target_type::examine field

This method is used to perform target setup that requires JTAG access. This may be called multiple times. It is called after the scan chain is initially validated, or later after the target is enabled by a JRC. It may also be called during some parts of the reset sequence. For one-time initialization tasks, use target_was_examined() and target_set_examined(). For example, probe the hardware before setting up chip-specific state, and then set that flag so you don't do that again.