How to Fix OpenCore Stuck at Kernel Collection Memory Map on Dell Latitude 7490

How to Resolve [EB.LD.LKC|R.1] Boot Stalls on Dell Latitude Laptops

During the boot process on a Dell Latitude 7490 (Intel Core i5-8250U), the system can halt at the line [EB.LD.LKC|R.1] Kernel Collection. This behaviour indicates that the bootloader is unable to pass the memory map table to the kernel due to locked memory blocks or incorrect UEFI Quirks in the config.plist.

1. Prerequisites

• Hardware Specs: Dell Latitude 7490, Intel Core i5-8250U (Kaby Lake Refresh), Intel UHD 620 Graphics.
• Required Tools: ProperTree, MountEFI.

2. Compatibility Snapshot

• System compatibility: Fully compatible with macOS Ventura and Sequoia, but requires memory mapping configurations to be explicitly matched to Dell firmware.

3. Installation Preparation

1. BIOS Configurations: Ensure Secure Boot is Disabled. Intel SGX must be Disabled, and SATA Operation set to AHCI.
2. Update OpenCore: Ensure you are using the latest version of OpenCore.

4. EFI and config.plist Review

1. Verify Booter Quirks: Open your config.plist using ProperTree. Navigate to Booter -> Quirks and configure the following:
   • DevirtualiseMmio: Set to True (critical for Dell 8th-Gen firmware).
   • RebuildAppleMemoryMap: Set to True.
   • SetupVirtualMap: Set to True.
2. Disable CFG Lock Quirk: If CFG Lock is enabled in the BIOS (or cannot be disabled), ensure AppleCpuPmCfgLock and AppleXcpmCfgLock are set to True under Kernel -> Quirks.
3. SecureBootModel: Under Misc -> Security, set SecureBootModel to Disabled.

5. Post-Installation

1. USB Port Map: Generate a port map to ensure USB-C and internal devices do not cause power panics.

6. Troubleshooting

Reported Issue: Freeze at EB.LD.LKC

1. Verify SSDT-PLUG: A missing or poorly compiled SSDT-PLUG.aml can cause power management initialization to fail. Check that your ACPI tables match the Dortania guide specifications.
2. Clean Snapshot: Run a Clean Snapshot (Cmd/Ctrl + Shift + R) in ProperTree to ensure all ACPI files and kexts are ordered correctly in your config.plist.

7. Dual Boot and Advanced Configuration

• Dual booting on Dell laptops works well. Ensure the UEFI boot entries are configured to prioritize OpenCore.

8. Verification, Maintenance and Rollback

• Verify Fix: Boot the laptop and confirm that the verbose log progresses past the Kernel Collection load screen.

9. References and Glossary

• Kernel Collection: The bundle of macOS system drivers loaded by the bootloader during early boot.