Max Nikulin schrieb:
On a *removable* drive EFI/Boot/bootx64.efi (that is actually
/usr/lib/shim/shimx64.efi.signed that loads grubx64.efi) may allow to
boot without modification of boot entries in NVRAM.
Yes, UEFI can (and must be able) to boot from a device without a boot
entry in the UEFI. Otherwise you wouldn't be able to install an OS.
You can boot such a device by simply selecting the device in the UEFI
boot manager. Often it shows the model number of the device.
Likely it is implementation-dependent whether a drive with GPT
partition table is considered as a removable. For regular (internal)
drives UEFI requires GPT.
MBR should also work.
