marcan changed the topic of #asahi to: Asahi Linux: porting Linux to Apple Silicon macs | General project discussion | GitHub: https://alx.sh/g | Wiki: https://alx.sh/w | Topics: #asahi-dev #asahi-re #asahi-gpu #asahi-offtopic | Keep things on topic | Logs: https://alx.sh/l/asahi
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<marcan>
kettenis: that's how I read it too, but yet the way Linux does writel() is just `dmb oshst` before the write
<marcan>
and in theory writel() is supposed to be safe for exactly that use case
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<bgb>
marcan: for the MacOS 11.2.2 thing, I think we are safe if we do not upgrade, right?
<marcan>
bgb: what, the usb c thing?
<marcan>
I haven't tested it yet but I doubt they broke the serial support?
<marcan>
I can do that in a sec
<bgb>
yes, the usb-c thing
<bgb>
what if they do break it in the vdm level? is it possible?
<marcan>
I mean of course they could remove the feature altogether if they felt like it
<marcan>
but why would they?
<marcan>
this is a completely baseless hypothetical
<bgb>
ok
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<marcan>
heh, my MBA claimed to be charging, with VBUS powered off of an Arduino GPIO output
<marcan>
that seems.... unlikely
<marcan>
oh, it says "not charging" but "power source: power adapter"
<marcan>
that's clearly a lie; possibly a bug
<marcan>
I get the feeling these machines will claim to be "powered" by an adapter supplying only 5V/500mA but not *actually* run off of that...
<marcan>
tested macvdmtool as a host, vdmtool target, etc on the Macbook Air. No change. 11.2.2 is fine.
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<bgb>
good to hear that! btw, maybe apple use this type-c port "as UART" for DFU thing? I know nothing detailed about apple DFU
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<kettenis>
marcan: yes another dmb should be enough to guarantee that the device sees the register write after it sees the earlier memory writes
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<modwizcode>
Theoretically I think that if dmb could even make that gurantee you'd need a full dmb sy, I don't think oshst would be enough either... I'm assuming that luck is what make it enough and that memory ops just complete way too quick or the cache coherance compensates somehow.
<modwizcode>
It's very strange that it's not properly documented though, that seems like the most important guidence to give to people
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<kettenis>
the architecture doesn't really specify what the inner-sharable and outer-sharable domains really consist of
<kettenis>
Linux obviously assumes that the CPUs are all in the inner-sharable domain
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