$ make ARCH=arm CROSS_COMPILE=${CC} distclean

$ make ARCH=arm CROSS_COMPILE=${CC} smarcimx8mqsmarcimx8mp_2g4g_ser3_defconfig

$ make ARCH=arm CROSS_COMPILE=${CC}

Note1:

If the board is 2GB 4GB LPDDR4 in commercial or industrial temperature, use
$ make ARCH=arm CROSS_COMPILE=${CC} smarcimx8mqsmarcimx8mp_2g4g_ser3_defconfig

If the board is SMARC-iMX8M-Q-4G or SMARC-iMX8M-Q-4G-I (4GB LPDDR4)6GB LPDDR4, use
$ make ARCH=arm CROSS_COMPILE=${CC} smarcimx8mqsmarcimx8mp_4g6g_ser3_defconfig

Note 2:

"ser3" stands for console debug port in SMARC definition. 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:

To change the debug port, in addition to u-boot defconfig and uEnv.txt files, you also need to modify plat/imx/imx8m/imx8mqimx8mp/include/platform_def.h in mk in the imx-atf. Find "#define IMX_BOOT_UART_BASE U(0x30860000)BASE      ?=      0x30890000" and change to the correct address that defined in uEnv.txt file.

Note 4:

The SMARC-iMX8MiMX8MP module always boot up from the on-module eMMC flash. The factory default will be flash.bin pre-installed with SER3 as console output. In some cases when the eMMC flash is empty or needs to be upgraded. Users can shunt crossed the TEST# to ground. In this way, the SMARC-iMX8MiMX8MP module will boot up to carrier SD card, if TEST# pin is shunt crossed. The flash.bin image are the same, the difference is how you flash flash.bin. This will be explained in the "Setup SD card" section.

$ cp u-boot-nodtb.bin spl/u-boot-spl.bin arch/arm/dts/imx8mqimx8mp-smarc.dtb ../imx-mkimage/iMX8M/

$ cp tools/mkimage ../imx-mkimage/iMX8M/mkimage_uboot

optargs="video=HDMI-A-1:1920x1080-32@60 consoleblank=0"
#optargs="video=HDMI-A-1:3840x2160-32@30 consoleblank=0"
#optargs="video=HDMI-A-1:3840x2160-32@60 consoleblank=0"
#console port SER3
console=ttymxc0ttymxc1,115200 earlycon=ec_imx6q,0x308600000x30890000,115200
#console port SER2
#console=ttymxc1ttymxc2,115200 earlycon=ec_imx6q,0x308900000x30880000,115200
#console port SER1
#console=ttymxc2ttymxc3,115200 earlycon=ec_imx6q,0x308800000x30a60000,115200
#console port SER0
#console=ttymxc3ttymxc0,115200 earlycon=ec_imx6q,0x30A600000x30860000,115200
mmcdev=1
mmcpart=1
image=Image
loadaddr=0x40480000
fdt_addr=0x43000000
mmcroot=/dev/mmcblk1p2 rw
usbroot=/dev/sda2 rw
mmcrootfstype=ext4 rootwait fixrtc
netdev=eth0
ethact=FEC0
ipaddr=192.168.1.150
serverip=192.168.1.53
gatewayip=192.168.1.254
mmcargs=setenv bootargs cma=1280M console=${console} root=${mmcroot} rootfstype=${mmcrootfstype} ${optargs}
uenvcmd=run loadimage; run loadfdt; run mmcboot
# USB Boot
#usbargs=setenv bootargs console=${console} root=${usbroot} rootfstype=${mmcrootfstype} ${optargs}
#uenvcmd=run loadusbimage; run loadusbfdt; run usbboot

$ sudo cp -v arch/arm64/boot/Image /media/boot