In accordance with RFC 6775, section 5.2 an NCE should be set STALE
when an ARO renews the address registration for the address:
> The routers SHOULD NOT garbage-collect Registered NCEs (see
> Section 3.4), since they need to retain them until the Registration
> Lifetime expires. Similarly, if NUD on the router determines that
> the host is UNREACHABLE (based on the logic in [RFC4861]), the NCE
> SHOULD NOT be deleted but rather retained until the Registration
> Lifetime expires. A renewed ARO should mark the cache entry as
> STALE. Thus, for 6LoWPAN routers, the Neighbor Cache doesn't behave
> like a cache. Instead, it behaves as a registry of all the host
> addresses that are attached to the router.
Callbacks from evtimer are still executed in interrupt context.
While xtimer warns about this, evtimer leaves the user unsuspecting.
Copy the warning from xtimer to keep users vigilant.
The waspmote-pro cannot run at 250 kHz, as no available divider can divide
its core frequency down to that. Instead, the board can be tested at its
core clock frequency.
- Set XTIMER_HZ to something that is actually possible to generate with one
of the available clock dividers from the core frequency
- Use xtimer_on_ztimer if xtimer is used and not ztimer_xtimer_compat is used
- This is needed because xtimer is simply not compatible with any of the
possible clock frequencies of this board
This modifies the cortex-m thread specifics to allow running the PendSV
interrupt continuously at lower priority and removes the priority
modifications during the interrupt itself. Interrupts are disabled
during the scheduling itself, but enabled briefly after the sleep to
ensure that they are handled if activated during the scheduling or the
sleep.
Most timers are implemented this way already, and keeping (documenting)
it that way allows the generic timer_set implementation to stay as
simple as it is.
Kconfig.dep depends on FORCE, so it is always generated when compiling
with Kconfig under normal conditions. Whan TEST_KCONFIG=1 is set, this
file is no longer a dependency for out.config. So when cleaning the
'bin' directory, out.config has no direct dependencies that force its
rebuilding (the generated directory is order only). This causes the file
not to be produced when calling `TEST_KCONFIG=1 make clean all`.
This PR changes the dependency on the 'generated' directory to a direct
dependency when `CLEAN` is set and leaves it as order-only when not.
This allows to generate out.config only when needed by not depending on
FORCE.
This replaces the printf statement in the timer callback with fmt-based
printing and a single puts. This is less heavy on the stack usage than
printf, making this test a bit easier to digest on the smaller
platforms.
Verified that each warning generated by -Wcast-align is indeed a false positive
and used an (intermediate) cast to `uintptr_t` to silence the warnings.
container_of() is safe to use in regard to alignment requirements, when used
correctly. Using `uintptr_t` instead of `char *` for applying the offset results
in -Wcast-align not complaining.
