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<kevans91>
ah, shoot- m1n1's gdbserver is linux-specific at the moment
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<jannau>
sven: have you used trace_dcp.py on a laptop with your epic changes? endpoint 0x2c blows up in handle_reply with an EPICCmd which doesn't look like one
<jannau>
rxbuf/txbuf don't like a dva and rxlen/txlen are random looking large values
<jannau>
otherwise I see a single report/notify with "backlight-calibration-paramters" in it on that endpoint
<jannau>
I'm looking into display brightness control but I have no idea how that's realized
<jannau>
it doesn't appear to be handled on dcpep/iomfb (0x37). All I see there is surface swap immediately followed what appears to be feedback from a brighness change
<jannau>
Any idea what "function-pcc_update = 362:PCCU()" in the disp0 node could be? 362 is the phandle of the backlight node.
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<Jamie[m]>
are there any known usb bugs in old versions of m1n1 that would persist after chainloading a newer versions?
<Jamie[m]>
i'm constantly having EP stalls and UartTimeouts with not quite enough bytes
<Jamie[m]>
and my first stage is 5 months old so i'm grasping at straws trying to find something i can do to make proxyclient reliable lol
<Jamie[m]>
(or does everyone have these problems?)
<jannau>
I don't see how they would persist after chainloading. I have no problems, only time I see UartTimeouts is when something bad has happened on the system, i.e. after a macos panic for example
<Jamie[m]>
yeah okay, that reaffirms my assumption that my host system is just somehow bad at usb
<j`ey>
Jamie[m]: Ive struggled with this at random times.. sometimes it worked fine for days, and then just stopped working for hours
<Jamie[m]>
glad i'm not completely alone in it haha
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<chadmed[m]>
It happened to me while I was playing around with the power monitoring registers in the core clusters if I sent bad floating point instructions to the APs.
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<mps>
ChaosPrincess: also tested kbd backlight patch on m1 mbp (j293) with asahi-wip, works fine
<ChaosPrincess>
cool, thats also what i tested it on, but i applied it to asahi branch
<mps>
fine work, ty
<mps>
even wrote small perl script to dim backlight on timeout
<mps>
as a POC
<ChaosPrincess>
now we just need to have touchbar so it is easier to control on m1 mbp :P
<mps>
now for me missing part is display brightness
<ChaosPrincess>
thats dcp, and not a separate thingy, and in dcp lies madness
<sven>
jannau: no, only tested it with my Mac mini
<sven>
amarioguy: SEP IPC should be backwards compatible since you can’t downgrade its firmware which is shared across all installs
<sven>
and yeah, I can confirm that DCP contains lots of madness
<jannau>
as I wrote above. I currently have no idea how macos controls the brightness. All I see currently in tracing is a surface swap and then callbacks from dcp which look like results of the brightness change
<jannau>
nothing obvious in swap_surface struct which could be the display brightness
<jannau>
still worth to looking closer at the swap_surface struct
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<amarioguy>
sven: alright great to hear
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<amarioguy>
hrm seems like the tracer's choking on [cpu0] [SEPTracer@/arm-io/sep] [boot254] > SendScratchMem: 0071c000
<amarioguy>
takes two positional args when 3 were given (still not exactly the most familiar with the tracer infrastructure, might need to play with it a bit more on my end)
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<amarioguy>
...and i just realized my kernelcache is causing me to get a bunch of page faults without enabling the sep tracer
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<ChaosPrincess>
so, i figured out how nvram works, and have a python-based parser/serializer for the variables. What would be the proper way to expose it in linux, clone efivars filesystem?
<j`ey>
there's an nvmem subsytem, probably that?
<ChaosPrincess>
nvmem is a byte array, while i want to expose key-value
<sven>
it’s inside that nor flash, isn’t it?
<sven>
I‘d probably just write a userspace program tbh
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<amarioguy>
wow i am encountering a lot of pagefaults and exceptions when booting xnu under the m1n1 hypervisor (this is both release and development btw)
<amarioguy>
seems to be an issue with CLPC?
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<sven>
does the kernelcache match the installer macOS?
<jannau>
yeah! I'm doing something that DCP doesn't like and but it doesn't crash. trying to add support for YUV pixelformats and it reports underruns
<sven>
and just to be sure: you are using a full macOS install where you replaced the kernel manually with m1n1, aren’t you?
<amarioguy>
sven: yes to both, i can send a scrollback if you want
<amarioguy>
(12.3.1 is the fw version if that's of help)
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