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mcuboot
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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>
This commit is contained in:
Marti Bolivar 2017-12-15 03:43:46 -05:00 committed by David Brown
parent 388454880f
commit aefbd46631
1 changed files with 37 additions and 0 deletions
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37
boot/zephyr/CMakeLists.txt
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@ -57,6 +57,24 @@ if (NOT DEFINED CONF_UPGRADE_ONLY)
set(CONF_UPGRADE_ONLY NO)
endif()
# If CONF_ZEPHYR_TRY_MASS_ERASE is set (it is set by default), the
# Zephyr build system configuration attempts to force a mass erase
# before flashing. This ensures the scratch and other partitions are
# in a consistent state.
#
# This is not available for all boards.
#
# To enable the mass erase attempt (this is the default):
#
# cmake -DCONF_ZEPHYR_TRY_MASS_ERASE=YES [...]
#
# To disable the mass erase attempt:
#
# cmake -DCONF_ZEPHYR_TRY_MASS_ERASE=NO [...]
if (NOT DEFINED CONF_ZEPHYR_TRY_MASS_ERASE)
set(CONF_ZEPHYR_TRY_MASS_ERASE YES)
endif()
##############################
# End of configuration blocks.
##############################
@ -119,6 +137,25 @@ endif()
# the boot partition.
set(DTC_OVERLAY_FILE ${CMAKE_CURRENT_LIST_DIR}/dts.overlay)
# Enable Zephyr runner options which request mass erase if so
# configured.
#
# Note that this also disables the default "leave" option when
# targeting STM32 DfuSe devices with dfu-util, making the chip stay in
# the bootloader after flashing.
#
# That's the right thing, because mcuboot has nothing to do since the
# chip was just erased. The next thing the user is going to want to do
# is flash the application. (Developers can reset DfuSE devices
# manually to test mcuboot behavior on an otherwise erased flash
# device.)
macro(app_set_runner_args)
if(CONF_ZEPHYR_TRY_MASS_ERASE)
board_runner_args(dfu-util "--dfuse-modifiers=force:mass-erase")
board_runner_args(pyocd "--flashtool-opt=-ce")
endif()
endmacro()
# Standard Zephyr application boilerplate:
# http://docs.zephyrproject.org/application/application.html
include($ENV{ZEPHYR_BASE}/cmake/app/boilerplate.cmake NO_POLICY_SCOPE)