A few changes are required in FSBL to enable USB boot mode. USB boot mode support increases the footprint of FSBL by approximately 10 KB. Because it is mostly intended to be used during the initial development phase, its support is disabled by default to conserve OCM space. In this section, you will modify the FSBL to enable USB boot mode. Considering the FSBL project is used extensively throughout this tutorial, do not modify the existing FSBL project. Instead, this section makes use of a new FSBL project.