Add web firmware recovery

[greenbreakfast]

Motivation

Why are we doing this? What use cases does it support? What problems does it solve? What is the expected outcome?

Enable ethernet-based firmware recovery from the bootloader. User friendly way to flash new firmware and/or recover devices with bad firmware. Backwards compatible with existing Omega2 bootloader

Description

A clear and concise description of what you want to happen. It should be reasonably clear how the improvement would be implemented.

After #1 and #2 are completed: Update u-boot to support ethernet-based firmware recovery from the bootloader

• See https://docs.onion.io/omega2-docs/Firmware-Flashing-Web-Recovery.html for web firmware recovery flow:
  • Connect computer to Omega2 with Ethernet
  • Set computer IP to 192.168.8.100 and subnet mask to 255.255.255.0
  • Boot device and activate bootloader menu
  • Select Web Recovery from bootloader menu
  • Navigate to 192.168.8.8 in browser on computer
  • In browser, select firmware and upload to device
  • Device flashes new firmware

Additional Resources

Existing implementation in current Omega2 Bootloader: https://github.com/OnionIoT/omega2-bootloader/tree/master/httpd

[greenbreakfast]

Work on web recovery feature has been iceboxed:

Decided to cancel this approach since it’s a non-standard way of doing things and we may have issue upstreaming the change to uboot later on

All progress work available in feature/add-web-recovery branch