UPDATE 000: 10.6.8 update went very well. Ran 10.6.8 Combo update, force quit installer. Ran 10.8 Legacy-Kernel installer. Restarted. No Sound -- put back original (rollback) AppleHDA.kext from original install -- all good!
UPDATE 001: It appears that Chimera now supports Intel HD Graphics 3000, and guess what this Dell has for integrated graphics? YUP... I will test this when I find the time, but amazing news - no kext edits, no EFI string - just Graphics Enabler in boot plist.
UPDATE 00: NETWORKING IS PARTIALLY BROKEN. All my NIC cards are giving only 50Kb/sec upload speed with OpenPS2Loader and VNC (FTP & SMB through XBMC on original XBOX is fine). Regular file sharing etc. with a WinXP machine is fine also. I am trying a 64bit only RTL8139 kext with my 8139C -- will report back soon!
8139C shows the same issues, indicating it may be a problem somewhere else in the System.
UPDATE 0: Some people are reporting a DVD spin-up at recurring intervals, which sounds quite distracting. I have posted Needed.zip HERE which contains all the tools I used to install, along with my /Extra folder. It contains the AHCI drivers I mention in the next sentence too! Please edit your Platform.kext with your UUID of your boot volume.
I can vaguely recall installing an AHCI driver from another Snow Leopard release (probably iAtkos s3), all I remember is that is supported the Intel Series 5 chipset. If you look through the kexts included, they have their own '5 series' section. This is probably what that second AppleIntelPIIXATA.kext is... (S/L/E or S/L/E/IOATAFamily). See above for link.
I am free of the disk spin-up issue, and in an attempt to help troubleshoot the situation, I am supplying some data (in screenshots) underneath.

my folders...

Three kexts which might fix SATA DVD spinup issues...
My PlatformUUID.kext -- edit this with your boot-UUID or risk DEATH!
My smbios.kext -- edit this to match your system specs.
Everything I Used!
UPDATE 1: Dual-booting with Windows 7 64-bit working. I needed to install AHCI drivers HERE(forced + silent) and edit the registry values as per HERE. I then needed to set Chameleon to ignore all other disks besides OSX default, and System Reserved - and renamed System Reserved disk to WIN7 in Chameleon PreferencePane.
UPDATE 2: I extracted and installed mach_kernel and System.kext from 10.6.7 Combo Update, ran Kext Utility, and booted with pmVersion=21 -- perfect with Stock 10.7.0 Kernel!!!.
IMPORTANT: GUID is the preferred partitioning method, and gives native HDD speed and full mutitasking/multithreading performance. MRB was tested, and is exactly 50% the speed of GUID, and is also laggy, and ridiculously unusable while multitasking - therefore USE GUID PARTITIONS!
ONLY TESTED ON CORE i3 INSPIRON - THIS *SHOULD* WORK ON OTHER H57 EXPRESS CHIPSETS AS WELL -- BE WARY OF DIFFERING INTEGRATED AUDIO/LAN CHIPSETS!
SEE END OF POST FOR BIOS SETTINGS
I just managed to get a 100% fully working Snow Leopard 10.6.7 install on my Dell Inspiron 580s (2.93GHz Core i3).
After four days of no sleep, and much experimentation, I have a (relatively) foolproof method of installation.







THINGS YOU WILL NEED
Dell Inspiron 580s Core i3 (or Core i5) with Snow Leopard - Chameleon Graphics Enabler compatible ATI/NVIDIA PCIE card.
I would highly recommend upgrading the paltry 300W power supply, especially if you are running multiple HDDs and a decent graphics card. I updated to a Cooler Master 650W model so I could run my GeForce 9800 GT. It is also WAY QUIETER than the stock power supply.
Apple 10.6.7 Combo Update from here
Hazard's 10.6.6i DVD (patched with PPF) - Google is your friend
Edited AppleBCM5701Ethernet.kext.zip from here
MultiBeast from here
BridgeHelper from here
SleepEnabler for 10.6.7 from here
ALL READY? THEN LET'S GO!
Patch and burn Hazard's 10.6.6i to DVD
Place AppleBCM5701Ethernet.kext.zip, BridgeHelper & MultiBeast onto CD/DVD or USB Stick.
Change your BIOS settings to AHCI, Suspend setting=S3, Restart after power failure=On !!!
restart
Change your startup drive to OSX SATA HDD
restart
Hit F12 to select startup drives - insert Hazard's 10.6.6i DVD - wait a few seconds - select CD/DVD - hit enter
When the boot splash arrives, hit F8 - type:
arch=i386 busratio=22 cpus=1 maxmem=2048 "Graphics Mode"="1024x768x32@60"
Quote
if you do not have a 2.93GHz Core i3, your busratio will be different - busratio is the multiplier that is used to get your final processor speed. ie: FSB (133) x busratio (22) = speed (2926 or 2.93GHz)
hit enter - wait 10 minutes until you reach the installer
Select your language, when the main installer window appears, select Disk Utility from the Utilities menu.
Format your NEW SATA HDD as a Single Partition, using GUID.
Install Kernel, Chameleon RC5 with GraphicsEnabler & Restart Fix,
Restart
hit F8 - then type:
arch=i386 busratio=22
Set up Snow Leopard. You should have full QE/CI at this point!
Insert the media you made earlier, and copy BridgeHelper, MultiBeast and AppleBCM5701Ethernet.kext.zip to your Desktop.
Run MultiBeast, and select:
EasyBeast
Realtek 8xx Audio - (deselect all chipsets except 888b)
System Utilities
Restart
Restart
Manually install this Custom Kernel, from an old MultiBeast
Here is my Extra Folder in case it helps you. It contains a simple smbios.plist which got my RAM showing correctly. You may also wish to view my com.apple.Boot.plist.
Here is a PlatformUUID.kext that I am using - don't know if you need this, just edit the UUID value in Info.plist inside to be the same as your boot partition (find it by pressing "i" icon in Disk Utility) and throw it in System/Libray/Extensions, then forget it...
From this point on, you MUST RUN KEXT UTILITY after installing anything into /Sytem/Library/Extensions or /Extra directories! It's in your Applications folder
Copy edited AppleBCM5701Ethernet.kext (unzipped) to /System/Library/Extensions/IONetworkingFamily.kext/Contents/Plugins/ (replacing existing file).
Run Kext Utility
Restart
sudo -s
(enter your password)
cp -R /mach_kernel /mach_beast
chmod -R 644 /mach_beast
chown -R root:wheel /mach_beast
reboot
hit F8 repeatedly when BIOS text disappears - you only have 1 second
type:
mach_beast arch=i386
hit enter
Now, in Terminal
sudo -s
(enter your password)
rm -rf /mach_kernel
ln -s /mach_beast /mach_kernel
exit
(quit Terminal)
Run Apple 10.6.7 Combo Update
Restart
hit F8 repeatedly when BIOS text disappears - you only have 1 second
type:
mach_beast arch=i386
hit enter
Now, in Terminal again
sudo -s
(enter your password)
rm -rf /mach_kernel
ln -s /mach_beast /mach_kernel
nano /Extra/com.apple.Boot.plist
change mach_kernel to mach_beast
hit Control-X
hit Y
nano /Library/Preferences/System\ Preferences/com.apple.Boot.plist
change mach_kernel to mach_beast
hit Control-X
hit Y
exit
(quit Terminal)
STOP PRESS: forgot one VERY important step, install this legacy xnu-kernel, for full 64bit and sleeps support with kernel 10.7.0 --> http://nawcom.com/le...-10.7.0.pkg.zip
STOP PRESS: Also Download the nawcom legacy kernel 10.8.0 here --> (with sleep enabler update included) http://blog.nawcom.com/?p=791
Backup existing IntelHDA.kext (rollback), and the only thing not working after installing 10.8.0 legacy kernel is sound. Install backed up IntelHDA.kext with Kext Utility, restart -- and there you go!
Will try non-DSDT Lion at some point soon....
That is it, you should have perfect 10.6.7 running at full speed, with full Sleep/Restart/Shutdown, all 4 cores running (2 cores x 2 threads -- more on the i5). Core Image and Quartz Extreme, plus all resolutions and refresh rates, All sound inputs/outputs should be functioning, including HDMI/Digital Out. Tested most available software to be working fully. Use -force64 at Chameleon boot screen to try out 64bit OS and apps.
UPDATE: Working PERFECTLY in 64-bit all the time. Updated MacFuse to Tuxera version 2.1.9beta to get FUSE/TrueCrypt working
THINGS NOT WORKING
DVI->HDMI adaptor=Black Screen -
THINGS UNTESTED
nothing - all working except esoteric networking upload issue, and DVI->HDMI adaptors.
BIOS SETTINGS






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