User's Manual

SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R18 Advance Information System description
Page 87 of 206
1.13.17 Firmware upgrade Over AT (FOAT)
Overview
This feature allows upgrading the module Firmware over the AT interface of the module (the UART for SARA-G3
modules, the UART or the USB for SARA-U2 modules), using AT Commands.
x The AT+UFWUPD command triggers a reboot followed by the upgrade procedure at specified a baud rate
(see u-blox AT Commands Manual [3] for more details)
x A special boot loader on the module performs firmware installation, security verifications and module reboot
x Firmware authenticity verification is performed via a security signature during the download. The firmware is
then installed, overwriting the current version. In case of power loss during this phase, the boot loader
detects a fault at the next wake-up, and restarts the firmware download from the Xmodem-1k handshake.
After completing the upgrade, the module is reset again and wakes-up in normal boot
FOAT procedure
The application processor must proceed in the following way:
x Send the AT+UFWUPD command through the AT interface, specifying file type and desired baud rate
x Reconfigure serial communication at selected baud rate, with the used protocol
x Send the new FW image via the used protocol
For more details, see the Firmware Update Application Note [28].
1.13.18 In-Band modem (eCall / ERA-GLONASS)
Not supported by SARA-G300 / SARA-G310 / SARA-U260 / SARA-U280 modules.
SARA-G340, SARA-G350 and SARA-U2 modules support an In-Band modem solution for the European eCall
and the Russian ERA-GLONASS emergency call applications over cellular networks, implemented according to
3GPP TS 26.267 [25], BS EN 16062:2011 [33] and ETSI TS 122 101 [34] specifications.
eCall (European) and ERA-GLONASS (Russian) are initiatives to combine mobile communications and satellite
positioning to provide rapid assistance to motorists in the event of a collision. The eCall automated emergency
response system is based on GPS, and the ERA-GLONASS is based on the GLONASS positioning system.
When activated, the in-vehicle systems (IVS) automatically initiate an emergency call carrying both voice and data
(including location data) directly to the nearest Public Safety Answering Point (PSAP) to determine whether
rescue services should be dispatched to the known position.
Figure 36: eCall and ERA-GLONASS automated emergency response systems diagram flow
For more details regarding the In-Band modem solution for the European eCall and the Russian ERA-GLONASS
emergency call applications see the u-blox eCall / ERA-GLONASS Application Note [32].