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https://issues.apache.org/jira/browse/MYNEWT-618?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Marko Kiiskila resolved MYNEWT-618.
-----------------------------------
    Resolution: Fixed

hal_bsp_init() was getting called, so console uart device was not getting 
created.
Also, watchdog was resetting the core. Once app boots, it starts it, and system 
reset does not stop it. So now we're also tickling HAL watchdog from bootloader 
serial.

> boot_serial not working
> -----------------------
>
>                 Key: MYNEWT-618
>                 URL: https://issues.apache.org/jira/browse/MYNEWT-618
>             Project: Mynewt
>          Issue Type: Bug
>    Affects Versions: v1_0_0_beta2
>         Environment: nrf52dk while testing 1.0.0.-beta2 candidate
>            Reporter: Marko Kiiskila
>            Assignee: Marko Kiiskila
>            Priority: Critical
>             Fix For: v1_0_0_beta2
>
>
> System does not come up right when building boot loader with serial upload 
> support in it.



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