The (U)EFI Shell has been around one form or another for nearly 15 years. Recenly I looked at Shell startup options and found that the relevant code in the Shell was badly broken and could never have worked. This post details my findings and solutions.
In this blog I discuss problems testing UEFI APIs using QEMU and the UEFI OVMF. In particular I discuss non volatile variables, the QueryVariableInfo runtime service and the changes I have to make to the existing GNU-EFI header files in order to compile a simple application using this runtime service.