Remove/replace Gummiboot with GRUB?

Are their any how-tos / wiki on the best way to remove and replace gummiboot with GRUB. This is the closest discussion I could find (the opposite of what I'd like to do):
https://bbs.archlinux.org/viewtopic.php?id=183210
I have Window 7 installed using bios to boot. Cannot change Windows 7 to UEFI to match Arch as Win7 uefi isn't supported on this laptop. (already tried as well)
http://na.alienwarearena.com/forums/thr … -boot-mode
I need boot menu where Arch GPT UEFI and Win7 MBR BIOS can coexist.
Thanks!
Last edited by hydn (2014-10-14 21:22:48)

Grub won't offer you to boot alternatively from UEFI and BIOS. Only the boot manager of your firmware can do that, if it supports it (my ASUS motherboard do) (to access it, I need to press F8 while the machine boot but this depends of your firmware) and you will have to choose the way you want to boot from your UEFI/BIOS. You will then need two bootloaders, one for BIOS, one for UEFI (you can use your Windows 7 bootloader to boot Windows). The reason of this is that is your firmware which decides to put your system in BIOS or UEFI mode and once it has decided in which system your computer should boot, a bootloader can't revert the decision. There are versions of grub for BIOS and for UEFI but there can't exist a single version allowing you to choose between the two systems.
If your firmware allow easily to switch between the two, you could:
1) Partition your hard disk with an MBR (required for BIOS booting Windows 7), mark the Windows partitions bootable and install a standard MBR to the boot sector of your hard disk.
2) Have an EFI partition (type ef00) with a UEFI bootloader (which may be gummiboot or grub, but it will necessarily be UEFI aware only, unable to start Windows 7) configured to boot archlinux.
This way a BIOS boot should boot windows 7 and an UEFI boot should boot archlinux. Now the feasibility of that depends of your motherboard (could you easily switch from UEFI/BIOS, does the firmware accepts to boot an UEFI system from an MBR partition?).
You could also boot archlinux in BIOS mode. You will not loose anything, given the fact that Linux don't currently really use UEFI or Bios once it is booted and both system can then be seen by the same bootloader (for example grub).
Note: to remove gummiboot, simply remove the package. Use efibootmgr (efibootmgr -b xxxx -B, where xxxx is the number shown by efibootmgr) to remove the boot entry. But read what I tell you before, no bootloader except the one of your firmware could allow you to choose between BIOS and UEFI booting.
Last edited by olive (2014-10-15 04:17:19)

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