#asahi-re on 2021-09-21 — irc logs at oftc.irclog.whitequark.org

2021-07-26 22:57 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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03:16 <chadmed> MCM SoCs make sense. jim keller was at apple for a while, and i remember reading that apple wants to revive the Xserve line

03:17 <chadmed> its also just ridiculously good for yields, and with a good interconnect and healthy amount of on-die cache the IO latency problems can be significantly diminished

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03:24 <marcan> I'm pretty sure Apple isn't testing xnu with debugging turned on, because this thing is panicing on what, by all appearances, are bugs

03:24 <marcan> panic(cpu 0 caller 0xfffffe001440cbf4): "ApplePMGR: virtual void ApplePMGR::waitReg32(ApplePMGR::RegMap, UInt32, UInt32, UInt32, UInt32, UInt32):4491 " "waitReg32 1 0xa0 & 0xf0 is 0x8000090f instead of 0xf0 after 192291 ticks die 0\n" @ApplePMGR.cpp:4491

03:25 <marcan> [0xfffffe0013064a64] PMGR: W.4 0x23d280090 (ATC1_USB_AON.pstate + 0x00) = 0x800000ff -> 0x800000ff

03:25 <marcan> [0xfffffe0013064a64] PMGR: W.4 0x23b700448 (ATC1_COMMON.pstate + 0x00) = 0x2300 -> 0x8000230f

03:25 <marcan> [0xfffffe0013064a64] PMGR: W.4 0x23d2800a0 (ATC1_USB.pstate + 0x00) = 0x900 -> 0x8000090f

03:25 <marcan> it's powering up *and resetting* the ATC1_USB_AON/ATC1_COMMON/ATC1_USB trio - but ATC1_USB depends on ATC1_COMMON, and while ATC1_COMMON is in reset, ATC1_USB can't power up (bit 0x800 - parent missing)

03:25 <marcan> then it times out waiting for the pstate change for ATC1_USB (which I guess is only a panic with debugging enabled)

03:26 <marcan> if I clear the reset for ATC1_COMMON it works fine

03:31 <marcan> dammit, damned if I do, damned if I don't

03:31 <marcan> if I don't do HV time accounting, it panics because doing certain things takes "too long"

03:32 <marcan> if I do do HV time accounting, it panics because it thinks the thing is a Threadripper when it divides seconds worth of energy by milliseconds worth of guest time and comes up with like >100W power.

03:32 <marcan> thankfully pmgr-disable-energy-panic is a thing...

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