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The Emcraft STM32MP1 Starter Kit supports several boot devices. Selection of a specific boot device is defined by the state of the jumpers on the JP10 header of STM32MP1-BSB and switches on the SOM-BSB development board, as described in the following sections.

1. Selecting Boot Device on STM32MP1-BSB

Selection of a specific boot device is defined by the state of the switches on the STM32MP1-BSB development board, as follows:

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State ON means presence of a jumper on the corresponding pin of the JP10 header; state OFF means absence of a jumper.

2. Selecting Boot Device on SOM-BSB

Selection of a specific boot device is defined by the state of the switches on the SOM-BSB development board, as follows:

SW4.2

SW4.3

SW4.4

Boot from SD Card

-

OFF

ON

Boot from on-module eMMC

-

ON

OFF

Boot from USB Serial Downloader

-

OFF

OFF

Boot in Debug engineering mode

OFF

ON

ON

2.1. Hardware Modifications for Boot in Debug Engineering Mode

  1. Connect a 1k...3.3k resistor between +3.3V and S4 pin 2 (S4.2). The closest +3.3V points are the following:

    • U8.1 = C18.2

    • R16.2 (the farthest pin from S4)

  2. Connect with a wire S4.2 to P2.1.

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