GBA problems

[chrysn]

PR #89 was auto-closed because it was merged as part of #90 but then some of it was reverted: In particular, some portable-atomic backend needs to be enabled (and we don't have that yet)

Just enabling portable-atomic-unsafe-assume-single-core does not work because it breaks builds for native; some notes are in #89 on how to continue.

CC'ing @Teufelchen1 who opened the original PR.

[chrysn]

Relatedly, tests/ztimer-async directly enables critical-section on portable-atomic. Could that be part of a solution here?

[Teufelchen1]

Could you link that tests/ztimer-async section? I think I misunderstood since I can't find it.

[chrysn]

rust-riot-wrappers/tests/ztimer-async/Cargo.toml

Line 24 in e07288f

portable-atomic = { version = "1.6", default-features = false, features = [ "critical-section" ] }

and the provide_critical_section_1_0 a few lines above.

(On the long run, RIOT's modules should enable all these with the per-board correct settings, but what is in there should AIU work everywhere now, in which case those settings should be enabled more widely)