DSDT.aml (Differentiated System Description Table) is a file used to tell OS X how to locate and enable features of your computer mainboard without checking of BIOS. It can be placed at the root of your system hard drive or in /Extra folder which depends on your installation method.

This DSDT is Made for Z77-DS3H works on all Bios Versions!(test on your own risk) The DSDT is 33 Kb large so perfekt for add to AMIBoardInfo module. You can use your own patches if you need. Works 100% under Windows and OS X!

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• DSDTSE is a simple editor for mac, aimed to help you solve your DSDT problems and add common hacks to it. A simple editor for mac, aimed to. Solve your DSDT problems.
• DSDT patching was created with the intention to fix device HPET - High Precision Events Timer. The point is that OS X includes a kext named AppleIntelCPUPowerManagement for power management control (SpeedStep), which - by all means - needs interrupts IRQ 0 and 8. Otherwise it will create a kernel panic.
• Mac users interested in Dsdt editor 1.3 generally download: DSDT Editor0.8Free. The main editor windows allows the user to open a DSL file or extract the DSDT from IOReg. It has some useful resources, like syntax highlighting.
• A Hackintosh with Mac OS X Snow Leopard or Lion installed: DSDT Editor is a Mac app, so you have to install Mac OS X on your Hackintosh beforehand. If your Hackintosh isn't fully set up yet, you can boot Mac OS X with iBoot, Unibeast, or some other temporary solution for now.

It’s possible to tweak Os X system in all sorts of ways by changing lines of code in the DSDT.aml file. Unfortunately, you can’t just open this file in TextEdit. First you must extract your DSDT.aml, convert it to DSDT.dsl, then edit it and recompile it to DSDT.aml. To make it easy there is a GUI application that allows you to do all of this in one editor.

The Differentiated System Description Table is the main table in the ACPI part of a computer's BIOS.

The Advanced Configuration and Power Interface (ACPI) defines a large number of tables that provide the interface between an ACPI-compliant operating system and system firmware. These allow description of system hardware in a platform-independent manner in ACPI Machine Language (AML).

The problem is that OS X has an incomplete ACPI implementation which supports only a subset of DSDT. Modifying the DSDT allows the user to better support their hardware. For example, fixing Time Machine and the UUID 35 error is possible after modifying the DSDT.

To patch your DSDT, you must either use a new table file that someone else has provided, or extract and modify your own. Then tell your bootloader to use the new DSDT file instead of the BIOS. On a few motherboards it is also possible to replace the BIOS with an updated BIOS with a patched DSDT.

[edit]Extracting DSDT from BIOS

One of the simplest ways to extract your DSDT from your BIOS is by using DSDT Editor. Once you have downloaded DSDT Editor, open it and press File --> Extract DSDT. After 2-15 seconds, your DSDT should appear on the screen.

[edit]DSDT Patches

Having a patch for your motherboard is essential to create your own DSDT, if you couldn't find one online. A large collection of patches are available here: DSDT motherboard patches Assuming you followed the steps above to extract the DSDT from your BIOS, now we are going to apply the patch. Navigate to Patch --> Open, and choose the patch that you downloaded for your motherboard. Once the patch window pops up, press Apply. After a few seconds, navigate to IASL --> Compile . Once the window pops up, there may be a few errors. If so, press 'Fix Errors.' Once it's finished, you have your DSDT. Navigate to IASL --> Save AML As... , and save it as DSDT.aml .

[edit]Weblinks

• DSDT simple editor V1.4.3 - EvOsx86
• DSDT editor - El Coniglio
• DSDT Auto-Patcher - MaLd0n
• DSDT Patcher, a tool to fix your DSDT - InsanelyMac
• Iaslme Drag/Drop GUI for decompiler iasl - InsanelyMac
• MaciASL Native ACPI Machine Language IDE for OS X - Sourceforge

[edit] Sources for patched DSDTs

• Cartri from Brazil provides 'Mac Edition' BIOSes for Gigabite P43/P45 motherboards with a patched DSDT.[1]
• List of DSDT patches for the Asus P5E3 Premium (should work for most ASUS P5* motherboards) [2]

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