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Update from original Marvell U-Boot to mainline U-Boot:
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-------------------------------------------------------
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Generate the U-Boot image with these commands:
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$ make clearfog_defconfig
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$ make
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The resulting image including the SPL binary with the
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full DDR setup is "u-boot-spl.kwb".
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Now all you need to do is copy this image on a SD card.
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For example with this command:
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$ sudo dd if=u-boot-spl.kwb of=/dev/sdX bs=512 seek=1
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Please use the correct device node for your setup instead
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of "/dev/sdX" here!
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Boot selection:
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---------------
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Before powering up the board, boot selection should be done via the SW1 dip
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switch (0: OFF, 1: ON):
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- SPI: 00010
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- SD/eMMC: 00111
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- M.2 SSD: 11100
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- UART: 01001 [1]
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[1]: According to SolidRun's manual, 11110 should be used for UART booting on
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the ClearFog 'Pro' variant.
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However, this doesn't work (anymore) at least on Rev. 2.1 (but '01001' as
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mentionend for the 'Base' variant does).
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Boot from UART:
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---------------
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Connect the on-board micro-USB (CF Pro: CON11, CF Base: CON5)
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to your host.
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Set the SW1 DIP switches to UART boot (see above).
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Run the following command to initiate U-Boot download:
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./tools/kwboot -b u-boot-spl.kwb /dev/ttyUSBX
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Use the correct UART device node for /dev/ttyUSBX.
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When download finishes start your favorite terminal emulator
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on /dev/ttyUSBX.
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