Firmware Update

Five lessons from taking an i.MX RT control unit from first boot toward production: the bootloader that hides your SDRAM setup, the flash size nobody measured, writing the flash you execute from, firmware updates as a protocol, and surviving the power cut.

What it takes in firmware to run a daisy chain of devices over Single Pair Ethernet: which port decides that the controller is gone, how a node learns its position, when to store the topology, why the receive interrupt lies, and how to update every device on the chain.