation/index.html#topic=Technical+Notes§ion=Resource+Types
Hope that helps!
