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https://issues.apache.org/jira/browse/MYNEWT-484?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15657873#comment-15657873
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David G. Simmons commented on MYNEWT-484:
-----------------------------------------

If Blinky (or another app, as far as I can tell) is running, you can't load a 
bootloader without first either erasing the chip or otherwise crashing mynewt 
so that it is halted. 



> Arduino M0 Pro does not boot
> ----------------------------
>
>                 Key: MYNEWT-484
>                 URL: https://issues.apache.org/jira/browse/MYNEWT-484
>             Project: Mynewt
>          Issue Type: Bug
>          Components: Newt
>    Affects Versions: v1_0_0_beta1
>            Reporter: Sterling Hughes
>            Assignee: William San Filippo
>             Fix For: v1_0_0_beta1
>
>
> Tried loading and running newt on the M0 Pro, and it doesn't work.  Works 
> fine on the Arduino Zero.
> Doesn't work (with M0 Pro): 
> targets/my_blinky_arduino_zero
>     app=apps/blinky
>     bsp=@mynewt_arduino_zero/hw/bsp/arduino_zero
>     build_profile=debug
>     syscfg=BSP_ARDUINO_ZERO_PRO=1
> targets/my_blinky_arduino_zero_boot
>     app=@apache-mynewt-core/apps/boot
>     bsp=@mynewt_arduino_zero/hw/bsp/arduino_zero
>     build_profile=debug
>     syscfg=BSP_ARDUINO_ZERO_PRO=1
> Works (with Arduino Zero): 
> $ newt target show 
> targets/my_blinky_arduino_zero
>     app=apps/blinky
>     bsp=@mynewt_arduino_zero/hw/bsp/arduino_zero
>     build_profile=debug
>     syscfg=BSP_ARDUINO_ZERO=1
> targets/my_blinky_arduino_zero_boot
>     app=@apache-mynewt-core/apps/boot
>     bsp=@mynewt_arduino_zero/hw/bsp/arduino_zero
>     build_profile=debug
>     syscfg=BSP_ARDUINO_ZERO=1



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