Questions about the Thunderbolt 3 bus display?

[CrazyPegasus]

To make the Thunderbolt 3 bus display the Thunderbolt device information: Is it necessary to plug in the Thunderbolt device? If the device is not plugged in, the Thunderbolt 3 bus is empty and does not display. In addition, how does the domain-uuid of the Thunderbolt 3 bus come from?

[benbender]

Hey,

no its not needed to have a device connected.
It is shown as soon as the OSX-drivers are correctly loaded (which in turn needs the ACPI-devices, the ICM in the expected state and a matching DROM injected via DeviceProperties).

The UUID is basically random and should generally be unique per system as it is used in TB-based networking between machines which would not work if two, via thunderbolt connected, machines have the same UUID. ATM I ignore this fact basically to not make things even more complicated.

[CrazyPegasus]

The SSDT-4-RVP7Rtd3 of my T580 does not have _PS0: Power State 0 and _PS3: Power State 3 power switch states. Although my Thunderbolt 3 hot swap is normal, the egpu is also normal, just the Thunderbus bus. That is not displayed. I want it to be displayed now. So are _PS0 and _PS3 important? It depends on the _PS used in your Raiden ssdt.

[CrazyPegasus]

Uploading ThinkPad T580 origin.zip…

[benbender]

The thing is that your devices are probably running as simple PCI-devices behind a PCIe-bridge. The connections are handled inside the ICM and not the OSX-driver. Have a look at the init()-method of DSB0 - thats where the ICM is resetted.

[CrazyPegasus]

You mean to put
If (OSDW)
{
ICMD ()
}
Else
{
ICMS ()
}Change to
If (OSDW)
{
ICMS ()
}
Else
{
ICMD ()
} in SSDT-DSB0

[benbender]

That's where the ICM is handled, yes. Real work for OSX is done in ICMD(). But you need the whole, fitting setup (bios, acpi, icm-setup, drom-config) to make it load/work.

PS: Is the T580 like the T480 with only one TB-port and a JHL6240?

[CrazyPegasus]

Yes, P52s, T480s, T580, T480 are all JHL6240 ports

[benbender]

Those would at least need a different DROM and I'm unsure if those machines, without an integrated TB-switch, are (fully) supported by apples drivers at all. It may be needed to have a look at the original ACPI-implementation on those first generation macbookair with only one port. My ACPI-patches are a relative straight port of the implementation of the macbookpro14,1-ACPI for TB-handling, which has two ports and an integrated switch.

[whatnameisit]

Hi. I'm looking at your Thunderbolt 3 implementation in macOS, and I was wondering if I could port it to my HP Elite X2 1012 G2 with one Thunderbolt 3 port, JHL6540.
What I've tried:

• Use OSY's ThunderboltReset: not working.
• Use your bare code with modified device names: not working.
• Use your debugging code to see what happens: Thunderbolt device is not turning on.
• Look at BIOS for Thunderbolt 3 settings: only security level exists; None, User Authorization, and Full.
  I'm guessing more work needs to be done on the ACPI side and DROM.
  May I ask a series of questions?
• What does integerated TB-switch mean?
• Is ThunderboltUtil.sh how you mod DROM? But how do I use it?
• I have about zero knowledge in reverse engineering. I can at least look up ACPI methods to see what it executes. Is this whole getting Thunderbolt 3 to work worth the try?

By the way, I think this needs to be inside _UPC.