GRUB2 Booting Notes

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Booting Linux with grub is now possible. (But UEFI shell is normally used)

Starting from Linux Kernel 5.0, it is now possible to enable FrameBuffer. This can be configured in grub with

grub_cfg
set grub_mm_debug=1
insmod efi_gop
insmod efi_uga
earlycon=efifb,mem

More here - https://forum.xda-developers.com/windows-8-rt/rt-development/wip-secure-boot-linux-surface-rt-t3653848/page13arrow-up-right

EFISTUB (Kernel booting)

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As we are "stuck" inside Microsofts bootarm.efi -> ContextSwitcher -> grub.

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