FLEX-IMX8M-Mini HARDWARE MANUAL
– VER 1.00 – JAN 31 2020
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44
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5.13. Manufacturing and Boot Control
The FLEX-IMX8M-Mini has a number of pins to override the default boot media present on the FLEX-
IMX8M-Mini Compute Module or enable debug serial loader functionality.
Table 25 - Boot Selection Pins
PIN
Description
249
BOOT SELECT PIN
251
BOOT SELECT PIN
253
BOOT SELECT PIN
255
BOOT SELECT PIN
5.13.1. eMMC Boot Mode
The FLEX-IMX8M-Mini Compute Module automatically boot from the internal eMMC if the all control
signals keep floating or if the pins are connected as follow:
Table 25
– eMMC Boot Mode Configuration
PIN
Description
249
HIGH (3V3)
251
HIGH (3V3)
253
HIGH (3V3)
255
HIGH (3V3)
5.13.2. Serial Downloader Boot Mode
To boot the FLEX-IMX8M-Mini in Serial Download Mode. The boot signals need to be connected as
Table 26 - Serial Downloader Boot Mode Configuration
PIN
Description
249
Has no function while entering Serial Download Mode
251
Has no function while entering Serial Download Mode
253
LOW (GND)
255
LOW (GND)
NOTE : Pin 249 and Pin 251 are disregarded when Pin 253 and Pin 255 are set to perform Serial
Downloader boot mode.
5.13.3. SD Card Boot Mode
To boot the FLEX-IMX8M-Mini from a SD card on the baseboard. The boot signals need to be
connected as
Table 27 - SD Card Boot Mode Configuration
PIN
Description
249
LOW (GND)
251
LOW (GND)
253
HIGH (3V3)
255
HIGH (3V3)
