#asahi-dev on 2022-06-27 — irc logs at oftc.irclog.whitequark.org

2022-03-22 11:58 ChanServ changed the topic of #asahi-dev to: Asahi Linux: porting Linux to Apple Silicon macs | General development | GitHub: https://alx.sh/g | Wiki: https://alx.sh/w | Logs: https://alx.sh/l/asahi-dev

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02:15 <pcc> hello, I was wondering about something. since macvdmtool knows how to mux UART out of the local end of the debug port, could we teach m1n1 to do the same thing before booting the OS? I think that should allow building a simpler serial cable without the Arduino or PD chip

02:16 <tpw_rules> i think it already knows how to?

02:16 <tpw_rules> https://github.com/AsahiLinux/docs/wiki/m1n1%3AUser-Guide#proxy-mode

02:17 <tpw_rules> it works great under linux at least, never tested it for macos

02:18 <pcc> I think that's for the emulated UART in the hypervisor, not the real one. it won't be compatible with running your OS at EL2

02:18 <tpw_rules> ah, not sure then, sorry

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07:30 <maz> pcc: I don't we know of any control on the AP side to generate mux the uart. AFAIK, this is only controlled externally.

07:30 <maz> s/we//

07:31 <maz> lack of coffee, let me rephrase that: I don't know of any control on the AP side to control the UART mux.

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08:04 <sven> you can talk to that CD321x chip via i2c from the AP and mux out UART

08:04 <sven> macvdmtool does just that. iirc the source code even contains the i2c commands you have to send

08:05 <maz> sven: really? damn. then pcc definitely has a point, and we should really try and do that.

08:06 <_jannau_> marcan said on stream that USB-PD negotiation might reset that, so it would have to be done in m1n1 and linux

08:06 <sven> yeah, i'm not sure how long that mode will survive

08:07 <maz> surely, on something like a mini, this should be a pretty long time.

08:08 <maz> otherwise I'd see some drops, even with an arduino-based hack.

08:08 <sven> https://github.com/AsahiLinux/macvdmtool/blob/main/main.cpp#L318 readRegister just sends a read register command over i2c and command just sends a command to that CD321x chip (https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/usb/typec/tipd/core.c#n288)

08:09 <sven> and macvdmtool first switches the local mux to UART and then instructs that CD321x chip to talk to the remote chip and switch it to UART as well

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08:33 <maz> sven: do we have a way to reconstruct this 'unlock key' in m1n1? it seems to be built from the device name, but *which* name?

08:35 <sven> it's probably somewhere in the ADT

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14:38 <sven> urhg... broadcom... why do they make the device2host queue index configurable but only for one packet type (HCI) but just hardcode it and ignore whatever I configure for another one?! (ACL)

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17:42 <sven> *sigh*

17:43 <sven> at least this probably confirms that Bluetooth is mostly Broadcom. This is too disgusting for apple :D

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18:19 <jannau> marcan: trivial fixup for t8112/bringup https://github.com/jannau/linux/commit/f582405415b0196055b9288896e05ba500d5033b

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18:20 <jannau> and with that linux boots with disabled pcie on my m2 as well

18:22 <j`ey> jannau: can you do some benchmarks at some point? (building the kernel i guess)

18:23 <jannau> dart-t6000 review \o/

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18:28 <j`ey> I saw robin in person a few days ago and prodded him :P

18:28 <jannau> thanks

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18:31 <sven> :D

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18:47 <jannau> j`ey: ~220s for 5.15 defconfig with -j8

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18:54 <jannau> make -j10 is maybe 1% faster

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