I learned about baremetal programming and created a simple pong game.
My linux is on a drive at /dev/sda. I placed the .efi file for pong on a drive at /dev/sdb, then efi/boot/bootx64.efi on this drive
I can access it and play pong by selecting the right boot device (On startup, I press del to enter boot menu. If i select the first drive I boot on grub, then linux. If I select the second drive, it takes me to the pong game)
Now, how can I make grub aware of this boot option, so that I could boot on /dev/sda, see grub, then choose linux or pong?
update-grub do not detect the pong game. (Yet, it detects a windows boot loader on /dev/sdc)