GRUB 2 Menu

 
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Old 11-13-2016
GRUB 2 Menu

The quick & dirty question I have is... What app/script actually loads the Grub 2 menu system? And where is it located?

The longer question is I understand the core.img is loaded onto the first 63 sectors (stage 1.5) and after it loads I starts the stage 2 Grub bootloader which loads the Menu system. I've searched to try & figure this out but all I keep seeing are references to an ambiguous "Grub 2 bootloader"... What is the exact process of transferring the boot process between stage 1.5 and stage 2?

Can someone PLEASE help me with the specifics... at this point finding the answer has kicked in my OCD & it's driving me crazy.... Thanks!!!
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GRUB-REBOOT(8)						  System Administration Utilities					    GRUB-REBOOT(8)

NAME
grub-reboot - set the default boot entry for GRUB, for the next boot only SYNOPSIS
grub-reboot [OPTION] MENU_ENTRY DESCRIPTION
Set the default boot menu entry for GRUB, for the next boot only. -h, --help print this message and exit -V, --version print the version information and exit --boot-directory=DIR expect GRUB images under the directory DIR/grub instead of the /boot/grub directory MENU_ENTRY is a number, a menu item title or a menu item identifier. Please note that menu items in submenus or sub-submenus require speci- fying the submenu components and then the menu item component. The titles should be separated using the greater-than character (>) with no extra spaces. Depending on your shell some characters including > may need escaping. More information about this is available in the GRUB Manual in the section about the 'default' command. REPORTING BUGS
Report bugs to <bug-grub@gnu.org>. SEE ALSO
grub-set-default(8), grub-editenv(1) The full documentation for grub-reboot is maintained as a Texinfo manual. If the info and grub-reboot programs are properly installed at your site, the command info grub-reboot should give you access to the complete manual. grub-reboot (GRUB) 2.02-2ubuntu8.3 July 2018 GRUB-REBOOT(8)