[Beta] Jump to system memory boot from user application - #710

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fpistm wants to merge 15 commits into

stm32duino:mainfrom

fpistm:jumpSysBL

Commits on Sep 18, 2020

Clean declaration
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Jump to system memory boot from user application
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Add upload.use_1200bps_touch=true
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Do not use the RTC to track a bootloader request

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Override Reset_Handler to jump to bootloader

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Use handcoded delay in USBD_reenumerate

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Clear reset flags before starting bootloader

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Simplify system flash address detection

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Forward declare Original_Reset_handler

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Jump to bootloader from asm block

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Delay autoreset to bootloader

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HACK: Do not use USB_DevDisconnect in early startup

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HACK: Extend HACK to boards with DPPU-based pullup control (e.g. F0)

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[USB] Support DFU runtime protocol along CDC

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Do not build for STM32MP1xx
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