These variables closely mirror the existing LoaderDevicePartUUID/LoaderImageIdentifier variables. But the Stub… variables indicate the location of the stub/UKI (i.e. of systemd-stub), while the Loader… variables indicate the location of the boot loader (i.e. of systemd-boot). (Except of course, there is no boot loader used, in which case both sets point to the stub/UKI, as a special case). This actually matters, as we support that sd-boot runs off the ESP, while a UKI then runs off XBOOTLDR, i.e. two distinct partitions.
System and Service Manager
Details
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