First, you should open Debugger Shell view. In Debugger Shell console, you can enter help command to see all supported commands.
Commands for flash programmer are:
fl::blankcheck b test that the flash device is in the blank state
fl::checksum c calculate a checksum
fl::device d define the flash device
fl::diagnose diag dump flash information
fl::disconnect dis close the connection to the target
fl::dump dump dump flash content
fl::erase e erase the flash device
fl::image i define the flash image settings
fl::protect prot protect sectors
fl::secure secu secure/unsecure device
fl::target t define the target configuration settings
fl::verify v verify the flash device
fl::write w write the flash device
Adrian