[SOLVED] Grub2, moving /boot to separate partition
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Yes but if you run update-grub it will change grub.cfg back plus any changes in distros that you have made. When I install grub2 to a separate partition I make my own grub.cfg and then disable os-prober. One easy way is to copy your grub.cfg from the installed linux distro and paste it in your new /boot/grub partition.
I chainload my partitions so I find it easier to build my own grub.cfg.
No, the code "knows" where it was installed from - based on the parameters passed to (or defaulted) the grub-install.
After doing the grub-install from the "old" configuration you need to update fstab for the new /boot, reboot or remount /boot to sda1, then (re-)run the update-grub. Things should then all be pointing in the correct direction(s).