tree 5b8ae74429880bb137d7f771c2c890000e18b89e
parent 07ba28f0584862653010fdaccdae294bd120cfe3
author Fabio Utzig <utzig@apache.org> 1543833428 -0200
committer Fabio Utzig <utzig@utzig.org> 1545915530 -0200

Add boostrapping from slot1 support

This adds a new option that allows copying slot0, from the contents
of slot1, if slot0 is found out to be erased and not validated, and
the contents of slot1 are validated.

This mechanism basically enables a device to "bootstrap" from the
contents of an external flash that has a valid image, given that the
only flashed thing in the internal flash is the bootloader.

Signed-off-by: Fabio Utzig <utzig@apache.org>