#asahi-re on 2024-11-30 — irc logs at oftc.irclog.whitequark.org

2024-07-16 04:52 ChanServ changed the topic of #asahi-re to: Asahi Linux: porting Linux to Apple Silicon macs | Hardware / boot process / firmware interface reverse engineering | WARNING: this channel (only) may contain binary reverse engineering discussion | RE policy: https://alx.sh/re (MANDATORY READ) | GitHub: https://alx.sh/g | Wiki: https://alx.sh/w | Logs: https://alx.sh/l/asahi-re

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10:36 <yuka> so... I was looking into why the cpu_init crashes on T8132. I found some references in the XNU code, that certain register writes are skipped specifically for T8312 via a board_config setting called NO_CPU_OVRD

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11:48 <yuka> jannau: you might be interested in this, or have an opinion on it?

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11:53 <yuka> here, it's literally only set for the T8132: https://github.com/apple-oss-distributions/xnu/blob/xnu-11215.41.3/pexpert/pexpert/arm64/board_config.h#L181

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11:58 <yuka> I commented out some parts of the cpu_init to find out which ones resulted in a hang, and so far any write to a *_HID register have caused that

12:00 <jannau> yuka: that sounds like skipping init_cpu() is the correct solution (for now). I'd complete OVRD to override. The initial release builds for new SoCs/machines are often weird/buggy. I wouldn't be surprised if this some kind of bug in iboot which locks more than intended

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14:22 <Mary> There is also the NEX powergating part to not execute if I remember correctly

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14:25 <Mary> i did some very small changes to get some UART proxy going around some weeks ago but not much more than that (serial over two macs is a bit painful) https://github.com/marysaka/m1n1/commits/t8132-stuffs/

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14:31 <yuka> Mary: wonderful, that looks promising

14:31 <yuka> did you try booting it without BRINGUP?

14:31 <yuka> I guess we can switch back to #asahi-dev

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