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From: | Markus Elfring |
Subject: | [bug #55118] ISO file generation for testing a boot menu |
Date: | Tue, 27 Nov 2018 11:01:35 -0500 (EST) |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:63.0) Gecko/20100101 Firefox/63.0 |
URL: <https://savannah.gnu.org/bugs/?55118> Summary: ISO file generation for testing a boot menu Project: GNU GRUB Submitted by: elfring Submitted on: Tue 27 Nov 2018 05:01:33 PM CET Category: Booting Severity: Major Priority: 5 - Normal Item Group: Feature Request Status: None Privacy: Public Assigned to: None Originator Name: Originator Email: Open/Closed: Open Discussion Lock: Any Release: Release: 2.02 Reproducibility: Every Time Planned Release: None _______________________________________________________ Details: I would like to construct a boot menu (like the following) for the software “GRUB 2.02-35.1”. … menuentry 'GParted 0.32.0-1 (aus der SSHD-Boot-Partition)' --class Debian --class Linux --class ISO { insmod part_msdos insmod ext2 ISO=/ISO/gparted-live-0.32.0-1-amd64.iso search -f --set --no-floppy $ISO loopback xyz $ISO linux (xyz)/syslinux/isolinux.bin boot=live config union=aufs noswap noprompt ip=frommedia findiso=/boot$ISO toram=filesystem.squashfs lang=de keyboard=de } … I saw the message “error: invalid magic number” <https://git.savannah.gnu.org/cgit/grub.git/tree/grub-core/loader/i386/linux.c?id=e8b37e2c8de7570ca9a6c7ba874762d8c4ba9373#n667> after I selected such a boot menu entry. But I determined from the display of a hex editor that the value “0xaa55” <https://en.wikipedia.org/wiki/Master_boot_record#cite_note-NB_Magic_AA55-14> should exist at the expected position in the referenced iso file. * Now I am curious if a corresponding ISO file variant can be created so that such a configuration can be tried out also by the execution of a virtual machine (instead of writing the data to an other physical device before). * Will it help to print a bit of extra information (like bytes from the failed comparison) for easier software debugging? _______________________________________________________ Reply to this item at: <https://savannah.gnu.org/bugs/?55118> _______________________________________________ Message sent via Savannah https://savannah.gnu.org/
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