If bit 0 is set, SoC has Secure security mode, otherwise Insecure If bit 1 is set, SoC has Production production mode, otherwise Development
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So, to be able to JTAG into device, it has to be Development fused (CPFM 0x01 or 0x00). In other cases, this is what you’ll get:pic.twitter.com/ibGkOcIg68
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Cayman (Apple A10) production devices will connect, but no CPUs will be available to choose (about that later)pic.twitter.com/3GgBSFoOyl
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Skye (Apple A11) will connect and have SEP and ANS2 (some co-processor, I believe) available, but they’re always powered offpic.twitter.com/693Xugku9b
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Perhaps that's because the version of Astris I have incorrectly detects chip revision of both Cayman and Skye targets I've got (iPad 2018 and iPhone X)
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Such CPFM can only be on prototype devices, at least DVT or older. PVT always has CPFM 0x03 (Production + Secure)pic.twitter.com/vOP44b4KI6
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To interact with SWD-cables you need a piece of software called Astris. It’s shipped as part of RestoreTools and HomeDiagnostics, never heard it to be shipped as a standalone package
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You still can install it separately using Pacifist, but in that case you’ll have to launch LaunchDaemons and kernel extensions shipped with it manuallypic.twitter.com/bVuwhMNbQR
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Replying to @nyan_satan
You don’t actually need the kexts/launchdaemons btw, just run astrisprobed.
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Replying to @qwertyoruiopz @nyan_satan
(.. or so said someone in a dream I had earlier tonight. I totally have no idea what JTAG even is officer!)
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Happy to have contributed to this knowledge to become a thing! Soon something new is coming
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