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5.3. Boot Mode
The device has four boot modes (one is reserved for NXP use).
Table 9: Boot mode pin settings
BOOT_MODE[1:0]
00
01
10
11
BOOT_MODE[1:0] pins have internal pull-downs. By default, these pins can be left floating to stay in "Boot from Fuses"
mode. In this mode the SoM boots as programmed by Kontron.
5.3.1.
SD/MMC manufacture mode
If no valid boot image is found on the programmed boot devices the SoM switches to SD/MMC manufacture mode
before the serial download mode. In the manufacture mode, the SD or MMC card will be scanned on the uSDHC1. If a
card is detected and a valid boot image is found in the card, the boot image is loaded and executed. Pad 49 of the SoM
acts as SD1_CD and is used to detect whether a card is inserted or not.
5.3.2.
Serial Downloader
The Serial Downloader provides a means to download a program image to the chip over the USB OTG1 or UART 1/2
serial connection.
It is recommended to have the boot pins and the OTG1 pins available on
the baseboard to recover the SoM in case of a broken image. In
addition, also the SD1 pins including the SD1_CD pin and the pins for
the Linux console can be useful.
www.kontron-electronics.de
Boot Type
Boot From Fuses
Serial Downloader
Internal Boot
Reserved
SL iMX6UL/ULL - Rev. 0.4
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