7D is quite difficult to emulate, because of the dual processor configuration. Will revisit it at some point, alongside with 7D2, 5DS and 5D4, but for now it's on the back burner. Most of the QEMU tests are failing currently on these cameras; only the very basics are working (bootloader and a tiny part of the startup process).
The digic6_dumper branch is fine for QEMU experiments, too.