The Emcraft STM32MP1 Starter Kit supports several boot devices. 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 |
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)
- Connect with a wire S4.2 to P2.1.
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 SOM-BSB, as described above.
Refer to the following additional information on how to boot from the various devices:
|
