Post #1539634

@daandemeyer You forgot to mention that this functionality is in particular useful in secure environments, since it allows serial console handling without breaking the secure boot chain, i.e. because sd-stub appends it on its own based on trusted info, we don't have to measure it explicitly, and thus switching to booting via serial doesn't break measurements that shouldn't really be broken. Or in other words: this is not just handy, but load bearing.