Over-the-Air Download (OAD)¶
The following sections aim to describe the lower layers of OAD software that
are common across all protocol stack implementations. This includes the OAD
image header, the flash layout, Boot Image Manager (BIM), and the
oad_image_tool.
Warning
The TI-OpenThread OAD module does not implement or perform any security or authentication mechanisms as part of the firmware update process. System developers should take measures to adequately authenticate peer devices and only accept and/or apply firmware images transferred from trusted sources via OAD.
When using the Secure OAD feature along with recommended parameters, firmware images are authenticated on the device using ECDSA signature validation algorithms to ensure image authenticity prior to updating the running firmware image.
Note
The TI-OpenThread does not support on-chip OAD. All references to on-chip OAD in the OAD chapter can be ignored.
The following sections aim to describe the TI-OpenThread specific protocol and application layer of the OAD solution. The native OAD section will describe the TI-OpenThread OAD process from a high level in terms of events and states, as well as providing a detailed description of the actual structures that are sent over the air. The non-native OAD section described how an OAD-enabled TI-OpenThread image can be transported over any other TI wireless stack that supports OAD.