#asahi-re on 2021-09-20 — 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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16:56 <marcan> omfg

16:57 <marcan> so if you turn on XNU debugging and pass pmgr-debug=0x8001... it dumps *everything*

16:57 <alyssa> 😁

16:57 <alyssa> register names? bitfields? enums?

16:58 <marcan> https://mrcn.st/p/44xr8mcE all the devs

16:58 <marcan> it panics after that due to a timeout, but I'm sure I can fix that

16:59 <alyssa> holy shit nice

16:59 <marcan> [Die 0] is ominous

16:59 <alyssa> how did you find that ooi?

16:59 <marcan> multidie apple silicon coming up

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16:59 <marcan> I was stringsing pmgr and stumbled upon that string...

16:59 <marcan> then ghidra to figure out exactly how to make it work

17:00 <alyssa> ApplePMGR: DISP0_GP0 | ID = 0x07 | PERF = PMGR + 0x00034630

17:00 <alyssa> ApplePMGR: DISP0_PPP | ID = 0x09 | PERF = PMGR + 0x00034650

17:00 <alyssa> ApplePMGR: DISP0_GP1 | ID = 0x08 | PERF = PMGR + 0x00034640

17:00 <alyssa> ApplePMGR: DISP0_CPU | ID = 0x22 | PERF = PMGR + 0x00034620

17:00 <alyssa> ApplePMGR: DISP0_BLC | ID = 0x23 | PERF = PMGR + 0x00034660

17:00 <alyssa> ApplePMGR: DISP0_BRC | ID = 0x2a | PERF = PMGR + 0x00034670

17:00 <alyssa> those do be acronyms ....

17:00 <alyssa> (I guess DISP0_CPU is the DCP)

17:00 <marcan> https://mrcn.st/p/M3nxXZZf

17:00 <marcan> see I'd been writing dump_pmgr.py all this time :p

17:00 <marcan> and it turns out it'd do it for me :p

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17:01 <alyssa> giggle

17:04 <marcan> it does kind of sound like they intend to glue two SoCs together into one or something like that, judging by this multidie business

17:04 <marcan> NUMA M2? :p

17:16 <roxfan> DEBUG_USB/DEBUG_AUTH hmm

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