OSX-KVM - March 2021 - Batch Update 1

Changes:

- Upgrade to OpenCore 0.6.7-RELEASE

- Big Sur image building script updates (Nick)
  - See https://github.com/kholia/OSX-KVM/pull/169 for details.

- Removed history to reduce repository size

OVMF-notes.txt

@@ -0,0 +1,30 @@
+Current OVMF blobs are borrowed from the following URL,
+
+http://download.proxmox.com/debian/dists/buster/pve-no-subscription/binary-amd64/pve-edk2-firmware_2.20200531-1_all.deb
+
+OVMF for non-OpenCore boot loaders: https://github.com/kholia/edk2/tree/macOS-NG-v3.
+
+Building OVMF
+-------------
+
+# Add tools and build dependencies:
+apt-get update
+apt-get install build-essential git lintian debhelper iasl nasm \
+  python uuid-dev -y
+
+
+git clone https://github.com/tianocore/edk2
+cd edk2
+git submodule update --init
+make -C BaseTools
+. edksetup.sh BaseTools
+build -a X64 -t GCC5 -p OvmfPkg/OvmfPkgX64.dsc -b RELEASE
+
+References
+----------
+
+* https://www.contrib.andrew.cmu.edu/~somlo/OSXKVM/
+
+* https://www.nicksherlock.com/2018/04/patch-ovmf-to-support-macos-in-proxmox-5-1/
+
+* https://github.com/thenickdude/edk2 (macos-support branch)