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Added T2 and iPad data #2

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@rickmark rickmark commented Aug 6, 2021

This tool already works out of box with iPad and T2 targets since the VDMs are identical

marcan
marcan reviewed Aug 12, 2021
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README.md

Thanks to t8012.dev and mrarm for assistance with the VDM and Ace2 host interface commands.

The documentation of the ACE and its USB-PD VPDs is here https://blog.t8012.dev/ace-part-1/
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@marcan marcan Aug 12, 2021

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VDPs?

README.md
Connect the two devices via their DFU ports. That's the furthest left port on M1 MacBooks, the closest left port on the T2, and the only port on the iPad. See Apple's DFU recovery support articles to identify these ports on other models.

You need to use a *USB 3.0 compatible* (SuperSpeed) Type C cable. USB 2.0-only cables, including most cables meant for charging, will not work, as they do not have the required pins. Thunderbolt cables work too.
You need to use a *USB 3.0 compatible* (SuperSpeed) Type C cable. USB 2.0-only cables, including most cables meant for charging, will not work, as they do not have the required pins (USB CC1/CC2 where USB-PD are transmitted). Thunderbolt cables work too.
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This is not correct; the missing pins are SBU1/SBU2, which we use for serial. USB 2.0 cables do work for USB-PD commands like reboot, just not for serial.

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@rickmark rickmark Dec 24, 2023

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Honestly its missing both... but neither here nor there (it only ends up connecting D+/D- SS1/2 and VCC / GND on a 2.0 cable)

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@marcan marcan Sep 5, 2025 •
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No, a 2.0 cable will have a CC line. A cable without a CC line connected is nonconformant and a lot of things would break with it, including direction and orientation and PD negotiation. I think you're confusing CC with "SS" (not sure what that is, either SBU or SSTX/SSRX?)

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tihmstar commented Jan 18, 2023

Hi @marcan @rickmark,
I could successfully use this tool from my M1 mac to do: reboot, dfu and serial on my iPad8,1.
On T2 i could do: reboot and dfu, but serial doesn't work.

sudo macvdmtool serial
Mac type: J316cAP
Looking for HPM devices...
Found: IOService:/AppleARMPE/arm-io/AppleT600xIO/i2c0@9B040000/AppleS5L8940XI2CController/hpmBusManager@6B/AppleHPMBusController/hpm0/AppleHPMARMI2C
Connection: Source
Status: APP 
Unlocking... OK
Entering DBMa mode... Status: DBMa
Putting target into serial mode... VDM failed (reply: 0x05ac8092)
Exiting DBMa mode... OK
VDM failed

Any ideas?

On the same machine i can get serial from my iPad8,1.
Is it possible that serial VDM, is incorrect for T2?
How can the correct VMD be found?

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rickmark commented Sep 5, 2025

Hi @marcan @rickmark, I could successfully use this tool from my M1 mac to do: reboot, dfu and serial on my iPad8,1. On T2 i could do: reboot and dfu, but serial doesn't work.

sudo macvdmtool serial
Mac type: J316cAP
Looking for HPM devices...
Found: IOService:/AppleARMPE/arm-io/AppleT600xIO/i2c0@9B040000/AppleS5L8940XI2CController/hpmBusManager@6B/AppleHPMBusController/hpm0/AppleHPMARMI2C
Connection: Source
Status: APP 
Unlocking... OK
Entering DBMa mode... Status: DBMa
Putting target into serial mode... VDM failed (reply: 0x05ac8092)
Exiting DBMa mode... OK
VDM failed

Any ideas?

On the same machine i can get serial from my iPad8,1. Is it possible that serial VDM, is incorrect for T2? How can the correct VMD be found?

Serial only works if enabled by checkm8 / checkra1n - you'd have to reboot to DFU, then enable serial via the broken boot chain

VinDuv and others added 2 commits September 4, 2025 22:53
@VinDuv @rickmark
README: Update for Monterey and new MBPs
4b86524 
- Indicate how to get the serial device on Monterey
- Document the location of the debug port on 14"/16" MBPs

Signed-off-by: Vincent Duvert <vincent@duvert.net>
Signed-off-by: Rick Mark <rickmark@outlook.com>
@rickmark
Ignore output intermediates
810edd2
@graphine27
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graphine27 commented Nov 12, 2025

Hi @rickmark , how can serial be enabled on T2? I see no option in checkra1n and PongoOS only has a pinmux for ATV4K.

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@rickmark @tihmstar @graphine27 @marcan @VinDuv