hi, nvram --print-config='boot-device /pci@f4000000/ata-6@d/@0:2,\\:txbi' nvram --update-config boot-device="" nvram --print-config=boot-device reboot
result is another login prompt On Fri, Mar 25, 2022, 12:44 AM John Paul Adrian Glaubitz < glaub...@physik.fu-berlin.de> wrote: > Hello! > > I would like to ask users running Debian on a real PowerMac machine (G3, > G4, G5 etc) > to help me verify a theory on the boot mechanism. In particular, the > question is > whether we can skip setting the boot-device in NVRAM in the grub-installer > script > which causes incompatibilities with the PowerMac emulation in QEMU [1]. > > According to Apple's documentation [2], Open Firmware will automatically > search for > available operating systems, so there is no need to explicitly set the > path to > the boot device. > > To verify this, I set the boot device on my iBook G4 to NULL and checked > whether the > machine would still boot which turns out to be true. However, before I > change the > code in grub-installer, I want to make sure it won't break any other > PowerMacs. > > So, if you would like to help, please try the following. > > As root, run: > > root@ibook-g4:~# nvram --print-config=boot-device > /pci@f4000000/ata-6@d/@0:2,\\:txbi > root@ibook-g4:~# nvram --update-config boot-device="" > root@ibook-g4:~# nvram --print-config=boot-device > root@ibook-g4:~# reboot > > If your machine still comes up after changing "boot-device" to zero, we > know that > it's safe to drop the NVRAM part from the grub-installer script for > PowerMacs. > > This will fix the remaining compatibility with QEMU. > > Thanks, > Adrian > > > [1] https://lists.debian.org/debian-powerpc/2022/03/msg00029.html > > [2] https://opensource.apple.com/source/bless/bless-37/README.BOOTING > > -- > .''`. John Paul Adrian Glaubitz > : :' : Debian Developer - glaub...@debian.org > `. `' Freie Universitaet Berlin - glaub...@physik.fu-berlin.de > `- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913 > >
