Kontron SMARC-sAL28, User Manual

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SMARC-sAL28 User Guide. Rev. 1.0
www.kontron.com // 45
7.2. Deploying created images to SD card or USB flash/disk and booting from it
Note: Kernel image, device tree images and kernel modules are automatically integrated into rootfs and sd/usb
images.
1. Attach installation media (SD card or USB flash/disk) to Linux host computer and determine a device node
by analyzing system logs:
dmesg | tail | grep sd
Note: an SD/USB storage should greater than 4 GB.
2. Extract a previously built SD/USB image from archive:
gunzip sal28-machine-test-kontron-sal28.wic.gz
Note: more information about WIC images can be found in official Yocto documentation:
https://www.yoctoproject.org/docs/2.5.3/dev-manual/dev-manual.html#creating-partitioned-images-using-wic
3. Deploy this image to SD/USB storage using a dd command. E.g.:
dd if=sal28-machine-test-kontron-sal28.wic of=/dev/sdb bs=4M oflag=direct
Note: all information on SD/USB storage will be erased!
4. Configure serial connection on SER1 port, then connect the installation media to SMARC-sAL28 and power
on/reset the board.
5. (Option #1: semi-automatic boot) When a U-Boot prompt will appear, a boot device and device tree should
be selected by setting following variables:
boot_targets, which can be set to:
 mmc0: to boot from SD;
 mmc1: to boot from eMMC;
 nvme0: to boot from NVMe disk;
 usb0: to boot from USB storage.
 carrier, which can be set to:
 ads2: if variant 3 or variant 4 with Kontron SMARC Evaluation Carrier 2.0 is used;
 s1914: if variant 3 or variant 4 with Kontron KBox A-230-LS Carrier is used;
 var2_on_ads2: if variant 2 on Kontron SMARC Evaluation Carrier 2.0 is used.
E.g. to boot variant 3 on Kontron SMARC Evaluation Carrier 2.0 from SD a following commands should be executed:
setenv boot_targets mmc0
setenv carrier ads2
run bootcmd
6. (Option #2: manual boot) Interrupt the boot process and check U-boot environment variables with
“printenv”. If needed, modify paths to kernel image and device tree table. E.g:
setenv image /Image
setenv fdt_file /sl28-var34-ads2.dtb
To boot the board, execute the following commands depending on which type of installation media is used:
 For USB flash/disk:
setenv bootargs root=/dev/sda2 rootwait default_hugepagesz=2m hugepagesz=2m hugepages=256 video=1920x1080
cma=256M
usb start
usb dev 0
fatload usb 0:1 ${fdt_addr_r} ${fdt_file}
fatload usb 0:1 ${kernel_addr_r} ${image}
run hdpload
booti ${kernel_addr_r} - ${fdt_addr_r}
 For SD card:
setenv bootargs root=/dev/mmcblk0p2 rootwait default_hugepagesz=2m hugepagesz=2m hugepages=256
video=1920x1080 cma=256M
mmc dev 0
fatload mmc 0:1 ${fdt_addr_r} ${fdt_file}
fatload mmc 0:1 ${kernel_addr_r} ${image}