Hooks are the functions that can be defined by you. FSBL provides blank functions and executes them from certain strategic locations. The following table shows the currently available hooks.
| Hook Purpose/Location | Hook Function Name |
|---|---|
| Before PL bitstream loading | XFsbl_HookBeforeBSDownload() |
| After PL bitstream loading | XFsbl_HookAfterBSDownload() |
| Before (the first) Handoff (to any application) | XFsbl_HookBeforeHandoff() |
| Before fallback | XFsbl_HookBeforeFallback() |
| To add more initialization code, in addition to that in psu_init or to replace psu_init with custom initialization | XFsbl_HookPsuInit(() |
See FSBL wiki page for more information on FSBL.