Bootloader: Integrate rboot directly as 'bootloader' component

Currently using unpatched upstream rboot, but modified to build without esptool2.
This commit is contained in:
Angus Gratton 2016-03-23 14:59:19 +11:00
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OTA Bootloader (rboot) source module and support files.
Can be used to build an esp-open-rtos compatible rboot bootloader, for use when OTA=1.
It is also possible to use the upstream rboot verbatim, but *ensure that the `RBOOT_BIG_FLASH` option is enabled or images in slots other than 0 won't work correctly.
rboot is an open source bootloader by Richard Burton:
https://github.com/raburton/rboot
See the contents of the 'rboot' directory for more information.