On Wed, Apr 24, 2019 at 10:32:08PM +0200, Daniel Kiper wrote: > On Sun, Apr 21, 2019 at 03:43:52PM +0200, Thomas Schmitt wrote: > > Hi, > > > > this is about how exactly to solve a diagnosed and worked-around problem. > > > > Guix is one of the few distros which make their installation ISOs by > > help of grub-mkrescue. The EFI boot manager of an old Macbook got stuck > > when such an ISO was presented on USB stick. I.e. it not only did not > > boot the ISO but showed no other EFI partitions either. > > > > A Debian Live 9 ISO does not impose such a problem. > > The same Guix ISO on DVD rather than USB stick works well, too. > > How do you create USB stick from ISO image? Have you tried latest Guix image? >
This applies to all Guix images, including guixsd-install-0.16.0.x86_64-linux.iso, guixsd-install-0.15.0.i686-linux.iso, and current Guix git master. It is created by a grub-mkrescue invocation. See: https://git.savannah.gnu.org/cgit/guix.git/tree/gnu/build/vm.scm Some patches are applied to grub-mkrescue. See those prefixed with “grub” at: https://git.savannah.gnu.org/cgit/guix.git/tree/gnu/packages/patches For completeness, the GRUB package is defined here to use these patches: https://git.savannah.gnu.org/cgit/guix.git/tree/gnu/packages/bootloaders.scm > > The owner of the machine is Florian Pelz (Cc'ed). He characterizes it as: > > MacBook Pro (13-inch, Mid 2010) > > MacOS Yosemite reports: > > Model Name: MacBook Pro > > Model Identifier: MacBookPro7,1 > > Boot ROM Version: MBP71.003F.B00 > > SMC Version (system): 1.62f7 > > Note that more recent Macbooks appear not to be affected (at least an “early 2014” MacBookAir6,2 is not affected). > > The mformat-made image has an MBR partition table entry which claims the > > whole image as partition 1: > > > > Device Boot Start End Sectors Size Id Type > > /mnt/iso/efi.img1 * 0 2879 2880 1.4M 1 FAT12 > > > > If this partition entry is zeroed, then the EFI boot manager works even > > when the USB stick with this modified ISO is plugged in. > > Numbers here and in another email suggest that this is a floppy image. > And floppy images do not have MBR. They have something called boot > sector which is a bit different thing. I have a feeling that simply Macs > tested by you does not like floppy images. If you create regular HDD > images then probably everything will work. > > Daniel I am not very familiar with partitioning. Is any image created by grub-mkrescue a floppy image? Creating a disk image without grub-mkrescue works and boots fine on the USB drive, so do the above ISO images when burned to a DVD, but the goal is that users can dd the ISO to a USB drive and it just works. Regards, Florian _______________________________________________ Grub-devel mailing list Grub-devel@gnu.org https://lists.gnu.org/mailman/listinfo/grub-devel
