tree ba9513e6b90b2305b705c47e0ab37e6f210b86f3
parent 388454880f1313c10cd0a31614c54d234ae2480c
author Marti Bolivar <marti@opensourcefoundries.com> 1513327426 -0500
committer David Brown <davidb@davidb.org> 1517354272 -0700

zephyr: try to mass erase when flashing

It's recommended practice to mass erase the flash chip before
reflashing mcuboot. Add a configuration option for Zephyr which does
this by default on some Zephyr runner backends which can support
this (pyOCD and dfu-util). Additional runners can be added as needed.

Signed-off-by: Marti Bolivar <marti@opensourcefoundries.com>