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- Update from original Marvell U-Boot to mainline U-Boot:
- -------------------------------------------------------
- Generate the U-Boot image with these commands:
- $ make clearfog_defconfig
- $ make
- The resulting image including the SPL binary with the
- full DDR setup is "u-boot-spl.kwb".
- Now all you need to do is copy this image on a SD card.
- For example with this command:
- $ sudo dd if=u-boot-spl.kwb of=/dev/sdX bs=512 seek=1
- Please use the correct device node for your setup instead
- of "/dev/sdX" here!
- Install U-Boot on eMMC:
- -----------------------
- The ROM loads the bootloader from eMMC first boot partition at offset 0. This
- is unlike load from SD card that is at offset 512. As a result, the offset of
- the main U-Boot image on the eMMC boot partition changes. Set
- CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR to 0x140 for SPL to load U-Boot from
- the correct location.
- To make SPL load the main U-Boot image from the eMMC boot partition enable
- eMMC boot acknowledgement and boot partition with the following U-Boot
- command:
- mmc partconf 0 1 1 0
- Install U-Boot on eMMC boot partition from Linux running on Clearfog:
- echo 0 > /sys/block/mmcblk0boot0/force_ro
- dd if=u-boot-spl.kwb of=/dev/mmcblk0boot0
- Note that the SD card is not accessible when the Clearfog SOM has eMMC.
- Consider initial boot from UART (see below).
- Install U-Boot on SATA:
- -----------------------
- When loading the main U-Boot image from raw SATA sector, set
- CONFIG_SPL_SATA_RAW_U_BOOT_SECTOR to 0x141.
- Boot selection:
- ---------------
- Before powering up the board, boot selection should be done via the SW1 dip
- switch (0: OFF, 1: ON):
- - SPI: 00010
- - SD/eMMC: 00111
- - M.2 SSD: 11100
- - UART: 01001 [1]
- [1]: According to SolidRun's manual, 11110 should be used for UART booting on
- the ClearFog 'Pro' variant.
- However, this doesn't work (anymore) at least on Rev. 2.1 (but '01001' as
- mentionend for the 'Base' variant does).
- Boot from UART:
- ---------------
- Connect the on-board micro-USB (CF Pro: CON11, CF Base: CON5)
- to your host.
- Set the SW1 DIP switches to UART boot (see above).
- Run the following command to initiate U-Boot download:
- ./tools/kwboot -b u-boot-spl.kwb /dev/ttyUSBX
- Use the correct UART device node for /dev/ttyUSBX.
- When download finishes start your favorite terminal emulator
- on /dev/ttyUSBX.
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