Pentium/Celeron Open Core desktop Guide

[shto]

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[/QUOTE]
Doesn’t work....
R7 240 7MB on About this Mac

 

[Revelsound]

Hi Guys,

could you help me?I like use my G5400 CPU with macOS Big Sur.
Please help me and give EFI folder with G5400 CPU.I read it is possible...

 

[shuhung]

@Gigamaxx
XCPM bootstrap has been changed and patch need to update, by studying AMD patches Mask, find that using Mask as search / replace pattern for XCPM bootstrap is rather simply.

Original 10.13 XCPM bootstrap decoded by PMHeart, byte 1,2,3,6 change periodically while byte 4,5,7,8 never change from 10.13 to 11.3, byte 4,5,6,7,8, should be used as search pattern.

Set find Mask as FFFF00FFFF, where 00 are unknown / any, FF search pattern

Since only need change byte C4 to C6 and find Mask already function as filter, then set replace Mack to FF00000000 as replace pattern should be enough, where FF values should be replaced, 00 remain unchanged

Tested work with Haswell Celeron G1840 / SKL Pentium G4400 + OC 0.6.6, at least work from Mojave10.14.6 to Big Sur 11.3.

 

[osxfr33k]

Will this work for older legacy Intel Core 2 Duo Penryn CPUs or Core 2 Quad? Some example T9xx T8xx T7xx, Q93xx, Q95xx etc. etc.

 

[Gigamaxx]

Will this work for older legacy Intel Core 2 Duo Penryn CPUs or Core 2 Quad? Some example T9xx T8xx T7xx, Q93xx, Q95xx etc. etc.

Not sure you can give it a try.

 

[osxfr33k]

Not sure you can give it a try.

I did but unfortunately it would not boot. I thought my CPU power management was not working when I was on Opencore originally it was stuck at 2558MHZ. I went back to clover and speedstep was normal again then I tired Opencore again disabled the tweaks from the original post and I was able to boot and it seems that CPU power management is now working. This s a Dell Inspiron XPS M1530 Laptop it has a Core 2 Duo T9500 processor. I don't understand how CPUPM can be working without those settings maybe there is some tweaking in the FakeSMC I am unsure. Does CPUPM work out of the box in OpenCore for some CPUs?

 

[Gigamaxx]

I did but unfortunately it would not boot. I thought my CPU power management was not working when I was on Opencore originally it was stuck at 2558MHZ. I went back to clover and speedstep was normal again then I tired Opencore again disabled the tweaks from the original post and I was able to boot and it seems that CPU power management is now working. This s a Dell Inspiron XPS M1530 Laptop it has a Core 2 Duo T9500 processor. I don't understand how CPUPM can be working without those settings maybe there is some tweaking in the FakeSMC I am unsure. Does CPUPM work out of the box in OpenCore for some CPUs?

Yes it works for most of the Core series i3, i5, etc... If they are close to Apple versions of the CPU and matched with a Simbios that uses a similar processor.

Have you looked into the Dortania guide or GitHub for tips on the processor you’re using in open core?

 

[osxfr33k]

Yes it works for most of the Core series i3, i5, etc... If they are close to Apple versions of the CPU and matched with a Simbios that uses a similar processor.

Have you looked into the Dortania guide or GitHub for tips on the processor you’re using in open core?

Yes but its so generic. After reading over the pros/cons of OC versus clover they mentioned P and C states are not supported in Opencore so what is the work around for that because that alone kills any chance of converting from clover to OC for most legacy Bios PCs with older chipsets like the LGA 775 or Gigabyte G41 motherboard using Penryn CPUs.

 

[endera]

hello, can i install bigsur on this system.

Intel 8.Gen Celeron CPU N4100
and
Intel UHD Grafikleri 600, 200-700MHz

??