1Update from original Marvell U-Boot to mainline U-Boot: 2------------------------------------------------------- 3 4Generate the U-Boot image with these commands: 5 6$ make clearfog_defconfig 7$ make 8 9The resulting image including the SPL binary with the 10full DDR setup is "u-boot-spl.kwb". 11 12Now all you need to do is copy this image on a SD card. 13For example with this command: 14 15$ sudo dd if=u-boot-spl.kwb of=/dev/sdX bs=512 seek=1 16 17Please use the correct device node for your setup instead 18of "/dev/sdX" here! 19 20Install U-Boot on eMMC: 21----------------------- 22 23The ROM loads the bootloader from eMMC first boot partition at offset 0. This 24is unlike load from SD card that is at offset 512. As a result, the offset of 25the main U-Boot image on the eMMC boot partition changes. Set 26CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR to 0x140 for SPL to load U-Boot from 27the correct location. 28 29To make SPL load the main U-Boot image from the eMMC boot partition enable 30eMMC boot acknowledgement and boot partition with the following U-Boot 31command: 32 33 mmc partconf 0 1 1 0 34 35Install U-Boot on eMMC boot partition from Linux running on Clearfog: 36 37 echo 0 > /sys/block/mmcblk0boot0/force_ro 38 dd if=u-boot-spl.kwb of=/dev/mmcblk0boot0 39 40Note that the SD card is not accessible when the Clearfog SOM has eMMC. 41Consider initial boot from UART (see below). 42 43Install U-Boot on SATA: 44----------------------- 45 46When loading the main U-Boot image from raw SATA sector, set 47CONFIG_SPL_SATA_RAW_U_BOOT_SECTOR to 0x141. 48 49Boot selection: 50--------------- 51 52Before powering up the board, boot selection should be done via the SW1 dip 53switch (0: OFF, 1: ON): 54 55 - SPI: 00010 56 - SD/eMMC: 00111 57 - M.2 SSD: 11100 58 - UART: 01001 [1] 59 60[1]: According to SolidRun's manual, 11110 should be used for UART booting on 61 the ClearFog 'Pro' variant. 62 However, this doesn't work (anymore) at least on Rev. 2.1 (but '01001' as 63 mentionend for the 'Base' variant does). 64 65Boot from UART: 66--------------- 67 68Connect the on-board micro-USB (CF Pro: CON11, CF Base: CON5) 69to your host. 70 71Set the SW1 DIP switches to UART boot (see above). 72 73Run the following command to initiate U-Boot download: 74 75 ./tools/kwboot -b u-boot-spl.kwb /dev/ttyUSBX 76 77Use the correct UART device node for /dev/ttyUSBX. 78 79When download finishes start your favorite terminal emulator 80on /dev/ttyUSBX. 81