Note1:

If the board is SMARC-FiMX6-Q-2G or SMARC-FiMX6-D-2G, use
$ make ARCH=arm CROSS_COMPILE=${CC} smarcfimx6_quad_2g_ser3_config

 If the board is SMARC-FiMX6-Q-1G or SMARC-FiMX6-D-1G, use
$ make ARCH=arm CROSS_COMPILE=${CC} smarcfimx6_quad_1g_ser3_config

 If the board is SMARC-FiMX6-U-1G, use
$ make ARCH=arm CROSS_COMPILE=${CC} smarcfimx6_dl_1g_ser3_config

 If the board is SMARC-FiMX6-S, use
$ make ARCH=arm CROSS_COMPILE=${CC} smarcfimx6_solo_ser3_config

Note 2:

"ser3" stands for console debug port. In this example, we uses SER3 as debug port. If user uses SER0 as your debug port, make change to "ser0" instead. Same as SER1 and SER2.

Note 3:

The SMARC-FiMX6 module always boot up from the on-module SPI NOR flash. The factory default will be u-boot.imx pre-installed with SER3 as console output. In some cases when the SPI NOR flash is empty or needs to be upgraded. Users can shunt crossed the TEST# to ground. In this way, the SMARC-FiMX6 module will boot up to carrier SD card, if TEST# pin is shunt crossed. The u-boot.imx image are the same, the difference is how you flash u-boot.imx. This will be explained in the "Setup SD card" section.