There are two possibilities. If the new package is derived in large part from some existing software then it is likely that there are existing license restrictions that will apply. For example if you create a new eCos device driver by copying an existing one and editing it then this would constitute a modification to existing code and the eCos public license would apply to the new device driver. If you create a new device driver from scratch then you can decide for yourself what license should apply. If you want the package to be freely available to the entire eCos community then we recommend the eCos public license, but the choice is yours.