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22 changes: 21 additions & 1 deletion ssdt-methods/ssdt-easy.md
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Expand Up @@ -22,7 +22,9 @@ Run the `SSDTTime.bat` file as Admin on the target machine and you should see so
What are all these options?:

* `1. FixHPET - Patch out IRQ Conflicts`
* IRQ patching, mainly needed for X79, X99 and laptop users(use option `C` to omit conflicting legacy IRQs)
* IRQ patching, mainly needed for X79, X99 and laptop users
* Use option `C` to omit conflicting legacy IRQs
* Does that mean it doesn't nullify any IRQ from these devices: `IPIC`, `RTC`, and `TIMR`?
* `2. FakeEC - OS-aware Fake EC`
* This is the SSDT-EC, required for Catalina and newer users
* `3. FakeEC Laptop - OS-aware Fake EC - Leaves Existing Untouched`
Expand Down Expand Up @@ -91,3 +93,21 @@ Run `PatchMerge.bat` you will be presented with this screen:
![](../images/ssdt-easy-md/patchmerge.png)

Select option `1. Select config.plist` to begin the process. Once done, your patches will be stored in a `config.plist` inside the Results folder. You will need to verify that copy of your `config.plist` with your existing one, making sure everything is intact and the patches inserted properly. Then copy both the `config.plist` and the SSDTs from the Results folder to your `EFI/OC` and `EFI/OC/ACPI` folders respectively.

---

### Never nullify any IRQ from devices `IPIC`, `RTC`, and `TIMR`.
1. These Devices Are Not Multi-Function
Unlike a complex device that might have multiple IRQs for different functions, these are simple, single-purpose components.

* `TIMR` (Timer): Its entire job is to send a timing signal on IRQ 0. If you nullify IRQ 0, the timer device is effectively disabled from the OS's perspective. It
has no other function.
* `RTC` (Real-Time Clock): Its job is to keep time and send an alarm signal on IRQ 8. If you nullify IRQ 8, you disable its ability to signal the CPU, which is its
primary role for macOS.
* `IPIC` (Interrupt Controller): This is the manager. Nullifying its IRQ (IRQ 2, which is the cascade for all others) is like telling the manager not to listen to
any employees. The entire system fails.

**Is SSDTime able to patch an IRQ to change its properties from Shared to Exclusive?**
If IPIC, RTC, TIMR, HPET are essential and cannot be patched, SSDTime should not offer to nullify them.

Is the device obsolete legacy hardware? (LPT parallel port, UAR/COM serial port, FDC floppy controller) the problem is its existence, it *can* safely be nullified.