Generating customized efi.img file from GRUB SOURCE
I have booted my system with Ubuntu 18.04 ISO Image. The system is up and running fine.
Towards changing the GRUB bootloader, I have followed below steps:
Mounted the 18.04 ISO image on the Ubutu system using below command.sudo mount -o loop ubuntu-18.04_Image.iso.iso ~/mount_point
Copied the contents of ISO mount point to local colder “Ubuntu”.sudo cp -rf ~/mount_point ~/ubuntu
Now the contents of the grub folder from ISO image is as below:
-r--r--r-- 1 root root 2523136 Feb 9 23:31 efi.img
-r--r--r-- 1 root root 5004 Feb 8 04:50 font.pf2
-r--r--r-- 1 root root 941 Feb 10 05:57 grub.cfg
-r--r--r-- 1 root root 604 Feb 10 05:57 loopback.cfg
dr-xr-xr-x 1 root root 32768 Feb 9 23:31 x86_64-efi/
I need to modify/customize the grub bootloader.
My goal is to generate efi.img file from the GRUB source code, copy it to ISO image folder i.e) ~/mount_point/ubuntu/boot/grub, create my ISO image and boot the system.
Towards this I have follow below steps Downloaded the GRUB source from “git clone git://
Compiled the GRUB source code as below: ./bootstrap ./configure make
Question 1: After compilation I do not have efi.img file generated. How do I generate efi.img file?
Here, my understanding is that if I can generate efi.img file, copy it back to ISO dump folder ~/ubuntu generate an .iso image, so that my bootloader modifications are visible.
Question 2: Is this my understanding correct?
Any help is highly appreciated.
Regards
Srinivasa
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