OS-BADGE-ICONS is nominally a very simple format, but unfortunately the sands of time have erased it from the memory of the Web, and the memory of hackers like me who used to understand it.
The header is width x height. "1010" for 16x16 icons. There is an extended format used by OpenBSD which is 32x32, but they only use 27 rows so they have "201B" as the header. I don't recall what the system does with non-square icons; I *believe* it centres them. There are three icon grids; the hex chars are serialised literally. For example, the first line of the typical penguin icon is: 000000000000F8FEACF6000000000000 - this means a bunch of 00 bytes followed by F8, FE, AC, F6 followed by more 00 bytes. The third 'grid' component is an alpha mask. I do remember this. One brain-wave that I just had is that I'm thinking these are Apple ics8 format icons; the first is the normal icon, and the second is the 'selected' icon (since the background changes, you may want the icon to change too). But I may be wrong. This was all many, many years ago. I also want to note that while most of your bootinfo.txt/ofboot.b file has to have capital SGML tags (this predates XML!), because some Mac OF won't accept it if CHRP-BOOT/COMPATIBLE aren't all-caps, you need to ensure "boot-script" is always uncapitalised. This is to ensure compatibility with SLOF, as used in late-model IBM pSeries systems and also QEMU: https://github.com/aik/SLOF/blob/master/slof/fs/packages/disk-label.fs#L472 Otherwise, SLOF will say your boot script is invalid because it couldn't find the string "<boot-script>" in it. The xorriso params that we pass in Adélie to have successfully booting, GRUB 2-based PPC/PPC64 media, are: -hfsplus -isohybrid-apm-hfsplus -hfsplus-file-creator-type chrp tbxi boot/ofboot.b -hfs-bless-by p boot -sysid PPC -chrp-boot-part Our image creation scripts are at https://code.foxkit.us/adelie/image/ - you would probably be interested mostly in iso-params-ppc and post/arch/ppc.sh (which is an arch-specific script that runs after the file system is created but before xorriso is called). Note that you can have a pretty icon in the Finder on Mac OS X by generating a modern .icns file and copying to the root of the disc as 'Icon^M'. Yes, that is an escape sequence, and means Icon\r. I don't know if any of this is even still relevant or helpful, but I hope that this may help out future hackers boot up PowerPC systems. Best, --arw -- A. Wilcox (awilfox) - Unix since '97, Linux since '01 Libre programmer (C/C++) - contracts available Bio: http://foxkit.us/ - Distro: https://www.adelielinux.org/
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