Recently we have added a new feature to support USB keyboard input console for SBL Shell. It allows user to interact with SBL Shell using USB keyboard as console input device besides the serial port console input device. By default this feature is disabled for boot performance consideration. It can be enabled following the description mentioned in the commit message (commit id: bd1ea24cc1390224e11c6db839b225acc4ef0ee9). Please let us know if you have any question or suggestion. Thanks Maurice