1How to use and build U-Boot on mx6sabreauto
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4mx6sabreauto_defconfig target supports mx6q/mx6dl/mx6qp sabreauto variants.
5
6In order to build it:
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8$ make mx6sabreauto_defconfig
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10$ make
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12This will generate the SPL and u-boot.img binaries.
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14- Flash the SPL binary into the SD card:
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16$ sudo dd if=SPL of=/dev/sdX bs=1K seek=1 && sync
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18- Flash the u-boot.img binary into the SD card:
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20$ sudo dd if=u-boot.img of=/dev/sdX bs=1K seek=69 && sync
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22Booting via Falcon mode
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25Write in mx6sabreauto_defconfig the following define below:
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27CONFIG_SPL_OS_BOOT=y
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29In order to build it:
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31$ make mx6sabreauto_defconfig
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33$ make
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35This will generate the SPL image called SPL and the u-boot.img.
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37- Flash the SPL image into the SD card:
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39$ sudo dd if=SPL of=/dev/sdb bs=1K seek=1 && sync
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41- Flash the u-boot.img image into the SD card:
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43$ sudo dd if=u-boot.img of=/dev/sdb bs=1K seek=69 && sync
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45Create a FAT16 boot partition to store uImage and the dtb file, then copy the files there:
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47$ sudo cp uImage /media/boot
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49$ sudo cp imx6dl-sabreauto.dtb /media/boot
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51Create a partition for root file system and extract it there:
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53$ sudo tar xvf rootfs.tar.gz -C /media/root
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55The SD card must have enough space for raw "args" and "kernel".
56To configure Falcon mode for the first time, on U-Boot do the following commands:
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58- Load dtb file from boot partition:
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60# load mmc 0:1 ${fdt_addr} imx6dl-sabreauto.dtb
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62- Load kernel image from boot partition:
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64# load mmc 0:1 ${loadaddr} uImage
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66- Write kernel at 2MB offset:
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68# mmc write ${loadaddr} 0x1000 0x4000
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70- Setup kernel bootargs:
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72# setenv bootargs "console=ttymxc3,115200 root=/dev/mmcblk0p1 rootfstype=ext4 rootwait quiet rw"
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74- Prepare args:
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76# spl export fdt ${loadaddr} - ${fdt_addr}
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78- Write args 1MB data (0x800 sectors) to 1MB offset (0x800 sectors)
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80# mmc write 18000000 0x800 0x800
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82- Restart the board and then SPL binary will launch the kernel directly.
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