fastboot usage: fastboot [ <option> ] <command> commands: update <filename> reflash device from update.zip flashall flash boot + recovery + system flash <partition> [ <filename> ] write a file to a flash partition erase <partition> erase a flash partition format <partition> format a flash partition getvar <variable> display a bootloader variable boot <kernel> [ <ramdisk> ] download and boot kernel flash:raw boot <kernel> [ <ramdisk> ] create bootimage and flash it devices list all connected devices continue continue with autoboot reboot reboot device normally reboot-bootloader reboot device into bootloader help show this help message options: -w erase userdata and cache (and format if supported by partition type) -u do not first erase partition before formatting -s <specific device> specify device serial number or path to device port -l with "devices", lists device paths -p <product> specify product name -c <cmdline> override kernel commandline -i <vendor id> specify a custom USB vendor id -b <base_addr> specify a custom kernel base address -n <page size> specify the nand page size. default: 2048 -S <size>[K|M|G] automatically sparse files greater th an size. 0 to disable
References
http://androidforums.com/threads/list-of-fastboot-command.714676/