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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<marcan>
amarioguy: I thought LPDDR5 had embedded ECC anyway
<marcan>
and we know the internal caches have ECC (at least MCC does)
<marcan>
"traditional" ECC isn't a thing in embedded like this
<marcan>
it can't be
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<amarioguy>
marcan: hmm fair point, i just felt it worth pointing out since those comments were added in the most recent xnu drop, so there's definitely *something* going on w/ecc
<amarioguy>
thing is iirc that embedded ecc with lpddr5 might be more for the realities of manufacturing lpddr5 vs what most people think of as ecc
<nicolas17>
amarioguy: well any idea what macOS version added it?
<nicolas17>
like what are the macOS versions corresponding to those two XNUs?
<amarioguy>
base one i'm comparing is macOS 14.0 xnu, diffing against the macOS 14.1 xnu drop that dropped/was pushed today
<amarioguy>
nicolas17: i mean they even added an ECC_TESTING macro in osfmk/kern/ecc.h, along with stub code in same dir, ecc_logging.c, so there's something going on there, not necessarily traditional ecc but apple's clearly putting stuff in there
<amarioguy>
i won't say this is going to lead to anything in production, could very well be internal messy stuff that happened to land in the drop, but it's worth at least noting
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<marcan>
it could be to log ECC error rates in general, for stuff like the internal caches or the internal LPDDR5 stuff, who knows
<marcan>
their AMCC driver already has the ability to log ECC errors there
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<sven>
amarioguy: sure, adding the opcodes to the wiki can’t hurt
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