systemd-boot is an easy-to-configure UEFI boot manager. It provides a textual menu to select the boot entry and an editor for the kernel command line.
This fork has mouse support. Original repository - systemd/systemd
meson setup ./builddir --prefix=$(pwd)/installdir
meson install -C ./builddirDuring boot, systemd-boot and the stub loader will output messages like systemd-boot@0x0A and systemd-stub@0x0B,
providing the base of the loaded code.
This location can then be used to attach to a QEMU session (provided it was run with -s).
See debug-sd-boot.sh script in the tools folder which automates this processes.
If the debugger is too slow to attach to examine an early boot code passage,
the call to DEFINE_EFI_MAIN_FUNCTION() can be modified to enable waiting.
As soon as the debugger has control, we can then run set variable wait = 0 or return to continue.
Once the debugger has attached, setting breakpoints will work like usual.