2020-06-05 00:11:22 +02:00
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Kontron SMARC-sAL28
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===================
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How to build it
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===============
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Configure Buildroot:
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$ make kontron_smarc_sal28_defconfig
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Change settings to fit your needs (optional):
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$ make menuconfig
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Compile everything and build the rootfs image:
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$ make
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Copying the image to a storage device
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=====================================
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Buildroot builds an image which can be written to the internal eMMC
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storage, a SD card or an USB thumb drive. You can use the following
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command on your host:
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$ sudo dd if=output/images/sdcard-emmc.img of=/dev/sdx bs=1M
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Where /dev/sdx is the corresponding block device of your SD card or USB
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thumb drive. To flash it on your internal eMMC use the following command on
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the board:
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# dd if=sdcard-emmc.img of=/dev/mmcblk1 bs=1M
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Be sure you have not booted from the internal eMMC in this case!
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Booting the board
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=================
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By default the bootloader will search for the first valid image, starting
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with the internal eMMC. Consult the vendor documentation on how to use the
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DIP switches to select specific boot devices. To use the bootloader
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environment set the boot_targets correspondingly. E.g.:
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# setenv boot_targets usb0
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To boot from an USB thumb drive.
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The device tree is loaded according to the filename in fdtfile. The
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following command will set the default device tree, which works on almost
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all variants (with less features of course):
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# setenv fdtfile freescale/fsl-ls1028a-kontron-sl28.dtb
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Set this to a device tree which fits your board variant.
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Connect your serial cable to SER1 and open your favorite terminal emulation
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program (baudrate 115200, 8n1). E.g.:
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$ picocom -b 115200 /dev/ttyUSB0
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You will get a warning reported by fdisk when you examine the SD card.
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This is because the genimage.cfg file doesn't specify the SD card size
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(as people will naturally have different sized cards), so the
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secondary GPT header is placed after the rootfs rather than at the end
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of the disk where it is expected to be.
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You will see something like this at boot time:
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[ 4.552797] GPT:Primary header thinks Alt. header is not at the end of the disk.
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[ 4.560237] GPT:266272 != 7864319
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[ 4.563565] GPT:Alternate GPT header not at the end of the disk.
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[ 4.569596] GPT:266272 != 7864319
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[ 4.572925] GPT: Use GNU Parted to correct GPT errors.
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2021-01-13 20:09:48 +01:00
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Updating the bootloader
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=======================
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Buildroot will automatically build the u-boot bootloader. The resulting
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image is called u-boot.rom and you can find it in the images/ directory.
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To update the bootloader on the board you could either copy it to an
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USB thumb drive or you could put it on a TFTP server. The following
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example assumes you have the bootloader image copied to the root of
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a thumb drive:
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# usb start
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# load usb 0:1 $loadaddr u-boot.rom
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# sf probe 0 && sf update $fileaddr 0x210000 $filesize
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