Hello all, mostly Kent,

When I run the rumprun_hello app that's included in the CAmkES manifest, I 
encounter the following runtime errors:

[...]
Booting all finished, dropped to user space
simple_get_extended_bootinfo_length@simple.h:608 
simple_get_extended_bootinfo_length not implemented
vka_cspace_alloc@vka.h:149 Unimplemented
vka_alloc_object_at_maybe_dev@object.h:47 Failed to allocate cslot: error -1
init_rumprun@entry.c:306 [Cond failed: res != 0]
        Failed to allocate notification object

This seems related to the simple->extended_bootinfo_len callback not being 
implemented, which causes downstream failures in object allocation (e.g. 
notification object). This issue appears specifically when running 
Rumprun-based apps.

Would appreciate any insights or suggestions on how to resolve or properly set 
up this functionality. Note that i haven't modified any of the code here. Just 
tried to run the existing 'rumprun_hello' application.
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