On Monday, 18 April 2022 at 12:17, Thomas Schmitt wrote: > Hi, > > Dominik 'Rathann' Mierzejewski wrote: > > > > Dell XPS 15 L502X 8GB RAM (BIOS only) > > BIOS-only on a laptop might mean the firmware quirk which demands > to see the "boot/active" flag at some MBR partition table slot. > > See a thread of grub-bug (and later grub-devel) from 2015/16 > https://marc.info/?l=grub-bug&m=145052506901159&w=2 > where Alexander E. Patrakov wrote: > "Subject: [bug #46716] Protective MBR partition is not marked as bootable > [...] > Changing the byte at offset 0x1be to 0x80 in the resulting iso makes > it bootable on such boards." > > This led to the creation of xorrisofs option --mbr-force-bootable in > xorriso-1.4.3. > > Does the following bash hack "repair" the USB stick so that it boots on > the affected machine ? > > echo $'\x80' | dd of=/dev/sdX conv=notrunc bs=1 seek=446 count=1 No, it doesn't. Still getting "Operation System not found". FWIW, I can see the following messages in dmesg when inserting the stick into another machine: [18881.575576] GPT:Primary header thinks Alt. header is not at the end of the disk. [18881.575580] GPT:1334219 != 15974399 [18881.575582] GPT:Alternate GPT header not at the end of the disk. [18881.575583] GPT:1334219 != 15974399 [18881.575584] GPT: Use GNU Parted to correct GPT errors. [18881.575593] sdc: sdc1 sdc2 sdc3 [18881.598493] sd 9:0:0:0: [sdc] Attached SCSI removable disk [18881.943729] ISO 9660 Extensions: Microsoft Joliet Level 3 [18881.945322] ISO 9660 Extensions: Microsoft Joliet Level 3 [18881.946584] ISO 9660 Extensions: RRIP_1991A [...] > xorrisofs option --mbr-force-bootable may be added to the grub-mkrescue > arguments. If we indeed face this bug, then a grub-mrescue ISO with EFI > equipment should not boot on the affected machine, unless this extra > option was given at production time. I'll try the grub2-mkrescue ISO next. Regards, Dominik -- Fedora https://getfedora.org | RPM Fusion http://rpmfusion.org There should be a science of discontent. People need hard times and oppression to develop psychic muscles. -- from "Collected Sayings of Muad'Dib" by the Princess Irulan _______________________________________________ devel mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
