Noob Question on Patching AppleRTC.Kext

[tkenney65]

I am trying to patch AppleRTC.kext to eliminate the CMOS reset issue on my Gigabyte GA-P45-UD3P mobo. I tried it (via Terminal) and the CMOS resets continue. Do I have to modify S/L/E folder permissions or the file permissions to apply the patch? Should the "Modified" date on the kext change after I do this?

 

This is the last thing I need fixed to have my Lion Install work completely and I have been pulling my hair out for 2 weeks over this.

[Gringo Vermelho]

Fix it in DSDT instead, it is much easier and will not be obliterated by Apple system updates.

[Foxic]

yes you will need to either repair permissions and rebuild your caches after patching, or fix via dsdt

[tkenney65]

Here's what i entered in Terminal to apply the patch

 

 

sudo perl -pi -e 's|\x75\x30\x44\x89\xf8|\xeb\x30\x44\x89\xf8|; s|\x75\x3d\x8b\x75\x08|\xeb\x3d\x8b\x75\x08|' /System/Library/Extensions/AppleRTC.kext/Contents/MacOS/AppleRTC

 

Then a ran the kext utility app.

 

Is there any way (other than the CMOS reset issue going away) to confirm what I did worked?

 

Where is the best place to start to attempt this fix via patching via DSDT?

[Foxic]

You can try using dsdt autopatcher or you could start a thread in the dsdt section if there isn't already one for your hardware.

[Gringo Vermelho]

Extract and open your DSDT, use the editor search to find Device (RTC0) then paste it here in code tags, I'll show you how to fix it.

[tkenney65]

I successfully extracted my DSDT but it isn't finding any "RTC0" when I use the search editor? Is that even possible?

[Gringo Vermelho]

Search for Device and you will find it eventually. Maybe it's named RTC...or something else. Asus normally use RTC0.

[tkenney65]

It was under RTC....here is it

 

Device (RTC)
		  {
				Name (_HID, EisaId ("PNP0B00"))
				Name (ATT0, ResourceTemplate ()
				{
					IO (Decode16,
						0x0070,			 // Range Minimum
						0x0070,			 // Range Maximum
						0x00,			   // Alignment
						0x02,			   // Length
						)
					IRQNoFlags ()
						{8}
				})
		  }

Edited December 23, 2011 by Gringo Vermelho
added code tags and closing bracket, be careful!

[Gringo Vermelho]

Normally the fix for the CMOS reset issue is changing the length to 0x02 but yours is already correct.

Try removing the IRQ so it looks like this:

Device (RTC)
		  {
				Name (_HID, EisaId ("PNP0B00"))
				Name (ATT0, ResourceTemplate ()
				{
					IO (Decode16,
						0x0070,			 // Range Minimum
						0x0070,			 // Range Maximum
						0x00,			   // Alignment
						0x02,			   // Length
						)
			    })
		  }

 

Note, don't copy and paste DSDT code from websites, always edit by hand and make sure you don't screw up the formatting. Formatting errors are sometimes not visible to the human eye, these can drive you insane when trying to track them down.

 

While you have your DSDT open you might want to look at this: http://www.projectos...p?showtopic=564

Don't copy his code, edit your own and remove the IRQs as they are in your DSDT, it doesn't matter if they are not the same as his.

Removing IRQs on the devices mentioned will allow OS X to set the IRQs it wants to use.

You can use IORegistryExplorer.app from Apple developer tools to check and compare IRQs before and after.

[tkenney65]

Unfortunately this didn't work either. I appreciate your help though. I should probably take this to the DSDT Forum