Fantasy Posted January 9, 2021 Share Posted January 9, 2021 (edited) So, I can see that some people managed to get Big Sur on their optiplex. I was wondering whether the Optiplex 755 (with q9400, 8gb ram, and a gt710) would be able to run it. I found this Github repo by Denskop called Dell-Optiplex-755-Repo, which seems to show support for Big Sur, but all my effort seem to be going into vain, as I can't get it to work. So I just wanted to make sure whether it is possible or not. -Thanks. Edited January 9, 2021 by Fantasy Link to comment Share on other sites More sharing options...
chris1111 Posted January 9, 2021 Share Posted January 9, 2021 (edited) 6 hours ago, Fantasy said: So, I can see that some people managed to get Big Sur on their optiplex. I was wondering whether the Optiplex 755 (with q9400, 8gb ram, and a gt710) would be able to run it. I found this Github repo by Denskop called Dell-Optiplex-755-Repo, which seems to show support for Big Sur, but all my effort seem to be going into vain, as I can't get it to work. So I just wanted to make sure whether it is possible or not. -Thanks. It is possible you have to complete install from another BS Hack or Mac then put the bootable SSD on your Optiplex Latest ( Legacy Open Core or Clover ESP Legacy ) Edited January 9, 2021 by chris1111 Link to comment Share on other sites More sharing options...
Fantasy Posted January 9, 2021 Share Posted January 9, 2021 11 hours ago, chris1111 said: It is possible you have to complete install from another BS Hack or Mac then put the bootable SSD on your Optiplex Latest ( Legacy Open Core or Clover ESP Legacy ) In terms of "BS Hack" would a virtual machine with direct access to the SSD work? and What about the required kexts and smbios, would it just trial and error? Link to comment Share on other sites More sharing options...
chris1111 Posted January 9, 2021 Share Posted January 9, 2021 (edited) 5 minutes ago, Fantasy said: In terms of "BS Hack" would a virtual machine with direct access to the SSD work? and What about the required kexts and smbios, would it just trial and error? Yes Virtual machine works for the SMBIOS iMac 15.1 is good This is the kext you should use Edited January 9, 2021 by chris1111 1 Link to comment Share on other sites More sharing options...
Fantasy Posted January 10, 2021 Share Posted January 10, 2021 52 minutes ago, chris1111 said: Yes Virtual machine works for the SMBIOS iMac 15.1 is good This is the kext you should use Thank you. I'll post my progress. I should use the latest version of each kext right? 1 Link to comment Share on other sites More sharing options...
chris1111 Posted January 10, 2021 Share Posted January 10, 2021 1 minute ago, Fantasy said: Thank you. I'll post my progress. I should use the latest version of each kext right? Right 1 Link to comment Share on other sites More sharing options...
chris1111 Posted January 11, 2021 Share Posted January 11, 2021 (edited) On 1/9/2021 at 7:44 PM, Fantasy said: Thank you. I'll post my progress. I should use the latest version of each kext right? You can find here an automate OC Legacy Installer ➤ OC LegacyDuet for APFS and HFS+ volume Edited January 11, 2021 by chris1111 1 Link to comment Share on other sites More sharing options...
Fantasy Posted January 11, 2021 Share Posted January 11, 2021 I seemed to be stuck here. The APFS driver loads, and then I get a error saying still waiting for root device, which leads to a Kernel Panic. Link to comment Share on other sites More sharing options...
Fantasy Posted January 11, 2021 Share Posted January 11, 2021 (edited) 9 hours ago, chris1111 said: You can find here an automate OC Legacy Installer ➤ OC LegacyDuet for APFS and HFS+ volume I re-created a Legacy Installer, and if I try to boot off of it, the macOS Big Sur Installer panics and the computer reboots. Do I need to change anything after running OC LegacyDuet, like config.plist, or adding a dsdt? Edit: I used ricoc's DSDT (the one provided for High Sierra) with that I managed to get into the installer but I don't have any USB mouse/keyboard function. Edit 2: I tried using the patch applied in opencore install guide, the patch related to IOHIDFamily, however that causes a panic on the installer. So I am back to square 1, no mouse on the Big Sur Installer. Edited January 11, 2021 by Fantasy 1 Link to comment Share on other sites More sharing options...
chris1111 Posted January 11, 2021 Share Posted January 11, 2021 (edited) 58 minutes ago, Fantasy said: I re-created a Legacy Installer, and if I try to boot off of it, the macOS Big Sur Installer panics and the computer reboots. Do I need to change anything after running OC LegacyDuet, like config.plist, or adding a dsdt? Edit: I used ricoc's DSDT (the one provided for High Sierra) with that I managed to get into the installer but I don't have any USB mouse/keyboard function. For USB Try to not use OpenUsbKbDxe.efi Edited January 11, 2021 by chris1111 1 Link to comment Share on other sites More sharing options...
Fantasy Posted January 11, 2021 Share Posted January 11, 2021 8 minutes ago, chris1111 said: For USB Try to not use OpenUsbKbDxe.efi Umm I removed OpenUsbKbDxe.efi, but now the keyboard and mouse won't work on the boot picker screen. So I can't even boot into the installer. Link to comment Share on other sites More sharing options...
chris1111 Posted January 11, 2021 Share Posted January 11, 2021 10 minutes ago, Fantasy said: Umm I removed OpenUsbKbDxe.efi, but now the keyboard and mouse won't work on the boot picker screen. So I can't even boot into the installer. OK I use the same EFI on my Optiplex 790 without changing on LegacyDuet installer I only put my DSDT and everything boot very fast to the Big Sur 11.1 (20C69) Remember you can not Install ; you need a Big Sur already install from another Mac 1 Link to comment Share on other sites More sharing options...
Fantasy Posted January 11, 2021 Share Posted January 11, 2021 8 minutes ago, chris1111 said: OK I use the same EFI on my Optiplex 790 without changing on LegacyDuet installer I only put my DSDT and everything boot very fast to the Big Sur 11.1 (20C69) Remember you can not Install ; you need a Big Sur already install from another Mac Oh yeah true. After spending a day banging my head aganist a Dell, I forgot about that. I'll try tomorrow with a installed drive! Sorry for the trouble. 1 Link to comment Share on other sites More sharing options...
chris1111 Posted January 11, 2021 Share Posted January 11, 2021 Just now, Fantasy said: Oh yeah true. After spending a day banging my head aganist a Dell, I forgot about that. I'll try tomorrow with a installed drive! Sorry for the trouble. Your surprise of the fastest of booting BS when is installed Link to comment Share on other sites More sharing options...
Fantasy Posted January 12, 2021 Share Posted January 12, 2021 14 hours ago, chris1111 said: Your surprise of the fastest of booting BS when is installed Okay, sadly I am not sure what is happening. I put my pre-installed SSD into the Optiplex, and the loading freezes after the APFS driver is initialised, and then shortly after I get the circle with the line with the error Still Waiting for Root Device? Any idea what is happening? If it helps, it seems that while I have set on my dell's bios to Raid Autodetect/AHCI, sometimes I do notice that before the computer gets to the boot menu, it says "Performing Automatic IDE Configuration". By any chance is the Optiplex forcing IDE mode, even though I have selected AHCI and that is what's causing macOS to no longer recognise the SSD after the APFS driver is loaded? Link to comment Share on other sites More sharing options...
chris1111 Posted January 12, 2021 Share Posted January 12, 2021 8 hours ago, Fantasy said: Okay, sadly I am not sure what is happening. I put my pre-installed SSD into the Optiplex, and the loading freezes after the APFS driver is initialised, and then shortly after I get the circle with the line with the error Still Waiting for Root Device? Any idea what is happening? If it helps, it seems that while I have set on my dell's bios to Raid Autodetect/AHCI, sometimes I do notice that before the computer gets to the boot menu, it says "Performing Automatic IDE Configuration". By any chance is the Optiplex forcing IDE mode, even though I have selected AHCI and that is what's causing macOS to no longer recognise the SSD after the APFS driver is loaded? You have to find the way with OpenCore to patch Optiplex 755 CPU I have Optiplex 790 with a sandybrige cpu so this is not an issue for me Link to comment Share on other sites More sharing options...
Fantasy Posted January 12, 2021 Share Posted January 12, 2021 45 minutes ago, chris1111 said: You have to find the way with OpenCore to patch Optiplex 755 CPU I have Optiplex 790 with a sandybrige cpu so this is not an issue for me So I have to patch a q9400 or the way how the mobo + cpu interacts with the OS? Link to comment Share on other sites More sharing options...
chris1111 Posted January 12, 2021 Share Posted January 12, 2021 52 minutes ago, Fantasy said: So I have to patch a q9400 or the way how the mobo + cpu interacts with the OS? See Dortania OpenCore guide Link to comment Share on other sites More sharing options...
Fantasy Posted January 13, 2021 Share Posted January 13, 2021 (edited) I had a look at Dortania's OpenCore guide, from what I read, in order to patch my Intel Core 2 Quad q9400, I needed the telemetrap.kext to emulate SSE 4.2. However, when I put that kext in my OpenCore USB drive, I get a kernel panic. I attached a picture of the verbose before the Kernel Panic. Afterwards I tried rolling back AppleAHCIPort.kext to a version from Catalina, and still no luck. I get the error "still waiting for root device" (which is the same error I get when I don't have the telemetrap.kext. While looking at more threads, I think that maybe its an issue with the SMBios, as the iMac15,1 doesn't have a q9400. Any idea on what is wrong? Edited January 13, 2021 by Fantasy Link to comment Share on other sites More sharing options...
xflier Posted January 30, 2021 Share Posted January 30, 2021 On 1/9/2021 at 6:45 PM, Fantasy said: In terms of "BS Hack" would a virtual machine with direct access to the SSD work? and What about the required kexts and smbios, would it just trial and error? I installed Big Sur in a SSD and added it into my optiplex 755, and installed opencore Legacy and I can boot it up, select from the boot options, and got the login page. However, USB keyboard and mouse don't work on the login page. Keyboard worked during bootup. Googled around but still stuck on the login. Any suggestion would be really appreciated. Thanks! Link to comment Share on other sites More sharing options...
Fantasy Posted January 31, 2021 Share Posted January 31, 2021 6 hours ago, xflier said: I installed Big Sur in a SSD and added it into my optiplex 755, and installed opencore Legacy and I can boot it up, select from the boot options, and got the login page. However, USB keyboard and mouse don't work on the login page. Keyboard worked during bootup. Googled around but still stuck on the login. Any suggestion would be really appreciated. Thanks! May I ask for your Opencore folder. I tried but no matter what I do I keep getting a kernel panic? Link to comment Share on other sites More sharing options...
xflier Posted January 31, 2021 Share Posted January 31, 2021 (edited) 2 hours ago, Fantasy said: May I ask for your Opencore folder. I tried but no matter what I do I keep getting a kernel panic? Here it is for your reference. I used 0.6.5, and wiped out my Serial Number. You need to fill your own Serial # and system uuid. if you need turn on debugging, just enable it in Misc.Debug ( AppleDebug, ApplePanic, and target =67), and NVRAM.boot-arg (add -v, debug, and etc.). I still have keyboard issue on login page. EFI.zip Edited January 31, 2021 by xflier 1 Link to comment Share on other sites More sharing options...
Fantasy Posted January 31, 2021 Share Posted January 31, 2021 (edited) On 1/31/2021 at 4:05 PM, xflier said: Here it is for your reference. I used 0.6.5, and wiped out my Serial Number. You need to fill your own Serial # and system uuid. if you need turn on debugging, just enable it in Misc.Debug ( AppleDebug, ApplePanic, and target =67), and NVRAM.boot-arg (add -v, debug, and etc.). I still have keyboard issue on login page. EFI.zip 9.2 MB · 2 downloads Thanks to you I got my optiplex to actually get to the login screen. But yeah I've spent a good 6h on trying to figure it out, but still no luck. I'll keep trying and hopefully we find a solution. Update (3 February): I believe that the issue may be due to SMBIOS and hence the way USB ports are mapped. So I think that a SSDT would be required for USB to work. However, I am unsure. Edited February 3, 2021 by Fantasy Link to comment Share on other sites More sharing options...
Fantasy Posted February 15, 2021 Share Posted February 15, 2021 I gave up trying to install Big Sur, installed moved to installing Catalina with OpenCore. In my config.plist, I didn't add the DSDT.aml instead I have two SSDT, one for the EC and one for turning EHCx off, because the Dortania OC guide says to not add the DSDT in the actual config file. So my current situation is that I can boot into the Installer for Catalina, mouse and keyboard work, however my SSD isn't detected at all. I have tried using AHCIPortInjector and SATA-Unsupported but still no luck. I have a hunch that it is due to the missing DSDT, however, if I boot with that I get still waiting for root error (even with USBInjectAll). Any clue of what I could do to get the SATA drives recognised? Thank you. EFI.zip Link to comment Share on other sites More sharing options...
xflier Posted May 12, 2021 Share Posted May 12, 2021 (edited) Here is the opencore EDF for 755 (core2Quad cpu) without the mouse and keyboard issue. I used it to upgrade to big sur successfully. However it still has some other issues like reboot/shut down issue. If your cpu is different, you need to recompile the acpi folder. after upgraded with the reboot/shutdown issue, I switch back to clover to boot the big sur. Appreciate if you have any insight regarding how to fix the reboot/shutdown issue. Need to enter your platform info which I entered some dummy values, before boot from it. USB-BIG-SUR-OC-EFI.zip Edited May 12, 2021 by xflier 1 Link to comment Share on other sites More sharing options...
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