$ sigrok-cli -d fx2lafw --time 2s -l 5
sr: libsigrok loglevel set to 5.
sr: backend: Sanity-checking all drivers.
sr: backend: Sanity-checking all input modules.
sr: backend: Sanity-checking all output modules.
srd: libsigrokdecode loglevel set to 5.
sr: hwdriver: Initializing driver 'fx2lafw'.
sr: ezusb: uploading firmware to device on 26.4
sr: ezusb: setting CPU reset mode on...
sr: ezusb: Uploading firmware at /usr/local/Cellar/libsigrok/0.3.0/share/sigrok-firmware/fx2lafw-cwav-usbeesx.fw
sr: ezusb: Uploaded 4096 bytes
sr: ezusb: Uploaded 4024 bytes
sr: ezusb: Firmware upload done
sr: ezusb: setting CPU reset mode off...