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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, as described in the following section.
1. Selecting Boot Device on STM32MP1-BSB
Selection of a specific boot device is defined by the state of the switches on the SOMSTM32MP1-BSB development board, as follows:
JP10. |
0 |
JP10. |
1 |
JP10. |
2 |
Boot from SD Card |
ON |
ON | ON |
Boot from on-module eMMC |
OFF |
OFF | OFF |
Boot from USB Serial Downloader |
-
OFF |
OFF
ON | OFF |
ON
ON
Hardware Modifications for Boot in Debug Engineering Mode
...
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)
...
State ON means presence of a jumper on the corresponding pin of the JP10 header; state OFF means absence of a jumper.
By default, the Starter Kit is configured to boot the default Linux configuration from the on-module eMMC. You can override this configuration by modifying the set of the switches on the SOMSTM32MP1-BSB, as described above.
Refer to the following additional information on how to boot from the various devices:
Booting Linux from eMMCBooting from USB Serial Downloader .