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Building EDK2 based firmware for MinnowBoard
There are some options to build firmware for MinnowBoard, a Bay Trail based SBC (Single Board Computer) from Intel. We prefer usually coreboot as simplest and fastest, open source solution, but sometimes we want to have UEFI interface.
UEFI itself doesn’t cover whole boot procedure, so its open source reference implementation, EDK2 is not enough to build firmware for hardware plafrorm, we need to provide PI (Platform Initialization) phase implementation. In EDK2 repository we can find only implementation for virtualization (OVMF), this option is covered in this article.
coreboot could be used to provide PI phase, but this procedure is mostly covered in article on building coreboot for MinnowBoard, only we need to choose Tianocore payload. In this article we cover building UEFI firmware using binary objects from Intel. Whole procedure can be done using following script:
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in edk2-platforms repository we find open-source part of PI for various platforms including MinnowBoard. However we need also some closed code from Intel’s site, which contains IP (Intellectual Property). Finally we have to fetch OpenSSL, which is another dependency.
When all those components are ready, we can build. We use dedicated docker
images to avoid toolchain compatibility problems. So running docker we mount
edk2 (main repository), edk2-platforms and cache directory to respective
mount points in the image (build script assume that they are all located in the
same directory). So we enter edk2-platforms/Vlv2TbltDevicePkg/ and run
source Build_IFWI.sh MNW2 Debug (for DEBUG version). If build is successfully
complete, we can find the image in
edk2-platforms/Vlv2TbltDevicePkg/Stitch/MNW2MAX_X64_D_0097_01_GCC.bin.
